However, when the neighbor update-source command is used, any operational interface, which includes the loopback interface, can be specified to establish TCP connections. A BGP session between two BGP peers is said to be an internal BGP (iBGP) session if the BGP peers are in the same autonomous systems.īy default, the peer relationship is established with the IP address of the interface closest to the peer router. The BGP session between two BGP peers is said to be an external BGP (eBGP) session if the BGP peers are in different autonomous systems (AS).
A BGP router needs to establish a connection (on TCP port 179) to each of the BGP peers before BGP updates can be exchanged. Background InformationīGP is an exterior gateway protocol (EGP), used to perform interdomain routing in TCP/IP networks. Conventionsįor more information on document conventions, refer to Cisco Technical Tips Conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. Prerequisites RequirementsĬisco recommends that you have knowledge of these topics:
#GNS3 TUTORIAL FRANCAIS HOW TO#
This document describes how to configure iBGP and eBGP with or without a loopback address.
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