In Catalyst 4500 and 6500 series switches, Cisco Non-Stop Forwarding (NSF) works with in conjunction with SSO to minimize the amount of time a network is unavailable to its users following a switchover while continuing to forward IP packets. NSF is primarily used to ensure the continued forwarding IP packets following a Supervisor Engine switchover.
NSF is supported by BGP, OSPF, EIGRP, IS-IS, as well as CEF. NSF allows the routing protocols to detect a switchover and take the necessary action to continue forwarding network traffic. NSF allows routing protocols to recover route information from the NSF-capable . . .
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