Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
86
(2) Items to check for last-hop-router
The following table shows the items to check when the Switch is used as
last-hop-router in an
IPv4 PIM-DM network configuration.
Table 3-36: Items to check for last-hop-router
(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
6 Check the PIM neighboring information.
show ip pim neighbor
If neighboring routers are not displayed, check the
following:
• Use the
show ip pim interface command to
make sure that PIM is running on the interface
connected with the neighboring routers.
• Check the settings of the neighboring routers.
7 Check whether the unicast route to the multicast data
sender exists.
show ip route
If the unicast route does not exist, see 3.8 IPv4 unicast
routing communication failures.
8 Make sure that PIM is running on the interface
connected to the next hop address to the multicast data
sender.
show ip pim interface
If PIM is not running, check and modify the
configuration so that PIM runs on the interface
connected to the next hop address to the multicast data
sender.
9 Make sure that multicast forwarding entries exist.
show ip mcache
If multicast forwarding entries do not exist, make sure
that multicast data has reached the upstream port. If
multicast data has not reached the upstream port, check
the settings of the multicast sender or upstream router.
10 Check whether multicast routing information exists.
show ip mroute
If multicast routing information does not exist, check
the downstream router settings.
No. Items to check and commands Action
1 Make sure that IGMP is running on the interface
connected to the multicast receivers.
show ip igmp interface
If IGMP is not running, check and modify the
configuration so that IGMP runs on the interface.
2 Make sure that the multicast receivers participate in the
forwarding target group through IGMP.
show ip igmp group
If a multicast receiver does not participate in the
forwarding target group, check the multicast receiver
settings.
3 Check whether IGMP snooping is set for the interface
on which the static group participation functionality is
used.
show igmp-snooping
If IGMP snooping is set, check the following:
• Check whether the multicast router port for IGMP
snooping is set for the destination port.
• See 3.6.4 Multicast forwarding by IGMP
snooping is not possible.
4 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.
No. Items to check and commands Action