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Cisco Bug: CSCup06835 - UDLD not working on 4k with port as dot1q trunk

Last Modified

Feb 01, 2018

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases

3.7(5)

Description (partial)

Symptom:
In the VSS setup, the ports with UDLD go to err-disable state on a 4k box which are in trunk mode.

Conditions:
The issue is not seen with ports in access mode . Also with ports in trunk mode, the issue is seen only when the command "vlan dot1q tag native" is issued on the 4k box.
The issue is observed across all the releases which support VSS.
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