Extensions to IOAM Trace Option for Carrying Fixed-Size Data

In situ Operations, Administration, and Maintenance (IOAM) Trace- Option data defined in RFC 9197 is a variable-length data, the length of this kind of data varies with the number of transited IOAM-capable nodes and the selection of data fields processed by each IOAM-capable node. This document extends the IOAM Trace Option to carry a fixed- size data, the length of this kind of data is fixed once the selection of data fields processed by each IOAM-capable node is determined, and doesn't vary with the number of transited IOAM- capable nodes.