Re: [Detnet] Comments on I-D Action: draft-ietf-detnet-oam-framework-01.txt

Balázs Varga A <balazs.a.varga@ericsson.com> Tue, 22 June 2021 11:12 UTC

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To: Fabrice Theoleyre <theoleyre@unistra.fr>
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Thread-Topic: [Detnet] Comments on I-D Action: draft-ietf-detnet-oam-framework-01.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/7eOMO9k15yFaDPSBdoj8KsakQ2Y>
Subject: Re: [Detnet] Comments on I-D Action: draft-ietf-detnet-oam-framework-01.txt
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Dear Fabrice,
Thanks for the updates, they are fine with me.
Cheers
Bala’zs

From: Fabrice Theoleyre <theoleyre@unistra.fr>
Sent: Wednesday, June 9, 2021 2:53 PM
To: Balázs Varga A <balazs.a.varga@ericsson.com>
Cc: detnet@ietf.org
Subject: Re: [Detnet] Comments on I-D Action: draft-ietf-detnet-oam-framework-01.txt

Dear Balazs,

After the call of Yesterday, please find inline the comments of our last modifications.


TEXT
  6.   DetNet OAM MUST support bi-directional OAM methods.  Such OAM
       methods MAY combine in-band monitoring or measurement in the
       forward direction and out-of-bound notification in the reverse
       direction, i.e., from egress to ingress end point of the OAM
       test session.

Comment28> " egress to ingress end point" Are these the MEPs?

FT>> we have yesterday a quite long discussion on this problem (are MEP only the ingress/egress nodes?). In particular, PREOF may require to have nodes in charge of elimination / replication. Thus, We changed the assertion 1:
TEXT: "It MUST be possible to initiate DetNet OAM session from any  DetNet node towards another DetNet node(s) within given domain."

FT>> Balazs argued yesterday that the source and destination may be DetNet nodes. So, we insert a novel requirement
TEXT "It MAY be possible to initiate a direct DetNet OAM session from a  DetNet source towards a DetNet destination within given domain."

FT>> We also discussed the problem of bidirectional DetNet flows.
FT>> We separated now the requirement for bidirectional vs. unidirectional flows. For unidirectional DetNet flows, the forward direction may be in-band, the inverse direction may be out-of-band.
TEXT: « OAM methods MAY combine in-band monitoring or measurement in the forward direction and out-of-bound notification in the reverse direction, i.e., from egress to ingress end point of the OAM test session.»

FT>> For bidirectional DetNet flows, we MUST support two OAM unidirectional sessions
TEXT: "DetNet OAM MUST support bidirectional DetNet flows, with a pair of OAM sessions, each of them in charge of one of the two directions. »

@all: Please tell us if it is compliant with what you have possibly in mind for uni/bidirectional DetNet flows.


TEXT
  13.  DetNet OAM MUST support unidirectional performance measurement
       methods.  Calculated performance metrics MUST include but are
       not limited to throughput, packet loss, delay and delay
       variation metrics.  [RFC6374] provides detailed information on
       performance measurement and performance metrics.

Comment30> How is this point related to requirement 6.5 (also mentioning PM)?
Comment31> To be discussed whether adding "out-of-order" characteristics as well here.

FT>> good suggestion, inserted in the list.


TEXT
  15.  DetNet OAM MUST support methods to enable survivability of the
       DetNet domain.  These recovery methods MAY use protection
       switching and restoration.

Comment32> " survivability" term not used in DetNet so far. How it is related to DetNet sub-layers? Is it a forwarding sub-layer functionality?

FT>> We replaced it by availability to be compliant with RAW.


TEXT
  16.  DetNet OAM MUST support the discovery of Packet Replication,
       Elimination, and Order preservation sub-functions locations in
       the domain.
  17.  DetNet OAM MUST support testing of Packet Replication,
       Elimination, and Order preservation sub-functions in the domain.

Comment33> "Order" --> "Ordering"
Comment34>  "sub-functions" --> "functions". These are functions not sub-functions.

FT>> Greg seems have already change it.

FT>> We will upload the novel version.

Thank you very much for your constructive feedback.

Cheers,
Fabrice