Signaling Maximum SID Depth Using IS-IS
RFC 8491, “Signaling Maximum SID Depth Using IS-IS”, is a Proposed Standard document published in November 2018 by J. Tantsura, U. Chunduri, S. Aldrin, L. Ginsberg. The canonical text is published by the RFC Editor.
Abstract
This document defines a way for an Intermediate System to Intermediate System (IS-IS) router to advertise multiple types of supported Maximum SID Depths (MSDs) at node and/or link granularity. Such advertisements allow entities (e.g., centralized controllers) to determine whether a particular Segment ID (SID) stack can be supported in a given network. This document only defines one type of MSD: Base MPLS Imposition. However, it defines an encoding that can support other MSD types. This document focuses on MSD use in a network that is Segment Routing (SR) enabled, but MSD may also be useful when SR is not enabled.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8491 is hosted at rfc-editor.org. Available in TXT,HTML.
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