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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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# Create VLAN 100, assign GigabitEthernet 1/0/1 through GigabitEthernet 1/0/4 to this VLAN, 
and enable MLD snooping and IPv6 PIM snooping in the VLAN.  
[SwitchA] vlan 100 
[SwitchA-vlan100] port gigabitethernet 1/0/1 to gigabitethernet 1/0/4 
[SwitchA-vlan100] mld-snooping enable 
[SwitchA-vlan100] pim-snooping ipv6 enable 
[SwitchA-vlan100] quit 
7. Verify the configuration: 
# On Switch A, display the IPv6 PIM snoo ping neighbor information of VLAN 100. 
[SwitchA] display pim-snooping ipv6 neighbor vlan 100 
  Total number of neighbors: 4 
 
  VLAN ID: 100 
    Total number of neighbors: 4 
    Neighbor        Port                     Expires   Option Flags 
    FE80::1         GE1/0/1                   02:02:23  LAN Prune Delay \
    FE80::2         GE1/0/2                   03:00:05  LAN Prune Delay \
    FE80::3         GE1/0/3                   02:22:13  LAN Prune Delay \
    FE80::4         GE1/0/4                   03:07:22  LAN Prune Delay \
The output shows that Router A, Router B, Router C, and Router D are IPv6 PIM snooping 
neighbors.  
# On Switch A, display the IPv6 PIM snooping routing information of VLAN 100.  
[SwitchA] display pim-snooping ipv6 routing-table vlan 100 slot 1 
  Total 2 entry(ies) 
  FSM Flag: NI-no info, J-join, PP-prune pending 
 
  VLAN ID: 100 
    Total 2 entry(ies) 
    (*, FF1E::101) 
      Upstream neighbor: FE80::1 
        Upstream port: GE1/0/1 
        Total number of downstream ports: 1 
          1: GE1/0/3 
             Expires: 00:03:01, FSM: J 
    (*, FF2E::101) 
      Upstream neighbor: FE80::1 
        Upstream port: GE1/0/2 
        Total number of downstream ports: 1 
          1: GE1/0/4 
             Expires: 00:01:05, FSM: J 
The output shows that Switch A will forward the  multicast data intended for IPv6 multicast group 
FF1E::101 to only Router C, and forward the mu lticast data intended for IPv6 multicast group 
FF2E::101 to only Router D.
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Troubleshooting IPv6 PIM snooping 
IPv6 PIM snooping does not work 
Symptom 
IPv6 PIM snooping does not work.  
Analysis 
MLD snooping or IPv6 PIM snooping is not enabled on the switch.  
Solution 
1. Use the  display current-configuration  c o m m a n d  t o  c h e c k  t h e  s t a t u s  o f  M L D  s n o o p i n g  a n d  I P v 6  P I M  
snooping. 
2.  If MLD snooping is not enabled, enter system view and use the  mld-snooping command to enable 
MLD snooping globally. Then, enter VLAN view and use the  mld-snooping enable and 
pim-snooping ipv6 enable  commands to enable MLD snooping and IPv6 PIM snooping in the 
VLAN. 
3.  If IPv6 PIM snooping is not enabled, enter VLAN view and use the  pim-snooping ipv6 enable 
command to enable IPv6 PIM snooping in the VLAN.  
Some downstream IPv6 PIM-capable routers cannot receive 
multicast data 
Symptom 
In a network with fragmented join/prune messages,  some downstream IPv6 PIM-capable routers cannot 
receive multicast data.  
Analysis 
IPv6 PIM snooping cannot reassemble messages, and it cannot maintain the status of downstream 
routers that the join/prune message fragments carry.  To ensure the normal operation of the system, IPv6 
PIM snooping must broadcast join/prune message frag ments in the VLAN. However, if the VLAN has an 
IPv6 PIM-capable router that has the join suppression function enabled, the broadcast join/prune 
message fragments might suppress the  join messages of other IPv6 PIM-capable routers in the VLAN. As 
a result, some IPv6 PIM-capable routers cannot re ceive the multicast data addressed to a specific 
multicast group because their join messages are suppressed. To solve this problem, disable the join 
suppression function on all IPv6 PIM-capable routers that connect to the IPv6 PIM snooping-capable 
switch in the VLAN.  
Solution 
1.  Use the  pim ipv6 hello-option neighbor-tracking  command to enable the neighbor tracking 
function on the interfaces of IPv6 PIM-ca pable routers that connect to the IPv6 PIM 
snooping-capable switch. 
2.  If the network has an IPv6 PIM-capable router that cannot be enabled with the neighbor tracking 
function, be sure to disable  IPv6 PIM snooping on the IPv6 PIM snooping-capable switch.
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Configuring IPv6 multicast VLANs 
Overview 
As shown in Figure 75, in the traditional IPv6 multicast programs-on-demand mode, when hosts (Host A, 
Host B, and Host C), which belong to different VLANs, require IPv6 multicast programs on demand 
service, the Layer 3 device, Router A, must forward a separate copy of the multicast traffic in each user 
VL A N to  the  Layer  2  devic e, Swi tch A . This  resu l ts  i n  not only waste of network bandwidth but also extra 
burden on the Layer 3 device.  
Figure 75  Multicast transmission without IPv6 multicast VLAN 
 
