3.5.b [iii] OTP route-reflector peering
OTP offers Route Reflectors (RRs) to form a half-mesh topology and ensure connectivity among all sites in the network. A Route Reflector is an EIGRP peer that receives route updates from remote sites and “reflects” the routes to other sites. Route Reflectors are configured using the keyword “unicast-listen”. This option enables the Route Reflectors to listen for unicast Hello messages from other sites, and upon receiving the first Hello message, automatically forms a peering relationship. OTP supports the use of dual or multiple Route Reflectors for redundancy.
OTP RRs should have split horizon disabled in addition to next-hop-self.
Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 3078-3083). . Kindle Edition.