01-25-2009 04:33 PM - edited 03-06-2019 03:38 AM
Hi every body!
I was reading about redundancy in switch supervisors.
There are different modes:
1) route processor redundancy(RPR)
2)Route processor redundancy(RPR+)
3)stateful switchover (SSO)
q1)I understand how these modes but my question is why one want to use any other mode but sso as fail over time is less than a second compared to other modes ?
q2) Should both supervisors be same?
Thanks a lot!
01-26-2009 12:44 AM
Hello Sarah,
q1) SSO requires identical supervisors, identical ios image and newer IOS image (it has more tight requirements) so there can be cases where RPR or RPR+ can be used but SSO cannot
q2) for SSO they need to be exactly the same model, RPR and RPR+ have lesser requirements
see
Hope to help
Giuseppe
01-26-2009 09:11 PM
thanks a lot Giuseppe!
My book says
For RPR+ ios must be of same release. How about sup? they should be same as well?
01-26-2009 09:22 PM
The sups' have to be the same as well.
regards,
-amit singh
01-26-2009 01:19 AM
Hi ,
There are several modes , but every mode has its own unique circumstances. The fastest mode is not always the best mode
1)SSO enables subsecond convergence , but some state tables like HSRP encounters problems during the switchover. For example if your supervisors or RPs switch faster than your HSRP timeout , you will definetely experience a switchover in the HSRP state as well.
2) The Supervisors / RPs must be the same.
HTH
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