HP 5500 Ei 5500 Si Switch Series Configuration Guide
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[DeviceB] interface gigabitethernet 1/0/2
[DeviceB-GigabitEthernet1/0/2] port link-type trunk
[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan all
# Enable MVRP on port GigabitEthernet1/0/2.
[DeviceB-GigabitEthernet1/0/2] mvrp enable
[DeviceB-GigabitEthernet1/0/2] quit
# Configure port GigabitEthernet 1/0/3 as a trunk port, and configure it to permit all VLANs.
[DeviceB] interface gigabitethernet 1/0/3
[DeviceB-GigabitEthernet1/0/3] port link-type trunk
[DeviceB-GigabitEthernet1/0/3]...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-465.png "Page 466
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[DeviceB] interface gigabitethernet 1/0/2
[DeviceB-GigabitEthernet1/0/2] port link-type trunk
[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan all
# Enable MVRP on port GigabitEthernet1/0/2.
[DeviceB-GigabitEthernet1/0/2] mvrp enable
[DeviceB-GigabitEthernet1/0/2] quit
# Configure port GigabitEthernet 1/0/3 as a trunk port, and configure it to permit all VLANs.
[DeviceB] interface gigabitethernet 1/0/3
[DeviceB-GigabitEthernet1/0/3] port link-type trunk
[DeviceB-GigabitEthernet1/0/3]...")
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# Enable MVRP on port GigabitEthernet1/0/2.
[DeviceC-GigabitEthernet1/0/2] mvrp enable
[DeviceC-GigabitEthernet1/0/2] quit
Configure Device D:
# Enter MST region view.
system-view
[DeviceD] stp region-configuration
# Configure the MST region name, VLAN-to-instance mappings, and revision level.
[DeviceD-mst-region] region-name example
[DeviceD-mst-region] instance 1 vlan 10
[DeviceD-mst-region] instance 2 vlan 20
[DeviceD-mst-region] revision-level 0
# Manually activate the MST region...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-466.png "Page 467
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# Enable MVRP on port GigabitEthernet1/0/2.
[DeviceC-GigabitEthernet1/0/2] mvrp enable
[DeviceC-GigabitEthernet1/0/2] quit
Configure Device D:
# Enter MST region view.
system-view
[DeviceD] stp region-configuration
# Configure the MST region name, VLAN-to-instance mappings, and revision level.
[DeviceD-mst-region] region-name example
[DeviceD-mst-region] instance 1 vlan 10
[DeviceD-mst-region] instance 2 vlan 20
[DeviceD-mst-region] revision-level 0
# Manually activate the MST region...")
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----[GigabitEthernet1/0/1]----
Config Status : Enabled
Running Status : Enabled
Join Timer : 20 (centiseconds)
Leave Timer : 60 (centiseconds)
Periodic Timer : 100 (centiseconds)
LeaveAll Timer : 1000 (centiseconds)
Registration Type : Normal
Local VLANs :
1(default),
----[GigabitEthernet1/0/2]----
Config Status...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-467.png "Page 468
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----[GigabitEthernet1/0/1]----
Config Status : Enabled
Running Status : Enabled
Join Timer : 20 (centiseconds)
Leave Timer : 60 (centiseconds)
Periodic Timer : 100 (centiseconds)
LeaveAll Timer : 1000 (centiseconds)
Registration Type : Normal
Local VLANs :
1(default),
----[GigabitEthernet1/0/2]----
Config Status...")
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Periodic Timer : 100 (centiseconds)
LeaveAll Timer : 1000 (centiseconds)
Registration Type : Normal
Local VLANs :
1(default),
----[GigabitEthernet1/0/2]----
Config Status : Enabled
Running Status : Enabled
Join Timer : 20 (centiseconds)
Leave Timer : 60 (centiseconds)
Periodic Timer : 100 (centiseconds)...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-468.png "Page 469
258
Periodic Timer : 100 (centiseconds)
LeaveAll Timer : 1000 (centiseconds)
Registration Type : Normal
Local VLANs :
1(default),
----[GigabitEthernet1/0/2]----
Config Status : Enabled
Running Status : Enabled
Join Timer : 20 (centiseconds)
Leave Timer : 60 (centiseconds)
Periodic Timer : 100 (centiseconds)...")
