IS-IS EXTENSIONS FOR FLEXIBLE PATH STITCHING AND SELECTION FOR TRAFFIC TRANSITING SEGMENT ROUTING AND MPLS NETWORKS

摘要

A router operates in both a Segment Routing (SR) network portion and a Multiprotocol Label Switching (MPLS) network portion of a network that utilizes Intermediate System to Intermediate System (IS-IS). The router receives an IS-IS advertisement message originated by a mapping server that includes a sub-Type-length-value (sub-TLV) element that identifies a preferred type of path across the MPLS network portion for an identifiable set of traffic to be received by the router from the SR network portion. The router identifies, based at least in part upon the sub-TLV element, one path of a plurality of available paths across the MPLS network portion for the identifiable set of traffic, and configures its forwarding plane to utilize the identified one path for the identifiable set of traffic. The IS-IS advertisement message can be an IS-IS TLV such as a SID/Label Binding TLV 149 or Multi-topology SID/Label Binding TLV 150.