NEC IP8800/S2400 Series Troubleshooting Manual page 130

3.
Troubleshooting Functional Failures in Operation
No. Troubleshooting Steps and Command
3 Confirm that IGMP snooping is set to the interface with PIM
enabled.
show igmp-snooping
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
5 Check the PIM neighboring information.
show ip pim neighbor
6 Check to see if the unicast route to the multicast data sender
exists.
show ip route
7 Confirm that PIM is running on the sending interface for the
unicast route to the multicast data sender.
show ip pim interface
8 Confirm that the PIM-SSM group addresses contain the relay
target group address, referring to the configuration.
show running-config
9 Confirm that the multicast relay routing information exists.
show ip mroute
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
(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
No. Troubleshooting Steps and Command
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
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
3 Confirm that IGMP is running on the interface connected to
the multicast receiver.
show ip igmp interface
4 Confirm that the multicast receiver participates in the relay
target group via IGMP.
show ip igmp group
68
Action
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."
If suppression of protocol packet and multicast packet relay is
provided, correct the configuration.
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.
If the unicast route does not exist, see
Routing Communication Failure."
If IGMP is not running, check the configuration and set the
configuration to run PIM on the sending interface for the
unicast route.
If the PIM-SSM group addresses do not contain the relay
target group address, correct the configuration.
If the multicast routing information does not exist, check the
setting of the downstream router.
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.
Action
If the use of PIM-SSM cooperation in IGMPv1/IGMPv2 is
not designated, correct the configuration.
If PIM-SSM cooperation in IGMPv1/IGMPv2 is not set,
correct the configuration.
If IGMP is not running, check the configuration and set the
configuration to run IGMP.
If the group does not participate in the relay target group,
check the setting of the multicast receiver.
"3.7 IPv4 Unicast