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3. Troubleshooting Functional Failures in Operation
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(5) 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-SM network
configuration.
Table 3-26: first-hop-router Check Items
3.8.2 Multicast Data Is Double-relayed on IPv4 PIM-SM Network
If multicast data is double-relayed in the IPv4 PIM-SM 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:
4 Check to see if IGMP snooping is set to the port in which static
group join function is working.
show igmp-snooping
When IGMP snooping is set, confirm the following:
• Confirm that relay port is set as multicast port for IGMP
snooping
• See "3.5.4 Multicast Relay by IGMP snooping Is
Disabled."
5 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 the maximum
number expected. Check to see the number of connected
users.
• Q: The IGMP version of neighboring router is different.
Adjust it to the same IGMP version.
• R: A user who transmitted reports unreceivable at the
present settings exists. Change the IGMP version of this
system or confirm the settings 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 Confirm that the multicast relay routing information exists.
show ip mroute
If the multicast routing information does not exist, confirm
that multicast data source address is the network address of
the interface directly connected to the multicast sender.
No. Troubleshooting Steps and Command Action