Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3 Make sure that PIM-SM is running on one or more
interfaces.
show ip pim interface
If PIM-SM is not running, check and modify the
configuration so that PIM-SM runs on at least one of
the interfaces.
If the configuration contains the setting for running
PIM on an interface, but the interface is not displayed
by the
show ip pim interface command, make sure
that multihoming is not set for the target interface.
4 Check whether IGMP snooping is set for the interface
on which PIM runs.
show igmp-snooping
If IGMP snooping is set, check the following:
• Check whether the multicast router port for IGMP
snooping is set for the port connected to the
neighboring router.
• See 3.6.4 Multicast forwarding by IGMP
snooping is not possible.
5 Make sure that the configuration does not contain
filtering or other settings that suppress forwarding of
protocol packets and multicast packets on the interface
on which PIM and IGMP run.
show running-config
If the configuration contains a setting that suppresses
forwarding of protocol packets and multicast packets,
modify the configuration. For details about the
procedure for checking the filter configuration
information, see 3.25.1 Checking the filters and QoS
configuration information.
6 Check the PIM neighboring information.
show ip pim neighbor
If neighboring routers are not displayed, check the
following:
• Use the
show ip pim interface command to
make sure that PIM-SM is running on the interface
connected with the neighboring routers.
• Check the settings of the neighboring routers.
7 Check whether the unicast route to the multicast data
sender exists.
show ip route
If the unicast route does not exist, see 3.8 IPv4 unicast
routing communication failures.
8 Make sure that PIM is running on the interface
connected to the next hop address to the multicast data
sender.
show ip pim interface
If PIM is not running, check and modify the
configuration so that PIM runs on the interface
connected to the next hop address to the multicast data
sender.
9 Check the configuration to make sure that the
PIM-SSM group addresses do not contain the
forwarding target group address.
show running-config
If the PIM-SSM group addresses contain the
forwarding target group address, modify the
configuration.
10 Make sure that BSR has been determined. This
checking is not required if the rendezvous point for the
forwarding target group address is a static rendezvous
point.
show ip pim bsr
If BSR has not been determined, check whether the
unicast route to BSR exists. If the unicast route does
not exist, see 3.8 IPv4 unicast routing communication
failures.
If the unicast route exists, check the BSR settings. If
the Switch is used as BSR, see (2) Items to check for
BSR.
11 Make sure that the rendezvous point has been
determined.
show ip pim rp-mapping
If the rendezvous point has not been determined, check
whether the unicast route to the rendezvous point
exists. If the unicast route does not exist, see 3.8 IPv4
unicast routing communication failures.
If the unicast route exists, check the rendezvous point
settings. If the Switch is used as the rendezvous point,
see (3) Items to check for the rendezvous point router.
12 Make sure that the rendezvous point group addresses
contain the forwarding target group address.
show ip pim rp-mapping
If the forwarding target group address is not contained,
check the rendezvous point router settings. If the
Switch is used as the rendezvous point, see (3) Items
to check for the rendezvous point router.
No. Items to check and commands Action