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Cisco Bug: CSCvu70488 - TCP session is not established between catalyst 3850 and ISE servers

Last Modified

Sep 25, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

16.12

Description (partial)

Symptom:
When 3850 is configured to have ISE reachability through loopback interface over vrf, we face switch connectivity issue where TCP Session is not established

The switch initiates the tcp connection with ISE, ISE responds with ACK, then the switch resets the connection.

Conditions:
Reachability through loopback interface over vrf
Two different vrf is configured and leak is observed in 3850 between both vrf
Switch ignores the TCP SYN, ACK packets
Issue seen in 16.6.x code - 16.6.4 and 16.6.7
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