IP Fast Reroute , LFA (Loop Free Alternate) , Remote LFA and in general recovery and protection discussion. In this post, I will share the discussion with one of my slack group member, Driss Jabbar. He is a CCDE and highly skilled network engineer and also author of some posts in this website. You can contact him on Linkedin. Read more
Ring topology is used mostly for economical reason. It is very common topology in the service provider access, and it is not so uncommon in Aggregation and Core ( Backbone ) networks as well.
Long haul links are expensive thus in order to provide last mile connectivity in the Service Provider access domain, nodes might be connected to the closest nodes which have similar functionality. Read more