Hi, OSPF requires all areas to be connected via the backbone. I wanted to understand why we have this requirement since IS-IS doesnt mandate such a thing.
I understand that all the border routers summarize and inject the summary routes inside the backbone. The backbone then does "distance vector routing" and injects those summaries to other areas. How does having a backbone eliminate loops is something that i dont understand. Can somebody explain that to me? -- Toms.
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