Troubleshooting Igmp Snooping; Layer 2 Multicast Forwarding Cannot Function; Multicast Group Policy Does Not Work - HP FlexFabric 5700 Series Configuration Manual

Sent IGMPv3 specific sg queries:
Received PIMv2 hello:
Received error IGMP messages:
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 switch.
Analysis
IGMP snooping is not enabled.
Solution
To resolve the problem:
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.
4. If the problem persists, contact HP Support.

Multicast group policy does not work

Symptom
Hosts can receive multicast data from multicast groups that are not permitted by the multicast group
policy.
Analysis
Possible reasons for the problem might include the following:
The ACL is incorrectly configured.
•
The multicast group policy is not correctly applied.
•
• Dropping unknown multicast data is not enabled, so unknown multicast data is flooded.
Solution
To resolve the problem:
1. Use the display acl command to verify that the configured ACL meets the multicast group policy
requirements.
2. Use the display this command in IGMP-snooping view or in an interface view to verify that the
correct multicast group policy has been applied. If not, use the group-policy or igmp-snooping
group-policy command to apply the correct multicast group policy.
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