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Spanning tree blocked port and strange log.

hi all,

a few days ago i try to change a switch 3400 for a new 3400 enhanced and when a conect a trunk cable on this swith on a one port this port doesn´t going up. this port are configured with a trunk configuration whit all vlans what the old 3400 have.

when we make a trhoubleshoting after the first aptemp we see this strange log.

Mar 28 06:03:22: %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthernet0/24 VLAN1.
Mar 28 06:03:22: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking FastEthernet0/24 on VLAN0001. Inconsistent port type.

i dont know why the switch make this log because the port is confiugred with a trunk switchport see belong.

!
interface FastEthernet0/24

port-type nni
switchport trunk allowed vlan 1,51-53
switchport mode trunk

speed 100
duplex full

please can  you share with me any solution for this problem 

kind regards

1 Reply 1

Philip D'Ath
VIP Alumni
VIP Alumni

Sounds like a bug to me.  Upgrade the software to a gold star release or something later in the train you are using.

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