NEC IP8800/S2400 User Manual
3.
Troubleshooting Functional Failures in Operation
81
3.11 IPv6 Multicast Routing Communication Failure
Actions to be taken if IPv6 multicast communication failures occur on this system are described below.
3.11.1
Communication 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.
analysis method below.
The figure below illustrates a network example of IPv6 PIM-SM.
Figure 3-16: Example of IPv6 PIM-SM Network
Note
• 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
• 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.
• 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
multicast routing) in the configuration.
show running-config
multicast routing) in the configuration.
show running-config
If the use of multicast function is not designated, correct the
configuration.
configuration.
2
Confirm that the address of the loopback interface is set in the
configuration.
show running-config
configuration.
show running-config
If the address of the loopback interface is not set, correct the
configuration.
configuration.
3
Confirm that PIM is running on one or more interfaces.
show ipv6 pim interface
show ipv6 pim interface
If PIM is not running, check the configuration. Set PIM to run
on one or more interfaces.
on one or more interfaces.
4
Confirm that MLD snooping is set to the interface with PIM
enabled.
show mld-snooping
enabled.
show mld-snooping
When MLD snooping is set, confirm the following:
• Confirm that multicast router port for MLD snooping is set
• Confirm that multicast router port for MLD snooping is set
to the port to which neighboring router connects.
• See "
Multicast
Multicast
Multicast
Multicast
Sender
Receiver
Receiver
data
Participation in
the MLD group
the MLD group
BSR and
rendezvous point router
first-hop-router
last-hop-router
Participation in
the MLD group
the MLD group