Re: [ippm] Comments on draft-cmzrjp-ippm-twamp-yang

Robert Shearman <rshearma@brocade.com> Mon, 27 July 2015 13:51 UTC

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Date: Mon, 27 Jul 2015 14:50:40 +0100
From: Robert Shearman <rshearma@brocade.com>
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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, draft-cmzrjp-ippm-twamp-yang@tools.ietf.org
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Subject: Re: [ippm] Comments on draft-cmzrjp-ippm-twamp-yang
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Hi Al,

On 24/07/15 14:41, MORTON, ALFRED C (AL) wrote:
> Hi Robert,
>
>>> Kostas replied:
>>> | Section 4.1:
>>> |
>>> | What triggers the Control-Client to send the Start-Sessions message?
>>>
>>> In general, it could be triggered programmatically over NETCONF/RESTCONF
>> or using a CLI. We consider this as an operational command, external to
>> the configuration of the system, and out of scope of the data model per se.
>> See also Appendix B.
>>
>> I understand your reasoning, but it would be a shame to not have the
>> mechanism of at least starting TWAMP test sessions standardised, given
>> that it is essential to the ability to use the client at all.
>
> There is a proposal to add time-triggered configuration to
> NETCONF, which would seem to meet your need:
> https://tools.ietf.org/html/draft-mm-netconf-time-capability-05
>
> This draft is currently in IETF-Wide Last Call, so it is worthwhile
> to express you opinion on ietf@ietf.org, if you come up with one:
> https://datatracker.ietf.org/doc/draft-mm-netconf-time-capability/history/

The twamp-session-request:start-time property would appear to do the 
same job, namely setting a lower-bound on the time that a session is 
started?

While it doesn't provide the time at which the configuration was 
actually applied, this isn't actually useful because the configuration 
results in messages sent to the Control-Server and the protocol doesn't 
allow the actual time of execution of the message to be returned. Not 
that I think it would be useful to do anyway.

So I don't think this proposal is required in order for 
draft-cmzrjp-ippm-twamp-yang to specify a mechanism for TWAMP test 
sessions to be started.

Thanks,
Rob