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----[GigabitEthernet1/0/2]----
Config Status : Enabled
Running Status : Enabled
Join Timer : 20 (centiseconds)
Leave Timer : 60 (centiseconds)
Periodic Timer : 100 (centiseconds)
LeaveAll Timer : 1000 (centiseconds)
Registration Type : Normal
Local VLANs :
1(default), 20,
The output shows that:
{ Port GigabitEthernet 1/0/1...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-469.png "Page 470
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----[GigabitEthernet1/0/2]----
Config Status : Enabled
Running Status : Enabled
Join Timer : 20 (centiseconds)
Leave Timer : 60 (centiseconds)
Periodic Timer : 100 (centiseconds)
LeaveAll Timer : 1000 (centiseconds)
Registration Type : Normal
Local VLANs :
1(default), 20,
The output shows that:
{ Port GigabitEthernet 1/0/1...")
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2.
Change the registration mode and verify the configuration:
Set the MVRP registration mode to fixed on Gi gabitEthernet 1/0/3 of Device B, so that the
dynamic VLANs that Device B learns in VLAN 1 are not de-registered.
# Set the MVRP registration mode to fixed on GigabitEthernet 1/0/3.
[DeviceB] interface gigabitethernet 1/0/3
[DeviceB-GigabitEthernet1/0/3] mvrp registration fixed
[DeviceB-GigabitEthernet1/0/3] quit
# Display the local MVRP VLAN information on GigabitEthernet 1/0/3....](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-470.png "Page 471
260
2.
Change the registration mode and verify the configuration:
Set the MVRP registration mode to fixed on Gi gabitEthernet 1/0/3 of Device B, so that the
dynamic VLANs that Device B learns in VLAN 1 are not de-registered.
# Set the MVRP registration mode to fixed on GigabitEthernet 1/0/3.
[DeviceB] interface gigabitethernet 1/0/3
[DeviceB-GigabitEthernet1/0/3] mvrp registration fixed
[DeviceB-GigabitEthernet1/0/3] quit
# Display the local MVRP VLAN information on GigabitEthernet 1/0/3....")
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Contents
Configuring ARP ··················\
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260 2. Change the registration mode and verify the configuration: Set the MVRP registration mode to fixed on Gi gabitEthernet 1/0/3 of Device B, so that the dynamic VLANs that Device B learns in VLAN 1 are not de-registered. # Set the MVRP registration mode to fixed on GigabitEthernet 1/0/3. [DeviceB] interface gigabitethernet 1/0/3 [DeviceB-GigabitEthernet1/0/3] mvrp registration fixed [DeviceB-GigabitEthernet1/0/3] quit # Display the local MVRP VLAN information on GigabitEthernet 1/0/3. [DeviceB] display mvrp running-status interface gigabitethernet 1/0/3 -------[MVRP Global Info]------- Global Status : Enabled Compliance-GVRP : False ----[GigabitEthernet1/0/3]---- Config Status : Enabled Running Status : Enabled Join Timer : 20 (centiseconds) Leave Timer : 60 (centiseconds) Periodic Timer : 100 (centiseconds) LeaveAll Timer : 1000 (centiseconds) Registration Type : Fixed Local VLANs : 1(default), 10, The output shows that the VLAN information on GigabitEthernet 1/0/3 is not changed after you set the MVRP registration mode to fixed on GigabitEthernet 1/0/3. # Delete VLAN 10 on Device A. [DeviceA] undo vlan 10 # Display the local MVRP VLAN information on GigabitEthernet 1/0/3. [DeviceB] display mvrp running-status interface gigabitethernet 1/0/3 -------[MVRP Global Info]------- Global Status : Enabled Compliance-GVRP : False ----[GigabitEthernet1/0/3]---- Config Status : Enabled Running Status : Enabled Join Timer : 20 (centiseconds) Leave Timer : 60 (centiseconds) Periodic Timer : 100 (centiseconds) LeaveAll Timer : 1000 (centiseconds) Registration Type : Fixed Local VLANs : 1(default), 10, The output shows that the dynamic VLAN inform ation on GigabitEthernet 1/0/3 is not changed after you set the MVRP registration mode to fixed on GigabitEthernet 1/0/3.
