Multicast Data Is Abnormally Terminated On An Intermediate Router; An Rp Cannot Join An Spt In Pim-Sm - HP 5920 series Configuration Manual

of the router's RPF neighbor operate in different PIM modes, the multicast distribution tree cannot be
built correctly, causing abnormal multicast forwarding.
The same PIM mode must run on the entire network. Otherwise, the multicast distribution tree cannot
•
be built correctly, causing abnormal multicast forwarding.
Solution
Use display ip routing-table to verify that a unicast route to the multicast source or the RP is
1.
available.
Use display pim interface to verify PIM information on each interface, especially on the RPF
2.
interface. If PIM is not enabled on the interfaces, use pim dm or pim sm to enable PIM-DM or
PIM-SM for the interfaces.
Use display pim neighbor to verify that the RPF neighbor is a PIM neighbor.
3.
Verify that PIM and IGMP are enabled on the interfaces that directly connect to the multicast
4.
sources or the receivers.
Use display pim interface verbose to verify that the same PIM mode is enabled on the RPF interface
5.
on a router and the connected interface of the router's RPF neighbor.
Use display current-configuration to verify that the same PIM mode is enabled on all routers. For
6.
PIM-SM, verify that the BSR and C-RPs are correctly configured.
Multicast data is abnormally terminated on an intermediate
router
Symptom
An intermediate router can receive multicast data successfully, but the data cannot reach the last-hop
router. An interface on the intermediate router receives multicast data but does not create an (S, G) entry
in the PIM routing table.
Analysis
• If a multicast forwarding boundary has been configured through the multicast boundary command,
and the multicast packets are kept from crossing the boundary, PIM cannot create routing entries for
the packets.
If an ACL is defined by the source-policy command, and the multicast packets cannot match the
•
ACL rule, PIM cannot create the routing entries for the packets.
Solution
Use display current-configuration to verify the multicast forwarding boundary settings. Use
1.
multicast boundary to change the multicast forwarding boundary settings to make the multicast
packet able to cross the boundary.
Use display current-configuration to verify the multicast data filter. Change the ACL rule defined in
2.
the source-policy command so that the source/group address of the multicast data can pass ACL
filtering.

An RP cannot join an SPT in PIM-SM

Symptom
An RPT cannot be correctly built, or an RP cannot join the SPT toward the multicast source.
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