Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
108
(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
IPv6 PIM-SSM network configuration.
Table 3-52: Items to check for last-hop-router
No. Items to check and commands Action
1 If the mode of the multicast receivers is MLDv1 or
MLDv2 (EXCLUDE mode), make sure that
ipv6 mld
ssm-map enable is set in the configuration. This
setting enables the use of PIM-SSM in MLDv1 or
MLDv2 (EXCLUDE mode).
show running-config
If the configuration does not contain the setting to
enable the use of PIM-SSM in MLDv1 or MLDv2
(EXCLUDE mode), modify the configuration.
2 If the mode of the multicast receivers is MLDv1 or
MLDv2 (EXCLUDE mode), make sure that
ipv6 mld
ssm-map static is set in the configuration. This
setting enables the linkage operation with PIM-SSM in
MLDv1 or MLDv2 (EXCLUDE mode) for the group
address and source address that are forwarded via
PIM-SSM.
show running-config
If the configuration does not contain the setting to
enable the linkage operation with PIM-SSM in
MLDv1 or MLDv2 (EXCLUDE mode), modify the
configuration.
3 Make sure that MLD is running on the interface
connected to the multicast receivers.
show ipv6 mld interface
If MLD is not running, check and modify the
configuration so that MLD runs on the interface.
4 Make sure that no MLD warning information is
displayed on the interface connected to the multicast
receivers.
show ipv6 mld interface
If any warning information is displayed, take action
according to the information. For details about the
contents of each warning, see the manual Operation
Command Reference.
5 Make sure that the multicast receivers participate in the
forwarding target group through MLD.
show ipv6 mld group
If a multicast receiver does not participate in the
forwarding target group, check the multicast receiver
settings.
6 Check whether the source address is registered in the
MLD group information.
show ipv6 mld group
If the mode of the multicast receivers is MLDv2
(INCLUDE mode) and the source address is not
registered, check the multicast receivers. If the mode
of the multicast receivers is MLDv1 or MLDv2
(EXCLUDE mode), make sure that the configuration
contains the setting to enable the linkage operation
with PIM-SSM.
7 If the interface in which the forwarding target group
participates exists and PIM runs, make sure that the
Switch is DR.
show ipv6 pim interface
If the Switch is not DR, check the DR of the
forwarding target interface.
8 Check whether MLD snooping is set for the interface
on which the static group participation functionality is
used.
show mld-snooping
If MLD snooping is set, check the following:
• Check whether the multicast router port for MLD
snooping is set for the destination port.
• See 3.6.5 Multicast forwarding by MLD snooping
is not possible.