477
RPT cannot be established or a source cannot register 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 registration 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 cannot receive the advertisements from the C-RP and the
bootstrap messages of the BSR do 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.
Use the
display ipv6 routing-table
command to verify that routes to the RP and the BSR are
available on each router, and that a route between the RP and the BSR is available. 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 routers in the entire network have a unicast route to the RP.
2.
IPv6 PIM-SM needs the support of the RP and BSR. Use the
display pim ipv6 bsr-info
command to verify that the BSR information exists on each router, and then use the
display
pim ipv6 rp-info
command to verify that the RP information is correct on each router.
3.
Use the
display pim ipv6 neighbor
command to verify that normal neighboring relationships
have been established among the routers.
