210
• If the static RP mechanism is used, the same static RP command must be executed on all the routers
in the entire network. Otherwise, multicast forwarding will fail.
Solution
1. Use the display ip routing-table command to verify that a route is available on each router to the
RP.
2. Use the display pim rp-info command to verify that the RP information is consistent on all routers.
3. Use the display pim rp-info command to verify that the same static RP address has been configured
on all the routers in the entire network.
RPT establishment failure or source registration failure in
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
• The C-RPs periodically send C-RP-Adv messages to the BSR by unicast. If a C-RP has no unicast route
to the BSR, the BSR cannot receive C-RP-Adv messages from that C-RP and the bootstrap message
of the BSR will not contain the information of that C-RP.
• In addition, if the BSR does not have a unicast route to a C-RP, it will discard the C-RP-Adv messages
from that C-RP, and therefore the bootstrap messages of the BSR will not contain the information of
that C-RP.
• The RP is the core of a PIM-SM domain. Make sure that the RP information on all routers is exactly
the same, a specific group G is mapped to the same RP, and unicast routes are available to the RP.
Solution
1. Use the display ip routing-table command to verify that 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. PIM-SM needs the support of the RP and BSR. Use the display pim bsr-info command to verify that
the BSR information is available on each router, and then use the display pim rp-info command to
verify that the RP information is correct.
3. Use the display pim neighbor command to verify that the normal PIM neighboring relationships
have been established among the routers.
To Next Page
Loading...
Need help?
General