See attached drawing, please.
I have about 300 vlans that terminate on the WSR01 and WSR02 routers on site 1. We want to integrate those vlans into the routed domain of the site 2. Thats why we have the routed ethernet connection in BLUE.
Here is the challenge. In addition to those 300 VLANs that are already terminated on the WSR routers, there will be 4 more management vlans, and with those vlans, we may want to extend them across the inter-site link and would like to terminate them (create the L3 interface for them) on switch 1 and 2 at site 2.
One client engineer is proposing the following: That instead of terminating the ethernet inter-site link on routed interfaces at both ends, that we do so instead on switched interfaces, make it a trunk, pass the management vlans and extend them across to the other site. And instead of using routed interfaces, we just use the old SVI on each router method to extend the /30 point-to-point vlan, thereby allowing routing updates to pass for the other 300 vlans that we do NOT want to extend pass those WSR routers.
Does this make sense?