i got a weird one with ospf. i setup ospf on two core switches dual connected to two routers (the core routers do not have a connection) all running ospf. when i do a show ip route ospf on the routers, the only routes it sees are the directly connected interfaces. (no ospf routes are learned) UNLESS i specifically make all the interfaces of the routers ospf interfaces
ex. (no ospf routes are learned if I use this config)
routerA: router ospf 1 network 10.1.1.1 0.0.0.0 area 1
if I use
routerA: router ospf 1 network 0.0.0.0 255.255.255.255 area 1 (basically means all interfaces, i think)
ospf routes are learned!!