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3. Troubleshooting Functional Failures in Operation
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(2) last-hop-router check items
The table below shows the items to be checked when this system is the last-hop-router in the IPv4 PIM-SSM network
configuration.
Table 3-29: last-hop-router Check Items
3 Confirm that IGMP snooping is set to the interface with PIM
enabled.
show igmp-snooping
When the IGMP snooping is set, confirm the following:
• The port to which neighboring router connected is set as a
multicast router port for IGMP snooping.
• See "3.5.4 Multicast Relay by IGMP snooping Is
Disabled."
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 command
with "interface" parameter specified.
• 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 sending interface for the
unicast route to the multicast data sender.
show ip pim interface
If IGMP is not running, check the configuration and set the
configuration to run PIM on the sending interface for the
unicast route.
8 Confirm that the PIM-SSM group addresses contain the relay
target group address, referring to the configuration.
show running-config
If the PIM-SSM group addresses do not contain the relay
target group address, correct the configuration.
9 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.
10 Confirm that multicast routing information or multicast
forwarding entry does not exceed 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
1 Confirm that the use of PIM-SSM cooperation in IGMPv1/
IGMPv2 is designated (ip igmp ssm-map enable) in the
configuration.
show running-config
If the use of PIM-SSM cooperation in IGMPv1/IGMPv2 is
not designated, correct the configuration.
2 Confirm in the configuration that PIM-SSM cooperation in
IGMPv1/IGMPv2 is set (ip igmp ssm-map static) for the group
address and source address to be relayed by PIM-SSM.
show running-config
If PIM-SSM cooperation in IGMPv1/IGMPv2 is not set,
correct the configuration.
3 Confirm that IGMP is running on the interface connected to
the multicast receiver.
show ip igmp interface
If IGMP is not running, check the configuration and set the
configuration to run IGMP.
4 Confirm that the multicast receiver participates in the relay
target group via IGMP.
show ip igmp group
If the group does not participate in the relay target group,
check the setting of the multicast receiver.
No. Troubleshooting Steps and Command Action