LISP Reliability Issue

Facebook adopts LISP which necessitates the use of three routers to connect from IPv6 Internet to Facebook's existing IPv4 platforms. The three routers are namely; Egress Tunnel Router (ETR), Exchange Tunnel Router (XTR) and Ingress Tunnel Router (ITR). Readers may refer to my earlier blog post at URL


There is a degradation in reliability as compared to a single router. Assuming each of the three routers has a reliability of 99.9 %, if cascaded together, the overall reliability of the routing system drops to 99.7 %. The down time will be increased from 8.76 hours to 26.28 hours in a year.

Can Facebook and other early LISP adopters accept the degradation ?

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