Cisco SUP Failover (6500)

Here is how to check your 6500 dual SUP 720 modules.  But first, lets see what the Cisco documentation says:

CISCO DOCUMENTATION:
There are three modes in redundancy for the standby supervisor when native Cisco IOS Software is used:

RPR The show module command displays Cold
RPR+ The show module command displays Warm
SSO The show module command displays Hot
For any other states, the standby supervisor displays Other in the show module command output.

RPR needs two minutes or more to switch over from active to standby, while RPR+ needs 30 seconds or more. On the other hand, SSO needs 0-3 seconds for the switchover on Layer 2. SSO works with Cisco NSF, which helps reduce the switchover downtime on Layer 3.

(https://supportforums.cisco.com/document/20871/supervisor-engines-configured-redundancy-appear-standby-hot-and-standby-cold-output)

What the core 6509-E says:
Core1#sh redundancy states
       my state = 13 -ACTIVE
     peer state = 8  -STANDBY HOT
           Mode = Duplex
           Unit = Primary
        Unit ID = 5

Redundancy Mode (Operational) = Stateful Switchover
Redundancy Mode (Configured)  = Stateful Switchover
     Split Mode = Disabled
   Manual Swact = Enabled
 Communications = Up


Core1#sh mod
Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  1   48  CEF720 48 port 1000mb SFP              WS-X6748-SFP       xxx
  4    0  SLB Application Processor Complex      WS-X6066-SLB-APC   xxx
  5    2  Supervisor Engine 720 (Active)         WS-SUP720-3B       xxx
  6    2  Supervisor Engine 720 (Hot)            WS-SUP720-3B       xxx
  7   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     xxx
  8   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     xxx
  9   48  SFM-capable 48 port 10/100/1000mb RJ45 WS-X6548-GE-TX     xxx

According to the documentation above, looks like we are doing SSO and should take only a few seconds to failover.