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Catalyst 2950 problem

cisco Switch 2950 showing problem while connecting with other device(Packetwave bridge 100) or switch(Dlink)

Output of uplink port is:

%SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthernet0/22 VLAN1.

00:20:54: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking FastEthernet0/22 on VLAN0001. Inconsistent port type

3 REPLIES
New Member

Re: Catalyst 2950 problem

Do u have VLAN's in your network?

If yes and if you want to configure this as an uplink for all VLAN's then do thi

interface fast ethernet0/22

switchport trunk encapsulation dot1q

swithcport mode trunk

Cisco Employee

Re: Catalyst 2950 problem

The message means that a Spanning tree BPDU was received with a dot1q tag on a port that is not configured as a trunk.

This means that either the port is not configured as a trunk and should be, or that the connecting device is configured as a trunk and should not be.

The second syslog message indicates that the port is being blocked due to the inconsistency as described above.

New Member

Re: Catalyst 2950 problem

Verify that the configuration and operational state of the listed interface and that of the interface to which it is connected have the same mode (access or trunk). If the mode is trunk, verify the same encapsulation (none, ISL or 802.1Q). Once these parameters are consistent, spanning tree will automatically unblock the interfaces as appropriate.

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