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RE: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]

"Manfredi, Albert E" <albert.e.manfredi@boeing.com> Fri, 20 October 2017 19:00 UTC

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From: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
To: Lin Han <Lin.Han@huawei.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: 6man WG <ipv6@ietf.org>
Subject: RE: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]
Thread-Topic: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]
Thread-Index: AQHTSdJXWQhFM45R6Eu7awJMeidiK6LtFbvw
Date: Fri, 20 Oct 2017 19:00:13 +0000
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-----Original Message-----
From: Lin Han [mailto:Lin.Han@huawei.com] 

> ATM is failed due to many reasons, scalability is one of it.
> This solution is not intended to replace completely the best-effort transport
> service. The solution is only for those application which really needs a flow
> level QoS, such as AR/VR, tactile internet, etc. From this sense, it does not
> sacrifice the scalability of IP.

Or at least, does not sacrifice it as much? ATM also had a UBR service.

But my point was only that out in the wild, you have no guarantee that the routers in the path will know what to do with your in-band QoS demands. Only in situations where all the routers are in your control will you have that guarantee. But sure, in walled gardens, these cool ideas can be made to work.

On the other hand, also in these controlled environments, another option, frequently, is to "throw bandwidth at the problem." Give yourself plenty of headroom. It's less elegant and less fun, but it works great.

Bert

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