Hi All, I would like to update when you have quad sup running in the VSS chasis then the In-Chasis standby will be in RPR mode which is expected result hence dont get confuse and troubleshoot when you dont see the module in Hot Standby state. Please find details below:- Quad-Supervisor (In-chassis Standby Supervisor Engine) Support Beginning with IOS XE release 3.8.0E, Cisco Catalyst 4500-E switches configured with Supervisor Engines 7-E, 7-LE, or 8E support Quad-Supervisor VSS Mode. With Quad-Supervisor VSS mode, each chassis in the VSS supports a redundant supervisor engine, called the in-chassis standby (ICS). The ICS supervisor engines use Route Processor Redundancy (RPR) mode, and remain in RPR Standby Cold redundancy state. If the Active supervisor fails, the ICS supervisor boots fully, and becomes the Active supervisor within the chassis, while the local chassis remains nonoperational till SSO redundancy is established with the VSS Active supervisor.   Example of the output after the VSS builds up would show as mentioned below:-   switch-1#show module   Switch Number: 1 Role: Virtual Switch Active   5     8  Sup 8-E 10GE (SFP+), 1000BaseX (SFP)   WS-X45-SUP8-E      CATxxxxxx 6     8  Sup 8-E 10GE (SFP+), 1000BaseX (SFP)   WS-X45-SUP8-E      CATxxxxxx   Switch Number: 1 Role: Virtual Switch Active   Mod  Redundancy role     Operating mode      Redundancy status   ----+-------------------+-------------------+----------------------------------  5   Active Supervisor   SSO                 Active  6   In-Chassis Standby  RPR                 Standby cold  >>>>>>>>>RPR   Switch Number: 2 Role: Virtual Switch Standby   Mod Ports Card Type                              Model              Serial No.   ---+-----+--------------------------------------+------------------+-----------  5     8  Sup 8-E 10GE (SFP+), 1000BaseX (SFP)  WS-X45-SUP8-E      CATxxxxxx  6     8  Sup 8-E 10GE (SFP+), 1000BaseX (SFP)  WS-X45-SUP8-E      CATxxxxxx   Mod  Redundancy role     Operating mode      Redundancy status   ----+-------------------+-------------------+----------------------------------  5   Standby Supervisor  SSO                 Standby hot  6   In-Chassis Standby  RPR                 Standby cold >> RPR   Ref:- http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE3-8-0E/... Also Please find the document below which would explain the procedure how to build the quad sup VSS from scratch. http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4500-series-...   Hope this helps. Regards Inayath **Please rate the post if helpfull** ... View more