4000 Router Series IP Multicast Configuration Guide

Troubleshooting IGMP snooping

Layer 2 multicast forwarding cannot function

Symptom

Layer 2 multicast forwarding cannot function on the switch.

Analysis

IGMP snooping is not enabled.

Solution

1. Use the display igmp-snooping command to display IGMP snooping status.

2. If IGMP snooping is not enabled, use the igmp-snooping command in system view to enable IGMP

snooping globally, and then use the igmp-snooping enable command in VLAN view to enable

IGMP snooping for the VLAN.

3. If IGMP snooping is enabled globally but not enabled for the VLAN, use the igmp-snooping enable

command in VLAN view to enable IGMP snooping for the VLAN.