OSPFv3 LSA id Field

Unanswered Question
Jul 12th, 2010
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I'm reading about OSPFv3, I would like to understand the idea of LSA ID field.

I find out the following documentation about OSPFv3


In page 3 the table 9-2, the author match all LSA ID with there meaning, remark the line about AS-External LSA as been set to 0X4005. All other LSA ID as an ID in the 0X200x scope.  In the previous page the author as talk about the U bit and S1 and S2 bit.  I find so bizzard all of LSA type as not the U bit set except for the AS-External LSA type and also no S1 and S2 as been set for thoses LSAs.

Was I missed understood something ?  Someone could explain to me ?

Thanks a lot !

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