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jny
New Member

I need to see what VLAN-ids are present on a trunk interface. What debugs would help me achieve this?

Currently, i have an Cisco IE3000 switch, with an interface defined as a trunk. The other end is unknown to me, but I know it transmits tagged frames. I just don't know which VLAN-ids are in use - so I was thinking on doing some debugs to learn the VLAN-ids.  Remote end does not transmit BPDUs

  • LAN Switching and Routing
Everyone's tags (1)
1 ACCEPTED SOLUTION

Accepted Solutions

Hey,Best option would be if

Hey,

Best option would be if you can configure SPAN and capture the traffic also make sure to use encapsulation replicate keyword while configuring in order to preserve vlan tags.

HTH.

Regards,
RS.

6 REPLIES

Hey,Best option would be if

Hey,

Best option would be if you can configure SPAN and capture the traffic also make sure to use encapsulation replicate keyword while configuring in order to preserve vlan tags.

HTH.

Regards,
RS.

jny
New Member

Wireshark locally on the

Wireshark locally on the switch is not possible.   The switch is inaccessible.  I don't believe that RSPAN supports encapsulation replication. At least not on the IE3000

Silver

 You may be able to do 'show

 

You may be able to do 'show mac-address-table' and see what VLANs appear under the VLAN column for the port in question.

HTH.

jny
New Member

That would require me to

That would require me to define all VLANs, which may be to much for the IE3000. It supports only 1005.

A debug telling me that a packet have been dropped because the VLAN is not defined - would be the way...

 

 

 

4 times to see all 4000 vlans

4 times to see all 4000 vlans

Helloshow interface trunk

Hello

show interface trunk

 

res

paul

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