Dear All,
please kindly consider following comments as part of the IETF Last Call:
* Abstract.
Key test protocol aspects require the ability to control packet size on the
tested path and enable asymmetrical packet size testing in a
controller-responder architecture.
I believe that in IPPM WG meeting in Toronto the WG agreed that support of
asymmetrical test packet rate is required and support of asymmetrical packet
size is recommended. Thus I propose following text update:
Key test protocol aspects require the ability to control test packet
characteristics on the tested path and enable asymmetrical test flow rates in
controller-responder architecture.
* Section 5. Test Protocol Control & Generation Requirements
As the IPPM WG agreed that asymmetric test packet flow may be created by
variation of not just packet size but intra-pair spacing and/or inter-pair
interval, requirement #4 is not generic but presents only one possible
solution. I propose change requirement #4 to change from "asymmetric packet
size" to "asymmetric packet flows in a two-way measurement architecture".
The next to the last paragraph suggests:
Implementations may support control and generation for only symmetric packet
sizes when none of the above conditions hold.
I believe that this requirement (if it is a requirement, then s/may/MAY/ seems
in order here) contradicts earlier explanation that mentions variation of
intra-pair spacing and inter-pair interval as possible method to generate
asymmetric flow of test packets. Thus a protocol that can control spacing
and/or intervals would be suitable to any combination of 1, 3, 4 and 6.
Proposed text:
Implementations MAY support control and generation of variable inter-pair
intervals in each direction with symmetric packet sizes to support performance
measurements of asymmetric data flows in two-way architecture.
Regards,
Greg