Configure BGP Using Loopback Address Examples

By | 9th November 2015

Configure BGP Using Loopback Address

Configuring BGP using loopback addresses is a very good practise, especially with iBGP. Loopback interface is virtual; only implemented in software without any association to the hardware.

Loopback interface is always up and will be reachable through an IP address configured on it.

To configure iBGP using a loopback address, use the following command:

neighbor ip-address update-source interface

bgp loopback config

RouterHQ Configuration Command:

bgp loopback config2

BranchOffice Configuration Command :

bgp loopback config3

Looking at the above configuration base on the sample topology, , RouterHQ and BranchOffice belongs to the same AS 556 (iBGP).

RouterHQ is configured to use the loopback IP address as the source in the TCP neighbor connection.  For BranchOffice to speak to RouterHQ, it uses the loopback interface of RouterHQ.

How to Configure iBGP

How to Configure eBGP

How to Configure eBGP Multihop

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