Patent ID: 9444677
Filing Date: 2016-09-13
CPC Classification: H04L

Claim Text:
1. A method comprising: generating, by a first provider edge router associated with a first segment identifier, a primary label identifying the first provider edge router as a primary egress router for reaching a destination, and a repair label identifying the first provider edge router as a backup egress router for reaching the destination if a second provider edge router associated with a second segment identifier is unavailable to reach the destination; advertising in a core network, by the first provider edge router, the first segment identifier for reaching the first provider edge router in the core network; and sending via the core network, by the first provider edge router, an advertisement specifying the primary and repair labels, enabling an ingress provider edge router to insert, into an IPv6 data packet, selected primary and repair labels from the first and second provider edge routers and a segment routing-typed IPv6 extension header specifying the first and second segment identifiers and a protected flag, for fast rerouting by a core router in the core network to the destination via one of the first or second provider edge router if the other is unavailable, wherein the first and second segment identifiers enable segment routing of the IPv6 data packet by the ingress provider edge router and the core router in the core network without hop-by-hop signaling.