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3. Troubleshooting Functional Failures in Operation
86
(2) last-hop-router check items
The table below shows the items to be checked when this system is the last-hop-router in the IPv6 PIM-SSM network
configuration.
Table 3-45: last-hop-router Check Items
7 Check to see if the unicast route to the multicast data sender
exists.
show ipv6 route
If the unicast route does not exist, see "3.10 IPv6 Unicast
Routing Communication Failure."
8 Confirm that PIM is running on the sending interface for the
unicast route to the multicast data sender.
show ipv6 pim interface
If IGMP is not running, check the configuration and set the
configuration to run PIM on the sending interface for the
unicast route.
9 Confirm that the PIM-SSM group addresses contain the relay
target group address, referring to the configuration.
show running-config
If the PIM-SSM group addresses do not contain the relay
target group address, correct the configuration.
10 Confirm that the multicast relay routing information exists.
show ipv6 mroute
If the multicast routing information does not exist, check the
setting of the downstream router.
11 Confirm that multicast routing information or multicast
forwarding entry does not exceed the upper limit.
Multicast routing information:
show ipv6 mroute
Multicast forwarding entry:
show ipv6 mcache
netstat multicast
When warning is output, confirm that unexpected multicast
routing information or unexpected multicast forwarding entry
has not been created. If much of the negative cache exists in
multicast forwarding entry, check to see if no terminal
transmitting unnecessary packets exist.
No. Troubleshooting Steps and Command Action
1 If the mode of multicast receiver is MLDv1/MLDv2
(EXCLUDE mode), confirm in the configuration that the use
of PIM-SSM in MLDv1/MLDv2 (EXCLUDE mode) is
designated (ipv6 mld ssm-map enable).
show running-config
If the use of PIM-SSM in MLDv1/MLDv2 (EXCLUDE
mode) is not designated, correct the configuration.
2 If the mode of multicast receiver is MLDv1/MLDv2
(EXCLUDE mode), confirm in the configuration that
cooperation with PIM-SSM in MLDv1/MLDv2 (EXCLUDE
mode) is set for the group address and source address to be
relayed by PIM-SSM (ipv6 mld ssm-map static).
show running-config
If cooperation with PIM-SSM in MLDv1/MLDv2
(EXCLUDE mode) is not designated, correct the
configuration.
3 Confirm that MLD is running on the interface connected to the
multicast receiver.
show ipv6 mld interface
If MLD is not running, check the configuration and set the
configuration to run MLD.
4 Confirm that MLD warning information is not displayed on
the interface connected to the multicast receiver.
show ipv6 mld interface
If displayed, take the action against the warning. For details
on the warning, see "Operation Commands."
5 Confirm that the multicast receiver participates in the relay
target group via MLD.
show ipv6 mld group
If the group does not participate in the relay target group,
check the setting of the multicast receiver.
6 Confirm that the source address is registered in the MLD group
information.
show ipv6 mld group
If the mode of multicast receiver is MLDv2 (INCLUDE
mode) and the source address is not registered, check the
multicast receiver. If the mode of multicast receiver is
MLDv1/MLDv2 (EXCLUDE mode), confirm in the
configuration that cooperation with PIM-SSM is set.
7 If there is an interface in which the relay target group
participates and PIM is running, confirm that this system is
DR.
show ipv6 pim interface
If this system is not DR, check DR of the relay target interface.
No. Troubleshooting Steps and Command Action