 
The IPv6 multicast VLAN feature configured on the Layer 2 device is the solution to this issue. With the 
IPv6 multicast VLAN feature, the Layer 3 device needs to replicate the multicast traffic only in the IPv6 
multicast VL AN instead of making a separate copy of the multicast traffic in each user VL AN. This saves 
the network bandwidth and lessens the burden of the Layer 3 device. 
 
The IPv6 multicast VLAN feature can be implemented in sub-VLAN-based IPv6 multicast VLAN and 
port-based IPv6 multicast VLAN.  
Sub-VLAN-based IPv6 multicast VLAN 
As shown in Figure 76 , Host A, Host B and Host C are in differ ent user VLANs. On Switch A, configure 
VLAN 10 as an IPv6 multicast VLAN, configure all the user VLANs as sub-VLANs of VLAN 10, and 
enable MLD snooping in the IPv6 multicast VLAN.  
Source Receiver
Host A
 IPv6 Multicast packetsVLAN 2
VLAN 3
VLAN 4
VLAN 2
VLAN 3
VLAN 4
Switch A Receiver
Host B
Receiver Host CRouter A
MLD querier
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    							 288 
Figure 76 Sub-VLAN-based IPv6 multicast VLAN 
 
 
After the configuration, MLD snooping manages router ports in the IPv6 multicast VLAN and member 
ports in the sub-VLANs. When forwarding multicast dat a to Switch A, Router A sends only one copy of 
multicast data to Switch A in the IPv6 multicast VLAN, and Switch A distributes  the data to the sub-VLANs 
that contain receivers.  
Port-based IPv6 multicast VLAN 
As shown in  Figure 77, Ho st A, Host B, and Host C are in different user VLANs. All the user ports are 
hybrid ports. On Switch A, configure VLAN 10 as an IPv6 multicast VLAN, assign all the user ports to 
VLAN 10, and enable MLD snooping in the IPv6 multicast VLAN and all user VLANs.  
Figure 77  Port-based IPv6 multicast VLAN 
 
 
A f t e r  t h e  c o n fi g u ra t i o n,  i f  Swi t c h  A  re c eive s  a n  M L D  m e s s a g e  o n  a  u s e r  p o r t,  i t  t a g s  t h e  m e s s a g e  wi t h  t h e  
I P v 6  m u l t i c a s t  V L A N  I D  a n d  re l a ys  i t  t o  t h e  M L D  q u e ri e r,  s o  t h a t  M L D  s n o o p i n g  c a n  u n i f o r m l y  m a n a g e  t h e  
router ports and member ports in the IPv6 multicast VLAN. When Router A forwards multicast data to 
Switch A, it sends only one copy of multicast data to Switch A in the IPv6 multicast VL AN, and Switch A 
distributes the data to all member ports in the IPv6 multicast VLAN.  
For more information about MLD snooping,  router ports, and member ports, see Configuring MLD 
sn

ooping .  
Source
VLAN 2
VLAN 3
VLAN 4
GE1/0/1 GE1/0/2
GE1/0/3
GE1/0/4
Switch A
 IPv6 Multicast packets
Receiver Host A
Receiver Host B
Receiver Host C
Router A
MLD querier VLAN 10 (IPv6 Multicast VLAN)
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For more information about VLAN tags, see Layer 2—LAN Switching Configuration Guide.  
IPv6 multicast VLAN configuration task list 
 
