Example: Configuring IPv6 PIM-SSM

Network configuration

OSPFv3 runs on the network.
Receivers receive VOD information through multicast. The receiver groups of different organizations form stub networks, and one or more receiver hosts exist in each stub network. The entire IPv6 PIM domain operates in the SSM mode.
Host A and Host C are IPv6 multicast receivers on two stub networks N1 and N2.
The SSM group range is FF3E::/64.
MLDv2 runs between Switch A and N1, and between Switch B, Switch C, and N2.
Figure 124: Network diagram

Table 28: Interface and IPv6 address assignment

Device	Interface	IPv6 address	Device	Interface	IPv6 address
Switch A	Vlan-int100	1001::1/64	Switch D	Vlan-int300	4001::1/64
Switch A	Vlan-int101	1002::1/64	Switch D	Vlan-int101	1002::2/64
Switch A	Vlan-int102	1003::1/64	Switch D	Vlan-int105	4002::1/64
Switch B	Vlan-int200	2001::1/64	Switch E	Vlan-int104	3001::2/64
Switch B	Vlan-int103	2002::1/64	Switch E	Vlan-int103	2002::2/64
Switch C	Vlan-int200	2001::2/64	Switch E	Vlan-int102	1003::2/64
Switch C	Vlan-int104	3001::1/64	Switch E	Vlan-int105	4002::2/64

Procedure

Assign an IPv6 address and prefix length to each interface, as shown in Figure 124. (Details not shown.)
Configure OSPFv3 on the switches in the IPv6 PIM-SSM domain. (Details not shown.)
Enable IPv6 multicast routing, MLD, and IPv6 PIM-SM:
# On Switch A, enable IPv6 multicast routing.
```
<SwitchA> system-view
[SwitchA] ipv6 multicast routing
[SwitchA-mrib6] quit
```
# Enable MLDv2 on VLAN-interface 100 (the interface that connects to the stub network).
```
[SwitchA] interface vlan-interface 100
[SwitchA-Vlan-interface100] mld enable
[SwitchA-Vlan-interface100] mld version 2
[SwitchA-Vlan-interface100] quit
```
# Enable IPv6 PIM-SM on the other interfaces.
```
[SwitchA] interface vlan-interface 101
[SwitchA-Vlan-interface101] ipv6 pim sm
[SwitchA-Vlan-interface101] quit
[SwitchA] interface vlan-interface 102
[SwitchA-Vlan-interface102] ipv6 pim sm
[SwitchA-Vlan-interface102] quit
```
# Enable IPv6 multicast routing, MLD, and IPv6 PIM-SM on Switch B and Switch C in the same way Switch A is configured. (Details not shown.)
# Enable IPv6 multicast routing and IPv6 PIM-SM on Switch D and Switch E in the same way Switch A is configured. (Details not shown.)

Configure the IPv6 SSM group range FF3E::/64 on Switch A.

[SwitchA] acl ipv6 basic 2000
[SwitchA-acl-ipv6-basic-2000] rule permit source ff3e:: 64
[SwitchA-acl-ipv6-basic-2000] quit
[SwitchA] ipv6 pim
[SwitchA-pim6] ssm-policy 2000
[SwitchA-pim6] quit

Configure the IPv6 SSM group range on Switch B, Switch C, Switch D, and Switch E in the same way Switch B is configured. (Details not shown.)

Verifying the configuration

# Display IPv6 PIM information on Switch A.

[SwitchA] display ipv6 pim interface
 Interface             NbrCnt HelloInt   DR-Pri   DR-Address
 Vlan101               1      30         1        FE80::A01:201:2
 Vlan102               1      30         1        FE80::A01:201:3

# Send an MLDv2 report from Host A to join the IPv6 multicast source and group (4001::100/64, FF3E::101). (Details not shown.)

# Display IPv6 PIM multicast routing table information on Switch A.

[SwitchA] display ipv6 pim routing-table
 Total 0 (*, G) entry; 1 (S, G) entry

 (4001::100, FF3E::101)
     Protocol: pim-ssm, Flag: ACT
     UpTime: 00:00:11
     Upstream interface: Vlan-interface101
         Upstream neighbor: 1002::2
         RPF prime neighbor: 1002::2
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Vlan-interface100
             Protocol: mld, UpTime: 00:00:11, Expires: 00:03:25

# Display IPv6 PIM multicast routing table information on Switch B.

[SwitchD] display ipv6 pim routing-table
 Total 0 (*, G) entry; 1 (S, G) entry  

 (4001::100, FF3E::101)
     Protocol: pim-ssm, Flag: LOC
     UpTime: 00:08:02
     Upstream interface: Vlan-interface300
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Vlan-interface105
             Protocol: pim-ssm, UpTime: 00:08:02, Expires: 00:03:25

The output shows that switches on the SPT path (Switch A and Switch D) have generated the correct (S, G) entries.

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