261 Index A B C D E G I L M O P Q R S V A Assigning a port to the isolation group,58 B BP DU tunneling configuration examples, 113 C C onfiguration example for MVRP in normal registration mode, 252 C onfiguration guidelines, 21 C onfiguration prerequisites, 248 C onfiguration prerequisites, 15 6 C onfiguration procedure,21 C onfiguration procedure,14 2 C onfiguration procedure,14 8 C onfiguration procedure,242 Co nfiguration restrictions and guidelines, 39 Co nfiguration restrictions and guidelines, 14 8 Co nfiguration restrictions and guidelines, 242 C onfiguring a Layer 2 Ethernet interface, 7 C onfiguring a loopback interface, 18 C onfiguring a null interface, 19 C onfiguring a port to operate in automatic voice VLAN assignment mode, 15 7 C onfiguring a port to operate in manual voice VLAN assignment mode, 15 8 C onfiguring an aggregate interface, 43 C onfiguring an aggregation group, 39 C onfiguring an MST region, 78 Co nfiguring basic QinQ, 18 0 C onfiguring basic settings of a VLAN interface,1 19 C onfiguring basic VLAN settings, 118 C onfiguring CDP compatibility, 231 C onfiguring destination multicast MAC address for BPDUs, 112 C onfiguring Digest Snooping, 92 C onfiguring edge ports, 84 C onfiguring GVRP functions, 16 8 Co nfiguring IP subnet-based VLANs, 13 8 C onfiguring LLDP to advertise a specific voice VLAN, 233 C onfiguring LLDP trapping, 235 C onfiguring load sharing for link aggregation groups, 47 C onfiguring MAC Information, 30 C onfiguring MAC-based VLANs,12 7 C onfiguring many-to-one VLAN mapping, 206 Co nfiguring MRP timers, 250 C onfiguring No Agreement Check,94 C onfiguring one-to-one VLAN mapping, 204 C onfiguring path costs of ports, 85 Co nfiguring port-based VLANs, 121 C onfiguring protection functions, 98 C onfiguring protocol-based VLANs, 13 4 C onfiguring QoS priority settings for voice traffic on an interface, 15 7 C onfiguring selective QinQ, 181 C onfiguring spanning tree timers, 82 C onfiguring static, dynamic, and blackhole MAC address table entries, 23 C onfiguring TC snooping, 96 C onfiguring the aging timer for dynamic MAC address entries, 25 C onfiguring the device priority,80 C onfiguring the GARP timers, 16 9 C onfiguring the maximum hops of an MST region,81 C onfiguring the maximum port rate, 84 C onfiguring the mode a port uses to recognize/send MSTP packets, 89 C onfiguring the MVRP registration mode, 249 C onfiguring the network diameter of a switched network, 81 C onfiguring the port link type, 88 C onfiguring the port priority, 88 C onfiguring the root bridge or a secondary root bridge, 79 C onfiguring the timeout factor, 83 C onfiguring the TPID value in VLAN tags, 18 5
262 Configuring two-to-two VLAN mapping,208 D Disa bling MAC address learning, 24 Displa ying and maintaining an Ethernet interface,17 Displa ying and maintaining Ethernet link aggregation, 50 Displa ying and maintaining GVRP, 17 0 Displa ying and maintaining isolate-user-VLAN, 14 9 Displa ying and maintaining LLDP, 235 Displa ying and maintaining loopback and null interfaces, 19 Displa ying and maintaining MAC address tables, 28 Displa ying and maintaining MVRP, 251 Displa ying and maintaining service loopback groups, 243 Displa ying and maintaining super VLAN, 14 4 Displa ying and maintaining the isolation group, 58 Displa ying and maintaining the spanning tree, 101 Displa ying and maintaining VLAN, 141 Displa ying and maintaining voice VLAN, 15 9 Dy namically advertising server-assigned VLANs through LLDP, 235 E Ena bling BPDU tunneling, 111 Ena bling GVRP compatibility, 251 Ena bling link-aggregation traffic redirection, 49 E nabling LLDP to automatically discover IP phones, 232 Ena bling MVRP, 248 Ena bling outputting port state transition information, 90 Ena bling the spanning tree feature, 90 Ether net interface naming conventions, 1 Ether net link aggregation configuration examples, 50 Ether net link aggregation configuration task list, 39 G G VRP configuration examples, 17 0 G VRP configuration task list, 16 7 I Isolat e-user-VLAN configuration example, 15 0 L LLD P configuration examples, 236 LLD P configuration task list, 226 M MA C address table configuration example, 28 MA C Information configuration example, 32 MS TP, 68 M VRP configuration task list, 248 O Ov erview(Configuring an isolate-user-VLAN),14 7 Ov erview(Configuring MAC Information), 30 Ov erview(Configuring a service loopback group (available only on the 5500 EI)), 241 Ov erview(Configuring GVRP), 16 4 Ov erview(Configuring LLDP), 221 Ov erview(Configuring MVRP), 245 Ov erview(Configuring a voice VLAN), 15 3 Ov erview(Configuring the MAC address table),22 Ov erview(Configuring QinQ), 176 Ov erview(Configuring BPDU tunneling), 10 9 Ov erview(Configuring VLANs), 116 Ov erview(Configuring Ethernet link aggregation), 33 Ov erview(Configuring VLAN mapping (available only on the 5500 EI)), 19 9 Ov erview(Configuring a super VLAN (available only on the 5500 EI)), 14 2 P P erforming basic LLDP configuration, 227 P erforming general configurations, 1 P erforming mCheck, 91 P ort isolation configuration example, 59 Pr otocols and standards, 73 PVS T, 67 Q QinQ conf iguration examples, 18 6 QinQ conf iguration task list, 17 9 R RS TP, 67 S S ervice loopback group configuration example, 243 S etting the MTU for a Layer 3 Ethernet interface (available only on the 5500 EI), 16 S etting the spanning tree mode, 77 S panning tree configuration examples, 10 2 S panning tree configuration task list, 73
263 STP,60 Super VL AN configuration example, 14 4 V VL AN mapping configuration examples, 212 VL AN mapping configuration tasks, 203 V oice VLAN configuration examples, 15 9
i Contents Configuring ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ·········· 1 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ········· 1 ARP message format ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ 1 ARP operation ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ··················\ ······ 2 ARP table ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ··················\ ·········· 3 Configuring a static ARP entry ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 3 Configuring the maximum number of dynamic ARP entries for an interface ··················\ ··················\ ··················\ ········ 4 Setting the aging timer for dynamic ARP entries ··················\ ··················\ ··················\ ··················\ ······· ··················\ ·········· 4 Enabling dynamic ARP entry check ··················\ ··················\ ··················\ ··················\ ··················\ ···· ··················\ ················ 5 Configuring ARP quick update ··················\ ··················\ ··················\ ··················\ ··················\ ········ ··················\ ··················\ ·· 5 Configuring multicast ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ··················\ ······· 6 Displaying and maintaining ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······· 6 ARP configuration examples ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ··················\ ···· 7 Static ARP entry configuration example ··················\ ··················\ ··················\ ··················\ ················ ··················\ ······· 7 Multicast ARP configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ········· 8 Configuring gratuitous ARP ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ················· 11 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 11 Gratuitous ARP packet learning ··················\ ··················\ ··················\ ··················\ ··················\ ······ ··················\ ········· 11 Periodic sending of gr atuitous ARP packets ··················\ ··················\ ··················\ ··················\ ············ ··················\ · 11 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ··················\ ····· 12 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ···· 12 Configuring proxy ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ··················\ · 13 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 13 Common proxy ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·· ··················\ ·············· 13 Local proxy ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ···· 13 Enabling common proxy ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ················ 14 Enabling local proxy ARP··················\ ··················\ ··················\ ··················\ ··················\ ·······························\ ··················\ ··· 14 Displaying and maintaining proxy ARP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 15 Proxy ARP configuration examples ··················\ ··················\ ··················\ ··················\ ··················\ ···· ··················\ ·············· 15 Common proxy ARP conf iguration example ··················\ ··················\ ··················\ ··················\ ················ ·············· 15 Local proxy ARP configuration exampl e in case of port isolation ··················\ ··················\ ··················\ ········· ···· 16 Local proxy ARP configuration example in supe r VLAN(only available on the HP 5500 EI) ··················\ ····· 17 Local proxy ARP configuration example in isolate-user-VLAN ··················\ ··················\ ··················\ ··················\ ·· 18 Configuring ARP snooping ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ················ 21 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 21 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ···· 21 Displaying and maintaining ARP snooping ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ······· 21 Configuring IP addressing ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ··················\ 22 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 22 IP address classes ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·· 22 Special IP addresses ··················\ ··················\ ··················\ ··················\ ··················\ ················ ··················\ ················· 23 Subnetting and masking ··················\ ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ············· 23 Assigning an IP addre ss to an interface ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ············· 24 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 24 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 24 Configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ·············· 24 Configuring IP unnumbered(only av ailable on the HP 5500 EI) ··················\ ··················\ ··················\ ············· ··········· 26
ii Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····························\ ··················\ ······ 26 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 26 Configuration prerequisites ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············· 26 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 27 Displaying and mainta ining IP addressing ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ········· 27 DHCP overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ··················\ ····· 28 DHCP address allocation ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ··· 28 Dynamic IP address allocation process··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··· 29 IP address leas e extension··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ············· 29 DHCP message format ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ·· 30 DHCP options ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ························\ ··················\ ··········· 31 Common DHCP options ··················\ ··················\ ··················\ ··················\ ··················\ ················· ··················\ ··········· 31 Custom options ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···· ··················\ ··················\ ·· 31 Protocols and standards ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ····· 35 Configuring DHCP server ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ················· 36 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 36 DHCP address pool ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ················· 36 IP address allocation sequence ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ················ 37 DHCP server configuration task list ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ ················· 38 Configuring an address pool for the DHCP server ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 38 Configuration task list ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ 38 Creating a DHCP address pool ··················\ ··················\ ··················\ ··················\ ··················\ ········ ··················\ ······· 39 Configuring address allocation mode for a common address pool ··················\ ··················\ ··················\ ·········· 39 Configuring dynamic address allocation for an extended address pool ··················\ ··················\ ··················\ ·· 41 Configuring a domain name suffix for the client ··················\ ··················\ ··················\ ··················\ ······· ················ 42 Configuring DNS server s for the client ··················\ ··················\ ··················\ ··················\ ················ ··················\ ····· 42 Configuring WINS servers and NetB IOS node type for the client ··················\ ··················\ ··················\ ··········· · 42 Configuring BIMS server in formation for the client ··················\ ··················\ ··················\ ··················\ ··················\ ·· 43 Configuring gateways for the client ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ ······· 43 Configuring Option 184 parameters fo r the client with voice service ··················\ ··················\ ··················\ ····· · 44 Configuring the TFTP server and bootfile name for the client ··················\ ··················\ ··················\ ··················\ ··· 44 Specifying a server’s IP address for the DHCP client ··················\ ··················\ ··················\ ··················\ ·· ·············· 45 Configuring self-defin ed DHCP options ··················\ ··················\ ··················\ ··················\ ················· ··················\ ··· 45 Enabling DHCP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ··················\ ········· 46 Enabling the DHCP server on an interface ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······ 46 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 46 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 47 Applying an extended addre ss pool on an interface ··················\ ··················\ ··················\ ··················\ ····· ··················\ · 47 Configuring the DHCP serv er security functions ··················\ ··················\ ··················\ ··················\ ········ ··················\ ······· 48 Configuration prerequisites ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············· 48 Enabling unauthorized DH CP server detection ··················\ ··················\ ··················\ ··················\ ··········· ··············· 48 Configuring IP address conflict detection ··················\ ··················\ ··················\ ··················\ ············· ··················\ ···· 48 Enabling client offline detection ··················\ ··················\ ··················\ ··················\ ··················\ ··· ··················\ ··················\ ·· 49 Enabling handling of Option 82 ··················\ ··················\ ··················\ ··················\ ··················\ ······ ··················\ ················ 49 Configuration prerequisites ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············· 49 Enabling Option 82 handling ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ 49 Specifying the threshold for sending trap messages ··················\ ··················\ ··················\ ··················\ ···· ··················\ ···· 50 Configuration prerequisites ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············· 50 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 50 Setting the DSCP valu e for DHCP packets ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ········· 50 Displaying and maintain ing the DHCP server ··················\ ··················\ ··················\ ··················\ ············ ··················\ ······ 50 DHCP server configuration examples ··················\ ··················\ ··················\ ··················\ ··················\ ·· ··················\ ············ 51 Static IP address assignme nt configuration example··················\ ··················\ ··················\ ··················\ ····· ············ 51
iii Dynamic IP address assignment configuration example ··················\ ··················\ ··················\ ··················\ ··· ········ 53 Self-defined option co nfiguration example ··················\ ··················\ ··················\ ··················\ ············· ··················\ ·· 54 Troubleshooting DHCP se rver configuration ··················\ ··················\ ··················\ ··················\ ············· ··················\ ········ 55 Symptom ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ················ 55 Analysis ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····························\ ··················\ ········ 55 Solution ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ 55 Configuring DHCP relay agent ·················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············· 56 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 56 Fundamentals ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ························\ ··················\ ··· 56 DHCP relay agent suppo rt for Option 82 ··················\ ··················\ ··················\ ··················\ ················ ··················\ 57 DHCP relay agent config uration task list ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ············· 58 Enabling DHCP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ··················\ ········· 58 Enabling the DHCP relay ag ent on an interface ··················\ ··················\ ··················\ ··················\ ········· ··················\ ····· 58 Correlating a DHCP server group with a relay agent interface··················\ ··················\ ··················\ ············· ············· 59 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 59 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 59 Configuring the DHCP relay agent security functions ··················\ ··················\ ··················\ ··················\ ··· ··················\ ··· 60 Configuring a ddress check ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ··········· 60 Configuring periodic refresh of dynamic client entries ··················\ ··················\ ··················\ ··················\ ············· 60 Enabling unauthorized DH CP server detection ··················\ ··················\ ··················\ ··················\ ··········· ··············· 61 Enabling DHCP starvation attack protection ··················\ ··················\ ··················\ ··················\ ············ ··················\ 61 Enabling offline detection ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ················ 62 Configuring the DHCP relay agent to release an IP address ··················\ ··················\ ··················\ ··············· ··············· 62 Configuring the DHCP relay agent to support Option 82 ··················\ ··················\ ··················\ ··················\ ················· 63 Configuration prerequisites ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············· 63 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 63 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 63 Setting the DSCP valu e for DHCP packets ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ········· 64 Displaying and maintainin g the DHCP relay agent ··················\ ··················\ ··················\ ··················\ ······· ··················\ ·· 64 DHCP relay agent conf iguration examples ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ········ 65 DHCP relay agent conf iguration example ··················\ ··················\ ··················\ ··················\ ················ ··················\ 65 DHCP relay agent Op tion 82 support configuration