Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
82
(3) Items to check for first-hop-router
The following table shows the items to check when the Switch is used as
first-hop-router in an
IPv4 PIM-SSM network configuration.
Table 3-31: Items to check for first-hop-router
3.9.4 Multicast data is forwarded twice in the IPv4 PIM-SSM network
If multicast data is forwarded twice in an IPv4 PIM-SSM network configuration, check the settings
of each router and if multiple routers exist in one network, modify the settings so that PIM-SM runs
on the interface in the network.
The following table shows the items to check when data continues to be forwarded twice even after
you have checked and modified the settings as described above.
7 Check whether any anomaly has been detected on any
interface.
show ip igmp interface
Make sure that no warning information is displayed for
Notice.
If warning information is displayed, check the
following:
•
L: More participation requests than the expected
maximum number have occurred. Check the
number of connected users.
•
Q: The IGMP version is different from that on the
neighboring router. Use the same IGMP version.
•
R: A user is sending a report that cannot be
received with the current settings. Change the
IGMP version on the Switch, or check the settings
of the participation user.
•
S: Parts of the participation information have been
discarded because the number of sources stored in
a message exceeds the maximum number for
IGMPv3. Check the settings of the participation
user.
No. Items to check and commands Action
1 Make sure that the Switch is directly connected to the
multicast sender.
If the Switch is not connected directly, check the
network configuration.
2 Make sure that PIM-SM or IGMP is running on the
interface connected to the multicast sender.
show ip pim interface
show ip igmp interface
If PIM-SM or IGMP is not running, check and modify
the configuration so that PIM-SM or IGMP runs on the
interface.
3 Check whether multicast data has reached the Switch. If the multicast data has not reached the Switch, check
the settings of the multicast sender.
4 Check whether the group address and source address
are the same between multicast data and multicast
routing information.
show ip mroute
show netstat multicast
If the different group address and source address are
used, check the settings of the multicast sender and
last-hop-router.
No. Items to check and commands Action