Re: [Dime] Benoit Claise's No Objection on draft-ietf-dime-drmp-05: (with COMMENT)
Steve Donovan <srdonovan@usdonovans.com> Tue, 10 May 2016 21:16 UTC
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To: Benoit Claise <bclaise@cisco.com>, Ben Campbell <ben@nostrum.com>
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From: Steve Donovan <srdonovan@usdonovans.com>
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Date: Tue, 10 May 2016 16:16:18 -0500
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Cc: draft-ietf-dime-drmp@ietf.org, dime-chairs@ietf.org, dime@ietf.org, The IESG <iesg@ietf.org>
Subject: Re: [Dime] Benoit Claise's No Objection on draft-ietf-dime-drmp-05: (with COMMENT)
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Benoit, Please see my comments inline. Regards, Steve On 5/8/16 7:09 AM, Benoit Claise wrote: > Ben, >> I will jump in on one point, since this is related to the discussion >> on whether nodes need a common approach to selecting/interpreting >> priority values: >> >> On 4 May 2016, at 12:02, Benoit Claise wrote: >> >>> >>> - >>> >>> 1. Request sender - The sender of a request, be it a Diameter Client >>> or a Diameter Server, determines the relative priority of the >>> request and includes that priority information in the request. >>> >>> Question: what is the risk of DMRP ending up as the DSCP, i.e. >>> Every end point changes the value to best service, and in the end, it's >>> useless, and uniquely set by the operator. >> >> I think there's a trusted network assumption here, which would >> include an assumption that trusted clients do not intentionally game >> the system. (in contrast with _accidentally_ gaming the system by >> using a different scheme to set priority values.) >> >> However, I think that this sort of assumption should be explicitly >> mentioned. > I believe so. >> IIRC, DOIC included some guidance about crossing trust boundaries; >> perhaps DRMP should do the same. > Yes. > That makes me think. I wonder how the following two statements are > interoperable? > > Diameter nodes MUST have a default priority to apply to transactions > that do not have an explicit priority set in the DRMP AVP. > > Diameter nodes SHOULD use the PRIORITY_10 priority as this default > value. > > > Shouldn't the last SHOULD be a MUST? SRD> The reason it is a SHOULD is to allow for an operator to define a priority scheme with a different value, much as you outline below. > > Let me explain: a Diameter node wants to send Diameter messages with > priority above average, so PRIORITY = 12 (because his default is 10). > Along the path (potentially crossing a boundary), a Diameter node > doesn't support the DRMP AVP. The next node, which does, sets his > default priority. The default priority on that node has been > configured as 13. And now, my Diameter messages will be treated as > below average. > Do I miss anything? SRD> Yes, as described, this would be an issue. This is one of the reasons that the DISCUSS threads have focused on the need to emphasize that this mechanism only works if a consistent priority scheme is applied to all messages and that it only works within a trusted environment. This implies that priority values received from other Diameter networks likely can't be trusted. SRD> It may be necessary to add a requirement that the priority value MUST be the same for all nodes within the Diameter network using a defined priority scheme. > > Regards, Benoit > >> >> (And I guess that does make it a bit like DSCP ;-) ) >> >> Ben. >> . >> >
- [Dime] Benoit Claise's No Objection on draft-ietf… Benoit Claise
- Re: [Dime] Benoit Claise's No Objection on draft-… Ben Campbell
- Re: [Dime] Benoit Claise's No Objection on draft-… Steve Donovan
- Re: [Dime] Benoit Claise's No Objection on draft-… Benoit Claise
- Re: [Dime] Benoit Claise's No Objection on draft-… Steve Donovan
- Re: [Dime] Benoit Claise's No Objection on draft-… Benoit Claise