'show interface trunk' output is blank

Enki Doe · ‎03-08-2020

when i get a blank output of the show int trunk, this means that the link is down.

But how should i fix that besides reentering all the code again? Is there an easy way?

Also, how can i see, when using vlans, which port has which vlan connected? show vlan isnt doing that

thanks for looking into this.

Richard Burts · ‎03-08-2020

I do not have a suggestion of how to fix show interface trunk but I do have a suggestion of how to show which port has which vlan connected. Use the command show interface status and it will show for each interface which vlan it belongs to.

HTH

Rick

marce1000 · ‎03-08-2020

>when i get a blank output of the show int trunk, this means that the link is down.

Issue show int gix/y to get the status-parameters of a corresponding physical trunk link

>Also, how can i see, when using vlans, which port has which vlan connected? show vlan isnt doing that

show int status will provide this overview

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

AzzouzNetTech · ‎11-29-2024

Thank you! The issue of down links is the correct reason for why the show interfaces trunk command was showing a blank block for me in PT. I linked it to a router and activated the interface and the command worked as intended. Problem solved!

Richard Burts · ‎11-30-2024

Thanks for sharing your experience with the community.

HTH

Rick

Cristian Matei · ‎03-08-2020

Hi,

I would say that in the end, you want to see not only which interfaces are of which type (access or trunk) and in which VLAN's, but rather what traffic for which VLAN's is forwarded or not over a link. So i would use the following commands:

" show panning-tree vlan x", "show spanning-tree interface x/y", "show spanning-tree vlan x interface x/y"

Play around with the commands, for both access and trunk, and you'll figure out by yourself when to use which one.

Regards,

Cristian Matei.

Shane.walradt · ‎09-30-2022

If you don't see anything with the "show interface trunk" command it could be because your running on an older IOS. Try these two commands on your trunk ports to resolve this:

switchport trunk encapsulate dot1q

switchport mode trunk