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3. Troubleshooting Functional Failures in Operation
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3.11.3 Communication on IPv6 PIM-SSM Network Is Disabled
If multicast relay on the IPv6 PIN-SSM network configuration is disabled, isolate the cause according to the failure
analysis method below.
The figure below illustrates a network example of IPv6 PIM-SSM.
Figure 3-17: Example of IPv6 PIM-SSM Network
Note
• 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-SSM network configuration.
Table 3-44: 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
If the use of multicast function is not designated, correct the
configuration.
2 Confirm that the address of the loopback interface is set in the
configuration.
show running-config
If the address of the loopback interface is not set, correct the
configuration.
3 Confirm that PIM is running on one or more interfaces.
show ipv6 pim interface
If PIM is not running, check the configuration. Set PIM to run
on one or more interfaces.
4 Confirm that MLD snooping is set to the interface with PIM
enabled.
show mld-snooping
When MLD snooping is set, confirm the following:
• Confirm that multicast router port for MLD snooping is set
to the ports to which neighboring routers connect.
• See "3.5.5 Multicast Relay by MLD snooping Is Disabled."
5 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 MLD to run.
show running-config
If suppression of protocol packet and multicast packet relay is
provided, correct the configuration.
6 Check the PIM neighboring information.
show ipv6 pim neighbor
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 ipv6 pim
command with "interface" parameter specified.
• Verify the settings of the neighboring router.
Multicast
Multicast
Multicast
Multicast
sender
data
receiver
receiver
Participation in
the MLD group
last-hop-router
first-hop-router
Participation in
the MLD group