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IGMP Snooping 129
Example: IGMP Snooping Configuration
To implement IGMP Snooping on the switch, first enable it. The switch is
connected with the router through the router port, and with user PC through the
non-router ports.
Figure 31 IGMP Snooping Configuration Network
1 Display the status of GMRP.
<SW7750>display gmrp status
2 Display the current status of IGMP Snooping when GMRP is disabled.
<SW7750>display igmp-snooping configuration
3 Enable IGMP Snooping if it is disabled.
[SW7750]igmp-snooping enable
Troubleshooting IGMP
Snooping
If the multicast function cannot be implemented on the switch, check for the
following conditions and use the accompanying troubleshooting procedure:
1 IGMP Snooping is disabled.
■ Input the display current-configuration command to display the status of
IGMP Snooping.
■ If the switch disabled IGMP Snooping, you can input igmp-snooping enable
in the system view to enable IGMP Snooping.
2 Multicast forwarding table set up by IGMP Snooping is wrong.
Enable/disable IGMP Snooping debugging
(abnormal, group, packet, timer).
debug igmp-snooping { all |
abnormal | group | packet |
timers }
Disable IGMP Snooping debugging (abnormal,
group, packet, timer).
undo debug igmp-snooping { all |
abnormal | group | packet |
timers }
Table 137 Display and Debug IGMP Snooping
Operation Command
Internet
A router running
IGMP
An Ethernet switch
running IGMP
snooping
IGMP packets
IGMP packets