From bob.briscoe@bt.com Mon Aug 1 10:42:30 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3124511E8114 for ; Mon, 1 Aug 2011 10:42:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.467 X-Spam-Level: X-Spam-Status: No, score=-3.467 tagged_above=-999 required=5 tests=[AWL=0.132, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dUMNX-oS0rI0 for ; Mon, 1 Aug 2011 10:42:29 -0700 (PDT) Received: from smtp2.smtp.bt.com (smtp2.smtp.bt.com [217.32.164.150]) by ietfa.amsl.com (Postfix) with ESMTP id 6F9DB11E810D for ; Mon, 1 Aug 2011 10:42:29 -0700 (PDT) Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 1 Aug 2011 18:42:33 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Mon, 1 Aug 2011 18:42:33 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1312220551390; Mon, 1 Aug 2011 18:42:31 +0100 Received: from MUT.jungle.bt.co.uk ([10.215.130.253]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p71HgRZH018254; Mon, 1 Aug 2011 18:42:27 +0100 Message-Id: <201108011742.p71HgRZH018254@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Mon, 01 Aug 2011 18:42:32 +0100 To: BRADNER Scott From: Bob Briscoe Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 01 Aug 2011 17:42:33.0193 (UTC) FILETIME=[64A4FD90:01CC5072] Cc: Michael Menth , PCN IETF list Subject: [PCN] Fwd: New Version Notification for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Aug 2011 17:42:30 -0000 Scott, We've posted draft-ietf-pcn-3-in-1-encoding-07 so it's now ready for WGLC when you are. Cheers Bob >From: >To: >CC: , , > >Subject: New Version Notification for draft-ietf-pcn-3-in-1-encoding-07.txt > >A new version of I-D, draft-ietf-pcn-3-in-1-encoding-07.txt has been >successfully submitted by Toby Moncaster and posted to the IETF repository. > >Filename: draft-ietf-pcn-3-in-1-encoding >Revision: 07 >Title: Encoding 3 PCN-States in the IP header using a single DSCP >Creation date: 2011-07-30 >WG ID: pcn >Number of pages: 23 > >Abstract: > The objective of Pre-Congestion Notification (PCN) is to protect the > quality of service (QoS) of inelastic flows within a Diffserv domain. > The overall rate of the PCN-traffic is metered on every link in the > PCN domain, and PCN-packets are appropriately marked when certain > configured rates are exceeded. Egress nodes pass information about > these PCN-marks to decision points which then decide whether to admit > or block new flow requests or to terminate some already-admitted > flows during serious pre-congestion. > > This document specifies how PCN-marks are to be encoded into the IP > header by re-using the Explicit Congestion Notification (ECN) > codepoints within a PCN-domain. This encoding provides for up to > three different PCN marking states using a single DSCP: not-marked > (NM), threshold-marked (ThM) and excess-traffic-marked (ETM). Hence, > it is called the 3-in-1 PCN encoding. This document obsoletes > RFC5696. > > > > > >The IETF Secretariat ________________________________________________________________ Bob Briscoe, BT Innovate & Design From philip.eardley@bt.com Fri Aug 5 02:03:04 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 05EA821F8AD8 for ; Fri, 5 Aug 2011 02:03:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.473 X-Spam-Level: X-Spam-Status: No, score=-101.473 tagged_above=-999 required=5 tests=[AWL=-1.328, BAYES_00=-2.599, HELO_MISMATCH_COM=0.553, HTML_MESSAGE=0.001, J_CHICKENPOX_21=0.6, MANGLED_TOOL=2.3, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YuQv-I4BXkUS for ; Fri, 5 Aug 2011 02:02:59 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp62.intersmtp.COM [62.239.224.235]) by ietfa.amsl.com (Postfix) with ESMTP id 37D1021F8AE6 for ; Fri, 5 Aug 2011 02:02:58 -0700 (PDT) Received: from EVMHT61-UKRD.domain1.systemhost.net (10.36.3.127) by RDW083A006ED62.smtp-e2.hygiene.service (10.187.98.11) with Microsoft SMTP Server (TLS) id 8.3.159.2; Fri, 5 Aug 2011 10:03:14 +0100 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.1.71]) by