3Com MSR 50 Series, Configuration Manual

Page: 1277 / 2443

Troubleshooting IPv6 PIM Configuration 1277
No Unicast Route
Between BSR and C-RPs
in IPv6 PIM-SM Domain
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
1
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 router 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.
2
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 router, and then use the display pim ipv6
rp-info command to check whether the RP information is correct.
3
View the IPv6 PIM neighboring relationships. Use the display pim ipv6 neighbor
command to check whether the normal neighboring relationships have been
established among the routers.