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Cisco Bug: CSCvv27096 - Catalyst 9300 dropping traffic as AUTH_DRIVEN_DROP on authenticated port

Last Modified

Sep 25, 2020

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases


Description (partial)

Traffic loss seen to hosts on successfully authenticated MAB ports after upgrade to 16.9.5
This could appear as cameras or access points becoming unreachable until the port is bounced or authentication session is cleared.

Packet drop counters will increase in the ASIC under the "AUTH_DRIVEN_DROP" drop reason

Switch#show plat hard fed sw 2 fwd-asic drop except | ex 0          0           0

****EXCEPTION STATS ASIC INSTANCE 0 (asic/core 0/0)****
 Asic/core |                NAME                  |   prev   |  current  |  delta   
0  0  AUTH_DRIVEN_DROP                               2225419    2235480     10061   
0  0  PKT_DROP_COUNT                                 2226729    2236790     10061

A switchport with a successful MAB authentication session.

IOS-XE version 16.9.5
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