I have four routers: one is 1811 and three 871. I want to configure dynamic routing between them and I choosed OSPF to do that. Because of that routers doesn't have layer 3 FE interfaces but only 8 or 4 port switch interfaces, i am not sure how to do the dynamic routing. I configured Vlan 99 on all of the routers and connected the three 871's to 1811.
To understand me better i attach a picture of the topology!
So with this topology shoul i disable split horizon on int vlan99 at 1811 router??? I think i have to disable it because routing updates from any of the 871 routers will not be redistributed.