F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

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797BRPs cannot join SPT in PIM-SM
1636BSymptom
An RPT cannot be established correctly, or the RPs cannot join the SPT to the multicast source.
1637BAnalysis
• As the core of a PIM-SM domain, the RPs serve specific multicast groups. Multiple RPs can coexist
in a network. Make sure the RP information on all routers is exactly the same and that a specific
group is mapped to the same RP. Otherwise, multicast forwarding fails.
• 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 fails.
1638BSolution
1. Use the display ip routing-table command to verify that a route to the RP is available on each
router.
2. Use the display pim rp-info command to verify that the dynamic 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.
798BRPT establishment failure or source registration failure in
PIM-SM
1639BSymptom
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.
1640BAnalysis
• 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 messages
of the BSR do not contain the information of that C-RP.
• In addition, if the BSR does not have a unicast route to a C-RP, it discards the C-RP-Adv messages
from that C-RP. Therefore, the bootstrap messages of the BSR do not contain the information of that
C-RP.
• The RP is the core of a PIM-SM domain. Make sure 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.
1641BSolution
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 between the RP and the BSR is available. Make sure 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 exists on each router, and then use the display pim rp-info command to verify
that the RP information is correct on each router.