I am using a Cisco 6500 series with an SSO redundancy configuration. The show redundancy output is as follows:

             Hardware Mode = Duplex
Configured Redundancy Mode = sso
 Operating Redundancy Mode = rpr
          Maintenance Mode = Disabled
            Communications = Up

I would assume the device is operating in RPR mode although SSO is configured. What could cause this? Shouldn't the operating mode be SSO?

EDIT (show redundancy states):

   my state = 13 -ACTIVE
 peer state = 4  -STANDBY COLD
       Mode = Duplex
       Unit = Primary
    Unit ID = 5
    Redundancy Mode (Operational) = rpr
    Redundancy Mode (Configured)  = sso
    Redundancy State              = rpr

 Split Mode = Disabled
 Manual Swact = Enabled
 Communications = Up

  client count = 60
  client_notification_TMR = 30000 milliseconds
      keep_alive TMR = 9000 milliseconds
    keep_alive count = 1
keep_alive threshold = 18
       RF debug mask = 0x0