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Cisco Bug: CSCvs19686 - After upgrade to 16.9.4, access ports being placed into vlan 1

Last Modified

Jan 21, 2020

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases

16.9.4

Description (partial)

Symptom:
- ports configured for access mode in certain vlans are being placed into vlan 1 instead
- Affected ports lose network connectivity

Example:

interface GigabitEthernet1/0/1
 switchport access vlan 279
 switchport mode access


Switch#sh spann int g1/0/1

Vlan                Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
VLAN0001            Desg FWD 19        128.292  P2p Edge



Switch#sh mac add int g1/0/1
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    xxxx.xxxx.xxxx    STATIC      Gi1/0/1 




Switch#sh int g1/0/1 switchport
Name: Gi1/0/1
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)

Conditions:
- Upgrade to 16.9.4
- Dot1x in use.
- Affects 3850 and 9300.
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