'show interface trunk' output is blank

[Enki Doe]

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]

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.

[marce1000]

>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.

[AzzouzNetTech]

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]

Thanks for sharing your experience with the community. 

[Cristian Matei]

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]

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