Shrikar,
This explains the reason:-
- Type 1 - Router LSA - the router announces its presence and lists the links to other routers or networks in the same area, together with the metrics to them. 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 (DR) 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.
Simple term :
1- Router LSA are sent by every router in the same area you are correct.
2- But what happens in the Ethernet segment of the same area? You are aware that there comes the concept of DR and BDR, Who is responsible to send/advertise/send the infomration of DR and BDR to all the routers belongs to that segment? The router LSA would not be having the infomration of DR and BDR right....
http://en.wikipedia.org/wiki/Link-state_advertisement
If you still not convinced let me know and I will try to explain in other way than technical terms.
Regards
Inayath
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