example ··················\ ··················\ ··················\ ··················\ · 66 Troubleshooting DHCP relay agent configuration ··················\ ··················\ ··················\ ··················\ ········ ··················\ ···· 67 Symptom ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ················ 67 Analysis ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····························\ ··················\ ········ 67 Solution ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ 67 Configuring DHCP client ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ 68 Configuration restrictions ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ··················\ ······ 68 Enabling the DHCP client on an interface ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ··········· 68 Setting the DSCP valu e for DHCP packets ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ········· 68 Displaying and maintaining the DHCP client ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·· 69 DHCP client configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ··· ··················\ ·············· 69 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ············· 69 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 69 Verifying the configuration ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ·············· 70 Configuring DHCP snooping ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······· 71 DHCP snooping functions ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ················ 71 Ensuring that DHCP clients obtain IP addresses from authorized DHCP servers ··················\ ··················\ ········ 71 Recording IP-to-MAC mappin gs of DHCP clients ··················\ ··················\ ··················\ ··················\ ·········· ············· 71 Application environmen t of trusted ports ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ············· 72 Configuring a trusted port connected to a DHCP server ··················\ ··················\ ··················\ ··················\ ··········· 72 Configuring trusted ports in a cascaded network ··················\ ··················\ ··················\ ··················\ ······· ··················\ ····· 72 DHCP snooping support for Option 82 ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 73
iv DHCP snooping configuration task list ··················\ ··················\ ··················\ ··················\ ················· ··················\ ············· 74 Configuring DHCP snooping basic functions ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·· 75 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 75 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 75 Configuring DHCP snooping to support Option 82 ··················\ ··················\ ··················\ ··················\ ··················\ ········· 76 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 76 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 76 Configuring DHCP snoop ing entries backup ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ······ 77 Enabling DHCP starvation attack protection ··················\ ··················\ ··················\ ··················\ ············ ··················\ ········· 78 Enabling DHCP-REQUEST messa ge attack protection ··················\ ··················\ ··················\ ··················\ ······· ················ 79 Configuring DHCP packet rate limit ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ················· 79 Configuration guidelines ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ·············· 79 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 79 Displaying and mainta ining DHCP snooping ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ····· 80 DHCP snooping configuration examples ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ········· 80 DHCP snooping configuration example ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ 80 DHCP snooping Option 82 suppo rt configuration example ··················\ ··················\ ··················\ ··················\ · ··· 81 Configuring BOOTP clie nt ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ················· 83 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 83 BOOTP application ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ················ 83 Obtaining an IP address dynamically ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····· 83 Protocols and standards ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ·············· 83 Configuration restrictions ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ··················\ ······ 83 Configuring an interface to dynamically obtain an IP address through BOOTP ··················\ ··················\ ················ 84 Displaying and maintaining BOOTP client configuration ··················\ ··················\ ··················\ ··················\ ··················\ 84 BOOTP client configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ·· ··················\ ············ 84 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ············· 84 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 84 Configuring IPv4 DNS ·················\ ··················\ ··················\ ··················\ ··················\ ················· ··················\ ··················\ · 85 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 85 Static domain name resolution ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ················· 85 Dynamic domain name resolution ··················\ ··················\ ··················\ ··················\ ··················\ ······ ··················\ ····· 85 DNS proxy ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ··················\ ···· 86 DNS spoofing ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······ ··················\ ··················\ ·· 87 Configuring the IPv4 DNS client ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ················· 88 Configuring static doma in name resolution ··················\ ··················\ ··················\ ··················\ ··················\ ·············· 88 Configuring dynamic domain name resolution ··················\ ··················\ ··················\ ··················\ ············ ·············· 88 Configuring th e DNS proxy ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ··················\ · 89 Configuring DNS spoofing ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ··················\ · 90 Setting the DSCP value for DNS packets ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ········· 90 Specifying the source interface for DNS packets ··················\ ··················\ ··················\ ··················\ ······· ··················\ ······ 90 Displaying and main taining IPv4 DNS ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ ··········· 91 Static domain name resolution configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ···· 91 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ············· 91 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 91 Dynamic domain name resolution configuration example ··················\ ··················\ ··················\ ··················\ ·· ·············· 92 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ············· 92 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 93 Verifying the configuration ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ·············· 95 DNS proxy configur ation example ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ············· 95 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ············· 95 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············· 96 Verifying the configuration ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ·············· 96
