Troubleshooting PIM Configuration 671
Solution
1 Check the multicast forwarding boundary configuration. Use the display
current-configuration command to check the multicast forwarding boundary
settings. Use the multicast boundary command to change the multicast
forwarding boundary settings.
2 Check the multicast filter configuration. Use the display current-configuration
command to check the multicast filter configuration. Change the ACL rule defined
in the source-policy command so that the source/group address of the multicast
data can pass ACL filtering.
RPs Unable to Join SPT in
PIM-SM
Symptom
An RPT cannot be established correctly, or the RPs cannot join the SPT to the
multicast source.
Analysis
■ As the core of a PIM-SM domain, the RPs serve specific multicast groups.
Multiple RPs can coexist in a network. Make sure that the RP information on all
routers is exactly the same, and a specific group is mapped to the same RP.
Otherwise, multicast forwarding will fail.
■ 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 Check that a route is available to the RP. Carry out the display ip routing-table
command to check whether a route is available on each router to the RP.
2 Check the dynamic RP information. Use the display pim rp-info command to
check whether the RP information is consistent on all routers.
3 Check the configuration of static RPs. Use the display pim rp-info command to
check whether the same static RP address has been configured on all the routers in
the entire network.
No Unicast Route
Between BSR and C-RPs
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.
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