Saturday, October 20, 2007

OSPF route filtering and area border routers

OSPF routes should be filtered or summarized at area border routers.


Saturday, October 6, 2007

OSPF distribute-list problems

OSPF's fundamental design is that all routers in an area have the same exact view of the network topology. This is fundamentally incompatible with filtering routes within an area. As a result OSPF distribute lists do not have the same effect as RIP distribute lists. In fact, using distribute-lists within an OSPF area is dangerous.