v Troubleshooting IPv4 DNS configuration ··················\ ··················\ ··················\ ··················\ ················ ··················\ ·········· 97 Symptom ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ················ 97 Solution ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ 97 Configuring IRDP ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·· ··················\ ··················\ ······ 98 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ······ 98 Background ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··························\ ··················\ ···· 98 Working mechanism ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ ·············· 98 Concepts··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ··················\ ······ 99 Protocols and standards ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ·············· 99 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ···· 99 IRDP configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ··················\ 100 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 100 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 101 Verifying the configuration ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············ 102 Configuring IP perfor mance optimization ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ···· 103 Enabling receiving and forwarding of directed broadcasts to a directly connected network ··················\ ··········· 103 Enabling receiving of directed broadcas ts to a directly connected network ··················\ ··················\ ············ 103 Enabling forwarding of directed broadcasts to a directly connected network ··················\ ··················\ ········· 103 Configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ············ 104 Configuring TCP attributes ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ··················\ ·· 104 Configuring TCP path MTU discovery ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··· 104 Configuring the TCP send/receive buffer size ··················\ ··················\ ··················\ ··················\ ·········· ··············· 105 Configuring TC P timers ··················\ ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ············· 105 Configuring ICMP to send error packets ··················\ ··················\ ··················\ ··················\ ················ ··················\ ········· 106 Advantages of sending ICMP error packets ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 106 Disadvantages of sending ICMP error packets ··················\ ··················\ ··················\ ··················\ ··········· ············· 107 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 107 Displaying and maintaining IP performance optimization ··················\ ··················\ ··················\ ··················\ ·············· 108 Configuring UDP helper··················\ ··················\ ··················\ ··················\ ··················\ ··············· ··················\ ··············· 109 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ···· 109 Configuration restrictions and guidelines ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 109 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ·· 109 Displaying and mainta ining UDP helper ··················\ ··················\ ··················\ ··················\ ················· ··················\ ········ 110 UDP helper configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ···· ··················\ ············ 110 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 110 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 110 Configuring IPv6 bas ics ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ················· 112 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ···· 112 IPv6 features ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ········ 112 IPv6 addresses ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······················\ ··················\ · 113 IPv6 neighbor discovery protocol ·················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ······ 116 IPv6 path MTU discovery ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······ 118 IPv6 transition technologies ··················\ ··················\ ··················\ ··················\ ··················\ ········ ··················\ ············ 119 Protocols and standards ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ············ 119 IPv6 basics configuration task list ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ · 120 Configuring basic IPv6 functions ··················\ ··················\ ··················\ ··················\ ··················\ ···· ··················\ ················ 121 Enabling IPv6 ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ··················\ ·· 121 Configuring an IPv6 gl obal unicast address ··················\ ··················\ ··················\ ··················\ ············ ················ 121 Configuring an IPv6 link-local address ··················\ ··················\ ··················\ ··················\ ················ ··················\ ··· 123 Configure an IPv6 anycast address ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ······· 124 Configuring IPv6 ND ··················\ ··················\ ··················\ ··················\ ··················\ ················· ··················\ ··················\ ···· 125 Configuring a static neighbor entry ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ ····· 125
