Specifications

CHAPTER
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5-1
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
5
Configuring Basic BGP
This chapter describes how to configure Border Gateway Protocol (BGP) on a Cisco NX-OS switch.
This chapter includes the following sections:
• Information About Basic BGP, page 5-1
• Licensing Requirements for Basic BGP, page 5-7
• Prerequisites for BGP, page 5-7
• Guidelines and Limitations for BGP, page 5-8
• CLI Configuration Modes, page 5-8
• Default Settings, page 5-10
• Configuring Basic BGP, page 5-10
• Verifying the Basic BGP Configuration, page 5-21
• Displaying BGP Statistics, page 5-23
• Configuration Examples for Basic BGP, page 5-23
• Related Topics, page 5-23
• Where to Go Next, page 5-23
• Additional References, page 5-23
• Feature History for BGP, page 5-24
Information About Basic BGP
Cisco NX-OS supports BGP version 4, which includes multiprotocol extensions that allow BGP to carry
routing information for IP multicast routes and multiple Layer 3 protocol address families. BGP uses
TCP as a reliable transport protocol to create TCP sessions with other BGP-enabled switches.
BGP uses a path-vector routing algorithm to exchange routing information between BGP-enabled
networking switches or BGP speakers. Based on this information, each BGP speaker determines a path
to reach a particular destination while detecting and avoiding paths with routing loops. The routing
information includes the actual route prefix for a destination, the path of autonomous systems to the
destination, and additional path attributes.