Rolling Back to Previous Versions of Netvisor

After upgrading to a newer version of Netvisor, you can rollback to an earlier version and preserve the current configuration. The new configuration is applied before booting into the previous environment so that critical ACLs and security vFlows are present when Netvisor restarts.

A new parameter, apply-current-config, for the command, bootenv-active-and-reboot, provides support for this feature.

Before rebooting, Netvisor copies the current boot environment transaction logs into the target boot environment.

After rebooting, Netvisor performs the following:


 

Caution! Retaining the current configuration when booting to an older version of Netvisor is best-effort. Some transaction IDs from the newer (or current) version may not properly apply due to feature incompatibility. It is not guaranteed that all changes are applied.


 

Caution! You must apply the parameter, apply-current-config, on all nodes in the fabric. There is no coordination across the fabric for this process, therefore the commitment of fabric transactions on one node but not another using this process causes the fabric to go out of sync and may result in unrecoverable errors.