LSA Types

The OSPF LSDB is made up of LSAs.

There are 11 types of LSA, but there are only 3 you should be aware of for the CCNA:

  1. Type 1 (Router LSA)

  2. Type 2 (Network LSA)

  3. Type 5 (AS External LSA)

Type 1

  • Every OSPF router generated this type of LSA.

  • It identifies the router using its router ID.

  • It also lists networks attached to the router's OSPF-activated interfaces.

Type 2

  • Generated by the DR of each 'multi-access' network (ie. the broadcast network type).

  • Lists the routers which are attached to the multi-access network.

Type 5

  • Generated by ASBRs to describe routes to destinations outside of the AS (OSPF domain).

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