Cisco N7K-C7010 Configuration Guide - Page 129
Configuring Bidirectional Forwarding Detection, Information About BFD
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Send document comments to [email protected] 5 C H A P T E R Configuring Bidirectional Forwarding Detection This chapter describes how to configure Bidirectional Forwarding Detection (BFD) on Cisco NX-OS devices. This chapter includes the following sections: • Information About BFD, page 5-1 • Licensing Requirements for BFD, page 5-4 • Prerequisites for BFD, page 5-4 • Guidelines and Limitations, page 5-5 • Default Settings, page 5-6 • Configuring BFD, page 5-6 • Verifying the BFD Configuration, page 5-25 • Monitoring BFD, page 5-25 • Configuration Examples for BFD, page 5-26 • Additional References, page 5-26 • Feature History for BFD, page 5-27 Information About BFD BFD is a detection protocol designed to provide fast forwarding-path failure detection times for media types, encapsulations, topologies, and routing protocols. You can use BFD to detect forwarding path failures at a uniform rate, rather than the variable rates for different protocol hello mechanisms. BFD makes network profiling and planning easier and reconvergence time consistent and predictable. BFD provides subsecond failure detection between two adjacent devices and can be less CPU-intensive than protocol hello messages because some of the BFD load can be distributed onto the data plane on supported modules. This section includes the following topics: • Asynchronous Mode, page 5-2 • BFD Detection of Failures, page 5-2 • Distributed Operation, page 5-3 • BFD Echo Function, page 5-3 • Security, page 5-4 OL-23435-03 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x 5-1