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Cisco IOS XR Routing Configuration Guide
OL-14356-01
Implementing BGP on Cisco IOS XR Software
Border Gateway Protocol (BGP) is an Exterior Gateway Protocol (EGP) that allows you to create
loop-free interdomain routing between autonomous systems. An autonomous system is a set of routers
under a single technical administration. Routers in an autonomous system can use multiple Interior
Gateway Protocols (IGP) to exchange routing information inside the autonomous system and an EGP to
route packets outside the autonomous system.
This module provides the conceptual and configuration information for BGP on Cisco IOS XR software.
Note For more information about BGP on the Cisco IOS XR software and complete descriptions of the BGP
commands listed in this module, you can see the “Related Documents” section of this module. To locate
documentation for other commands that might appear while performing a configuration task, search
online in the Cisco IOS XR software master command index.
Feature History for Implementing BGP on Cisco IOS XR Software
Release Modification
Release 2.0 This feature was introduced on the Cisco CRS-1.
Release 3.0 No modification.
Release 3.2 Support was added for the Cisco XR 12000 Series Router.
Release 3.3.0 VPN routing and forwarding (VRF) support was added, including
information on VRF command modes and command syntax.
BGP cost community information was added.
Release 3.4.0 The following features were supported:
• Four-byte autonomous system (AS) number
• Carrier supporting carrier (CSC) for BGP was added. See
Cisco IOS XR Multiprotocol Label Switching Protocol Configuration
Guide for information
• Key chains