Sunday, July 8, 2018

Ethernet Ring Topology

Hi all!

Lately, I’ve been seeing questions here from people with “ring” topologies on their internal LANs. Now, I know that WANs are often built in rings, but it would never occur to me to wire up, say, the 10 network distribution racks around my office in a ring. Naive reasons:

  1. More hops/latency to the core
  2. Less aggregate bandwidth (shared 10Gbps instead if each cabinet betting 10Gbps)

And what scares me the most:

  1. The (perceived?) MUCH higher possibility of L2 loops.

Has this always been a thing? Thinking back 20 years, this topology was never suggested in any Cisco courseware I’ve seen.

Any thoughts?



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