190
Solution
1.
Use the
display current-configuration
command to verify the multicast forwarding boundary
settings. Use the
multicast boundary
command to change the multicast forwarding boundary
settings.
2.
Use the
display current-configuration
command to verify 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 cannot 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
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
routers in the entire network. Otherwise, multicast forwarding fails.
Solution
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 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 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 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 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.
