From http://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-6300-series-fabric-interconnects/whitepaper-c11-736918.html
Transitioning from Cisco UCS 6100 Series Fabric Interconnect to Cisco UCS 6332 Platform
In-service upgrade from the Cisco UCS 6100 Series to Cisco UCS 6332 platform fabric interconnects is not supported. The upgrade path requires the existing Cisco UCS instance to use Cisco UCS Software Release 3.1(1), which does not support first-generation hardware. Thus, the better approach is to set up a new pod with the current hardware and migrate the workload to that.
You can export and import the configuration from the Cisco UCS 6100 Series to the 6300 Series, maintain the pools, policies, and service profiles. Any irrelevant or dated policies and configurations will be ignored by Cisco UCS Manager with Release 3.1(1).
If you want to perform in-service migration, this will require a multiple-upgrade path: from the Cisco UCS 6100 and 2100 Series to the Cisco UCS 6200 and 2200 Series, and then to the Cisco UCS 6332 platform and 2200 Series or the Cisco UCS 6332 and 2300 Series, with the assumption that the server hardware has been verified to support this migration.
