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3. Troubleshooting Functional Failures in Operation
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(3) first-hop-router check items
The table below shows the items to be checked when this system is the first-hop-router in the IPv4 PIM-SSM network
configuration.
Table 3-30: first-hop-router Check Items
3.8.4 Multicast Data Is Double-relayed on IPv4 PIM-SSM Network
If multicast data is double-relayed in the IPv4 PIM-SSM 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:
5 If there is an interface in which the relay target group
participates, confirm that this system is DR.
show ip pim interface
If this system is not DR, check DR of the relay target interface.
6 Confirm that IGMP snooping is set to the interface with static
group join function enabled.
show igmp-snooping
When the IGMP snooping is set, confirm the following:
• Confirm that the relay port is set as a multicast router port
for IGMP snooping.
• See "3.5.4 Multicast Relay by IGMP snooping Is
Disabled."
7 Confirm that no interface in abnormal state is detected.
show ip igmp interface
See notices and confirm that warning information is not
output. When warning information 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 IGMP version of neighboring router is different.
Adjust it to the version of IGMP.
• R: A user who transmitted reports unreceivable at the
present settings exists. Change the IGMP 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 IGMPv3. Check the
settings of the participant.
No. Troubleshooting Steps and Command Action
1 Confirm that this system is directly connected to the multicast
sender.
If not, check the network configuration.
2 Confirm that PIM or IGMP is running on the interface
connected to the multicast sender.
show ip pim interface
show ip igmp interface
If PIM or IGMP is not running, check the configuration and
set the configuration to run PIM or IGMP.
3 Check to see if multicast data arrives at this system. If multicast data has not arrived, check the setting of the
multicast sender.
4 Check to see if the group address and source address in
multicast data match those in the multicast routing
information.
show ip mroute
show netstat multicast
If the group address and source address do not match, check
the settings of the multicast sender and last-hop-router.
No. Troubleshooting Steps and Command Action