Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosmarking-01.txt
Behcet Sarikaya <sarikaya2012@gmail.com> Thu, 18 December 2014 17:26 UTC
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Date: Thu, 18 Dec 2014 11:26:27 -0600
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
To: Benson Schliesser <bensons@queuefull.net>
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Cc: "nvo3@ietf.org" <nvo3@ietf.org>, Dino Farinacci <farinacci@gmail.com>, "draft-xia-nvo3-vxlan-qosmarking@tools.ietf.org" <draft-xia-nvo3-vxlan-qosmarking@tools.ietf.org>
Subject: Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosmarking-01.txt
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Hi Benson, On Thu, Nov 13, 2014 at 8:08 PM, Benson Schliesser <bensons@queuefull.net> wrote: > > Hi, Behcet - > > Quoting from my previous message: "one could imagine the NVE imposing an > underlay DSCP in IP2, e.g. to discriminate between tenants." > > No it is not the issue of coping DSCP from IP1 to IP2 especially in tenant based QoS. How can a DC operator apply QoS on each tenant separately when IP1 is created by a VM that does not know the VNI? > This seems so obvious to me that I doubt anybody has bothered to write it > down... > > It does seem like we should document a mechanism for configuration of the > NVE's QoS behavior. (E.g. as part of the NVO3 control plane and/or in a > YANG model for NVE management) But that's a different topic. > > So, back to my question: Is there actually a problem that you trying to > solve that cannot be solved with the existing mechanisms? > > Yes there is. For example, tenant based QoS can only be done at the time the NVE receives VM packet because it is the NVE that adds VNI value. I suggest people to please read Rev. 02 of our draft. In this version we also address QoS framework in VXLAN or the overlay network as you call it. > If so, then I will reconsider my beliefs about WG consensus. But if not, > then I don't see why we're having this conversation. > > I think this should be reconsidered in view of Rev. 02 and the above arguments. Regards, > Thanks, > -Benson > > > Behcet Sarikaya <sarikaya2012@gmail.com> > November 13, 2014 at 4:00 PM > > On Thu, Nov 13, 2014 at 4:47 PM, Benson Schliesser <bensons@queuefull.net> > wrote: > >> Hi, Behcet - >> >> Stepping back from the conversation about bits... What is the problem >> that you're trying to solve, Behcet? >> >> I see multiple existing QoS mechanisms both in the underlay and in the >> overlay, and I don't see any QoS gap that needs to be addressed in the >> overlap encap layer. I believe that my point of view is consistent with the >> WG consensus at this point. >> >> > I am not familiar with any QoS mechanism that is based on the tenant, i.e > static mapping. > Let me know which document discusses it? > > Thx, > > Behcet > >> Thanks, >> -Benson >> >> Dino Farinacci <farinacci@gmail.com> >> November 13, 2014 at 12:02 PM >> >> Sorry there are no EXP bits mentioned in RFC 7348. MPLS is out of scope. >> >> EXP is 3 bits long, DSCP is 6 bits and dividing it into two 3 bit >> pieces, I am not sure if David will like it. >> >> >> I am referring to user-priority bits below: >> >> >> Dino >> >> Benson Schliesser <bensons@queuefull.net> >> November 12, 2014 at 9:34 AM >> Hi, Behcet - >> >> Perhaps I'm confused about what comment (from Dino) that you are >> referring to... But in general, I think of it this way: >> >> Assuming the encap stack looks something like: IP1 / Eth1 / VXLAN / UDP / >> IP2 / Eth2 (progressing L->R as inner->outer) >> >> Then e.g. tenant VMs can mark the IP1 and Eth1 headers with whatever >> appropriate markings they desire. The NVE can mark the IP2 and Eth2 headers >> with whatever appropriate markings. >> >> Specifically, one could imagine the NVE copying the IP1 DSCP codepoint >> into the IP2 header. Alternatively one could imagine the NVE imposing an >> underlay DSCP in IP2, e.g. to discriminate between tenants. Possibly, one >> could also imagine some kind of translation policy which maps IP1 >> codepoints into IP2 codepoints. And that's not even considering mechanisms >> that leverage the Eth headers, use different encap stacks, etc. >> >> Cheers, >> -Benson >> >> Behcet Sarikaya <sarikaya2012@gmail.com> >> November 12, 2014 at 9:01 AM >> Hi Dino, >> >> Regarding your comment on copying IP header QoS bits into VXLAN header, >> >> note that IP packet is coming from the VMs. >> >> Yes for dynamic marking these bits can be copied. >> However, VMs may not be configured to mark these fields. >> >> For static marking these bits can not be used because VMs are not >> aware of the VNI. So NVE has to do the static marking. >> >> Hope this clarifies. >> >> Regards, >> >> Behcet >> >> _______________________________________________ >> nvo3 mailing list >> nvo3@ietf.org >> https://www.ietf.org/mailman/listinfo/nvo3 >> Behcet Sarikaya <sarikaya2012@gmail.com> >> November 10, 2014 at 5:47 PM >> >> On Mon, Nov 10, 2014 at 9:41 PM, Brian E