Configuration support for manual and automatic link switchover mechanism on multichassis link aggregation interface

You can now configure a multichassis link aggregation (MC-LAG) interface in active-standby mode to automatically revert to a preferred node. In an MC-LAG topology with active-standby mode, a link switchover happens only if the active node goes down. With this configuration, you can trigger a link switchover to a preferred node even when the active node is available. To enable automatic link switchover for an multichassis link aggregation (mc-ae) interface, you must configure the switchover-mode revertive statement at the [edit interfaces aex aggregated-ether-options mc-ae] hierarchy level. You can also specify the revert time for the switchover by using the revert-time statement. To continue using the manual switchover mechanism, you must configure the switchover-mode non-revertive statement at the [edit interfaces aex aggregated-ether-options mc-ae] hierarchy level. For nonrevertive mode, you can configure manual switchover to the preferred node by using the switchover immediate and mc-ae-id statements at the [request interface mc-ae] hierarchy level. With this feature, you can now use the show interfaces mc-ae revertive-info command to view the switchover configuration information.