Re: [Teas] [netmod] Typedefs for bandwidth
Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Fri, 14 May 2021 10:48 UTC
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Date: Fri, 14 May 2021 12:48:20 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Italo Busi <Italo.Busi@huawei.com>
Cc: Reshad Rahman <reshad=40yahoo.com@dmarc.ietf.org>, "'netmod@ietf.org'" <netmod@ietf.org>, "teas@ietf.org" <teas@ietf.org>
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Mail-Followup-To: Italo Busi <Italo.Busi@huawei.com>, Reshad Rahman <reshad=40yahoo.com@dmarc.ietf.org>, "'netmod@ietf.org'" <netmod@ietf.org>, "teas@ietf.org" <teas@ietf.org>
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Subject: Re: [Teas] [netmod] Typedefs for bandwidth
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I assume it is best to settle this in teas. Form a programmatic point of view, you likely want to have a single unit. Even if you go for bps (bits per second), a uint64 still allows you to express quite big data rates (I think 16777216 terra bits per second but please check yourself). From a human point of view, having a notation that supports different units may be desirable. But if you have multiple representations, this surely increases implementation cost and it gets you into answer questions whether there should be a canonical format or a way to decide which unit is selected. Writing constraints in when or must statements will also become much more fun. Whether you really need the range of a floating point number, I can't tell. Perhaps check what the realistic smallest and biggest bandwidth is that you need to represent. Generally, floating point numbers seem to be a no-brainer for management application writers but I have been told that they are less frequently found in line cards or OS kernels. /js On Fri, May 14, 2021 at 10:08:00AM +0000, Italo Busi wrote: > Reshad, Juergen, > > Actually, there is some on-going discussion within TEAS because some packet technology-specific YANG modules are not using the bandwidth-ieee-float32 but prefers using some uint type: > > https://github.com/tsaad-dev/te/issues/116 > > The ietf-te-packet-types already defines bandwidth-kbps, bandwidth-mbps and bandwidth-gbps but during the discussion of this open issue it was pointed out that it would be desirable to specify both the bandwidth and the units (Kbps/Mbps/Gbps) > > Italo > > > -----Original Message----- > > From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-university.de] > > Sent: giovedì 13 maggio 2021 19:25 > > To: Reshad Rahman <reshad=40yahoo.com@dmarc.ietf.org> > > Cc: 'netmod@ietf.org' <netmod@ietf.org> > > Subject: Re: [netmod] Typedefs for bandwidth > > > > On Thu, May 13, 2021 at 11:57:26AM -0400, Reshad Rahman wrote: > > > Hi, > > > > > > > > > > > > Has there been any discussions wrt adding new bandwidth types e.g. the > > bandwidth-xxx types in draft-ietf-teas-yang-te-types? I see RFC8294 has > > bandwidth-ieee-float32 but it doesn’t have units (Kbps/Mbps/Gbps). > > > > > > > The description of bandwidth-ieee-float32 says: > > > > The units are octets per second. > > > > Note that draft-ietf-teas-yang-te-types has been published as RFC 8776 in June > > 2020, it should be safe to use these definitions. > > > > /js > > > > -- > > Juergen Schoenwaelder Jacobs University Bremen gGmbH > > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > > Fax: +49 421 200 3103 <https://www.jacobs-university.de/> > > > -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 <https://www.jacobs-university.de/>
- Re: [Teas] [netmod] Typedefs for bandwidth Italo Busi
- Re: [Teas] [netmod] Typedefs for bandwidth Juergen Schoenwaelder
- Re: [Teas] [netmod] Typedefs for bandwidth Acee Lindem (acee)
- Re: [Teas] [netmod] Typedefs for bandwidth Don Fedyk