Carpenter<brian.e.carpenter@gmail.com> <brian.e.carpenter@gmail.com> wrote: >> >> [resend with corrected address, sorry] >> >> Hi, >> >> >> The first three bits (bits 5-7) are precedence bits. They are >> assigned according to [RFC0791]. Precedence values '110' and '111' >> are selected for routing traffic. >> >> The last three bits (bits 8-10) are class selector bits. Thet are >> assigned as follows: >> >> 001 - BK or background traffic >> >> ... >> >> As can be seen the markings are the same as in IEEE 802.1p... >> >> This is not in any way compatible with RFC 2474, which also made the >> relevant part of RFC 791 obsolete. >> >> If you want to be compatible with RFC 2474 you should not specify the >> bits at all - just say that they are exactly as defined in RFC 2474 >> and the various PHB definitions that have been published. >> >> I think that diffserv is less relevant in the context of VXLAN. >> >> >> If you >> want to be compatible with IEEE 802.1p that is a different matter, >> >> Yes this is more relevant for VXLAN. >> >> >> but you cannot mix the two up in this way. >> >> I now understand that we confused the two very different things. >> >> Regards, >> >> Behcet >> >> Brian >> >> >> >> >> _______________________________________________ >> nvo3 mailing listnvo3@ietf.orghttps://www.ietf.org/mailman/listinfo/nvo3 >> >> > Benson Schliesser <bensons@queuefull.net> > November 13, 2014 at 12:47 PM > Hi, Behcet - > > Stepping back from the conversation about bits... What is the problem that > you're trying to solve, Behcet? > > I see multiple existing QoS mechanisms both in the underlay and in the > overlay, and I don't see any QoS gap that needs to be addressed in the > overlap encap layer. I believe that my point of view is consistent with the > WG consensus at this point. > > Thanks, > -Benson > > Dino Farinacci <farinacci@gmail.com> > November 12, 2014 at 8:06 PM > > Exactly. Thanks Benson. > > Dino > Benson Schliesser <bensons@queuefull.net> > November 12, 2014 at 9:34 AM > Hi, Behcet - > > Perhaps I'm confused about what comment (from Dino) that you are referring > to... But in general, I think of it this way: > > Assuming the encap stack looks something like: IP1 / Eth1 / VXLAN / UDP / > IP2 / Eth2 (progressing L->R as inner->outer) > > Then e.g. tenant VMs can mark the IP1 and Eth1 headers with whatever > appropriate markings they desire. The NVE can mark the IP2 and Eth2 headers > with whatever appropriate markings. > > Specifically, one could imagine the NVE copying the IP1 DSCP codepoint > into the IP2 header. Alternatively one could imagine the NVE imposing an > underlay DSCP in IP2, e.g. to discriminate between tenants. Possibly, one > could also imagine some kind of translation policy which maps IP1 > codepoints into IP2 codepoints. And that's not even considering mechanisms > that leverage the Eth headers, use different encap stacks, etc. > > Cheers, > -Benson > > Behcet Sarikaya <sarikaya2012@gmail.com> > November 12, 2014 at 9:01 AM > Hi Dino, > > Regarding your comment on copying IP header QoS bits into VXLAN header, > > note that IP packet is coming from the VMs. > > Yes for dynamic marking these bits can be copied. > However, VMs may not be configured to mark these fields. > > For static marking these bits can not be used because VMs are not > aware of the VNI. So NVE has to do the static marking. > > Hope this clarifies. > > Regards, > > Behcet > > _______________________________________________ > nvo3 mailing list > nvo3@ietf.org > https://www.ietf.org/mailman/listinfo/nvo3 > >
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] [tsvwg] I-D Action: draft-xia-nvo3-vxl… Black, David
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Benson Schliesser
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Osama Zia
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Larry Kreeger (kreeger)
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Black, David
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Black, David
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Andrew Qu
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Black, David
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Dino Farinacci
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Dino Farinacci
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Dino Farinacci
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Benson Schliesser
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Osama Bin Zia
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Benson Schliesser
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Erik Nordmark
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Benson Schliesser
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… John E Drake
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Black, David
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Benson Schliesser
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya
- Re: [nvo3] I-D Action: draft-xia-nvo3-vxlan-qosma… Behcet Sarikaya