Prerequisites for Nonstop Forwarding
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The networking device that is to be configured for NSF must first be configured for SSO. For information, see the Configuring Stateful Switchover section.
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For Border Gateway Protocol (BGP) NSF, all neighboring devices must be NSF-aware and must be configured for BGP graceful restart.
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For Enhanced Interior Gateway Routing Protocol (EIGRP) NSF: - All neighboring devices must be NSF-capable or NSF-aware.
- An NSF-aware device must be completely converged with the network before it can assist an NSF-capable device in an NSF restart operation.
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For Internet Engineering Task Force (IETF) Intermediate System to Intermediate System (IS-IS), all neighboring devices must be NSF-aware.
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For Open Shortest Path First (OSPF) NSF, all networking devices on the same network segment must be NSF-aware.
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For IPv6 NSF, IPv6 must be enabled on your networking device.
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On platforms supporting the Route Switch Processor (RSP), and where the Cisco Express Forwarding (CEF) switching mode is configurable, configure distributed CEF (dCEF) switching mode using the ip cef distributed command.