Phil
I do not believe that there is a definitive limit on the number of OSPF adjacencies per router. As you have discovered it is certainly possible to overload a router by creating too many adjacencies. But the limit will depend on multiple factors including what router plarform, how much memory that router is provisioned with, what other features are enabled on the router, what is the size of the routing table, and what is the size of the OSPF data bases. It may also depend on how OSPF is configured:
- the worst case is to have many neighbors all in the same area.
- slightly better is to have many neighbors with neighbors belonging to multiple areas on the router.
- even better is to have many neighbors with neighbors belonging to multiple areas and to have all non-backbone areas configured as totally stubby.
So are there limits - yes there certainly are.
Are there definitive limits, no there are not.
HTH
Rick
HTH
Rick