Trunking VLANs over Layer 3 OSPF links.
What is the best way to trunk a Layer 2 VLAN over a routed layer 3 network? I have a problem whereby the network is split up into 3 seperate sites, each site has a number of VLANS which are routed using OSPF and Cisco layer 3 switches.
There are 2 VLANS which need to span ALL sites and can not be split into different IP segments.
Is it possible to just Trunk the VLANS over the current Layer 3 links? We are using a mixture of Cisco 6500, 3550 and 3750 switches to do the switching and routing.
There is only 1 physical connection between the sites.