OSPF: Difference between revisions
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;Type 4 - ASBR summary LSA / ASBR Location
Same as summary LSA except the destination advertised by ABR is ASBR.
ABR which is in the same area as the ASBR will originate the Type 4 LSA.
The (assumed) presence of an ASBR is communicated from its immediate ABR (router B in this example) via a type 1 LSA with the E flag set (which does not constitute a type 4 LSA) sent into the backbone area 0.
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