Signaling MSD (Maximum SID Depth) using IS-IS
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This document proposes a way to expose Maximum SID Depth (MSD) supported by a node at node and/or link level by an ISIS Router. In a Segment Routing (SR) enabled network a centralized controller that programs SR tunnels at the head-end node needs to know the MSD information at node level and/or link level to push the label stack of an appropriate depth.