@techreport{mayer-ioam-gob-01, number = {draft-mayer-ioam-gob-01}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-mayer-ioam-gob/01/}, author = {Andrea Mayer and Stefano Salsano}, title = {{Global Opaque Block for IOAM Pre-allocated Trace Option}}, pagetotal = 16, year = 2026, month = mar, day = 18, abstract = {Extensible metadata carried within the IOAM Pre-allocated Trace Option (PTO) can support packet-level, flow-level, or path-level processing beyond per-node trace data. This document defines the Global Opaque Block (GOB), an extension to the IOAM PTO that introduces a single pre-allocated global metadata region placed between the PTO fixed header and the node data list. The GOB carries an explicit length and schema identifier, preserves the pre-allocated PTO processing model, and can be used to transport Extensible In-band Processing (EIP) Information Elements or other structured metadata formats.}, }