I'm getting stuck into the finer details of lsa's. I understand why lsa type 4 ASBR summary is needed..but i've a lingering question. If R1 is an ASBR in area1..won't R2 in say area2 know of R1's routes via the 'normal' route summarisation flooding between areas ? So won't R2 know that the route to the ASBR is via the ABR joining area 0 with area 2 ? Why is an lsa type 4 needed ???
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