Troubleshooting Guide

About this task
Multicast group trace tracks the data flow path of the multicast streams.
Procedure
1. Enter Privileged EXEC mode:
enable
2. Display the multicast group trace for an IGMP snoop-enabled interface:
show ip igmp snoop-trace [source {A.B.C.D}] [group {A.B.C.D}]
Example
Display the multicast group trace for an IGMP snoop-enabled interface:
Switch:1>enable
Switch:1#show ip igmp snoop-trace
================================================================================
Snoop Trace - GlobalRouter
================================================================================
GROUP SOURCE IN IN OUT OUT TYPE
ADDRESS ADDRESS VLAN PORT VLAN PORT
--------------------------------------------------------------------------------
232.10.12.17 200.0.15.53 1015 1/3 1015 1/35-1/40 ACCESS
232.10.12.20 200.0.15.53 1015 1/3 1015 1/35-1/40 ACCESS
232.10.12.19 200.0.15.53 1015 1/3 1015 1/35-1/40 ACCESS
232.10.12.18 200.0.15.53 1015 1/3 1015 1/35-1/40 ACCESS
Variable definitions
Use the data in the following table to use the show ip igmp snoop-trace command.
Table 49: Variable definitions
Variable Value
group {A.B.C.D} Specifies the group IP address in the format a.b.c.d.
source {A.B.C.D} Specifies the source IP address in the format a.b.c.d.
Job aid
The following table shows the field descriptions for the show ip igmp snoop-trace command.
Table 50: show ip igmp snoop-trace field descriptions
Field Description
GROUP ADDRESS Indicates the IP multicast group address for which this entry contains
information.
Table continues…
Viewing multicast group trace information for IGMP snoop
January 2017 Troubleshooting 271
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