Port-channel Trunk not showing allowed vlans? C9407

[lowfell]

I have a port-channel setup as a trunk with allowed vlans, however when i do a show interface trunk it shows no allowed vlans can someone tell me why ?

!
interface Port-channel128
description 
switchport trunk allowed vlan 2,201,208,253-255,705
switchport mode trunk

!
!
interface GigabitEthernet7/0/1
description 
switchport trunk allowed vlan 2,201,208,253-255,705
switchport mode trunk
channel-group 128 mode active
!
interface GigabitEthernet7/0/2
description 
switchport trunk allowed vlan 2,201,208,253-255,705
switchport mode trunk
channel-group 128 mode active
!

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

output of show int trunk showing no allowed vlans?????

#sho int port-channel 128 trunk

Port Mode Encapsulation Status Native vlan
Po128 on 802.1q other 0

Port Vlans allowed on trunk
Po128 none

Port Vlans allowed and active in management domain
Po128 none

Port Vlans in spanning tree forwarding state and not pruned
Po128 none
!
!

#sho int GigabitEthernet7/0/1 trunk

Port Mode Encapsulation Status Native vlan
Gi7/0/1 on 802.1q other 1

Port Vlans allowed on trunk
Gi7/0/1 none

Port Vlans allowed and active in management domain
Gi7/0/1 none

Port Vlans in spanning tree forwarding state and not pruned
Gi7/0/1 none

[M Talha]

Dear lowfell,

Add these to your configuration

interface Port-channel128
description

switchport trunk encapsulation dot1q    <--- Add tagging if you want your VLANS to be tagged !!
switchport trunk allowed vlan 2,201,208,253-255,705
switchport mode trunk

interface GigabitEthernet7/0/1
description 

switchport trunk encapsulation dot1q    <--- Add tagging if you want your VLANS to be tagged !!
switchport trunk allowed vlan 2,201,208,253-255,705
switchport mode trunk

channel-protocol lacp   <--- Define channel protocol i.e LACP or PAgP
channel-group 128 mode active
!
interface GigabitEthernet7/0/2
description 

switchport trunk encapsulation dot1q     <--- Add tagging if you want your VLANS to be tagged !!
switchport trunk allowed vlan 2,201,208,253-255,705
switchport mode trunk

channel-protocol lacp    <--- Define channel protocol i.e LACP or PAgP
channel-group 128 mode active

HTH

Regards,

Talha

[Deepak Kumar · Accepted solution]

Hi,

#sho int port-channel 128 trunk
Port Mode Encapsulation Status Native vlan
Po128 on 802.1q            other      0

Check the port status Other and Native VLAN 0. The classified reason will be configuration mismatch at another end. Please check remote end device 

[lowfell]

We did have the other end connected, but now those switches are gone and i'm tidying up the config on the 9407, so, to cut a long story short, if the portchannel had been up, i could have seen my allowed vlans, yes?

[lowfell]

Thanks for your help Deepak. i wrongly assumed because i had the allowed vlans in the config then i should be able to see them when I did show int trunk. Obviously I need thetrunk to be up first! 'll remember now.
thanks again.