HP 5500 Ei 5500 Si Switch Series Configuration Guide
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![Page 926
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Reply from 9.1.2.1: bytes=56 Sequence=2 ttl=254 time=31 ms
Reply from 9.1.2.1: bytes=56 Sequence=3 ttl=254 time=47 ms
Reply from 9.1.2.1: bytes=56 Sequence=4 ttl=254 time=46 ms
Reply from 9.1.2.1: bytes=56 Sequence=5 ttl=254 time=47 ms
--- 9.1.2.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 15/37/47 ms
[SwitchC] ping -a 9.1.2.1 8.1.1.1
PING 8.1.1.1: 56 data bytes, press CTRL_C to break...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-925.png "Page 926
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Reply from 9.1.2.1: bytes=56 Sequence=2 ttl=254 time=31 ms
Reply from 9.1.2.1: bytes=56 Sequence=3 ttl=254 time=47 ms
Reply from 9.1.2.1: bytes=56 Sequence=4 ttl=254 time=46 ms
Reply from 9.1.2.1: bytes=56 Sequence=5 ttl=254 time=47 ms
--- 9.1.2.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 15/37/47 ms
[SwitchC] ping -a 9.1.2.1 8.1.1.1
PING 8.1.1.1: 56 data bytes, press CTRL_C to break...")
![Page 928
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BGP Local router ID is 1.1.1.1
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? – incomplete
Network NextHop MED LocPrf PrefVal Pa\
th/Ogn
*> 8.1.1.0/24 0.0.0.0 0 0 i \
*> 9.1.1.0/24 3.1.1.1 0 0 65\
009i
* 3.1.2.1...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-927.png "Page 928
239
BGP Local router ID is 1.1.1.1
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? – incomplete
Network NextHop MED LocPrf PrefVal Pa\
th/Ogn
*> 8.1.1.0/24 0.0.0.0 0 0 i \
*> 9.1.1.0/24 3.1.1.1 0 0 65\
009i
* 3.1.2.1...")
![Page 929
240
BGP community configuration
Network requirements
As shown in Figure 93, Switch B establishes EBGP connections with Switch A and C. Configure
No_Export community attribute on Switch A to make routes from AS 10 not advertised by AS 20 to any
other AS.
Figure 93 Network diagram
Configuration procedure
1. Configure IP addresses for inte rfaces. (Details not shown.)
2. Configure EBGP:
# Configure Switch A.
system-view
[SwitchA] bgp 10
[SwitchA-bgp] router-id 1.1.1.1
[SwitchA-bgp] peer...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-928.png "Page 929
240
BGP community configuration
Network requirements
As shown in Figure 93, Switch B establishes EBGP connections with Switch A and C. Configure
No_Export community attribute on Switch A to make routes from AS 10 not advertised by AS 20 to any
other AS.
Figure 93 Network diagram
Configuration procedure
1. Configure IP addresses for inte rfaces. (Details not shown.)
2. Configure EBGP:
# Configure Switch A.
system-view
[SwitchA] bgp 10
[SwitchA-bgp] router-id 1.1.1.1
[SwitchA-bgp] peer...")
![Page 930
241
Local AS number : 20
Paths: 1 available, 1 best
BGP routing table entry information of 9.1.1.0/24:
From : 200.1.2.1 (1.1.1.1)
Original nexthop: 200.1.2.1
AS-path : 10
Origin : igp
Attribute value : MED 0, pref-val 0, pre 255
State : valid, external, best,
Advertised to such 1 peers:
200.1.3.2
Switch B advertised routes to Switch C in AS30.
# Display the routing table on Switch C.
[SwitchC] display bgp routing-table
Total Number...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-929.png "Page 930
241
Local AS number : 20
Paths: 1 available, 1 best
BGP routing table entry information of 9.1.1.0/24:
From : 200.1.2.1 (1.1.1.1)
Original nexthop: 200.1.2.1
AS-path : 10
Origin : igp
Attribute value : MED 0, pref-val 0, pre 255
State : valid, external, best,
Advertised to such 1 peers:
200.1.3.2
Switch B advertised routes to Switch C in AS30.
# Display the routing table on Switch C.
[SwitchC] display bgp routing-table
Total Number...")
