Splitting vlan traffic from a single source?

[meng-wee_soh]

Hi all,

I've have attached a diagram to help explain the question better.

Current situation

Currently I have a offsite office (building B) which is connected to the main office (building A) via a 100MB Metro-E layer 2 connection.

This connection carries both data (vlan53) and voice traffic (vlan505) to a layer 3 switch. The layer 3 switch carries other vlans within Building A too.

The callmanager is located in Building A.

Offsite office communicates with the rest of the offices via MPLS_1 by Provider A.

Question

Now, there is a need to route the data traffic from Building B such that it only routes via MPLS_2 (separate VRF by same provider) to communicate with the rest.

It should not be going to anywhere else.

For voice, the office is still dependent on the call manager in Building A.

Is it possible that I use a new connection from the layer 3 switch (fa5/1) to the router (fa0/2) to force the vlan53 traffic to MPLS_2 while the rest remains status quo.

If yes, how can it be done? Is it by using policy routing or something similar?

Thanks!

[nkarpysh]

Basicaly you need to have a L2 trunk to provider where you will allow only this VLAM 53. Provider then on their PE device connected to your L3 switch (CE) will have SVI 53 which it will put in your VRF.

This is how it is usually done. If you already have L2 link to provider then you can just add this VLAN to it.

L3 link will stop all L2 broadcasts. Thus if you want to SPAN this VLAN 53 across the MPLS - you will need to build VPLS. That is actually service which should be provided by SP. You again will need L2 trunk connected to them.

If you want just to reroute the traffic from VLAN 53  to MPLS you can build SVI on your L3 switch and configure static route to SP MPLS PE.

Hope it helps,

Nik

[Anand Ram]

Adding to Nikolay's point,

The configuration and design would be dependent on what kind of VPN service is provided by the SP and what routes you receive from the SP.

Assuming that you have a L3 VPN service with the service provider, you dont need any VRF configuration anywhere your network. You just need to route the data traffic 'right' i.e. to the SP PE on MPLS_2 cloud. So you have to have the route for data networks received from MPLS_2 cloud.

Regards,

Anand