BGP Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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Use case: Redistribute iBGP routes into IGP

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Overview

Provides instructions for redistributing iBGP routes into an IGP, detailing the process and requirements for integrating BGP-learned routes with internal routing protocols.

In some advanced scenarios, you may need to redistribute iBGP-learned routes into an IGP, such as OSPF or IS-IS. This process should be approached with caution due to potential routing loops.

By default, iBGP routes are not advertised into IGPs. This procedure is required if you need iBGP routes dynamically included in the IGP routing table.

Before you begin

  • Ensure you are in privileged EXEC mode.

  • Verify that BGP and your chosen IGP, OSPF or IS-IS, are already configured and operating.

  • Understand the impact and risks of redistributing iBGP routes, particularly regarding potential routing loops.

Procedure

Enter BGP router configuration mode, and enable redistribution of iBGP-learned routes into the IGP.

Example:


Router(config)# router bgp 120
Router(config-bgp)# bgp redistribute-internal