H3C Technologies H3C S12500 Series Switches - Manual (Page 200)

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An RPT cannot be established or a source cannot register 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 register 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 router 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 to the RP and the BSR are available
on each router, and that 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
check whether the RP information is correct.
3. Use the display pim neighbor command to verify that normal PIM neighboring relationships have
been established among the routers.