OSPF Router Types Flashcards
Why do different OSPF router types exist?
because routers can assume different roles or types based on their function and position within the OSPF network
What are the different router types?
- Internal Router
- Area Border Router (ABR)
- Autonomous System Boundary Router (ASBR)
- Backbone Router
- Designated Router (DR)
- Backup Designated Router (BDR)
- Virtual Link Router
- Internal Area Border Router (IABR)
Describe the Internal Router Type
- router that has all of its interfaces within the same OSPF area
- responsible for routing traffic within a single OSPF area and have a complete view of the area’s topology
Describe the Area Border Router (ABR) Router Type
- router that connects two or more OSPF areas
- has at least one interface within one area (usually Area 0, the backbone area) and one or more interfaces in other areas
- data traffic between areas (inter-area) passes through an ABR
What is the role of Area Border Router (ABR)?
ABRs play a critical role in summarizing and redistributing routes between OSPF areas, helping to control the flow of routing information between areas
Describe the Backbone Router Router Type
router that has all of its interfaces within the OSPF backbone area, which is typically Area 0
What is the role of the Backbone Router Router Type?
responsible for maintaining the backbone area’s integrity and facilitating OSPF routing between non-backbone areas
Describe the Autonomous System Boundary Router (ASBR) Router Type
router that connects the OSPF routing domain to an external routing domain or a different autonomous system
What is the role of Autonomous System Boundary Router (ASBR) Router Type?
- redistribute routes learned from outside the OSPF domain into OSPF
- responsible for importing and exporting routes between OSPF and other routing protocols or domains
What does ASBR redistribute into OSPF? (3)
- Interior Gateway Protocol (IGP) routes
- static routes
- connected routes
