graceful_shutdown
parameter is sent to all the
super-spine‘s underlay neighbors (all connected spines). Each neighbor processes
the graceful_shutdown
and refreshes their routes to use the
alternate path. Maintenance mode is enabled on the first super-spine and traffic
is diverted to the second super-spine.
running-configuration
is saved on the first super-spine to
preserve all current configurations including the maintenance mode enable
configuration.
graceful_shutdown
parameter is removed from all the underlay
neighbors and traffic to the first super-spine is allowed again.
running-config
is persisted again to ensure the maintenance
mode disabled state is retained.
The same process can be carried out on the second super-spine to upgrade the firmware without traffic loss.