Cisco 6500 - Manual (Page 54)

4-54
Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Upgrading a VSS
Upgrading a VSS
Cisco IOS Rel ease 12.2(33)SXH supports a fast software upgrade (FSU) of the VSS using RPR.
Cisco IOS Release 12.2(33)SXI and later releases support an enhanced fast software upgrade (eFSU) of
the VSS using SSO.
This section describes both types of VSS upgrade:
• Performing a Fast Software Upgrade of a VSS, page 4-54
• Performing an Enhanced Fast Software Upgrade of a VSS, page 4-55
Performing a Fast Software Upgrade of a VSS
The FSU of a VSS is similar to the RPR-based standalone chassis FSU described in the “Performing a
Fast Software Upgrade” section on page 7-6 . While the standalone chassis upgrade is initiated by
reloading the VSS standby supervisor engine, the VSS upgrade is initiated by reloading the VSS standby
chassis. During the FSU procedure, a software version mismatch between the VSS active and the VSS
standby chassis causes the system to boot in RPR redundancy mode, which is stateless and causes a hard
reset of the all modules. As a result, the FSU procedure requires system downtime corresponding to the
RPR switchover time.
Note VSS mode supports only one supervisor engine in each chassis. If another supervisor engine resides in
the chassis it will act as the DFC.
To perform an FSU of a VSS, perform this task:
Command Purpose
Step 1 Router# copy tftp disk_name Uses TFTP to copy the new software image to flash
memory on the VSS active and VSS standby chassis
(disk0: and slavedisk0:). Answer the prompts to identify
the name and location of the new software image.
Step 2 Router# config terminal Enters global configuration mode.
Step 3 Router(config)# no boot system Removes any previously assigned boot variables.
Step 4 Router(config)# config-register 0x2102 Sets the configuration register.
Step 5 Router(config)# boot system flash device:file_name Configures the chassis to boot the new image.
Step 6 Router(config)# end Returns to privileged EXEC mode.
Step 7 Router# copy running-config startup-config Saves the configuration.