HP MSR2000/3000/4000 Router Series IP Multicast Configuration Guide

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• The same IPv6 PIM mode must run on the entire network. Otherwise, the multicast distribution tree
cannot be correctly built, causing abnormal multicast forwarding.
Solution
1. Use display ipv6 routing-table to verify that an IPv6 unicast route to the IPv6 multicast source or the
RP is available.
2. Use display ipv6 pim interface to verify IPv6 PIM information on each interface, especially on the
RPF interface. If IPv6 PIM is not enabled on the interfaces, use ipv6 pim dm or ipv6 pim sm to
enable IPv6 PIM-DM or IPv6 PIM-SM for the interfaces.
3. Use display ipv6 pim neighbor to verify that the RPF neighbor is an IPv6 PIM neighbor.
4. Verify that IPv6 PIM and MLD are enabled on the interfaces that directly connect to the IPv6
multicast sources or the receivers.
5. Use display ipv6 pim interface verbose to verify that the same IPv6 PIM mode is enabled on the RPF
interface on a router and the connected interface of the router's RPF neighbor.
6. Use display current-configuration to verify that the same IPv6 PIM mode is enabled on all routers
on the network. For IPv6 PIM-SM, verify that the BSR and C-RPs are correctly configured.
IPv6 multicast data is abnormally terminated on an
intermediate router
Symptom
An intermediate router can receive IPv6 multicast data successfully, but the data cannot reach the
last-hop router. An interface on the intermediate router receives IPv6 multicast data but does not create
an (S, G) entry in the IPv6 PIM routing table.
Analysis
• If an IPv6 multicast forwarding boundary has been configured through the ipv6 multicast boundary
command, and the IPv6 multicast packets are kept from crossing the boundary, IPv6 PIM cannot
create routing entries for the packets.
• If an ACL is defined by the source-policy command, and the IPv6 multicast packets cannot match
the ACL rules, IPv6 PIM cannot create the routing entries for the packets.
Solution
1. Use display current-configuration to verify the IPv6 multicast forwarding boundary settings. Use
ipv6 multicast boundary to change the multicast forwarding boundary settings to make the IPv6
multicast packet able to cross the boundary.
2. Use display current-configuration to verify the IPv6 multicast data filter. Change the ACL rule
defined in the source-policy command so that the source/group address of the IPv6 multicast data
can pass ACL filtering.
An RP cannot join an SPT in IPv6 PIM-SM
Symptom
An RPT cannot be correctly built, or an RP cannot join the SPT toward the IPv6 multicast source.