Re: [Detnet] OAM terms

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Wed, 07 July 2021 13:34 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "gregory.mirsky@ztetx.com" <gregory.mirsky@ztetx.com>
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Thread-Topic: Re:[Detnet] OAM terms
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Subject: Re: [Detnet] OAM terms
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Hello Greg:

Many thanks!

I committed https://raw.githubusercontent.com/raw-wg/raw-architecture/main/raw-architecture.txt?token=ABYHN4L5D5UAWDLRS6YK2XTA4WWSE for the discussion below, if you can please recheck that we are aligned so I can publish; more below:

> AOM:
> GIM>> This seems as a typo. s/AOM/OAM?

Yes typo sorry

> OAM stands for Operations, Administration, and Maintenance, and covers the
> processes, activities, tools, and standards involved with operating,
> administering, managing and maintaining any system.  This document uses
> the terms Operations, Administration, and Maintenance, in conformance with
> the IETF 'Guidelines for the Use of the "OAM" Acronym in the IETF'
> [RFC6291] and the system observed by the RAW OAM is the Track.
> Active OAM:  Active OAM uses specially constructed test packets crafted to
> observe a particular Track, subTrack, or Segment of a Track.

> GIM>> Perhaps adding a reference to RFC 7799 Active and Passive Metrics
> and Methods (with Hybrid Types in-Between)? RFC 7799 provides clear
> definitions for Active, Passive, and Hybrid OAM methods, particularly when
> classifying Performance Monitoring OAM protocols.

Added in supplemental text

> In-Band OAM:  An active OAM packet is considered in-band in the monitored
> Track when it traverses the same set of links and interfaces receiving the
> same QoS and PAREO treatment as the data flows that are injected in the
> Track.
> Out-of-Band OAM:  An active OAM packet is out-of-band if its datapath is
> topologically the same as of that of the Track, subTrack or Segment being
> observed, but the QoS or PAREO treatment is different (e.g., lower CoS).


> GIM>> I agree that that is a good example of out-of-band active OAM. Also,
> an out-of-band OAM may be using a diverse path, e.g., management network.
> Below is the text from the updated version of draft-ietf-detnet-oam-
> framework:
>    Out-of-band OAM is an active OAM whose path through the DetNet domain
> is not topologically identical to the
>    path of the monitored DetNet flow, or its test packets receive
> different QoS and/or PREOF treatment, or both.

I adapted that new text to RAW 

> 
> Limited OAM:  An active OAM packet is a Limited OAM packet when it is
> observes the RAW operation over a node, a segment, or a subTrack of the
> Track, though not from Ingress to Egress.  It is injected in the datapath
> and extracted from the datapath around the particular function or
> subnetwork (e.g., around a relay providing a service layer replication
> point) that is being tested.

> GIM>> Can a node, a subTrack, and a segment be considered as examples of
> the same construct? In the course of describing OAM in MPLS-TP, a Sub-Path
> Maintenance Element was introduced in Section 3.13 of RFC 5921
> (https://datatracker.ietf.org/doc/html/rfc5921#section-3.13). An SPME is
> needed in the MPLS data plane because an active OAM packet cannot be
> injected into an LSP by an LSR (only LER can inject a test packet). An
> SPME is a hierarchical LSP that tunnels a section of the transport LSP and
> creates MEPs at the section's end-points. Can we re-use any of MPLS-TP OAM
> terminology (even though no one likes to be reminded of MPLS-TP)?

A Track is a networking graph where the edges are Segments and the vertices are (service layer) detnet relays, where a Segment is a sequence of Links connected by (forwarding layer) detnet transit nodes.
I believe these are all different concepts. 

That terminology seems useful beyond RAW though, because the term path is really anything and everything, see the definition of path in RFC 9049 vs. the detnet expectations. As you know there's hardly anything better than an approximate terminology to be completely misunderstood.

On the bright side, the logic of defining a sub-Track is consistent with that of defining a sub-path.

> 
> Reverse OAM:  A Reverse OAM packet is an Out-of-Band OAM packet that
> traverses the Track from West to East and North-South in one of either
> direction, to capture and report OAM measurements upstream.
> GIM>> As this is one method of collecting telemetry information, could
> GIM>> it be described without giving it a distinct name?

The term is used in the main text. It appears useful. But are you saying that it is misleading?

Many thanks!

Pascal