EVMHT61-UKRD.domain1.systemhost.net ([10.36.3.127]) with mapi; Fri, 5 Aug 2011 10:03:13 +0100 From: To: , Date: Fri, 5 Aug 2011 10:03:12 +0100 Thread-Topic: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt Thread-Index: AcxP5dZpCz2JJRSHTkKlHEZ2q5oM/ADYAmmw Message-ID: <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.domain1.systemhost.net> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_" MIME-Version: 1.0 Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Aug 2011 09:03:04 -0000 --_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Here are some small comments - the doc looks very good and is ready for IES= G i think S1 << The baseline encoding defined in [RFC5696] described how two PCN>> Delete 'baseline' - just confusing for people in the future << This document extends the baseline encoding by redefining the EXP>> This document amends the [RFC5696] encoding by redefining the 01 (and a couple of lines earlier where you mention EXP, add that this is 01 c= odepoint) S2.1 << Threshold-marked codepoint: a codepoint that indicates packets that have been marked at a PCN-interior-node as a result of an indication from the threshold-metering function [RFC5670]. Abbreviated to ThM.>> I wonder if this would be clearer as Threshold-marked codepoint: a codepoint that indicates a packet has bee= n threshold-marked, that is a packet that has been marked at a PCN-interior-node as a result of an indication from the threshold-metering function [RFC5670]. Abbreviated to ThM. [firstly clearer to refer to 'packet' than 'packets', secondly uses the ter= m 'threshold-marked' which was defined in 5559] Similarly for excess-traffic-marked codepoint << Not-marked codepoint: a codepoint that indicates PCN-packets but that are not PCN-marked. Abbreviated to NM.>> delete 'but' S3 << A PCN-node (i.e. a node within a PCN-domain) will be configured to recognise certain DSCPs as PCN-compatible. Appendix A discusses the choice of suitable DSCPs. In Figure 1 'DSCP n' indicates such a PCN- compatible DSCP. Within the PCN-domain, any packet carrying a PCN- compatible DSCP is a PCN-packet as defined in [RFC5559].>> A PCN-node (i.e. a node within a PCN-domain) will be configured to recognise certain DSCP(s) as PCN-compatible. Appendix A discusses the choice of suitable DSCP(s). In Figure 1 'DSCP n' indicates such a PCN- compatible DSCP. Within the PCN-domain, any packet carrying a PCN- compatible DSCP and with the ECN-field anything other than 00 (Not-PCN) = is a PCN-packet as defined in [RFC5559]= . [DSCPs =3D> DSCP(s). And added phrase in last sentence] 4.2 Delete "the baseline encoding " With =3D> that has [a Not-marked codepoint...] 4.3 << For the full 3-in-1 encoding to apply, any tunnel endpoints (IP-in-IP and IPsec) within the PCN-domain MUST comply with the ECN encapsulation and decapsulation rules set out in [RFC6040] (see Section 4.2). There is one exception to this rule outlined next. >> With one exception (see next paragraph), any tunnel endpoints (IP-in-IP and IPsec) within the PCN-domain MUST comply with the ECN encapsulation and decapsulation rules set out in [RFC6040] (see Section 4.2). S5 << As mentioned in Section 4.3 above, all PCN-nodes MUST comply with [RFC6040].>> All PCN-nodes MUST comply with [RFC6040= ]. Since PCN is a new capability, this is considered a reasonable requireme= nt. [note that it isn't mentioned in Section 4.3 !] S5.2.3 << Observant readers may spot an apparent inconsistency between the two following cases. Appendix D explains the rationale behind this inconsistency. >> Appendix D explains the rationale for the behaviours defined in this section. [i see no reason to worry the average reader with talk of inconsistency.] S5.3 << marking is used it should treat ETM as ThM. However it SHOULD raise>> marking is used it SHOULD treat ETM as ThM. However it SHOULD raise s6.1 << PCN-ingress- nodes ensure that any packets entering the PCN-domain have the ECN field in their outermost IP header set to the appropriate