![Page 932
243
# Configure Switch C.
system-view
[SwitchC] bgp 200
[SwitchC-bgp] router-id 3.3.3.3
[SwitchC-bgp] peer 193.1.1.2 as-number 200
[SwitchC-bgp] peer 194.1.1.2 as-number 200
[SwitchC-bgp] quit
# Configure Switch D.
system-view
[SwitchD] bgp 200
[SwitchD-bgp] router-id 4.4.4.4
[SwitchD-bgp] peer 194.1.1.1 as-number 200
[SwitchD-bgp] quit
3. Configure the route reflector:
# Configure Switch C.
[SwitchC] bgp 200
[SwitchC-bgp] peer 193.1.1.2 reflect-client
[SwitchC-bgp] peer 194.1.1.2...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-931.png "Page 932
243
# Configure Switch C.
system-view
[SwitchC] bgp 200
[SwitchC-bgp] router-id 3.3.3.3
[SwitchC-bgp] peer 193.1.1.2 as-number 200
[SwitchC-bgp] peer 194.1.1.2 as-number 200
[SwitchC-bgp] quit
# Configure Switch D.
system-view
[SwitchD] bgp 200
[SwitchD-bgp] router-id 4.4.4.4
[SwitchD-bgp] peer 194.1.1.1 as-number 200
[SwitchD-bgp] quit
3. Configure the route reflector:
# Configure Switch C.
[SwitchC] bgp 200
[SwitchC-bgp] peer 193.1.1.2 reflect-client
[SwitchC-bgp] peer 194.1.1.2...")
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245
[SwitchB-bgp] confederation id 200
[SwitchB-bgp] confederation peer-as 65001 65003
[SwitchB-bgp] peer 10.1.1.1 as-number 65001
[SwitchB-bgp] quit
# Configure Switch C.
system-view
[SwitchC] bgp 65003
[SwitchC-bgp] router-id 3.3.3.3
[SwitchC-bgp] confederation id 200
[SwitchC-bgp] confederation peer-as 65001 65002
[SwitchC-bgp] peer 10.1.2.1 as-number 65001
[SwitchC-bgp] quit
3. Configure IBGP connections in AS65001:
# Configure Switch A.
[SwitchA] bgp 65001
[SwitchA-bgp] peer...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-933.png "Page 934
245
[SwitchB-bgp] confederation id 200
[SwitchB-bgp] confederation peer-as 65001 65003
[SwitchB-bgp] peer 10.1.1.1 as-number 65001
[SwitchB-bgp] quit
# Configure Switch C.
system-view
[SwitchC] bgp 65003
[SwitchC-bgp] router-id 3.3.3.3
[SwitchC-bgp] confederation id 200
[SwitchC-bgp] confederation peer-as 65001 65002
[SwitchC-bgp] peer 10.1.2.1 as-number 65001
[SwitchC-bgp] quit
3. Configure IBGP connections in AS65001:
# Configure Switch A.
[SwitchA] bgp 65001
[SwitchA-bgp] peer...")
![Page 935
246
[SwitchF-bgp] quit
5. Verify the configuration:
# Display the routing table on Switch B.
[SwitchB] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 2.2.2.2
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/Ogn \
*>i 9.1.1.0/24 10.1.1.1...](http://img.usermanuals.tech/thumb/36/58909/w64_hp-5500-ei-5500-si-switch-series-configuration-guide-934.png "Page 935
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[SwitchF-bgp] quit
5. Verify the configuration:
# Display the routing table on Switch B.
[SwitchB] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 2.2.2.2
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/Ogn \
*>i 9.1.1.0/24 10.1.1.1...")
