Re: [bmwg] Comment on meth-18.

Kris,

Test equipment does not drop or discard since they do not route or
switch.  The test equipment is the last hop of the path for a packet
flow.  The test equipment receives the packets and increments counters.

Scott

-----Original Message-----
From: bmwg-bounces@ietf.org [mailto:bmwg-bounces@ietf.org] On Behalf Of
Kris Michielsen
Sent: Friday, July 17, 2009 11:46 AM
To: 'McLendon, John'; 'Al Morton'; bmwg@ietf.org
Subject: Re: [bmwg] Comment on meth-18.

John,

Thanks for reviewing the draft!

What do you think of the following suggestion?
OLD:
For Convergence Events caused by the Tester, such as an IGP cost change,
the Tester may start to drop all traffic received from the
Preferred Egress Interface at the Convergence Event Instant to achieve
the same result.

NEW:
For Convergence Events caused by the Tester, such as an IGP cost change,
the Tester may start to discard all traffic received from
the Preferred Egress Interface at the Convergence Event Instant, or may
be able to separately observe packets received from the
Preferred Egress Interface prior to the Convergence Event Instant, to
achieve the same result.

Thanks,
Kris

> -----Original Message-----
> From: bmwg-bounces@ietf.org [mailto:bmwg-bounces@ietf.org] On 
> Behalf Of McLendon, John
> Sent: 16 July 2009 00:00
> To: Al Morton; bmwg@ietf.org
> Subject: [bmwg] Comment on meth-18.
> 
> Hi all,
> I have a comment on the following statement in Sec 4, top of pp. 9, in
> meth-18:
> 
> "For Convergence Events caused by the Tester, such as an IGP 
> cost change, the Tester may start to drop all traffic 
> received from the Preferred Egress Interface at the 
> Convergence Event Instant to achieve the same result."
> 
> The word "drop" implies that the test device forwards or 
> drops traffic.
> In my experience, test devices neither forward or drop 
> traffic. They may generate or analyze traffic, but a test 
> device dropping traffic doesn't seem helpful to the desired 
> measurement. Many test devices can bring a link down at the 
> physical layer.
> 
> J...
> 
> 
> 
> -----Original Message-----
> From: bmwg-bounces@ietf.org [mailto:bmwg-bounces@ietf.org] On 
> Behalf Of Al Morton
> Sent: Wednesday, July 15, 2009 3:48 PM
> To: bmwg@ietf.org
> Subject: Re: [bmwg] WGLC: draft-ietf-bmwg-igp-dataplane drafts
> 
> Comments on meth-18, all nits,
> Al (mostly as participant)
> 
> At 01:44 PM 7/14/2009, Al Morton wrote:
> >...This message begins a Last call on the IGP-Dataplane Convergence 
> >Time Benchmarking drafts.
> >
> >http://tools.ietf.org/html/draft-ietf-bmwg-igp-dataplane-conv-term-18
> >http://tools.ietf.org/html/draft-ietf-bmwg-igp-dataplane-conv-meth-18
> >http://tools.ietf.org/html/draft-ietf-bmwg-igp-dataplane-conv-app-17
> >
> >The Last Call will end on July 31, 2009.
> 
> 
> Section 4, top of page 10,
> s/At least one condition need to /At least one condition needs to /
> 
> 
> 5.7.  Measurement Accuracy
> ...  When packet jitter is much less than the convergence
>     time, it is a negligible source of error and therefor it 
> will be s/therefor/therefore/
> 
> 5.9 Tester Capabilities
> Add "Also see section 6 for method-specific capabilities."
> 
> 6.1.3.  Measurement Accuracy
> 
>     TBD
> (can't leave this TBD, if there's no obvious material, delete 
> section ?)
> 
> 
> Section 7, Reporting Format
> 
>          Maximum Packet Delay Threshold      seconds
> this is called "Forwarding Delay Threshold" in the term doc, right?
> pick one for both...
> 
> Section 9, same as terms, use the standard BMWG paragraphs...
> 
> 
>     
> 
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