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Cisco Bug: CSCup47120 - ASR9k BNG-subscriber route not withdrawn from RIB upon initiator change

Last Modified

Jul 20, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.2.BASE

Description (partial)

Symptom:
In a IPoE dual-initiator environment (initiator dhcp + unclassified source on same access interface), if a subscriber with an established packet-trigger session suddenly changes to a DHCP client, the original /32 subscriber route from the packet-trigger session is never withdrawn, leaving a stale route in the RIB pointing to Unknown:

Routing entry for 10.1.1.5/32
  Known via "subscriber", distance 2, metric 0 (connected)
  Installed Jun 13 17:33:39.561 for 00:01:39
  Routing Descriptor Blocks
    directly connected, via Unknown
      Route metric is 0
  No advertising protos.

Conditions:
This occurs on ASR 9000 BNG deployments with both DHCP and unclassified source initiators on subscriber access interfaces, through XR 4.3.4 and 5.1.2.
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