242 Attribute value : MED 0, pref-val 0, pre 255 State : valid, external, best, Not advertised to any peers yet The route 9.1.1.0/24 is not available in the routing table of Switch C. BGP route reflector configuration Network requirements In Figure 94 , all s witches run BGP. • Between Switch A and Switch B is an EBGP co nnection; between Switch C and Switch B, and between Switch C and Switch D are IBGP connections. • Switch C is a route reflector with clients Switch B and D. • Switch D can learn route 1.0.0.0/8 from Switch C. Figure 94 Network diagram Configuration procedure 1. Configure IP addresses for inte rfaces. (Details not shown.) 2. Configure BGP connections: # Configure Switch A. system-view [SwitchA] bgp 100 [SwitchA-bgp] router-id 1.1.1.1 [SwitchA-bgp] peer 192.1.1.2 as-number 200 # Inject network 1.0.0.0/8 to the BGP routing table. [SwitchA-bgp] network 1.0.0.0 [SwitchA-bgp] quit # Configure Switch B. system-view [SwitchB] bgp 200 [SwitchB-bgp] router-id 2.2.2.2 [SwitchB-bgp] peer 192.1.1.1 as-number 100 [SwitchB-bgp] peer 193.1.1.1 as-number 200 [SwitchB-bgp] peer 193.1.1.1 next-hop-local [SwitchB-bgp] quit
243
# Configure Switch C.
system-view
[SwitchC] bgp 200
[SwitchC-bgp] router-id 3.3.3.3
[SwitchC-bgp] peer 193.1.1.2 as-number 200
[SwitchC-bgp] peer 194.1.1.2 as-number 200
[SwitchC-bgp] quit
# Configure Switch D.
system-view
[SwitchD] bgp 200
[SwitchD-bgp] router-id 4.4.4.4
[SwitchD-bgp] peer 194.1.1.1 as-number 200
[SwitchD-bgp] quit
3. Configure the route reflector:
# Configure Switch C.
[SwitchC] bgp 200
[SwitchC-bgp] peer 193.1.1.2 reflect-client
[SwitchC-bgp] peer 194.1.1.2 reflect-client
[SwitchC-bgp] quit
4. Verify the configuration:
# Display the BGP routing table on Switch B.
[SwitchB] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 200.1.2.2
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/O\
gn
*> 1.0.0.0 192.1.1.1 0 0 100i
# Display the BGP routing table on Switch D.
[SwitchD] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 200.1.2.1
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/O\
gn
i 1.0.0.0 193.1.1.2 0 100 0 100i
Switch D has learned route 1.0.0.0/8 from Switch C.
244 BGP confederation configuration Network requirements In Figure 95 , to reduce IBGP connections in AS 200, split it into three sub-ASs: AS65001, AS65002, and AS65003. Switches in AS65001 are fully meshed. Figure 95 Network diagram Device Interface IP address Device Interface IP address Switch A Vlan-int100 200.1.1.1/24 Switch D Vlan-int200 10.1.5.1/24 Vlan-int200 10.1.1.1/24 Vlan-int400 10.1.3.2/24 Vlan-int300 10.1.2.1/24 Switch E Vlan-int200 10.1.5.2/24 Vlan-int400 10.1.3.1/24 Vlan-int500 10.1.4.2/24 Vlan-int500 10.1.4.1/24 Switch F Vlan-int100 200.1.1.2/24 Switch B Vlan-int200 10.1.1.2/24 Vlan-int600 9.1.1.1/24 Switch C Vlan-int300 10.1.2.2/24 Configuration procedure 1. Configure IP addresses for inte rfaces. (Details not shown.) 2. Configure BGP confederation: # Configure Switch A. system-view [SwitchA] bgp 65001 [SwitchA-bgp] router-id 1.1.1.1 [SwitchA-bgp] confederation id 200 [SwitchA-bgp] confederation peer-as 65002 65003 [SwitchA-bgp] peer 10.1.1.2 as-number 65002 [SwitchA-bgp] peer 10.1.1.2 next-hop-local [SwitchA-bgp] peer 10.1.2.2 as-number 65003 [SwitchA-bgp] peer 10.1.2.2 next-hop-local [SwitchA-bgp] quit # Configure Switch B. system-view [SwitchB] bgp 65002 [SwitchB-bgp] router-id 2.2.2.2 Switch F Switch A Switch D Switch E AS 200 AS 100 Vlan-int600 Switch B Switch C AS 65002 AS 65003 Vlan-int100 Vlan-int100 AS 65001 Vlan-int200Vla n-int30 0Vlan-int400 Vlan-int500 Vlan-int400 Vlan-int500 Vlan-int200 Vlan-int200 Vlan-int300 Vlan-int200
