H3C Technologies H3C SecPath F1000-E - Manual (Page 224)

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RPs Unable to Join 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 the routers
in the entire network, including static RPs, by means of the static RP command. Otherwise, IPv6
multicast will fail.
Solution
Step1 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 device to the RP.
Step2 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.
Step3 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.
RPT Establishment Failure or Source Registration Failure in IPv6
PIM-SM
Symptom
C-RPs cannot unicast advertise messages to the BSR. The BSR does not advertise bootstrap messages
containing C-RP information and has no unicast route to any C-RP. An RPT cannot be established correctly,
or the DR cannot perform source register with the RP.
Analysis
• C-RPs periodically send advertisement messages to the BSR by unicast. If a C-RP does not have a
route to the BSR, the BSR will be unable to receive the advertisements from the C-RP, and therefore
the bootstrap messages of the BSR will not contain the information about that C-RP.
• The RP is the core of an IPv6 PIM-SM domain. Make sure that the RP information on all routers is
exactly the same, a specific group is mapped to the same RP, and a unicast route is available to the
RP.
Solution
Step1 Check whether routes to C-RPs, the RP and the BSR are available. Carry out the display ipv6
routing-table command to check whether routes are available on each device to the RP and the BSR,
and whether a route is available between the RP and the BSR. Make sure that each C-RP has a unicast
route to the BSR, the BSR has a unicast route to each C-RP, and all the routers in the entire network have
a unicast route to the RP.
Step2 Check the RP and BSR information. IPv6 PIM-SM needs the support of the RP and BSR. Use the display
pim ipv6 bsr-info command to check whether the BSR information is available on each device, and
then use the display pim ipv6 rp-info command to check whether the RP information is correct.