Hi,
We currently run a fully routed network assigning each customer public IP Addresses.
Ignoring the core of our network, on our WISP we are running OSPF and MPLS, we have a local PPPoE Server on each NAS.
Most locations use an 1100Ahx2 as the NAS, however some have been upgraded to CCR’s.
My question is, as our route table approaches 2000+ routes, how scalable is this in OSPF. Should we be looking for centralised PPPoE Servers in the core to provide less routes in OSPF?
Any help would be greatly appreciated.
Kind Regards
Mike
Break OSPF into areas to reduce computational load. Try your best to organize an address plan that can take advantage to summaries where-ever possible. I get this is real life and things can’t always be broken into clean summarized networks but any progress towards this will help.
Another common solution would be to use BGP over OSPF.
You let OSPF manage the reachability from a router to another, then route all the customers prefixes with BGP which is lighter on updates.
You only need a centralized BGP route-reflector (better two), it can be an existing router.
In this way we manage hundreds of NAS and thousands of customers without a hitch.
I would avoid the PPPoE centralization because it requires you to have L2 links over the whole network thus adding overhead and losing routing advantages between customers.
We used to have it but we had to abandon it for scalability issues.