245 [SwitchB-bgp] confederation id 200 [SwitchB-bgp] confederation peer-as 65001 65003 [SwitchB-bgp] peer 10.1.1.1 as-number 65001 [SwitchB-bgp] quit # Configure Switch C. system-view [SwitchC] bgp 65003 [SwitchC-bgp] router-id 3.3.3.3 [SwitchC-bgp] confederation id 200 [SwitchC-bgp] confederation peer-as 65001 65002 [SwitchC-bgp] peer 10.1.2.1 as-number 65001 [SwitchC-bgp] quit 3. Configure IBGP connections in AS65001: # Configure Switch A. [SwitchA] bgp 65001 [SwitchA-bgp] peer 10.1.3.2 as-number 65001 [SwitchA-bgp] peer 10.1.3.2 next-hop-local [SwitchA-bgp] peer 10.1.4.2 as-number 65001 [SwitchA-bgp] peer 10.1.4.2 next-hop-local [SwitchA-bgp] quit # Configure Switch D. system-view [SwitchD] bgp 65001 [SwitchD-bgp] router-id 4.4.4.4 [SwitchD-bgp] confederation id 200 [SwitchD-bgp] peer 10.1.3.1 as-number 65001 [SwitchD-bgp] peer 10.1.5.2 as-number 65001 [SwitchD-bgp] quit # Configure Switch E. system-view [SwitchE] bgp 65001 [SwitchE-bgp] router-id 5.5.5.5 [SwitchE-bgp] confederation id 200 [SwitchE-bgp] peer 10.1.4.1 as-number 65001 [SwitchE-bgp] peer 10.1.5.1 as-number 65001 [SwitchE-bgp] quit 4. Configure the EBGP connection between AS100 and AS200: # Configure Switch A. [SwitchA] bgp 65001 [SwitchA-bgp] peer 200.1.1.2 as-number 100 [SwitchA-bgp] quit # Configure Switch F. system-view [SwitchF] bgp 100 [SwitchF-bgp] router-id 6.6.6.6 [SwitchF-bgp] peer 200.1.1.1 as-number 200 [SwitchF-bgp] network 9.1.1.0 255.255.255.0
246
[SwitchF-bgp] quit
5. Verify the configuration:
# Display the routing table on Switch B.
[SwitchB] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 2.2.2.2
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/Ogn \
*>i 9.1.1.0/24 10.1.1.1 0 100 0 (650\
01) 100i
[SwitchB] display bgp routing-table 9.1.1.0
BGP local router ID : 2.2.2.2
Local AS number : 65002
Paths: 1 available, 1 best
BGP routing table entry information of 9.1.1.0/24:
From : 10.1.1.1 (1.1.1.1)
Relay Nexthop : 0.0.0.0
Original nexthop: 10.1.1.1
AS-path : (65001) 100
Origin : igp
Attribute value : MED 0, localpref 100, pref-val 0, pre 255
State : valid, external-confed, best,
Not advertised to any peers yet
# Display the BGP routing table on Switch D.
[SwitchD] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 4.4.4.4
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Pat\
h/Ogn
*>i 9.1.1.0/24 10.1.3.1 0 100 0 100i
[SwitchD] display bgp routing-table 9.1.1.0
BGP local router ID : 4.4.4.4
Local AS number : 65001
Paths: 1 available, 1 best
BGP routing table entry information of 9.1.1.0/24:
247
From : 10.1.3.1 (1.1.1.1)
Relay Nexthop : 0.0.0.0
Original nexthop: 10.1.3.1
AS-path : 100
Origin : igp
Attribute value : MED 0, localpref 100, pref-val 0, pre 255
State : valid, internal, best,
Not advertised to any peers yet
The output shows the following:
{ Switch F can send route information to Switch B and Switch C through the confederation by
establishing only an EBGP connection with Switch A.
{ Switch B and Switch D are in the same confederation, but belong to different sub ASs. They
obtain external route information from Switch A and generate the same BGP route entries; it
seems like they reside in the same AS although they have no direct connection in between.
BGP path selection configuration
Network requirements
In Figure 96 , all s witches run BGP. Between Switch A and Switch B, and between Switch A and Switch
C are EBGP connections. Between Switch B and Switch D, and between Switch D and Switch C are IBGP
connections. OSPF is the IGP protocol in AS 200.
Configure routing policies, making Switch D use the route 1.0.0.0/8 from Switch C as the optimal.
