Techniques for exposing maximum node and/or link segment identifier depth utilizing IS-IS

摘要

Techniques for exposing maximum node and/or link segment identifier depth using IS-IS are described. A network element in a Segment Routing (SR) network transmits a Type Length Value (TLV) element including a Maximum Segment Identifier Depth (MSD) value. The MSD value identifies a maximum number of segment identifier (SID) labels that the network element is able to push into packet headers of received packets to enable forwarding of the received packets through the SR network. The network element receives, from a controller, data for a path to be utilized by the network element for forwarding the received packets through the SR network. The data includes one or more SID labels to be pushed into the received packets, and the SID labels include fewer than or equal to the MSD value. The controller and the network element do not utilize the Path Computation Element Protocol (PCEP) over a southbound interface.