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Cisco Bug: CSCvs52966 - VLAN assignment fails with %PM-3-INTERNALERROR and traceback in pm_vlan_add_port

Last Modified

Aug 26, 2020

Products (1)

  • Cisco Catalyst 9400 Series Switches

Known Affected Releases


Description (partial)

A switchport does not learn any MAC address and does not pass traffic.

The syslogs show an error similar to the following:
%PM-3-INTERNALERROR: Port Manager Internal Software Error (!pm_vlan_test_portlist(vlan, pd->globalNumber): ../switch/pm/pm_vlan.c: 1935: pm_vlan_add_port)
-Traceback= 1#c93b8baef7d3bc61cf9973400fbecb68  :55D44699D000+42C267D :55D44699D000+42AAAC8 :55D44699D000+9C43C20 :55D44699D000+9C43B98 :55D44699D000+9C43C20 :55D44699D000+9C43B98 :55D44699D000+42A50E6 :55D44699D000+9C43C20 :55D44699D000+42A364A :55D44699D000+9C43C20 :55D44699D000+42940D4 :55D44699D000+4BEED5C :55D44699D000+5D2DAF3 :55D44699D000+5D2D60E :55D44699D000+9C43B66 :55D44699D000+5D20B0D

The running-config shows the correct vlan assigned to the port, however "show interface ... switchport" refers to vlan 1 instead.

This may occur when a vlan is changed in a service-template, or after removing dot1x configuration from a switchport and assigning a static vlan.
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