1.0 Architecture

High Availability Switching Practice Questions

SSO, NSF, StackWise, and gateway redundancy on modular Cisco switches.

One solved question, so you can see how these are marked

When combining Stateful Switchover (SSO) with Nonstop Forwarding (NSF) on a dual-supervisor Cisco Modular Switch, what is the role of NSF during an active supervisor failure?

NSF allows the data plane hardware to continue forwarding packets using existing FIB tables while the standby supervisor restarts routing protocol neighbor relationships.

While SSO maintains control plane state synchronization between active and standby supervisors, NSF enables data plane line cards to continue forwarding IP traffic without interruption while the newly active supervisor re-establishes routing peerings.

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