Configured Multicast Group Policy Fails To Take Effect; Processing Multicast Protocol Messages - HP A6600 Configuration Manual

Configured multicast group policy fails to take effect

Symptom
Although a multicast group policy has been configured to allow hosts to join specific multicast groups, the
hosts can still receive multicast data addressed to other multicast groups.
Analysis
The ACL rule is incorrectly configured.
•
The multicast group policy is not correctly applied.
•
The function of dropping unknown multicast data is not enabled, so unknown multicast data is
•
flooded.
Solution
Use display acl to check the configured ACL rule. Make sure that the ACL rule conforms to the
1.
multicast group policy to be implemented.
Use display this in IGMP-snooping view or in the corresponding interface view to check whether the
2.
correct multicast group policy has been applied. If not, use group-policy or igmp-snooping
group-policy to apply the correct multicast group policy.
Use display current-configuration to check whether the function of dropping unknown multicast data
3.
is enabled. If not, use drop-unknown or igmp-snooping drop-unknown to enable the function of
dropping unknown multicast data.

Processing multicast protocol messages

With Layer 3 multicast routing enabled, an IGMP snooping-enabled a switch processes multicast protocol
messages differently under different conditions. On an a switch that has been enabled with Layer-3
multicast routing, use display igmp group port-info to view Layer-2 port information. For more information
about this command, see IP Multicast Command Reference.
• With only IGMP enabled or with both IGMP and PIM re enabled:
The switch maintains dynamic member ports or dynamic router ports according to IGMP
packets.
The switch maintains dynamic router ports according to PIM hello packets.
With only PIM enabled:
•
The a switch broadcasts IGMP messages as unknown messages in the VLAN.
After receiving a PIM hello message, the router will maintain the corresponding dynamic router
port.
With IGMP disabled:
•
If PIM is disabled, the router deletes all its dynamic member ports and dynamic router ports.
If PIM is enabled, the router deletes only its dynamic member ports without deleting its dynamic
router ports.
• With PIM disabled:
If IGMP is disabled, the router deletes all its dynamic router ports.
If IGMP is enabled, the router maintains all its dynamic member ports and dynamic router ports.
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