Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
81
(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-SSM network configuration.
Table 3-30: Items to check for last-hop-router
9 Check the configuration to make sure that the
PIM-SSM group addresses contain the forwarding
target group address.
show running-config
If the PIM-SSM group addresses do not contain the
forwarding target group address, modify the
configuration.
10 Check whether multicast routing information exists.
show ip mroute
If multicast routing information does not exist, check
the downstream router settings.
11 Check whether the number of the multicast routing
information entries or multicast forwarding entries
exceeds its upper limit.
For the multicast routing information:
show ip mroute
For the multicast forwarding entries:
show ip mcache
netstat multicast
If a warning is displayed, check whether an
unexpected multicast routing information entry or
unexpected multicast forwarding entry has been
created. If many negative caches are found among the
multicast forwarding entries, check whether there is a
terminal that is sending unnecessary packets.
No. Items to check and commands Action
1 Make sure that the configuration contains the setting
(
ip igmp ssm-map enable) to enable the PIM-SSM
linkage operation in IGMPv1 and IGMPv2.
show running-config
If the configuration does not contain the setting to
enable the PIM-SSM linkage operation in IGMPv1
and IGMPv2, modify the configuration.
2 Make sure that the configuration contains the setting
(
ip igmp ssm-map static) to enable the group
address and source address forwarded via PIM-SSM to
work with PIM-SSM in IGMPv1 and IGMPv2.
show running-config
If the configuration does not contain the setting to
enable the linkage operation with PIM-SSM in
IGMPv1 and IGMPv2, modify the configuration.
3 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.
4 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.
5 If the interface in which the forwarding target group
participates exists, make sure that the Switch is DR.
show ip pim interface
If the Switch is not DR, check the DR of the
forwarding target interface.
6 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.
No. Items to check and commands Action