Hello Ibrahim,
The procedure is quite straight-forward => Command switch convert mode stand-alone in enable mode on the VSS system. The active chassis will be then converted to standalone. Then the same on the backup chassis (which is now in active VSS mode) to reach a two standalone systems configuration.
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http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1056162
When you convert the VSS active chassis to standalone mode, the VSS active chassis removes the provisioning and configuration information related to VSL links and the peer chassis modules, saves the configuration file, and performs a reload. The chassis comes up in standalone mode with only the provisioning and configuration data relevant to the standalone system.
Do the same with standby chassis.
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Of course, if in production environment the strategy of the migration has to be carefully defined before => saving of the configurations, new addressing, Etherchannels, STP, FHRP, routing and so on .....
Best regards.
Karim
