NEC IP8800/S6600, IP8800/S3600, IP8800/S2400, IP8800/S6700, IP8800/S6300 last-hop-router Check Items

3.Troubleshooting Functional Failures in Operation

No.	Troubleshooting Steps and Command	Action
3	Confirm that IGMP snooping is set to the interface with PIM	When the IGMP snooping is set, confirm the following:
	enabled.	• The port to which neighboring router connected is set as a
	show igmp-snooping	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	If suppression of protocol packet and multicast packet relay is
	packet and multicast packet relay through filtering, etc. is not	provided, correct the configuration.
	provided on the interface that allows PIM and IGMP to run.
	show running-config
5	Check the PIM neighboring information.	If the neighboring router is not displayed, check the
	show ip pim neighbor	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	If the unicast route does not exist, see "3.7 IPv4 Unicast
	exists.	Routing Communication Failure."
	show ip route
7	Confirm that PIM is running on the sending interface for the	If IGMP is not running, check the configuration and set the
	unicast route to the multicast data sender.	configuration to run PIM on the sending interface for the
	show ip pim interface	unicast route.
8	Confirm that the PIM-SSM group addresses contain the relay	If the PIM-SSM group addresses do not contain the relay
	target group address, referring to the configuration.	target group address, correct the configuration.
	show running-config
9	Confirm that the multicast relay routing information exists.	If the multicast routing information does not exist, check the
	show ip mroute	setting of the downstream router.
10	Confirm that multicast routing information or multicast	When warning is output, confirm that unexpected multicast
	forwarding entry does not exceed the upper limit.	routing information or unexpected multicast forwarding entry
	Multicast routing information:	has not been created. If much of the negative cache exists in
	show ip mroute	multicast forwarding entry, confirm that there is no terminal
	multicast forwarding entry:	transmitting unnecessary packets.
	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	Action
1	Confirm that the use of PIM-SSM cooperation in IGMPv1/	If the use of PIM-SSM cooperation in IGMPv1/IGMPv2 is
	IGMPv2 is designated (ip igmp ssm-map enable) in the	not designated, correct the configuration.
	configuration.
	show running-config
2	Confirm in the configuration that PIM-SSM cooperation in	If PIM-SSM cooperation in IGMPv1/IGMPv2 is not set,
	IGMPv1/IGMPv2 is set (ip igmp ssm-map static) for the group	correct the configuration.
	address and source address to be relayed by PIM-SSM.
	show running-config
3	Confirm that IGMP is running on the interface connected to	If IGMP is not running, check the configuration and set the
	the multicast receiver.	configuration to run IGMP.
	show ip igmp interface
4	Confirm that the multicast receiver participates in the relay	If the group does not participate in the relay target group,
	target group via IGMP.	check the setting of the multicast receiver.
	show ip igmp group

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