(Optional) Suppressing Report and Leave Messages
Context
IGMP periodically sends Query and Response messages to maintain group memberships. When multiple members join the same multicast group, they send a large number of identical Report messages to the IGMP router. When IGMPv2 or IGMPv3 hosts leave a multicast group, they send a large number of identical Leave messages. To conserve bandwidth, configure suppression for Report and Leave messages on the Layer 2 device.
After message suppression is configured, the switch forwards a Report message only when the first member joins a group or when it receives an IGMP Query message. The switch sends a Leave message only when the last member leaves the group.
Procedure
- Run system-view
The system view is displayed.
- Run vlan vlan-id
The VLAN view is displayed.
- Run igmp-snooping report-suppress
Report and Leave message suppression is configured.
When configuring message suppression, pay attention to the following points:
- After message suppression is configured in a VLAN, Layer 3 multicast functions (such as IGMP and PIM) cannot be enabled on the corresponding VLANIF interface.
- IGMP snooping proxy and message suppression cannot be configured in the same VLAN.
- If multicast VLAN replication is configured on the switch, the IGMP message suppression function cannot be enabled in user VLANs.
- The switch can suppress duplicate IGMPv1 or IGMPv2 Report messages even when IGMP message suppression is disabled. The default suppression time is 10 seconds. To change the suppression time, run the igmp-snooping suppress-time suppress-time command. If suppress-time is set to 0, all the membership report packets are forwarded immediately.