476
5.
Use the
display pim ipv6 interface verbose
command to verify that the same PIM mode is
enabled on the RPF interface and the corresponding interface of the RPF neighbor router.
6.
Use the
display current-configuration
command to verify the IPv6 PIM mode information on
each interface. Make sure that the same IPv6 PIM mode (IPv6 PIM-SM or IPv6 PIM-DM) is
enabled on all routers.
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 data but no corresponding (S, G)
entry is created in the IPv6 PIM routing table.
Analysis
•
If an IPv6 multicast forwarding boundary has been configured through the
multicast ipv6
boundary
command, any IPv6 multicast packet is kept from crossing the boundary, and
therefore no routing entry can be created in the IPv6 PIM routing table.
•
In addition, the
source-policy
command filters received IPv6 multicast packets. If the IPv6
multicast data fails to pass the IPV6 ACL rule defined in this command, IPv6 PIM cannot create
the route entry, either.
Solution
1.
Use the
display current-configuration
command to verify the IPv6 multicast forwarding
boundary settings. Use the
multicast ipv6 boundary
command to change the IPv6 multicast
forwarding boundary settings.
2.
Use the
display current-configuration
command to verify the IPv6 multicast filter
configuration. Change the IPv6 ACL rule defined in the
source-policy
command so that the
source/group address of the IPv6 multicast data can pass ACL filtering.
RPs cannot join the SPT in IPv6 PIM-SM
Symptom
An RPT cannot be established correctly, or the RPs cannot join the SPT to the IPv6 multicast source.
Analysis
•
As the core of an IPv6 PIM-SM domain, the RPs serves specific IPv6 multicast groups. Multiple
RPs can coexist in a network. Make sure that the RP information on all routers is exactly the
same, and a specific group is mapped to the same RP. Otherwise, IPv6 multicast will fail.
•
In the case of the static RP mechanism, the same RP address must be configured on all routers
in the entire network, including static RPs, by means of the static RP command. Otherwise,
IPv6 multicast will fail.
Solution
1.
Use the
display ipv6 routing-table
command to verify that a route to the RP is available on
each router.
2.
Use the
display pim ipv6 rp-info
command to verify that the dynamic RP information is
consistent on all routers. In case of inconsistent RP information, configure consistent RP
address on all routers.
3.
Use the
display pim ipv6 rp-info
command to verify that the same RP address has been
configured on all routers throughout the network.