Figure 96 Network diagram
Device Interface IP address Device Interface IP address
Switch A Vlan-int101 1.0.0.0/8 Switch D Vlan-int400 195.1.1.1/24
Vlan-int100 192.1.1.1/24 Vlan-int300 194.1.1.1/24
Vlan-int200 193.1.1.1/24 Switch C Vlan-int400 195.1.1.2/24
Switch B Vlan-int100 192.1.1.2/24 Vlan-int200 193.1.1.2/24
Vlan-int300 194.1.1.2/24
Configuration procedure
1. Configure IP addresses for inte rfaces. (Details not shown.)
2. Configure OSPF on Switch B, C, and D:
# Configure Switch B.
system-view
Switch AAS 100
Vlan-int101
Switch CAS 200
Vlan-int200
Switch B
Switch D
Vlan-int100
Vlan-int200 Vlan-int400Vlan-int400
Vlan-int300
Vlan-int300
Vlan-int100
248 [SwitchB] ospf [SwitchB-ospf] area 0 [SwitchB-ospf-1-area-0.0.0.0] network 192.1.1.0 0.0.0.255 [SwitchB-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255 [SwitchB-ospf-1-area-0.0.0.0] quit [SwitchB-ospf-1] quit # Configure Switch C. system-view [SwitchC] ospf [SwitchC-ospf] area 0 [SwitchC-ospf-1-area-0.0.0.0] network 193.1.1.0 0.0.0.255 [SwitchC-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255 [SwitchC-ospf-1-area-0.0.0.0] quit [SwitchC-ospf-1] quit # Configure Switch D. system-view [SwitchD] ospf [SwitchD-ospf] area 0 [SwitchD-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255 [SwitchD-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255 [SwitchD-ospf-1-area-0.0.0.0] quit [SwitchD-ospf-1] quit 3. Configure BGP connections: # Configure Switch A. system-view [SwitchA] bgp 100 [SwitchA-bgp] peer 192.1.1.2 as-number 200 [SwitchA-bgp] peer 193.1.1.2 as-number 200 # Inject network 1.0.0.0/8 to the BGP routing table on Switch A. [SwitchA-bgp] network 1.0.0.0 8 [SwitchA-bgp] quit # Configure Switch B. [SwitchB] bgp 200 [SwitchB-bgp] peer 192.1.1.1 as-number 100 [SwitchB-bgp] peer 194.1.1.1 as-number 200 [SwitchB-bgp] quit # Configure Switch C. [SwitchC] bgp 200 [SwitchC-bgp] peer 193.1.1.1 as-number 100 [SwitchC-bgp] peer 195.1.1.1 as-number 200 [SwitchC-bgp] quit # Configure Switch D. [SwitchD] bgp 200 [SwitchD-bgp] peer 194.1.1.2 as-number 200 [SwitchD-bgp] peer 195.1.1.2 as-number 200 [SwitchD-bgp] quit
249
4.
Configure attributes for route 1.0.0.0/8, making Switch D give priority to the route learned from
Switch C:
{ Method I
Configure a higher MED value for the route 1. 0.0.0/8 advertised from Switch A to peer
192.1.1.2.
# Define an ACL numbered 2000 to permit route 1.0.0.0/8.
[SwitchA] acl number 2000
[SwitchA-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255
[SwitchA-acl-basic-2000] quit
# Define two routing policies, apply_med_50 , which sets the MED for route 1.0.0.0/8 to 50,
and apply_med_100 , which sets the MED for route 1.0.0.0/8 to 100.
[SwitchA] route-policy apply_med_50 permit node 10
[SwitchA-route-policy] if-match acl 2000
[SwitchA-route-policy] apply cost 50
[SwitchA-route-policy] quit
[SwitchA] route-policy apply_med_100 permit node 10
[SwitchA-route-policy] if-match acl 2000
[SwitchA-route-policy] apply cost 100
[SwitchA-route-policy] quit
# Apply routing policy apply_med_50 to the route advertised to peer 193.1.1.2 (Switch C),
and apply_med_100 to the route advertised to peer 192.1.1.2 (Switch B).
