In Situ OAM (IOAM)

Created

2021-12-20

Last Updated

2026-07-31

Available Formats

IOAM Option-Type

Registration Procedure(s)

IETF Review

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)

Available Formats

CSV

Code Point	Name	Description	Reference
0	IOAM Pre-allocated Trace Option-Type	See RFC 9197, Section 4.4.1	RFC 9197, Section 4.4.1
1	IOAM Incremental Trace Option-Type	See RFC 9197, Section 4.4.1	RFC 9197, Section 4.4.1
2	IOAM POT Option-Type	See RFC 9197, Section 4.5	RFC 9197, Section 4.5
3	IOAM E2E Option-Type	See RFC 9197, Section 4.6	RFC 9197, Section 4.6
4	IOAM Direct Export (DEX) Option-Type	Direct exporting	RFC 9326
5-63	Unassigned
64	IOAM Integrity-Protected Pre-allocated Trace Option-Type	Pre-allocated Trace with Integrity Protection	RFC-ietf-ippm-ioam-data-integrity-20, Section 4
65	IOAM Integrity-Protected Incremental Trace Option-Type	Incremental Trace with Integrity Protection	RFC-ietf-ippm-ioam-data-integrity-20, Section 4
66	IOAM Integrity-Protected POT Option-Type	POT with Integrity Protection	RFC-ietf-ippm-ioam-data-integrity-20, Section 4
67	IOAM Integrity-Protected E2E Option-Type	E2E with Integrity Protection	RFC-ietf-ippm-ioam-data-integrity-20, Section 4
68-127	Unassigned

IOAM Trace-Type

Registration Procedure(s)

IETF Review

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)

Available Formats

CSV

Bit	Description	Reference
0	hop_Lim and node_id in short format	RFC 9197
1	ingress_if_id and egress_if_id in short format	RFC 9197
2	timestamp seconds	RFC 9197
3	timestamp fraction	RFC 9197
4	transit delay	RFC 9197
5	namespace-specific data in short format	RFC 9197
6	queue depth	RFC 9197
7	checksum complement	RFC 9197
8	hop_Lim and node_id in wide format	RFC 9197
9	ingress_if_id and egress_if_id in wide format	RFC 9197
10	namespace-specific data in wide format	RFC 9197
11	buffer occupancy	RFC 9197
12-21	Unassigned
22	variable-length Opaque State Snapshot	RFC 9197
23	Reserved	RFC 9197

IOAM Trace-Flags

Registration Procedure(s)

IETF Review

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)
RFC Errata 6992

Available Formats

CSV

Bit	Description	Reference
0	"Overflow" (O-bit)	RFC 9197
1	"Loopback" (L-bit)	RFC 9322
2	"Active" (A-bit)	RFC 9322
3	Unassigned

IOAM POT-Type

Registration Procedure(s)

IETF Review

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)

Available Formats

CSV

Code Point	Name	Description	Reference
0	16-Octet POT data	See RFC 9197, Section 4.5	RFC 9197, Section 4.5
1-255	Unassigned

IOAM POT-Flags

Registration Procedure(s)

IETF Review

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)

Available Formats

CSV

Bit	Description	Reference
0-7	Unassigned

IOAM E2E-Type

Registration Procedure(s)

IETF Review

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)

Available Formats

CSV

Bit	Description	Reference
0	64-bit sequence number	RFC 9197
1	32-bit sequence number	RFC 9197
2	timestamp seconds	RFC 9197
3	timestamp fraction	RFC 9197
4-15	Unassigned

IOAM Namespace-ID

Expert(s)

Unassigned

Reference

RFC 9197: Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)

Available Formats

CSV

Range	Registration Procedures
0x0000	Expert Review
0x0001-0x7FFF	Private Use
0x8000-0xFFFF	Expert Review

Code Point	Name	Description	Status	Reference
0x0000	default namespace (known to all IOAM nodes)	See RFC 9197, Section 4.3	permanent	RFC 9197, Section 4.3
0x0001-0x7FFF	Reserved for Private Use	See RFC 9197, Section 4.3		RFC 9197, Section 4.3
0x8000-0xFFFF	Unassigned

IOAM DEX Flags

Registration Procedure(s)

IETF Review

Reference

RFC 9326: In Situ Operations, Administration, and Maintenance (IOAM) Direct Exporting

Available Formats

CSV

Bit	Description	Reference
0-7	Unassigned

IOAM DEX Extension-Flags

Registration Procedure(s)

IETF Review

Reference

RFC 9326: In Situ Operations, Administration, and Maintenance (IOAM) Direct Exporting

Available Formats

CSV

Bit	Description	Reference
0	Flow ID	RFC 9326
1	Sequence Number	RFC 9326
2	Multicast Branching Node ID	RFC 9630
3	Multicast Branching Interface Index	RFC 9630
4-7	Unassigned

IOAM Integrity Protection Methods

Registration Procedure(s)

IETF Review

Reference

RFC-ietf-ippm-ioam-data-integrity-20: Integrity Protection of In Situ Operations, Administration, and Maintenance (IOAM) Data Fields

Note

When this registry is modified, the YANG module iana-ioam-integrity-protection-methods must be updated as defined in RFC-ietf-ippm-ioam-integrity-yang-08.

Available Formats

CSV

ID	Description	Protected Header Fields	Reference
0x00	AES-GMAC, 16-octet (full) Authentication Tag, 12-octet Initialization Vector.	Pre-allocated Trace and Incremental Trace: - Namespace-ID (mask = 0xffff) - NodeLen + Flags + RemainingLen (mask = 0xfb00) - IOAM Trace-Type (mask = 0xffffff) - Reserved (mask = 0x00) POT: - Namespace-ID (mask = 0xffff) - IOAM-POT-Type (mask = 0xff) - IOAM-POT-Flags (mask = 0x00) E2E: - Namespace-ID (mask = 0xffff) - IOAM-E2E-Type (mask = 0xffff)	RFC-ietf-ippm-ioam-data-integrity-20, Section 5
0x01-0xFE	Unassigned
0xFF	Reserved		RFC-ietf-ippm-ioam-data-integrity-20

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