Following are the types of LSAs you would usually find in an OSPF network: Type 1: router LSA — A router sends this to describe neighbors and its own interfaces. Type 2: network LSA — For broadcast networks only; this LSA is flooded by the DR and lists OSPF-speaking routers on the network. Type 3: network summary LSA — Sent by an ABR to advertise networks reachable through it. A stub area router will also use this for the default route. Type 4: ASBR-summary LSA — Sent by ABR, but only internally. This describes to the others how to get to the ASBR itself, and uses only internal metrics. Type 5: AS-external LSA — Used to describe external routes to internal areas. Can be used to advertise “this is the way to the Internet” (or some subset of). Type 6: Group summary — Used in multicast (MOSPF). Ignore this.Cisco Routers does not support LSA6. Type 7: NSSA area import. Type 8: External Attributes LSA –- This is very rarely deployed and is used when BGP information is carried across OSPF AS. Type 9, 10, 11 are Opaque LSAs — They are designated for future specifically for application specific purposes.

Following are the types of LSAs you would usually find in an OSPF network: <b>Type 1:</b> router LSA — A router sends this to describe neighbors and its own interfaces. <b>Type 2:</b> network LSA — For broadcast networks only; this LSA is flooded by the DR and lists OSPF-speaking routers on the network. <b>Type 3: </b>network summary LSA — Sent by an ABR to advertise networks reachable through it. A stub area router will also use this for the default route. <b>Type 4: </b>ASBR-summary LSA — Sent by ABR, but only internally. This describes to the others how to get to the ASBR itself, and uses only internal metrics. <b>Type 5:</b> AS-external LSA — Used to describe external routes to internal areas. Can be used to advertise “this is the way to the Internet” (or some subset of). <b>Type 6:</b> Group summary — Used in multicast (MOSPF). Ignore this.Cisco Routers does not support LSA6. <b>Type 7:</b> NSSA area import. <b>Type 8: </b>External Attributes LSA –- This is very rarely deployed and is used when BGP information is carried across OSPF AS. <b>Type 9, 10, 11</b> are Opaque LSAs — They are designated for future specifically for application specific purposes.