[c-nsp] IP LFA in ring topology

[Adam Vitkovsky]

Hi,
Is it possible to tune metric on links in ring to get the most nodes on the
ring protected by the LFA?


RFC 5286  
3.2. Node-Protecting Alternate Next-Hops
   For an alternate next-hop N to protect against node failure of a
   primary neighbor E for destination D, N must be loop-free with
   respect to both E and D.  In other words, N's path to D must not go
   through E.  This is the case if Inequality 3 is true, where N is the
   neighbor providing a loop-free alternate.

         Distance_opt(N, D) < Distance_opt(N, E) + Distance_opt(E, D)

     Inequality 3: Criteria for a Node-Protecting Loop-Free Alternate


adam