OSPF Router Types

 OSPF (Open Shortest Path First) routers are classified into four types:

Backbone Area Router: 

This is a router which resides in backbone area. The backbone area is set to area 0.

Backbone Area Router

Internal Router:

A router that has all its interfaces connected to a within same OSPF area is known as an Internal Router.

Internal Router

Area Border Router (ABR): 

An ABR connects OSPF areas to eachother. It acts as a bridge between the different areas, allowing the exchangeof routing information.

Area Border Router

Autonomous System Boundary Router (ASBR):

An ASBR connects an OSPF network to a different routing protocol, such as BGP (Border Gateway Protocol).

The ASBR acts as a gateway between the OSPF network and the external routing domain.

ASBR 

OSPF DR/BDR Elections

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