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Cisco Bug: CSCum14830 - IPv6/After route leak from vrf to global using BGP, next hop shows null0

Last Modified

Apr 18, 2019

Products (4)

  • Cisco IOS
  • Cisco Catalyst 6500 Series Virtual Switching Supervisor Engine 720 with 10GE uplinks
  • Cisco Catalyst 6500 Series Supervisor Engine 2T
  • Cisco Catalyst 6500 Series Supervisor Engine 720 / MSFC3

Known Affected Releases

15.1(2)SY

Description (partial)

Symptom: Leaking IPv6 routes is observed from a VRF table into the global table using BGP.
These routes consist of the following:
1. BGP routes learned from the VRF IPv6 BGP peer.
2. Redistributed static and connected routes.
 
The BGP routes leak fine, but the redistributed static and connected routes have an issue. After the redistributed routes leak, the exit interface shows "null0". Sometimes instead of showing the exit interface as "null0", it shows a  random interface which is a part of VRF and has IPv6 enabled on it.

Conditions: This symptom occurs with IPv6 redistributed connected and static routes into BGP VRF (could also be redistributed from other protocols as well but have not  been tested).
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Bug Details Include

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