6509 Sup swap failover time

Question

Hi,
I'm having MLS 6509 with Sup2/MSFC2 and running either 12.1(23)E1 and 12.1(26)E1.
IF i do sup swap using "reducancy force switchover" all line card interface goes down and even ospf also goes down and then come back and that create outage for me.
Can any body tell me is it expected behaviour ? and if yes, what is taken over time inlclduing making interface and all routing process up.
Rgds
Chintan

Answer 1

Hi Chintan
I think the best way to avoid this is configuring NSF with SSO Supervisor Engine Redundancy:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_guide_chapter09186a008027e4cd.html
Cisco NSF works with SSO to minimize the amount of time a network is unavailable to its users following a switchover while continuing to forward IP packets. The main purpose of NSF is to continue forwarding IP packets following a supervisor engine switchover.
Cisco NSF is supported by the BGP, OSPF, and IS-IS protocols for routing and is supported by Cisco Express Forwarding (CEF) for forwarding. The routing protocols have been enhanced with NSF-capability and awareness, which means that routers running these protocols can detect a switchover and take the necessary actions to continue forwarding network traffic and to recover route information from the peer devices.
But you will need a 12.2 IOS release to run this feature.
Hope this helps