HP VPN Firewall Appliances Network Management Configuration Guide

904
Upstream neighbor: 1002::2
RPF prime neighbor: 1002::2
Downstream interface(s) information:
Total number of downstreams: 1
1: GigabitEthernet0/1
Protocol: mld, UpTime: 00:00:11, Expires: 00:03:25
# Display IPv6 PIM multicast routing table information on Router C.
[RouterC] display pim ipv6 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: Ethernet1/1
Upstream neighbor: NULL
RPF prime neighbor: NULL
Downstream interface(s) information:
Total number of downstreams: 1
1: Ethernet1/2
Protocol: pim-ssm, UpTime: 00:08:02, Expires: 00:03:25
Troubleshooting IPv6 PIM
This section describes common IPv6 PIM problems and how to troubleshoot them.
A multicast distribution tree cannot be built correctly
Symptom
None of the routers in the network (including routers directly connected with IPv6 multicast sources or
receivers) have multicast forwarding entries. In other words, an IPv6 multicast distribution tree cannot be
correctly built and the receivers cannot receive IPv6 multicast data.
Analysis
• An IPv6 PIM routing entry is created based on an IPv6 unicast route, whichever IPv6 PIM mode is
running. Multicast works only when unicast does.
• IPv6 PIM must be enabled on the RPF interface. An RPF neighbor must be an IPv6 PIM neighbor as
well. If IPv6 PIM is not enabled on the RPF interface or the RPF neighbor, the establishment of a
multicast distribution tree will surely fail, resulting in abnormal multicast forwarding.
• IPv6 PIM requires that the same IPv6 PIM mode (namely, DM or SM) must run on the entire network.
Otherwise, the establishment of a multicast distribution tree will surely fail, resulting in abnormal
multicast forwarding.
Solution
1. Use the display ipv6 routing-table command to verify that a unicast route to the IPv6 multicast
source or the RP is available.