Advanced OSPF - Link-State Advertisements

6 important questions on Advanced OSPF - Link-State Advertisements

What is the function of the OSPF Type 1 Router LSA?

Type 1 router LSAs are send by each router within an area. The LSA contains the OSPF enabled links (Interface and attached networks)

What is the function of the OSPF Type 2 Network LSA?

It is sent by the DR on a mutli-access network segment.
It identifies all the routers attached to that segment.

What is the function of the OSPF Type 3 Summary LSA?

OSPF Type 3 LSAs are sent by Area Border Routers (ABRs).
They create OSPF Type 3 LSAs for on Area from Type 1 LSAs they receive on another area.
They als create OSPF Type 3 LSAs from Type 3 LSAs received from the Backbone Area 0
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What is the function of the OSPF Type 5 AS External LSA?

OSPF Type 5 LSAs are created by Autonomous System Boundary Routers.
They use it to inject redistributed routes into OSPF.
Type 5 LSAs are flooded over different areas, through the whole OSPF Domain.

What is the function of the OSPF Type 4 ASBR Summary LSA?

OSPF Type 4 LSAs are created by Area Border Routers (ABRs)
They are created for each Type 5 LSA and it contains a route to the ASBR that created the original Type 5 LSA.

What is the function of the OSPF Type 7 NSSA External LSA?

OSPF Type 7 LSAs are created by Autonomous System Boundary Rouers in a Not-So-Stubby Area or NSSAs.
ABR creates Type 5 LSA from Type 7 LSA
Next ABR adds Type 4 LSA

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