NEC IP8800/S6700 manual 11 IPv6 Multicast Routing Communication Failure, Common Check Items

3. Troubleshooting Functional Failures in Operation

3.11 IPv6 Multicast Routing Communication Failure

Actions to be taken if IPv6 multicast communication failures occur on this system are described below.

3.11.1Communication on IPv6 PIM-SM Network Is Disabled

If multicast relay on the IPv6 PIN-SM network configuration is disabled, isolate the cause according to the failure analysis method below.

The figure below illustrates a network example of IPv6 PIM-SM.

Figure 3-16: Example of IPv6 PIM-SM Network

		Multicast
	BSR and
		Participation in
				Receiver
rendezvous point router
		the	MLD group

Multicast
Sender	first-hop-router

last-hop-router

Multicast

data

Note

Participation in the MLD group

Multicast

Receiver

•BSR: This router delivers rendezvous point information (for details, see the manual "Configuration Settings").

•Rendezvous point router: This router relays the packets, for which the relay destination is not determined, toward the multicast receiver (for details, see the manual "Configuration Settings").

•first-hop-router: This router is directly connected to the multicast sender.

•last-hop-router: This router is directly connected to the multicast receiver.

(1)Common check items

The table below shows the common check items for all system in the IPv6 PIM-SM network configuration.

Table 3-38: Common Check Items

No.	Troubleshooting Steps and Command	Action
1	Confirm that the use of multicast function is designated (ipv6	If the use of multicast function is not designated, correct the
	multicast routing) in the configuration.	configuration.
	show running-config
2	Confirm that the address of the loopback interface is set in the	If the address of the loopback interface is not set, correct the
	configuration.	configuration.
	show running-config
3	Confirm that PIM is running on one or more interfaces.	If PIM is not running, check the configuration. Set PIM to run
	show ipv6 pim interface	on one or more interfaces.
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 port to which neighboring router connects.
		• See "3.5.5 Multicast Relay by MLD snooping Is Disabled."

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