Table of Contents
Is OSPF intra or inter?
Both Intra and Inter-Area routes are also called OSPF Internal routes, as they are generated by OSPF itself, when an interface is covered with the OSPF network command.
What is oe1 and oe2 in OSPF?
Basically the difference between E1 and E2 external routes is: E1 includes – the internal cost to ASBR added to the external cost, E2 does not include – internal cost. it is same as external cost.
What is summary address in OSPF?
The summary-address command works by summarizing external routes. Try “redistributing connected subnet” on the spoke and make sure you don’t advertise the loopbacks into OSPF as internal OSPF routes.
What is OIA in OSPF?
Intra Area routes are the “O” routes that you see in the routing table. These routes are routes that are in the same area. Inter-area routes are the “O IA” routes that are learned in different areas.
What is a stub area?
A stub area is an area in which advertisements of external routes are not allowed, reducing the size of the database. A totally stubby area (TSA) is a stub area in which summary link-state advertisement (type 3 LSAs) are not sent.
Why is OSPF divided into areas?
In OSPF, a single autonomous system (AS) can be divided into smaller groups called areas. This reduces the number of link-state advertisements (LSAs) and other OSPF overhead traffic sent on the network, and it reduces the size of the topology database that each router must maintain.
Why is Area 0 backbone area in OSPF?
An OSPF routing domain (AS) can consist of a single area, but in that case the single area must be Area 0. Only the backbone area can generate the summary routing topology information that is used by the other areas. This is why all interarea traffic must pass through the backbone area.
What is Asbr in OSPF?
An Autonomous System Boundary Router (ASBR) is a router that is running multiple protocols and serves as a gateway to routers outside the OSPF domain and those operating with different protocols. The ASBR is able to import and translate different protocol routes into OSPF through a process known as redistribution.
What is stub area in OSPF?
An OSPF stub area is an area that does not permit flooding of AS external link state advertisements. It only receives routing information for destinations within the same stub area and for destinations in other areas within the OSPF domain.
Can we use OSPF without Area 0?
No. OSPF requires that there be an area 0 for routing between two different areas.