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Types of OSPF LSA's

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beef410's version from 2018-04-05 14:45

LSA's

Question Answer
Type 1Router Link Advertisement - Per area
Type 2Network Link Advert. - Generated by DR's - Same area has DR/BDR info
Type 3Summary Link Advert. - Generated by ABR's every 30min - Sends to area external to where they were generated. Provides inter-area routes to backbone
Type 4Summ. Link to ASBR's - Generated by ABR's informs how to reach ASBR
Type 5AS External Link - Sent by ASBR's to advertise routes external to the OSPF AS, one per external network, flooded everywhere
Seq NumSame new LSA is ignored, if an older one arrives recipient will send its newer revision to original sender
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