What is a recommended way (in terms of maintenance, simplicity and failsafe-ness) to essentially run a "ring" of switches, but allowing OSPF to run properly (so equal-cost-path routing can work - in picture, for SW4)?
My setup is as follows:
- Each site has a switch (to which each inter-site link is connected - fiber or wireless)
- Each site has a router that is only connected via a single interface (doing routing in VLANs)
- Each site has a VLAN group on the switch to which CPEs connect, and that VLAN is then routed by the router
- each router runs OSPF to route between subnets
I have tried running MSTP (with a separate VLAN per link), but I don't seem to get it properly to handle the point to point links, and all common examples on the internet is "enterprise" type - run all the VLANs on all the switches.
Is there some other protocol that would suit the setup better? Is there a fundamental design flaw in my thinking? With MSTP, can different switches have different VLANs or is the protocol fundamentally for running all the VLANs over all the switches in a region?
Thanks in advance.