Cisco WS-C6506 Software Manual page 762

Chapter 24 Configuring NSF with SSO MSFC Redundancy
Upgrading Software
Another example of a mixed-mode upgrade scenario is when the SRM and/or DRM image is running on
the active MSFC and the SSO-based image is running on the standby MSFC. In this mode, the active
MSFC running the SRM and/or DRM image will boot completely, but the SSO-based image running on
the standby MSFC will incorrectly determine that it is the active MSFC and will try to boot as the active
MSFC. When the inventory message is received from the supervisor engine indicating it should be the
standby MSFC, it will report an MSFC role mismatch error and reload itself. This problem can happen
whenever an SRM, DRM, or boothelper image is running on the active MSFC and you try to load an SSO
capable image on the standby MSFC.
To correct both scenarios, you must either upgrade the SRM and/or DRM software to the same level as
the SSO-based software, or downgrade the SSO-based software to the level of the SRM and/or DRM
image.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
24-16
OL-8978-04