Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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(2) Items to check for BSR
The following table shows the items to check when the Switch is used as BSR in an IPv4 PIM-SM
network configuration.
Table 3-24: Items to check for BSR
(3) Items to check for the rendezvous point router
The following table shows the items to check when the Switch is used as a rendezvous point router
in an IPv4 PIM-SM network configuration.
Table 3-25: Items to check for the rendezvous point router
13 Make sure that multicast forwarding entries exist.
show ip mcache
If multicast forwarding entries do not exist, make sure
that multicast data has reached the upstream port. If
multicast data has not reached the upstream port, check
the settings of the multicast sender or upstream router.
14 Make sure that multicast routing information exists.
show ip mroute
If multicast routing information does not exist, check
the downstream router settings.
15 Check whether the number of the multicast routing
information entries or multicast forwarding entries
exceeds its upper limit.
For the multicast routing information:
show ip mroute
For the multicast forwarding entries:
show ip mcache
netstat multicast
If a warning is displayed, check whether an unexpected
multicast routing information entry or unexpected
multicast forwarding entry has been created. If many
negative caches are found among the multicast
forwarding entries, check whether there is a terminal
that is sending unnecessary packets.
No. Items to check and commands Action
1 Make sure the Switch is a BSR candidate.
show ip pim bsr
If the Switch is not a BSR candidate, check and modify
the configuration so that the Switch can work as a BSR
candidate. If an address is not set for the loopback
interface, the Switch does not work as a BSR
candidate. Also make sure that a loopback interface
address is set.
2 Make sure the Switch is used as BSR.
show ip pim bsr
If the Switch is not used as BSR, check the priorities of
other BSR candidates. A larger value represents a
higher priority. If the priority is the same among BSR
candidates, the BSR candidate that has the highest
BSR address becomes BSR.
No. Items to check and commands Action
1 Make sure the Switch is a rendezvous point candidate
for the forwarding target group address.
show ip pim rp-mapping
If the Switch is not a rendezvous point candidate for
the forwarding target group address, check and modify
the configuration so that the Switch can work as a
rendezvous point candidate for the forwarding target
group address. If an address is not set for the loopback
interface, the Switch does not work as a rendezvous
point candidate. Also make sure that a loopback
interface address is set.
No. Items to check and commands Action