vi Configuring the maximum number of neighbors dynamically learned ··················\ ··················\ ··················\ ··· 125 Setting the age timer for ND entries in stale state ··················\ ··················\ ··················\ ··················\ ··· ················ 126 Configuring parameters re lated to RA messages ··················\ ··················\ ··················\ ··················\ ········· ··········· 126 Configuring the maximum number of attemp ts to send an NS message for DAD ··················\ ··················\ ··· 128 Configuring ND snooping ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ········· 129 Enabling ND proxy ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ · ··················\ ·············· 131 Configuring path MTU discovery ··················\ ··················\ ··················\ ··················\ ··················\ ······ ··················\ ············· 133 Configuring a static path MTU for a specified IPv6 address ··················\ ··················\ ··················\ ··················\ ·· 133 Configuring the aging time for dynamic path MTUs ··················\ ··················\ ··················\ ··················\ ······ ········· 133 Configuring IPv6 TCP properties ··················\ ··················\ ··················\ ··················\ ··················\ ····· ··················\ ··············· 133 Configuring ICMPv6 packet sending ··················\ ··················\ ··················\ ··················\ ··················\ ··· ··················\ ·········· 134 Configuring the maximum ICMPv6 erro r packets sent in an interval ··················\ ··················\ ··················\ ······ 134 Enabling replying to multicast echo requests ··················\ ··················\ ··················\ ··················\ ·········· ················· 134 Enabling sending of ICMPv6 time exceeded messages ··················\ ··················\ ··················\ ··················\ ····· ···· 135 Enabling sending of ICMPv6 dest ination unreachable messages ··················\ ··················\ ··················\ ··········· 135 Displaying and maintaining IPv6 basics configuration ··················\ ··················\ ··················\ ··················\ ··················\ ·· 136 IPv6 basics configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ··· ··················\ ············· 137 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 137 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 138 Verifying the configuration ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············ 139 Troubleshooting IPv6 ba sics configuration ··················\ ··················\ ··················\ ··················\ ············· ··················\ ········· 142 Symptom ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ·············· 142 Solution ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ················ 142 DHCPv6 overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··· ··················\ ··················\ 143 Introduction to DHCPv6 ··················\ ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ··················\ ··· 143 DHCPv6 address/prefix assignment ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·············· 143 Rapid assignment involving two messages··················\ ··················\ ··················\ ··················\ ················ ··············· 143 Assignment involv ing four messages ··················\ ··················\ ··················\ ··················\ ··················\ ·· ··················\ ··· 143 Address/prefix lease renewal ··················\ ··················\ ··················\ ··················\ ··················\ ········ ··················\ ················ 144 Configuring stateless DHCPv6 ··················\ ··················\ ··················\ ··················\ ··················\ ········ ··················\ ················ 145 Operation ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ············ 145 Protocols and standards ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··················\ ··· 146 Configuring DHCPv6 server ··················\ ··················\ ··················\ ··················\ ··················\ ··········· ··················\ ············ 147 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ···· 147 Concepts··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·····························\ ··················\ ···· 147 Prefix selection process ··················\ ··················\ ··················\ ··················\ ··················\ ············ ··················\ ··············· 148 DHCPv6 server configuration task list ··················\ ··················\ ··················\ ··················\ ················· ··················\ ············· 148 Enabling the DHCPv6 server ··················\ ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ················ 149 Creating a prefix pool ··················\ ··················\ ··················\ ··················\ ··················\ ·············· ··················\ ··················\ ····· 149 Configuring a DHCPv6 address pool ··················\ ··················\ ··················\ ··················\ ··················\ ··· ··················\ ········· 149 Configuration restrictio ns and guidelines ··················\ ··················\ ··················\ ··················\ ············· ··················\ ·· 149 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 149 Applying the address p ool to an interface ··················\ ··················\ ··················\ ··················\ ············· ··················\ ········· 150 Setting the DSCP value for DHCPv6 packets ··················\ ··················\ ··················\ ··················\ ············· ··················\ ····· 151 Displaying and maintainin g the DHCPv6 server ··················\ ··················\ ··················\ ··················\ ·········· ··················\ ·· 151 DHCPv6 server configuration example ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ·········· 151 Network requirements ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··········· 151 Configuration considerations ··················\ ··················\ ··················\ ··················\ ··················\ ········ ··················\ ········· 152 Configuration procedure ··················\ ··················\ ··················\ ··················\ ··················\ ············· ··················\ ··········· 152 Verifying the configuration ··················\ ··················\ ··················\ ··················\ ··················\ ········· ··················\ ············ 153 Configuring DHCPv6 relay agent ··················\ ··················\ ··················\ ··················\ ··················\ ······ ··················\ ········ 155 Overview ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ··················\ ···················\ ··················\ ···· 155 DHCPv6 relay agent operation ··················\ ··················\ ··················\ ··················\ ··················\ ··························\ ····· 155