BGP egress peer engineering

BGP LS extensions are enhanced to export segment routing topology information to the controller. A centralized controller in a software-defined network (SDN) can program any egress peer policy at ingress border routers or at hosts within the domain in a segment routing network. The egress router advertises the peer node SID label for all its peers, and the controller advertises these SID labels to the ingress router. Thus the ingress router can select these SID labels to transfer data packets to the egress peers. The path that the controller derives can override the network derived best path. This feature can also be used in an inter domain scenario. To configure a peer node SID, include egress-te-node-segment-label at the [edit protocols bgp group group-name neighbor neighbor-name] hierarchy level. To configure a peer adjacency SID, include egress-te-adj-segment adj-segment-name at the [edit protocols bgp group group-name neighbor neighbor-name] hierarchy level. To create a peer set SID, include egress-te-set-segment set-segment-name label label-name at the [edit protocols bgp] hierarchy level.