Hello everyone. We have a small WISP network (125 subscribers, about 10 radios running from 2.8.5 to 2.9.38). All 125 subs connect via PPPoE. We've recently decided that it might be worth it to add some redundancy to our backhaul. We now have two ways back to our core routers where we service the majority of our other customers (DSL, cable modem, FTP). Anyway, this information is all irrelevant to my question.

We have set up a test scenario in our lab to figure out the best way to accomplish automatic failover if we were to lose our primary backhaul. We have 5 radios that we've named from 0-4. Currently, only 0-2 are turned on.

We are trying to setup OSPF and we have successfully done so. All routes are redistributed as expected. Unfortunately, what we do not want is all the /32 routes to the connecting PPPoE clients to redistribute to ALL routers. We simply want the network of the pool to be distributed (which it is). Is there any way to suppress this in the radios?

We've been able to filter them out with a cisco route-map, but that doesn't really save any memory or routing time. It just cleans up the routing table. I was also under the impression that prefix lists only are usable with RIP and BGP. When a client connects via PPPoE, I do not want the route for that client distributed to ALL routers in the area.

Thanks,
Eric

Ok, I figured out how to do it with separate areas for PPPoE pools and an area range. However, the routing ospf area range command is only available in 2.9 and above. I have about 7 radios still running 2.8.5. Anyone have any idea how to do the same thing in 2.8.5?

you can use a prefix filter that does not export any routes for that network that are not greater than a /32