Cisco Catalyst 6500 troubleshooting – 720(Cold) why?

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Recently, we had bad a supervisor card( WS-sup720-3B) and replaced it.

Status said "Supervisor Engine 720 (Cold)" why? It should be (hot)

 

   Cisco_C6509# Show mod

:

  5    2  Supervisor Engine 720 (Cold)           WS-SUP720-3B       SAL1201XXXX
  6    2  Supervisor Engine 720 (Active)         WS-SUP720-3B       SAL1201YYYY

 

   Cisco_C6509# Show redundancy

:

Configured Redundancy Mode = sso
Operating Redundancy Mode = rpr

 

Finally, I found why and it was b/c of IOS version’s difference.

What does "Cold" mean? It means redundant stage but booting process is required.

So, two sup720 card has different version of IOS, instant failover won’t happen b/c system needs to boot with IOS whatever redundant 720 card has. 

 

 

Once both IOS is matched, status was changed to "hot" status.

 

Then, why standby card loaded different IOS. Most of case, flash card(external) is bad or un-readable in somereason. Reset or reformat the flash card and reboot the standby card. 

 

– To reboot redundancy card without power cycle

 

Cisco_C6509# hw-module module 6 reset

 

– To check storage info on both supervior cards

 

Cisco_C6509#dir sup-bootdisk:   <<— displays active

Cisco_C6509#dir slavesup-bootdisk:   <<— displays standby

 

– You can also do a verify to check if it’s copied properly

 

Cisco_C6509#verify slavesup-bootdisk:[image name]