igmp send-router-alert

Hi Rengar,

The igmp send-router-alert command configures an interface to send IGMP messages containing the Router-Alert option in IP headers.

By default, the switch sends IGMP messages that contain the Router-Alert option in IP headers. If the switch needs to communicate with a device that does not support the Router-Alert option, run the undo igmp send-router-alert command to configure the switch to send IGMP messages without the Router-Alert option. The igmp send-router-alert command is usually used together with the igmp require-router-alert command.

For more information, you can refer to igmp send-router-alert.

Hi, friend!

Router-Alert is a special mechanism for identifying protocol packets. If a packet carries the Router-alert option, the packet needs to be sent to the routing protocol layer for processing. When a multicast device receives an IGMP packet without the Route-Alert option, the multicast device sends the packet to the routing protocol layer for processing regardless of whether the Route-Alert option is configured. If the Router-Alert option is configured, only IGMP packets with the Route-Alert option are sent to the routing protocol layer for processing. By default, the device carries this field. To communicate with a device that does not support the Router-Alert option, run the undo igmp send-router-alert command to disable the Router-Alert option from being carried in the header of IGMP packets. The igmp require-router-alert command is usually used together with the igmp require-router-alert command.