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Best Practice Network Design for Multiple Backhaul Routing using Wireless, MLPPP, and PPP T1s.

semonet
semonet asked
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Last Modified: 2012-05-05
I'm looking for input pertaining to best practice for establishing a redundant backhaul system.

We have a primary wireless link from the office to the first tower. That tower then links to two other towers and those link to others creating a ring of linked Wireless towers which then backhaul from Tower 1 to the main office before being sent out the OC3.

We are attempting to create a sonet type routing solution so that when a wireless backhaul link fails, it reroutes the traffic over the second wireless link. Some towers would also have tertiary T1 links available when it or it's segment gets isolated from the rest of the ring. The T1 links terminate to the core router at the office.

We use Cisco routers at each tower location and we are looking for assistance in determining the best routing protocol to accomplish this and how to implement it.

Initial thoughts were leaning to weighted static routing or possibly OSPF.  I've also included an image for further clarification.
Routing-Topology.png
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Commented:
If someone could point out the critical details as to what is missing, I would appreciate it.

More details below that will hopefully spur a comment.

OSPF is currently established on the T1 links from the core to the towers and is being used as the primary backhaul. We want to force the T1s to be the last choice of backhaul, using the wireless links when possible.

Right now all OSPF is configured to use Area 0, and includes the network statement for the link as well as the following lines:

router ospf 1
 log-adjacency-changes
 redistribute connected subnets
 redistribute static subnets

OSPF was configured by a previous employee on R0-R3
Top Expert 2008
Commented:
This one is on us!
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