373
1: Vlan-interface200
Protocol: mld, UpTime: 00:04:25, Expires: never
(1001::100, FF1E::101)
Protocol: pim-dm, Flag: ACT
UpTime: 00:06:14
Upstream interface: Tunnel0
Upstream neighbor: FE80::A01:101:1
RPF prime neighbor: FE80::A01:101:1
Downstream interface(s) information:
Total number of downstreams: 1
1: Vlan-interface200
Protocol: pim-dm, UpTime: 00:04:25, Expires: never
The output shows that Switch A is the RPF neighbor of Switch C and the IPv6 multicast data from
Switch A is delivered over a GRE tunnel to Switch C.
Troubleshooting IPv6 multicast policy
configuration
Abnormal termination of IPv6 multicast data
Symptom
•
A host sends an MLD report announcing its joining an IPv6 multicast group (G). However, no
member information about the IPv6 multicast group (G) exists on the intermediate router. The
intermediate router can receive IPv6 multicast packets successfully, but the packets cannot
reach the stub network.
•
The interface of the intermediate router receives the IPv6 multicast packets, but no
corresponding (S, G) entry exists in the IPv6 PIM routing table.
Analysis
•
The
multicast ipv6 boundary
command filters IPv6 multicast packets received on an interface.
If an IPv6 multicast packet fails to match the IPv6 ACL rule of this command, IPv6 PIM creates
no routing entry.
•
In addition, the
source-policy
command in IPv6 PIM filters received IPv6 multicast packets. If
an IPv6 multicast packet fails to match the IPv6 ACL rule of this command, IPv6 PIM does not
create a routing entry.
Solution
1.
Use the
display current-configuration
command to display the IPv6 ACL rule configured on
the multicast forwarding boundary. Change the IPv6 ACL rule used in the
multicast ipv6
boundary
command so that the source address of the IPv6 multicast packets and the IPv6
multicast group address can both match the IPv6 ACL rule.
2.
Use the
display current-configuration
command to verify the configuration of the IPv6
multicast filter, and change the IPv6 ACL rule used in the
source-policy
command so that the
source address of the IPv6 multicast packets and the IPv6 multicast group address can both
match the IPv6 ACL rule.