05-19-2008 06:23 PM - edited 03-05-2019 11:05 PM
Hello all:
I will soon have a trunk configured with a metro provider so they can pass vlans from my customers to my network. I will be using a 3560E switch and want to know if I could enable a vlan interface without having to actually utilze a physical port to that vlan.
Right now if I do not assign a physical port to a vlan, the vlan interface show up but protocol is down. For some clients I do not need to use any physical ports as I am just routing traffic received on the trunk link to a different vlan on the same switch. So those vlans don't need to really use a physical port.
This should be possible to do right??
Thanks in advance.
Solved! Go to Solution.
05-20-2008 05:29 AM
the vlan interface will be in a up/up state automatically or is there more to configure then that?
As long as you don't prune that Vlan on the trunk, it should work as I described.
HTH,
__
Edison.
05-19-2008 07:55 PM
You can have that Layer3 Vlan interface in up/up state with a switchport configured as trunk and that vlan in forwarding state within that trunk.
HTH,
__
Edison.
05-19-2008 08:28 PM
So what you are saying is that once the dot1q trunk is configured with the metro provider, the vlan interface will be in a up/up state automatically or is there more to configure then that?
05-20-2008 05:29 AM
the vlan interface will be in a up/up state automatically or is there more to configure then that?
As long as you don't prune that Vlan on the trunk, it should work as I described.
HTH,
__
Edison.
05-19-2008 09:43 PM
That's what he's saying :)
05-19-2008 10:44 PM
The interface and line protocol comes up "up/up" also by creating a virtual interface and assigning it an ip address.
Example:
interface vlan 500
ip address x.x.x.x y.y.y.y
Please rate if it helps.
Thanks,
Deejay
05-20-2008 05:27 AM
The interface and line protocol comes up "up/up" also by creating a virtual interface and assigning it an ip address.
Sorry, but that's incorrect. The SVI (Switch Virtual Interface) relies on a physical port being on active state (up/up) that belongs to that Vlan or a trunk configured on that switch with the Vlan in forwarding state.
If the example above worked for you, most likely you have a trunk on that switch and Vlan 500 is in forwarding state. You can verify this behavior with the show int trunk command.
HTH,
__
Edison.
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