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3. Troubleshooting Functional Failures in Operation
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(2) BSR check items
The table below shows the items to be checked when this system is BSR in the IPv4 PIM-SM network configuration.
4 Confirm in the configuration that suppression of protocol
packet and multicast packet relay through filtering, etc. is not
provided on the interface that allows PIM and IGMP to run.
show running-config
If suppression of protocol packet and multicast packet relay is
provided, correct the configuration.
5 Check the PIM neighboring information.
show ip pim neighbor
If the neighboring router is not displayed, check the following:
• Confirm that PIM is running on the interface connected to
the neighboring router using the show ip pim
interface command.
• Verify the settings of the neighboring router.
6 Check to see if the unicast route to the multicast data sender
exists.
show ip route
If the unicast route does not exist, see "3.7 IPv4 Unicast
Routing Communication Failure."
7 Confirm that PIM is running on the interface to the next hop
address for the multicast data sender.
show ip pim interface
If PIM is not running, check the configuration. Set PIM to run
on the interface connected to the next hop address for the
multicast data sender.
8 Confirm that the PIM-SSM group addresses do not contain the
relay target group address, referring to the configuration.
show running-config
If the PIM-SSM group addresses contain the relay target group
address, correct the configuration.
9 Confirm that BSR is determined. However, this confirmation
is not required if the rendezvous point for the relay target
group address is a static rendezvous point.
show ip pim bsr
If BSR is not determined, check to see if the unicast route to
BSR exists. If the unicast route does not exist, see "3.7 IPv4
Unicast Routing Communication Failure."
If the unicast route exists, check the BSR setting. If the BSR is
this system, see "(2)BSR check items."
10 Confirm that the rendezvous point is determined.
show ip pim rp-mapping
If the rendezvous point is not determined, check to see if the
unicast route to the rendezvous point exists. If the unicast
route does not exist, see "3.7 IPv4 Unicast Routing
Communication Failure."
If the unicast route exists, check the rendezvous point setting.
If the rendezvous point is this system, see "(3)Rendezvous
point router check items."
11 Confirm that the rendezvous point group addresses contain the
relay target group address.
show ip pim rp-mapping
If the relay target group address is not contained, check the
rendezvous point setting. If the rendezvous point is this
system, see "(3)Rendezvous point router check items."
12 Confirm that the multicast relay entry exists.
show ip mcache
If the multicast relay entry does not exist, confirm that
multicast data has arrived at the upstream port. If multicast
data has not arrived, check the setting of the multicast sender
or upstream router.
13 Confirm that the multicast relay routing information exists.
show ip mroute
If the multicast routing information does not exist, check the
setting of the downstream router.
14 Check to see if multicast routing information or multicast
forwarding entry exceeds the upper limit.
Multicast routing information:
show ip mroute
Multicast forwarding entry:
show ip mcache
netstat multicast
When warning is output, confirm that unexpected multicast
routing information or unexpected multicast forwarding entry
has not been created. If much of the negative cache exists in
multicast forwarding entry, confirm that there is no terminal
transmitting unnecessary packets.
No. Troubleshooting Steps and Command Action