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

[Drew Weaver]

                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