38
[SwitchD-vlan100] igmp-snooping drop-unknown
[SwitchD-vlan100] quit
Verifying the configuration
# Display statistics for IGMP messages learned by IGMP snooping on Switch B.
[SwitchB] display igmp-snooping statistics
Received IGMP general queries: 3
Received IGMPv1 reports: 0
Received IGMPv2 reports: 12
Received IGMP leaves: 0
Received IGMPv2 specific queries: 0
Sent IGMPv2 specific queries: 0
Received IGMPv3 reports: 0
Received IGMPv3 reports with right and wrong records: 0
Received IGMPv3 specific queries: 0
Received IGMPv3 specific sg queries: 0
Sent IGMPv3 specific queries: 0
Sent IGMPv3 specific sg queries: 0
Received error IGMP messages: 0
The output shows that all switches except Switch A can receive the IGMP general queries after Switch A
acts as the IGMP snooping querier.
Troubleshooting IGMP snooping
Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function on the Layer 2 device.
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. 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.
4. If the problem persists, contact HP Support.
Multicast group filter does not work
Symptom
Hosts can receive multicast data from multicast groups that are not permitted by the multicast group filter.
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