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Cisco Bug: CSCun04952 - Shutdown tunnel causes AppNav-XE traffic loss

Last Modified

Apr 17, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.3(3)S1 15.3(3)S2 15.4(1)S

Description (partial)

customer seen defect

Traffic which needs to be send between appnav-controllers will get lost. 

Received inter-appnav-controller packets will get assigned to the shutdown tunnel interface.

As a result, no flows will be synchronized between this appnav-controller and appnav-controllers in the same appnav-controller-group. Asymmetrically routed packet will also fail due to lack of flow and unable to query flow from other appnav-controller.

Having a shutdown tunnel interface configured with tunnel source equals to the local appnav-controller IP and tunnel destination equals to the IP of another appnav-controller in the appnav-controller-group (i.e. another ASR router).

To detect this problem the following counter will go up for every dropped packet:

show platform hardware qfp active statistics drop | i Disabled

alternatively you can use a packet-trace feature on 3.10.2 and above to check for the dropped reply getting send to the shutdown tunnel interface.
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