Rps Unable To Join Spt In Ipv6 Pim-Sm - 3Com MSR 50 Series Configuration Manual

1276 C 74: IP 6 PIM C
HAPTER V
RPs Unable to Join SPT in
IPv6 PIM-SM
ONFIGURATION
IPv6 PIM requires that the same IPv6 PIM mode, namely DM or SM, must run
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on the entire network. Otherwise, the establishment of a multicast distribution
tree will surely fail, resulting in abnormal multicast forwarding.
Solution
1 Check IPv6 unicast routes. Use the display ipv6 routing-table command to
check whether a unicast route exist to the IPv6 multicast source or the RP.
2 Check that the RPF interface supports IPv6 PIM. Use the display pim ipv6
interface command to view the IPv6 PIM information on each interface. If IPv6
PIM is not enabled on the interface, use the pim ipv6 dm or pim ipv6 sm
command to enable IPv6 PIM.
3 Check that the RPF neighbor is an IPv6 PIM neighbor. Use the display pim ipv6
neighbor command to view the PIM neighbor information.
4 Check that IPv6 PIM and MLD are enabled on the interfaces directly connecting to
the IPv6 multicast source and to the receiver.
5 Check that the same IPv6 PIM mode is enabled on related interfaces. Use the
display pim ipv6 interface verbose command to check whether the same PIM
mode is enabled on the RPF interface and the corresponding interface of the RPF
neighbor router.
6 Check that the same IPv6 PIM mode is enabled on all the routers in the entire
network. Use the display current-configuration command to check the IPv6
PIM mode information on each interface. Make sure that the same IPv6 PIM mode
is enabled on all the routers: IPv6 PIM-SM on all routers, or IPv6 PIM-DM on all
routers.
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
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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
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configured on all the routers in the entire network, including static RPs, by
means of the static RP command. Otherwise, IPv6 multicast will fail.
Solution
1 Check that a route is available to the RP. Carry out the display ipv6
routing-table command to check whether a route is available on each router to
the RP.
2 Check the dynamic RP information. Use the display pim ipv6 rp-info command
to check whether the RP information is consistent on all routers. In the case of
inconsistent RP information, configure consistent RP address on all the routers.
3 Check the static RP configuration. Carry out the display pim ipv6 rp-info
command to check whether the same RP address has been configured on all the
routers throughout the network.