Multi-Part TLVs in IS-IS
RFC 9885, “Multi-Part TLVs in IS-IS”, is a Proposed Standard document published in October 2025 by P. Kaneriya, T. Li, A. Przygienda, S. Hegde, L. Ginsberg. The canonical text is published by the RFC Editor.
Abstract
New technologies are adding new information into IS-IS while deployment scales are simultaneously increasing. This causes the contents of many critical TLVs to exceed the currently supported limit of 255 octets. This document codifies the common mechanism of extending the TLV content space through multiple TLVs.
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 9885 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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- RFC 9882 Use of the ML-DSA Signature Algorithm in the Cryptographic Message Syntax
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- RFC 9889 A Realization of Network Slices for 5G Networks Using Current IP/MPLS Technologies
- RFC 9890 An Update to YANG Module Names Registration