Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.6.4 Multicast forwarding by IGMP snooping is not possible
If multicast forwarding is not possible when IGMP snooping is used, use the following analysis
flowchart to determine the problem and isolate the cause.
8Use the show vlan detail
command to check the state of the
VLAN used for the Ring Protocol
and the VLAN port states.
If there is no anomaly in the states of the VLAN and its ports, go to No. 9.
Also, go to No. 10 for the configuration in which a Spanning Tree Protocol
or GSRP is used together with the Ring Protocol, and go to No. 11 for the
configuration in which the multi-fault monitoring functionality is applied.
If there is any anomaly, check the configuration and restore the states of the
VLAN and its ports.
9 Check the filters and QoS control
configurations.
The control frames used for the Ring Protocol might have been discarded
by filters and QoS control. See 3.25.1 Checking the filters and QoS
configuration information and check for a problem. Also, see the
Configuration Guide.
10 If a Spanning Tree Protocol or
GSRP is set to be used together
with the Ring Protocol, check the
virtual link settings.
Check whether the virtual link settings in the configuration are the same as
those defined in the network configuration.
• Check whether the virtual link is set for devices that use a Spanning
Tree Protocol or GSRP together with the Ring Protocol.
• For devices in the entire ring network, check whether the VLANs used
in the virtual link are included in the VLAN group for the Ring
Protocol.
11 If the multi-fault monitoring
functionality is applied, use the
show axrp detail command to
check the operating mode for the
multi-fault monitoring
functionality.
If shared nodes have
monitor-enable configured and other devices have
transport-only configured, go to No. 12.
If any other information is displayed, check the configuration.
12 Use the show axrp detail
command to check the backup ring
IDs and VLAN IDs for the
multi-fault monitoring
functionality.
If the backup ring ID and the VLAN ID for the multi-fault monitoring
functionality defined in the network configuration are displayed for
Backup Ring ID and Control VLAN ID, go to No. 13.
If any other information is displayed, check the configuration.
13 Use the
show axrp detail
command to check the timer value
of the multi-fault monitoring
functionality frame sending
interval and that of the hold time to
determine that multiple faults have
occurred when multi-fault
monitoring frames are not
received.
Make sure that the
Multi Fault Detection Hold Time timer value is
larger than the Multi Fault Detection Interval timer value (i.e.,
transmission delay is taken into account).
If any other information is displayed, check the configuration.
No. Items to check and
commands
Action