Symptom

If an ASR9k acting as a BNG attempts to terminate PPP subscriber sessions when receiving a Framed-Route attribute sent from RADIUS without a next-hop and metric string, the PPP session will fail to establish.

Conditions

ASR 9000 acting as a BNG running IOS-XR 5.1.0, and when PPP subscriber profiles in RADIUS are configured with a Framed-Route attribute which does not explicitly specify a next-hop and metric/distance value. For example: Framed-Route = "10.1.1.0 255.255.255.252" This is not observed in XR 4.3.

Workaround

Use XR 4.3.x, or explicitly configure the Framed-Route attribute to include the next-hop and metric string for each user profile: Framed-Route = "10.1.1.0 255.255.255.252 0.0.0.0 1"

Further Problem Description