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 !