[c-nsp] L3 VLAN showing up but no physical interface bound or physical interface down.

[Marko Milivojevic]

Could you verify absence of negotiated trunks by running "show int trunk"? It is sometimes easy to miss trunks that should have not been trunks...

-----Original Message-----
From: Drew Weaver [mailto:drew.weaver at thenap.com] 
Sent: 22. janúar 2008 14:41
To: Marko Milivojevic; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] L3 VLAN showing up but no physical interface bound or physical interface down.


        I apologize I should've clarified that we aren't doing any kind of trunking. Pretty much all of the VLANs we're doing are very simple switchport, switchport access vlan x type VLAN/interface configurations.

Thanks,
-Drew

-----Original Message-----
From: Marko Milivojevic [mailto:markom at vodafone.is]
Sent: Tuesday, January 22, 2008 9:23 AM
To: Drew Weaver; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] L3 VLAN showing up but no physical interface bound or physical interface down.


If I'm not much mistaken, VLAN will be up if you have any trunks that "contain" it up. Are you sure that you are not running unliminted trunks on the switch, causing SVI to be up?


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Drew Weaver
Sent: 22. janúar 2008 14:27
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] L3 VLAN showing up but no physical interface bound or physical interface down.


                Hi there. We have seen this issue on two separate Catalyst 6500s in the past two weeks or so, we've noticed that on occasion either with a Layer 3 VLAN with no FastEthernet/GigabitEthernet port attached to it, or with one attached to it which is either down or administratively shutdown that the Layer 3 VLAN refuses to notice that it should in fact "give it a rest" as they say. Has anyone seen anything similar to this in the past. We aren't running VTP or any multi-switch/campus wide VLANs. All of our VLANs are contained intra-switch. Both switches are running the same version of code. The only remedy we've found for solving this issue is to simply blow away the VLAN (which is usually what we're trying to do when we notice this anyway), but we are a little concerned by what could be the cause.

Thanks.
-Drew

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