Super-Spine Firmware Upgrade in Clos
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The firmware on the first super-spine is downloaded.
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Enabling maintenance mode on a super-spine involves the Border Gateway Protocol (BGP). The
graceful_shutdown
parameter is sent to all the super-spine‘s underlay neighbors (all connected spines). Each neighbor processes thegraceful_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. -
The
running-configuration
is saved on the first super-spine to preserve all current configurations including the maintenance mode enable configuration. -
The device is rebooted for firmware activation without traffic loss.
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Once the new firmware is activated, maintenance mode can be disabled. The
graceful_shutdown
parameter is removed from all the underlay neighbors and traffic to the first super-spine is allowed again. -
The
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.
First super-spine firmware upgrade with maintenance modeSecond super-spine firmware upgrade with maintenance mode