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Q.

What exact lsa type you can see in different areas?

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Asked by Srivatsa Tatti, 01 Dec '09 07:16 pm
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Answers (2)

1.

Type 1 - Router LSA - the router lists the links to other routers or networks in the same area, together with the metric. Type 1 LSAs are flooded across their own area only. The link-state ID of the type 1 LSA is the originating router ID.
Type 2 - Network LSA - the designated router on a broadcast segment (e.g. Ethernet) lists which routers are joined together by the segment. Type 2 LSAs are flooded across their own area only. The link-state ID of the type 2 LSA is the IP interface address of the DR.
Type 3 - Summary LSA - an Area Border Router (ABR) takes information it has learned on one of its attached areas and it can summarize it (but not by default) before sending it out on other areas it is connected to. This summarization helps provide scalability by removing detailed topology information for other areas, because their routing information is summarized into just an address prefix and metric. The summarization process can also be configured to remove a lot of detailed address ...more
Answered by Josna, 01 Dec '09 07:33 pm

 
  
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2.

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 ASBR 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 ASBR, 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).
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 ...more
Answered by Deepak Joshi, 01 Dec '09 07:31 pm

 
  
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