Symptom

BGP may retain routes from a BGP neighbor, when the BGP routes should not be retained

Conditions

This may occur on an IOS XR router in the following condition: RTRa-----------BGP peering------------RTRb 1. RTRb shuts down multiple BGP neighbors that are peering to RTRa 2. RTRa should receive a Cease notification that RTRb is administratively shutting down the BGP session and not retain any of RTRb's BGP routes

Workaround

The workaround is to make the following non-impactfuls configuration change in the RTRa BGP configuration: config t router bgp xxxxx bgp graceful-restart retain-nbr-routes disable commit end

Further Problem Description