How do you set not so stubby area?

How do you set not so stubby area?

To configure OSPF stub areas:

1. On all routing devices in the area, configure an OSPF stub area.
2. On the ABR, inject a default route into the area.
3. (Optional) On the ABR, restrict summary LSAs from entering the area.
4. If you are done configuring the devices, commit the configuration.

What types of LSAs are present in a not so stubby area?

Not-so-stubby Areas An NSSA makes use of type 7 LSAs, which are essentially type 5 LSAs in disguise. This allows an ASBR to advertise external links to an ABR, which converts the type 7 LSAs into type 5 before flooding them to the rest of the OSPF domain. Type 3 LSAs will pass into and out of the area.

What is a totally stubby area in OSPF?

Stub area, also called stub area, the so-called stub area, means that the area does not accept any external routes of non-OSPF network, if it wants to reach those external routes, only Need to send it through the default route.

How do I set totally stubby area in OSPF?

To configure an area as a totally stubby area you’d execute the area # stub no-summary in OSPF router configuration mode on the ABR. Totally NSSA – Is an area that permits LSA’s 1, 2 and 7 while blocking 3 4 and 5. This stub area receives a default route from the ABR using a type 3 LSA.

What is NSSA and totally NSSA?

Totally Stub: Same as above, along with the filtering of LSA 3. NSSA: LSA 5+ LSA 4 are filtered in this area on ABR. This area can have ASBR. But the external routes are injected in this area by ASBR in the form of LSA 7, which is again converted.

What is the difference between a stubby area and a totally stubby 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.

What is stubby area?

What is backbone area?

Backbone Area The backbone area forms the central hub of an OSPF network. All other areas are connected to it, and inter-area routing happens via routers connected to the backbone area and to their own non-backbone areas. The backbone area distributes all routing information between the non-backbone areas.

What is a stubby area?

Why areas are used in OSPF?

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.