OSPF: Difference between revisions

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  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 via a type 1 LSA with the E flag set(which does not constitute a type 4 LSA) sent into backbone area 0.
- 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.
  The only type 4 LSA generated in this example is sent from router C into area 2,