Re: [mpls] Comment on draft-gandhi-mpls-ioam-sr-05

[Loa Andersson <[e-mail]>]

Xiao,

imline please.


On 12/01/2021 09:49, [e-mail] wrote:
> Hi authors,
> 
> While looking through the updated -05 version of this draft, a question 
> emerged in my mind, with the separated Edge-to-Edge IOAM Indicator Label 
> and Hop-by-Hop IOAM Indicator Label,

FWIW my take here is that the Edge-to-Edge IOAM only is processed on the 
edge nodes and that Hop-by-Hop IOAM is processed by all nodes on along 
the LSP, including the edge node.

how can the network operator
> achieve both the Edge-to-Edge IOAM and Hop-by-Hop IOAM simultaneously?

If I understand this correctly that is what is done by Hop-by-Hop IOAM.

> I think there are two ways to achieve that, one way is to define the 
> third IOAM Indicator Label which indicates the existence of both 
> Edge-to-Edge IOAM and Hop-by-Hop IOAM, 

I don't see that as necessary, isn't that what the Hop-by-Hop IOAM 
indicator does.

another way is to merge the
> current two IOAM Indicator Labels and let the IOAM Option-Type to tell 
> the difference between Edge-to-Edge IOAM and Hop-by-Hop IOAM.

Does that mean that even if you are only Edge-to-Edge IOAM  you need to 
inspect the IOAM Option-Type on every node for evey packet?

My 2 c's, but I'm willing to be corrected.

/Loa
> 
> Best Regards,
> Xiao Min
> 
> 原始邮件
> *发件人：*[e-mail]
> *收件人：*[e-mail] ;
> *抄送人：*[e-mail];
> *日 期 ：*2021年01月09日 23:49
> *主 题 ：**[mpls] I-D Action: draft-gandhi-mpls-ioam-sr-05.txt*
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Multiprotocol Label Switching WG of the IETF.
> 
>          Title           : MPLS Data Plane Encapsulation for In-situ OAM Dataloo
>          Authors         : Rakesh Gandhi
>                            Zafar Ali
>                            Clarence Filsfils
>                            Frank Brockners
>                            Bin Wen
>                            Voitek Kozak
>      Filename        : draft-gandhi-mpls-ioam-sr-05.txt
>      Pages           : 14
>      Date            : 2021-01-09
> 
> Abstract:
>     In-situ Operations, Administration, and Maintenance (IOAM) records
>     operational and telemetry information in the data packet while the
>     packet traverses a path between two nodes in the network.  This
>     document defines how IOAM data fields are transported with MPLS data
>     plane encapsulation using new Generic Associated Channel (G-ACh),
>     including Segment Routing (SR) with MPLS data plane (SR-MPLS).
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-gandhi-mpls-ioam-sr/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-gandhi-mpls-ioam-sr-05
> https://datatracker.ietf.org/doc/html/draft-gandhi-mpls-ioam-sr-05
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-gandhi-mpls-ioam-sr-05
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> 
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-- 

Loa Andersson                        email: [e-mail]
Senior MPLS Expert                          [e-mail]
Bronze Dragon Consulting             phone: [phone]