Configuration task  Remarks 
Configuring a sub-VLAN-based IPv6 multicast VLAN 
Required 
Use either approach. 
Configuring a port-based IPv6 
multicast VLAN Configuring user port attributes 
Configuring IPv6 multicast VLAN ports  
 
 
NOTE: 
If you have configured both sub-VLAN-based IPv6  multicast VLAN and port-based IPv6 multicast VLAN
 
on a device, the port-based IPv6 multicast VLAN configuration is given preference.   
Configuring a sub-VLAN-based IPv6 multicast 
VLAN 
Configuration prerequisites 
Before you configure a sub-VLAN-based IPv6 multicast VLAN, complete the following tasks: 
•  Create VLANs as required. 
•   Enable MLD snooping in the VLAN to be configured as an IPv6 multicast VLAN. 
Configuration guidelines 
•  You cannot configure an IPv6 multicast VLAN on a device with IP multicast routing enabled. 
•   The VLAN to be configured as an IPv6 multicast VLAN must exist.  
•   The VLANs to be configured as the sub-VLANs of the IPv6 multicast VLAN must exist and must not 
be IPv6 multicast VLANs or sub-VLANs of any other IPv6 multicast VLAN.  
•   The total number of sub-VLANs of an IPv6 multicast VLAN must not exceed the maximum number 
the system can support. 
Configuration procedure 
In this approach, you configure a VLAN as an IPv6 multicast VLAN, and configure user VLANs as 
sub-VLANs of the IPv6 multicast VLAN.  
To configure a sub-VLAN-based IPv6 multicast VLAN: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the specified VLAN 
as an IPv6 multicast VLAN 
and enter IPv6 multicast 
VLAN view.  multicast-vlan ipv6
 vlan-id  No IPv6 multicast VLAN 
configured by default.
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Step Command Remarks 
3.  Configure the specified 
VLANs as sub-VLANs of the 
IPv6 multicast VLAN.  subvlan 
vlan-list  By default, an IPv6 multicast VLAN 
has no sub-VLANs.  
 
Configuring a port-based IPv6 multicast VLAN 
When you configure a port-based IPv6 multicast VLAN, you need to configure the attributes of each user 
port and then assign the ports to the IPv6 multicast VLAN.  
A user port can be configured as a multicast VLAN port 
o n l y  i f  i t  i s  a n  E t h e r n e t  p o r t  o r  L a ye r  2  a g g re g a t e  
interface.  
In Ethernet interface view or Layer 2 aggregate interf ace view, configurations that you make are effective 
only on the current interface. In port group view, co nfigurations that you make are effective on all ports 
in the current port group.  
Configuration prerequisites 
Before you configure a port-based IPv6 multicast VLAN, complete the following tasks:  
•   Create VLANs as required. 
•   Enable MLD snooping in the VLAN to be configured as an IPv6 multicast VLAN. 
•   Enable MLD snooping in all the user VLANs.  
Configuring user port attributes 
Configure the user ports as hybrid ports to permit packets of the specified user VLAN to pass and 
configure the user VLAN to which the user ports belong as the default VLAN.  
Configure the user ports to permit packets of the IPv6 multicast VLAN to pass and untag the packets. After 
receiving multicast packets tagged with the IPv6 multicast VLAN ID from the upstream device, the Layer 
2 device untags the multicast packets and forwards them to its downstream device.  
To configure user port attributes: 
 
Step  Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter interface view or port 
group view. 
• Enter interface view:  
interface  interface-type 
interface-number  
• Enter port group view:  
port-group  manual 
port-group-name   Use either command. 
3.
  Configure the user port link 
type as hybrid.  port link-type hybrid 
Access by default. 
4.  Specify the user VLAN that 
comprises the current user 
ports as the default VLAN.  port hybrid pvid vlan
 vlan-id   VLAN 1 by default.
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Step Command  Remarks 
5.  Configure the current user 
ports to permit packets of the 
specified IPv6 multicast VLAN 
to pass and untag the packets.  port hybrid vlan 
vlan-id-list 
{  tagged  | untagged  }  By default, a hybrid port permits 
only packets of VLAN 1 to pass.  
 