[SwitchA] bgp 100
[SwitchA-bgp] peer 193.1.1.2 route-policy apply_med_50 export
[SwitchA-bgp] peer 192.1.1.2 route-policy apply_med_100 export
[SwitchA-bgp] quit
# Display the BGP routing table on Switch D.
[SwitchD] display bgp routing-table
Total Number of Routes: 2
BGP Local router ID is 194.1.1.1
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/O\
gn
*>i 1.0.0.0 193.1.1.1 50 100 0 100i
* i 192.1.1.1 100 100 0 100i
Route 1.0.0.0/8 is the optimal.
{ Method II
Configure different local preferences on Switch B and C for route 1.0.0.0/8, making Switch
D give priority to the route from Switch C.
# Define an ACL numbered 2000 on Rout er C, permitting route 1.0.0.0/8.
[SwitchC] acl number 2000
[SwitchC-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255
[SwitchC-acl-basic-2000] quit
250
# Configure a routing policy named localpref on Switch C, setting the local preference of route
1.0.0.0/8 to 200 (the default is 100).
[SwitchC] route-policy localpref permit node 10
[SwitchC-route-policy] if-match acl 2000
[SwitchC-route-policy] apply local-preference 200
[SwitchC-route-policy] quit
# Apply routing policy localpref to routes from peer 193.1.1.1.
[SwitchC] bgp 200
[SwitchC-bgp] peer 193.1.1.1 route-policy localpref import
[SwitchC-bgp] quit
# Display the routing table on Switch D.
[SwitchD] display bgp routing-table
Total Number of Routes: 2
BGP Local router ID is 194.1.1.1
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/O\
gn
*>i 1.0.0.0 193.1.1.1 0 200 0 100i
* i 192.1.1.1 0 100 0 100i
Route 1.0.0.0/8 from Switch D to Switch C is the optimal.
BGP GR configuration
Network requirements
All switches run BGP in Figure 97 . Between Switch A and Switch B is an EBGP connection. Switch B and
Switch C are connected over an IBGP connection. Enable GR capability for BGP so that the
communication between Switch A and Switch C is not affected when a master/slave switchover occurs
on Switch B.
Figure 97 Network diagram
Configuration procedure
1. Configure Switch A:
# Configure IP addresses for interfaces. (Details not shown.)
# Configure the EBGP connection.
system-view
251 [SwitchA] bgp 65008 [SwitchA-bgp] router-id 1.1.1.1 [SwitchA-bgp] peer 200.1.1.1 as-number 65009 # Inject network 8.0.0.0/8 to the BGP routing table. [SwitchA-bgp] network 8.0.0.0 # Enable GR capability for BGP. [SwitchA-bgp] graceful-restart 2. Configure Switch B: # Configure IP addresses for interfaces. (Details not shown.) # Configure the EBGP connection. system-view [SwitchB] bgp 65009 [SwitchB-bgp] router-id 2.2.2.2 [SwitchB-bgp] peer 200.1.1.2 as-number 65008 # Configure the IBGP connection. [SwitchB-bgp] peer 9.1.1.2 as-number 65009 # Inject networks 200.1.1.0/24 and 9. 1.1.0/24 to the BGP routing table. [SwitchB-bgp] network 200.1.1.0 24 [SwitchB-bgp] network 9.1.1.0 24 # Enable GR capability for BGP. [SwitchB-bgp] graceful-restart 3. Configure Switch C: # Configure IP addresses for interfaces. (Details not shown.) # Configure the IBGP connection. system-view [SwitchC] bgp 65009 [SwitchC-bgp] router-id 3.3.3.3 [SwitchC-bgp] peer 9.1.1.1 as-number 65009 # Enable GR capability for BGP. [SwitchC-bgp] graceful-restart 4. Verify the configuration: Ping Switch C on Switch A. Meanwhile, perform a master/slave switchover on Switch B. The ping operation is successful during the whole switchover process. Configuring BFD for BGP Network requirements As shown in Figure 98, • C onfigure OSPF as the IGP in AS 200. • Establish two IBGP connections between Switch A and Switch C. When both links are working, Switch C adopts the link Switch ASwitch BSwitch C to exchange packets with network 1.1.1.0/24. Configure BFD over the link. Then if the link fails, BFD can quickly detect the failure and notify it to BGP. Then the link Switch ASw itch DSwitch C takes effect immediately.