Maintenance mode is a framework that allows for the easy removal of switch elements or the entire switch from service with minimal configuration. This feature supports the maintenance mode in WAN Routing System Adaptive Virtual Topology, including high availability deployment. Traffic is drawn away from the node entering maintenance mode. Currently, the feature supports only maintenance mode for the built-in unit System.

The objective of Maintenance Mode on MLAG is to gracefully drain away the traffic (L2 and BGP) flowing through a switch

Mlag Maintenance Mode 4.22.0F

The purpose of this feature is to mitigate multicast traffic loss when a switch that is using PIM sparse mode as its multicast routing protocol is going under maintenance.

PIM Maintenance Mode EOS 4.31.1F