Hi all, if im joining 2 networks together, say one router is 192.168.1.1/30 and the other 192.168.1.2/30, would I need to addvertise this 192.168.1.0/30 network on both routers for them to be able to route other networks between them ?
First of all those networks are the same, so its not really different networks.
192.168. 1.00000001 <- First host .1
192.168. 1.00000010 <- Last host .2
192.168. 1.00000011 <- Broadcast .3
With Routing Protocols such as EIGRP and OSPF you are enabling the interface to participate in the routing protocol and not "advertising" a network per say. Don't get me wrong, you are advertising routes, I just think you are looking at this wrong. The network command enables an interface to participate.
This configuration basically says the interfaces with .1, .2, and .5 participate in eigrp. The result will be rtr2 will have an eigrp learned route for .4/30 and a directly connected for .0/30. rtr1 will have two directly connected routes for .0/30 and .4/30.
So to answer your questions eigrp must be enabled on any interface you want to participate in eigrp.
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