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Joined: Tue May 10, 2011 6:11 am

Implementing Tower Redundancy w/ OSPF

Tue Oct 18, 2011 4:26 pm

We currently use OSPF to route our PtP /30 uplinks between our core and each tower site. Each tower site is equipped with a RB450G. We have several towers that we need to implement some type of redundancy on. We are thinking of deploying an additional pair of wireless backhauls (Canopy, UBNT, etc) between our main distribution tower and the remote tower. I would like to be able to automatically fail over to this second set of backhauls if the primary set goes down and so forth.

Can someone give me some pointers as to the best way to implement this type of redundancy?

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Re: Implementing Tower Redundancy w/ OSPF

Tue Oct 18, 2011 6:26 pm

If your using ospf you are already there. Just add additional /30 backhauls and when ospf sees that it has an alternate path it will automatically use it when necessary. We do this all the time and its very smooth.

Small catch - if you have more than 1 peer out a specific interface you must use a separate subnet for each. For instance, if you had a wan /29 subnet and you wanted to have 2 ospf peers on that same subnet it will not work. This is a bug - to work around it you just use a /30 for each peer on that interface and things work fine.
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