Upgrading Software; Fast Software Upgrade - Cisco WS-C6506 Software Manual

Upgrading Software

Upgrading Software
These sections describe how to upgrade the MSFC software:
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Before performing any software upgrade procedure, see the
Note
section on page

Fast Software Upgrade

Note Because the system is in RPR mode during the fast software upgrade, service is interrupted. The
switchover is not stateful; interfaces go down but come back up as the MSFC initializes and comes up in RPR
mode. Additionally, any configuration changes that are not saved are lost.
This procedure requires that the Cisco IOS Release on both MSFCs supports RPR (at a minimum), and
Note
both MSFCs must be running the same software version. The active MSFC checks the standby image
version when the standby MSFC is coming up, and if the standby image version does not match the active
image version, the redundancy mode falls back to RPR.
This procedure does not work with SRM and DRM images.
Note
The redundant supervisor engines must be the same type with the same model PFC and MSFC.
Note
The fast software upgrade allows you to reduce planned downtime for software upgrades or downgrades.
The fast software upgrade procedure consists of loading a new image onto both the standby MSFC and
the active MSFC, and then rebooting the standby MSFC. The new image running on the standby MSFC
is incompatible with the image currently running on the active MSFC, so the standby MSFC comes up
in RPR mode. The fast software upgrade is done in RPR mode to avoid image incompatibility during the
upgrade process.
To bring the new images into service, the standby MSFC is forced to switch over by taking the active
MSFC out of service; the standby MSFC now becomes the active MSFC. Next, the out-of-service MSFC
is allowed to boot; it becomes the standby MSFC but runs the newly upgraded image. The new image is
running on both MSFCs, and the standby MSFC comes up in the hot-standby state. At this point, the
system is now running in SSO mode because both MSFCs are running the same image version.
You may restore the original roles of the MSFCs (their active and passive status) by forcing another
Note
switchover in which the standby MSFC becomes the active MSFC.
To perform fast software upgrade procedure, perform these steps:
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
24-14
Fast Software Upgrade, page 24-14
Upgrading to SSO from Single Router or Dual Router Modes, page 24-15
Mixed-Mode Operation, page 24-15
24-4.
Chapter 24 Configuring NSF with SSO MSFC Redundancy
"Configuration Guidelines and Restrictions"
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