OSPF - network command in ‘router ospf’ vs redistribute connected

For years we only had an area 0 and had “redistribute connected subnets” for the access layer and a mix of “network 172.... area 0” or “ip ospf area” interface commands for core links.

I read this decade old article and wanted to share it: ospf and connected networks.

The big take away for me: redistribute connected creates ex2 type routes and you can’t summarize those on ABRs. Using the network command creates IA routes which you can summarize (Just started splitting out network into geographic areas.)

We are cleaning up a decades work of “organically configured” OSPF and it has been fun.