For more information about the 
port link-type, port hybrid pvid vlan , and port hybrid vlan  commands, 
see  Layer 2—LAN Switching Command Reference.   
Configuring IPv6 multicast VLAN ports 
Configuration guidelines 
In this approach, you configure a VLAN as an IPv6 multicast VLAN and assign user ports to it. You can 
do this by either adding the user ports in the IPv6 multicast VLAN or specifying the IPv6 multicast VLAN 
on the user ports. These two methods provide the same result.  
You cannot configure an IPv6 multicast VLAN on a device with multicast routing enabled.  
The VLAN to be configured as an IPv6 multicast VLAN must exist.  
A port can belong to only one IPv6 multicast VLAN. 
Configuration procedure 
To configure IPv6 multicast VLAN ports in IPv6 multicast VLAN view:  
Step Command  Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the specified VLAN 
as an IPv6 multicast VLAN 
and enter IPv6 multicast 
VLAN view.   multicast-vlan ipv6
 vlan-id   No IPv6 multicast VLAN 
configured by default.
 
3.  Configure the ports as 
member ports of the IPv6 
multicast VLAN.   port 
interface-list   By default, an IPv6 multicast 
VLAN has no member ports. 
 
 
To configure IPv6 multicast VLAN ports  in interface view or port group view:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the specified 
VLAN as an IPv6 multicast 
VLAN and enter IPv6 
multicast VLAN view.  multicast-vlan ipv6
 vlan-id   Not an IPv6 multicast VLAN 
by default. 
3.
  Return to system view. 
quit  N/A 
4.  Enter interface view or 
port group view. 
• Enter interface view:  
interface  interface-type interface-number
 
• Enter port group view:  
port-group  manual  port-group-name  Use either command.
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Step Command Remarks 
5.  Configure the ports as 
member ports of the IPv6 
multicast VLAN.  port multicast-vlan ipv6
 vlan-id   By default, a user port does 
not belong to any IPv6 
multicast VLAN.  
 
Displaying and maintaining IPv6 multicast VLAN 
 
Task Command Remarks 
Display information about an IPv6 
multicast VLAN.  display multicast-vlan ipv6
 
[ vlan-id  ] [ | {  begin |  exclude | 
include  } regular-expression ]   Available in any view 
 
IPv6 multicast VLAN configuration examples 
Sub-VLAN-based multicast VLAN configuration example 
Network requirements 
As shown in 
Figure 78, MLDv1 runs on Router A, and MLDv1 snooping runs on Switch A. Router A acts 
as the MLD querier. The IPv6 multicast source sends IPv6 multicast data to the IPv6 multicast group 
FF1E::101. Host A, Host B, Host C, and Host D are receivers of the IPv6 multicast group. The hosts belong 
to VLAN 2 through VLAN 5 respectively. 
Configure the sub-VLAN-based IPv6 multicast VLAN feature on Switch A so that Router A just sends IPv6 
multicast data to Switch A through the IPv6 multicast VLAN and Switch A forwards the traffic to the 
receivers that belong to different user VLANs.
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Figure 78 Network diagram 
 
