Unable to configure trunk port on cisco 2960 x series

[Dharani Kumar]

When i am making a access port to trunk port in cisco 2960 x-series(24 Port Giga) unable to make the port as trunk port on the switch

When i type  switchport mode trunk

i am getting unrecognized command ..

[Karsten Iwen]

Can you provide a console-log where you try to set the interface to trunk? And a show run of the interface that you are trying to configure.

It really should work:

Switch#sh run int Gi1/0/25
Building configuration...
Current configuration : 39 bytes
!
interface GigabitEthernet1/0/25
end
Switch#
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#
Switch(config)#int Gi1/0/25
Switch(config-if)#
Switch(config-if)#do sh interf Gi1/0/25 switchport | i Administrative Mode
Administrative Mode: dynamic auto
Switch(config-if)#
Switch(config-if)#
Switch(config-if)#switchport mode trunk
Switch(config-if)#
Switch(config-if)#do sh interf Gi1/0/25 switchport | i Administrative Mode
Administrative Mode: trunk

[Dharani Kumar]

Please find the log..

blrcore00#sh run int gi1/0/22
Building configuration...

Current configuration : 141 bytes
!
interface GigabitEthernet1/0/22
 description lacp netapp1
 switchport access vlan 100
 switchport mode access
 spanning-tree portfast
end

blrcore00#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
blrcore00(config)#int gi1/0/22
blrcore00(config-if)#
blrcore00(config-if)#do sh int
blrcore00(config-if)#do sh interf Gi1/0/25 switchport | i Administrative Mode
                      ^
% Invalid input detected at '^' marker.

blrcore00(config-if)#end
blrcore00#do sh interf Gi1/0/25 switchport | i Administrative Mode
            ^
% Invalid input detected at '^' marker.

blrcore00#sh interf Gi1/0/25 switchport | i Administrative Mode
Administrative Mode: dynamic auto
blrcore00#
blrcore00#
blrcore00#
blrcore00#int gi1/0/22
          ^
% Invalid input detected at '^' marker.

blrcore00#int gi1/0/22
blrcore00#int gi1/0/22
          ^
% Invalid input detected at '^' marker.

blrcore00#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
blrcore00(config)#int gi1/0/22
blrcore00(config-if)#
blrcore00(config-if)#swi
blrcore00(config-if)#switchport mo
blrcore00(config-if)#switchport mode trunk
                                     ^
% Invalid input detected at '^' marker.

blrcore00(config-if)#

[garry.holmberg1]

Does this port belong to an etherchannel?

[Dharani Kumar]

Please find the below current port config

interface GigabitEthernet1/0/22
 description lacp netapp1
 switchport access vlan 100
 switchport mode access
 spanning-tree portfast

[Karsten Iwen]

I'm not aware of any situation that could cause this problem. Is this switch already in production? If not, I would completely erase the device and try it again to make sure that there is no dependency of configuration (although I have no idea what this could be).

Try updating the switch to a different/newer IOS-version. Never heard of a bug like this, but who knows.

If all doesn't help, open a TAC-case with Cisco.

Edit: Is it a general problem on this switch or only on particular ports?

[mikeleebrla]

In addition to what Karsten said,, before you erase the whole config, I'd try defaulting the interface itself first by issuing the command below. 

default interface GigabitEthernet1/0/22

[Tausif Gaddi]

Please refer Catalyst 2960 and 2960-S Software Configuration Guide, 12.2(55)SE, I have also posted the link.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swint.html