Upgrading To Sso From Single Router Or Dual Router Modes; Mixed-Mode Operation - Cisco WS-C6506 Software Manual

Chapter 24 Configuring NSF with SSO MSFC Redundancy
Copy the new image to both MSFCs.
Step 1
Set the boot variables and save the configuration by entering the write memory command.
Step 2
Reset the standby MSFC and bring it back online, running the new image. Ensure the standby MSFC is
Step 3
fully online by entering the show redundancy states command.
Do a manual switchover by entering the redundancy force-switchover command. The standby MSFC
Step 4
becomes the newly active MSFC running the new image. Because the system was in RPR mode before
the switchover, the installed modules are reset and redownloaded with the new software during the
switchover.
After the new standby MSFC reboots and comes back online, both MSFCs and installed modules are
Step 5
running the new version of the software.

Upgrading to SSO from Single Router or Dual Router Modes

This upgrade interrupts service. The actual downtime varies based on the configuration of the switch,
Note
but it will not be longer than the time it takes to boot the system and come online.
When upgrading to SSO from SRM or DRM, you must save your configuration before performing the
Note
upgrade. DRM configurations generate parse errors when the system reloads the new image. After the
upgrade, DRM configurations need to be reconfigured for use with SSO.
Cisco IOS software prior to Cisco IOS Release 12.2(18)SXF is either SRM and/or DRM capable but
does not support upgrading to SSO. These software images cannot be upgraded using the fast software
upgrade procedure. To upgrade this software, you are required to load the new images on each of the
MSFCs, and then simultaneously boot both MSFCs.
After the new images have been loaded on the MSFCs, you must reboot the system to load the new
images. During this boot time, the switch is offline and you will not see the benefits of SSO until the
new images are loaded.

Mixed-Mode Operation

If you make a mistake when upgrading the software, it may result in a mixed-mode situation in which
an SSO-based image is running on one MSFC and an SRM and/or DRM based image is running on the
other MSFC. This situation could lead to system stability problems.
In this mixed mode, if the SSO-based image is running on the active MSFC, the active MSFC will boot
completely, coming up in a simplex (nonredundant) state. The SRM and/or DRM based image will also
boot but will remain in a standby state.
OL-8978-04
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Upgrading Software
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