Troubleshooting Ipv6 Pim Configuration; Failure Of Building A Multicast Distribution Tree Correctly - HP A6600 Configuration Manual

RPF prime neighbor: 1002::2
Downstream interface(s) information:
Total number of downstreams: 1
1: GigabitEthernet1/0/1
The information on Router B and Router C is similar to that on Router A.
# View the IPv6 PIM multicast routing table information on Router D.
[RouterD] 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: GigabitEthernet1/0/1
Upstream neighbor: NULL
RPF prime neighbor: NULL
Downstream interface(s) information:
Total number of downstreams: 1
1: Serial2/0/0

Troubleshooting IPv6 PIM configuration

Failure of building a multicast distribution tree correctly

Symptom
None of the routers in the network (including routers directly connected with IPv6 multicast sources and
receivers) has IPv6 multicast forwarding entries. That is, a multicast distribution tree cannot be built
correctly and clients 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
Check IPv6 unicast routes. Use display ipv6 routing-table to check whether a unicast route exists to
1.
the IPv6 multicast source or the RP.
Check that the RPF interface is IPv6 PIM enabled. Use display pim ipv6 interface to view the IPv6 PIM
2.
information on each interface. If IPv6 PIM is not enabled on the interface, use pim ipv6 dm or pim
ipv6 sm to enable IPv6 PIM.
Protocol: mld, UpTime: 00:00:11, Expires: 00:03:25
Protocol: pim-ssm, UpTime: 00:08:02, Expires: 00:03:25
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