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Control-Plane: Routing Protocol Changes A router must know If a neighbor can redirect U-turning traffic on a particular interface Interface-wide capability - not tied to particular traffic prefixes And the policy configuration that neighbor has for using its interfaces as alternates. Assumes operator has administrative control to disallow using an interface as an alternate. Signal this information via a new Link Capabilities sub-TLV in IGP: 1 bit : U-turn capable recipient 1 bit : Eligible Alternate No additional signaling required based on topology changes (i.e. at time of failure or after). |