 
Configuration procedure 
1. Enable IPv6 forwarding and configure IPv6 addresses: 
Enable IPv6 forwarding on each device and co nfigure an IPv6 address and address prefix for 
each interface as per  Figure 78. (Details 
 not shown.)  
2. Configure Router A: 
# Enable IPv6 multicast routing, enable IPv6 PIM-DM on each interface and enable MLD on the 
host-side interface GigabitEthernet 1/0/2.  
 system-view 
[RouterA] multicast ipv6 routing-enable 
[RouterA] interface gigabitethernet 1/0/1 
[RouterA-GigabitEthernet1/0/1] pim ipv6 dm 
[RouterA-GigabitEthernet1/0/1] quit 
[RouterA] interface gigabitethernet 1/0/2 
[RouterA-GigabitEthernet1/0/2] pim ipv6 dm 
[RouterA-GigabitEthernet1/0/2] mld enable 
3. Configure Switch A: 
# Enable MLD snooping globally.  
 system-view 
[SwitchA] mld-snooping 
[SwitchA-mld-snooping] quit 
# Create VLAN 2 through VLAN 5. 
[SwitchA] vlan 2 to 5 
# Configure GigabitEthernet 1/0/2 as a trunk port  that permits packets from VLAN 2 and VLAN 
3 to pass through. 
[SwitchA] interface gigabitethernet 1/0/2 
Source
G E1
/0
/2
G E1/
0
/3
Switch A MLD querier
Router A
GE1/0/11::2/64
GE1/0/2
2001::1/64
1::1/64
GE1/0/1
Switch B Switch CG
E1/
0
/1
G
E1/
0
/1
Receiver
Host A
VLAN 2
ReceiverHost B
VLAN 3 Receiver
Host C
VLAN 4
ReceiverHost D
VLAN 5
GE1/0/2 GE1/0/3 GE1/0/2 GE1/0/3
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[SwitchA-GigabitEthernet1/0/2] port link-type trunk 
[SwitchA-GigabitEthernet1/0/2] port trunk permit vlan 2 3 
[SwitchA-GigabitEthernet1/0/2] quit 
# Configure GigabitEthernet 1/0/3 as a trunk port that permits packets from VLAN 4 and VLAN 
5 to pass through. 
[SwitchA] interface gigabitethernet 1/0/3 
[SwitchA-GigabitEthernet1/0/3] port link-type trunk 
[SwitchA-GigabitEthernet1/0/3] port trunk permit vlan 4 5 
[SwitchA-GigabitEthernet1/0/3] quit 
# Create VLAN 10, assign GigabitEthernet 1/0/ 1 to this VLAN and enable MLD snooping in the 
VLAN.  
[SwitchA] vlan 10 
[SwitchA-vlan10] port gigabitethernet 1/0/1 
[SwitchA-vlan10] mld-snooping enable 
[SwitchA-vlan10] quit 
# Configure VLAN 10 as an IPv6 multicast VLAN  and configure VLAN 2 through VLAN 5 as its 
sub-VLANs. 
[SwitchA] multicast-vlan ipv6 10 
[SwitchA-ipv6-mvlan-10] subvlan 2 to 5 
[SwitchA-ipv6-mvlan-10] quit 
4.  Configure Switch B: 
# Enable MLD snooping globally. 
 system-view 
[SwitchB] mld-snooping 
[SwitchB-mld-snooping] quit 
# Create VLAN 2, assign GigabitEthernet 1/0/2 to VLAN 2, and enable MLD snooping in the 
VLAN. 
[SwitchB] vlan 2 
[SwitchB-vlan2] port gigabitethernet 1/0/2 
[SwitchB-vlan2] mld-snooping enable 
[SwitchB-vlan2] quit 
# Create VLAN 3, assign GigabitEthernet 1/0/3 to VLAN 3, and enable MLD snooping in the 
VLAN. 
[SwitchB] vlan 3 
[SwitchB-vlan3] port gigabitethernet 1/0/3 
[SwitchB-vlan3] mld-snooping enable 
[SwitchB-vlan3] quit 
# Configure GigabitEthernet 1/0/1 as a trunk port  that permits packets from VLAN 2 and VLAN 
3 to pass through. 
[SwitchB] interface gigabitethernet 1/0/1 
[SwitchB-GigabitEthernet1/0/1] port link-type trunk 
[SwitchB-GigabitEthernet1/0/1] port trunk permit vlan 2 3 
5.  Configure Switch C: 
The configurations required on Switch C are similar to those on Switch B.  
6. Verify the configuration: 
# Display information about the IPv6 multicast VLAN.
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