NEC IP8800/S3600, IP8800/S6600 manual Multicast Data Is Double-relayed on IPv6 PIM-SM Network

3.Troubleshooting Functional Failures in Operation

No.	Troubleshooting Steps and Command	Action
4	Confirm that MLD snooping is set to the interface with PIM	When MLD snooping is set, confirm the following:
	enabled.	• Confirm that multicast router port for MLD snooping is set
	show mld-snooping	to the forwarding port.
		• See "3.5.5 Multicast Relay by MLD snooping Is Disabled."
5	Confirm that no interface in abnormal state is detected.	See notices and confirm that warning information is not
	show ipv6 mld interface	output. When warning infromation is output, check the
		following:
		• L: The number of join request exceeded expected
		maximum number. Check to see the number of connected
		users.
		• Q: The MLD version of neighboring router is different.
		Adjust it to the MLD version.
		• R: A user who transmitted reports unreceivable at the
		present settings exists. Change the MLD version of this
		system or confirm the setting of the participant.
		• S: Some of the participant information are being discarded
		because the number of source exceeded the upper limit
		defined to store source per message in MLDv2. Check the
		settings of the participant.

(5) first-hop-router check items

The table below shows the items to be checked when this system is the first-hop-router in the IPv6 PIM-SM network configuration.

Table 3-42: first-hop-router Check Items

No.	Troubleshooting Steps and Command	Action
1	Confirm that this system is directly connected to the multicast	If not, check the network configuration.
	sender.
2	Confirm that PIM or MLD is running on the interface	If not running, check the configuration and set the
	connected to the multicast sender.	configuration to run PIM or MLD.
	show ipv6 pim interface
	show ipv6 mld interface
3	Confirm that the multicast relay routing information exists.	If the multicast routing information does not exist, confirm
	show ipv6 mroute	that multicast data source address is the network address of
		the interface directly connected to the multicast sender.

3.11.2Multicast Data Is Double-relayed on IPv6 PIM-SM Network

If multicast data is double-relayed in the IPv6 PIM-SM network configuration, check the settings of each router and set the configuration to run PIM on the interface for a network having multiple routers.

If double-relay still continues, check the following:

Table 3-43: Check Items When Double-relay Continues

No.	Troubleshooting Steps and Command	Action
1	Check the PIM neighboring information on the interface of the	If the neighboring router is not displayed, check the
	network having multiple routers.	following:
	show ipv6 pim neighbor	• Confirm that PIM is running on the interface connected to
		the neighboring router using the show ipv6 pim
		command with "interface" parameter specified.
		• Confirm in the configuration that suppression of protocol
		packet relay by filtering, etc. is not provided.
		• Verify the settings of the neighboring router.

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