Q. Is there a definitive OSPF adjcency limit you should work to for a router?
I ask after seeing a core network with 6509-NEB-A's chassis seeing CPU spikes for long periods (causing network melt down!) due to excessive OSPF algorithm. Adjacencies reached several 100 per node. Passive-interface config was used in this instance to remove duplicate adjcencies between SVIs that were not required.
But if these are genuinely needed (such as many GRE tunnel /30s or high capacity line cards with many /30 connections being terminated), passive-interfaces would not be an option.
Is there a better solution to having adjacencies (without static routes everywhere), or is this just a limit to the routing protocol?
Any advice welcomed.