The Area Border Router (ABR)
Connects an area (or areas) to the backbone.
Summarizes its area topology to the backbone.
Propagates summarized information from the backbone into its area.
Final router that receives an area’s LSA.
- ABRs do not flood LSA information into the backbone
- Only produces summaries to the backbone for the backbone to propagate to other areas
Uses the network summary LSA.
Summarized information is propagated in an area by the DR and its adjacencies.