SR Path List - Loose Mode Support

The segment routing architecture enables ingress nodes in a core network to steer traffic through explicit paths through the network. The segment routing-traffic engineering (SR-TE) next hop is a list or lists of segment identifiers (SIDs). These segment lists represent paths in the network that incoming traffic should take. The incoming traffic may be labeled or IP traffic and the forwarding operation at the ingress node may be a label swap or a destination-based lookup to steer the traffic onto these SR-TE paths in the forwarding path. This feature introduces support for segment lists with loose next hops. Following enhancements introduced by this feature, each hop must be an IPv4 address and can be of type strict or loose. If the type of a hop is not configured, strict is used.