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see if a vlan is active

I have hp procurve switches on my network, I am trying to cleanup my vlan. Is there a tool to see if a vlan is active or not? I can see if ports are active but how about vlan?

thanks

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Adrian Cantrill

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Don Johnston

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officertango

ASKER

I would like to know which vlan is passing traffic, i know i can show port. I have HP procurve 5406.

Adrian Cantrill

HP-Switch(Config)#show vlan (Shows vlan ID, Name, Status, Voice and Jumbo support)

HP-Switch(Config)#show vlan ports a1 (Shows the vlans belonging to a1)

HP-Switch(Config)#show vlan 1 (Shows ports that are assigned to vlan 1)

Adrian Cantrill

Give those a try, i'm more of a cisco guy - but i assume they will provide the information you require.

Don Johnston

You could look at the port counters to see if any traffic is being passed on interfaces that are members of the VLAN.

Or you could create an ACL and apply it to the VLAN and check for any matches.

Other than that, I don't know of a command that will tell you if a VLAN is in use.

Rick_O_Shay

It might help you to narrow things down by checking for active entries for that VLAN/Subnet in the ARP table on your router/L3 switch and MAC address tables in the L2 switches.

This will tell you if there are any stations currently using that VLAN.
Just remember it is no guarantee that there are not inactive stations that might use the VLAN that are just down right now.

Don Johnston

A valid approach, but it would only show devices communicating with hosts on different VLANs.

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Rick_O_Shay

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