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3. Troubleshooting Functional Failures in Operation
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Table 3-27: Check Items When Double-relay Continues
3.8.3 Communication on IPv4 PIM-SSM Network Is Disabled
If multicast relay on the IPv4 PIN-SSM network configuration is disabled, isolate the cause according to the failure
analysis method below.
The figure below illustrates a network example of IPv4 PIM-SSM.
Figure 3-12: Example of IPv4 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 IPv4 PIM-SSM network configuration.
Table 3-28: Common Check Items
No. Troubleshooting Steps and Command Action
1 Check the PIM neighboring information on the interface of the
network having multiple routers.
show ip 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 ip pim
interface command.
• Confirm in the configuration that suppression of protocol
packet relay by filtering, etc. is not provided.
• Verify the settings of the neighboring router.
No. Troubleshooting Steps and Command Action
1 Confirm that the use of multicast function is specified (ip
multicast routing) in the configuration.
show running-config
If the use of multicast function is not designated, correct the
configuration.
2 Confirm that PIM is running on one or more interfaces.
show ip pim interface
If PIM is not running, check the configuration. Set PIM to run
on one or more interfaces. If the interface set in the
configuration to run PIM is not displayed by the show ip
pim command with "interface" parameter specified, confirm
that multi-homing is not set on the interface.
Multicast
Multicast
Multicast
Multicast
sender
receiver
receiver
data
Participation in
the IGMP group
first-hop-router
last-hop-router
Participation in
the IGMP group