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Cisco Bug: CSCvt75420 - NBAR is providing incorrect classification for Proxy device

Last Modified

Oct 11, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

16.12.3

Description (partial)

Symptom:
The customer’s topology is:  Clients --- Proxy A --- Proxy B --- Servers
Since we have an NBAR router between proxies A and B , Proxy A is in fact the client for all client connections going to Proxy B or any other destination.
Clients with softphones communicate with UC servers, so cisco-phone flows are initiated from Proxy A. With the behavioral mechanism, after certain amount of flows seen by the router, it will register an entry for Proxy A as ?PL Client? with ?cisco-phone? application. And from this point on all connections initiated through it will be cisco-phone.

Conditions:
NBAR and proxy server
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