Re: Naive question on multiple TCP/IP channels and please dont start a uS NN debate here unless you really want to.

[Brian E Carpenter <[e-mail]>]

Hi Richard,
On 07/02/2015 08:51, Richard Shockey wrote:
> 
> On 2/6/15, 2:27 PM, "Brian E Carpenter" <[e-mail]>
> wrote:
> 
>> On 07/02/2015 08:05, Piers O'Hanlon wrote:
>>>
>>> On 6 Feb 2015, at 18:24, Richard Shockey wrote:
>>>
>>>>
>>>> Fine now how do you get the labeling/queueing across the AS boundary?
>>>> I
>>>> don¹t know any ISP that accepts or recognizes the packet labeling of
>>>> another AS.
>>>>
>>> Sure - that's another whole ballgame! A number of ISPs blow away the
>>> DSCP bits in packets from and to the home, as I understand they use
>>> their own set of DSCPs internally.
>>
>> That is entirely in keeping with the diffserv architecture, which is
>> explicit that DSCPs are domain-specific and that traffic may be
>> reclassified at domain boundaries. (Which is what operators wanted
>> when diffserv was designed.)
>>
>>> But agreements of use across boundaries aren't that clear and probably
>>> wouldn't generally be extended to end users.
>>
>> Agreements across boundaries require mutual trust, so it's to be
>> expected that ISPs will reclassify traffic arriving from subscribers.
>> For ISP/ISP boundaries, see
>> http://tools.ietf.org/html/draft-ietf-tsvwg-diffserv-intercon
>>
>>> I guess they're also using things like MPLS, or SDN (e.g. Google B4)
>>> for traffic engineering.
>>
>> Diffserv isn't traffic engineering, however.
> 
> 
> Well Brian after Feb 26 we don¹t know what DIFFSERV will be.  It may be
> illegal unless you can define what a ³specialized service², ³reasonable
> network management² or ³commercially reasonable²  actually is.

I assume you are referring to some particular jurisdiction, which isn't
a standards problem since diffserv is a voluntary standard anyway.
However, since the naive politicians blundering about in this area
usually attempt to forbid "prioritization" and diffserv is not a
priority-based scheme, I doubt that there will be a real problem.

   Brian