PCN codepoint. >> CHANGE TO "appropriate codepoint" (as it may be appropriate to set it to 00= , which isn't a PCN codepoint) 6.2 Thre =3D> there 10 Criticism is misspelt Appendix A The para "PCN-marking is intended... It wasn't clear to me whether PCN is operating on the whole aggregate of cl= asses together, or on each class separately. Or whether either is possible. App B << a. flow signalling associates a. flow signalling, which associates << Interactive Real-Time, Broadcast TV >> These have slightly different names in App A << Figure 2: Separation of tunneling and PCN actions =3D> tunnelling a) Does not require admission control: b) Requires Admission-control: i think it would be helpful to add "The e2e ECN traffic is not treated as P= CN-traffic" and "The e2e ECN traffic is treated as PCN-traffic" << * The PCN-ingress places this traffic in a tunnel with a PCN- compatible DSCP in the outer header. The PCN-egress zeroes the ECN-field before decapsulation. * The PCN-ingress drops CE-marked packets and the PCN-egress zeros the ECN field of all PCN packets. >> This can't be quite right, something like * The PCN-ingress places this traffic in a tunnel with, in the outer = header, a PCN- compatible DSCP and the ECN-field set to Not-PCN. The PCN-egress = zeroes the (outer) ECN-field before decapsulation. * The PCN-ingress drops CE-marked packets and otherwise sets the ECN= -field to NM, and sets the DCSP to a PCN- compatible DSCP [or requi= res that it's already in such a DSCP??]. The PCN-egress zeroes the ECN fiel= d of all PCN packets; note this turns off e2e ECN. [note, 'zeroes'] [i'm not sure about the last bullet, is this what you mean>?] You could also correct PCN-ingress to PCN-ingress-node throughout the secti= on; ditto PCN-egress. <].>> Well a PCN-interior-node doesn't know about ECT. Change to: Note that a PCN-interior-node may change the ECN-field from 10 to 01 (NM to= ThM), which would be interpreted by the e2e ECN as a change from ECT(0) in= to ECT(1) -- hence it would not be compatible with the (currently experimen= tal) ECN nonce [RFC3540]. App C <] was written while PCN specifications were in early draft stages>> The 'But' makes it sound like you're updating 5129 (i don't think you are, = if i remember right) ECT(0) -> NM Etc (all 6 bullets need to be changed) After the last bullet you could add "The above sets of codepoints are required for every PCN-compatible DSCP." App D In title & , Discrepancy -> Difference Apparent discrepancy -> slight difference (to me, discrepancy implies something is wrong) <> The behaviour with only threshold marking keeps to the rule of Section 5.2.= 1 that ETM is more severe and must never be changed to ThM (even though ETM is not a valid marking in this case). First bullet Your argument also means that a ThM should be corrected to ETM (since the e= xcess-traffic-metering behaviour depends on ETM marks on arriving packets).= At the moment it only gets corrected when the meter wants to ETM mark the = pkt. But making this correction would require different code compared with the s= tandard behaviour. Personally i'd just delete the first bullet. If not, make it the second one= (as it's harder to understand) Best wishes phil Philip Eardley Research and Technology Strategy This email contains BT information, which may be privileged or confidential= . It's meant only for the individual(s) or entity named above. If you're no= t the intended recipient, note that disclosing, copying, distributing or us= ing this information is prohibited. If you've received this email in error,= please let me know immediately on the email address above. Thank you. We m= onitor our email system, and may record your emails. British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no: 1800000 From: pcn-bounces@ietf.org [mailto:pcn-bounces@ietf.org] On Behalf Of Scott= O Bradner Sent: 31 July 2011 18:38 To: Toby Moncaster Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt sigh - tooooo long a IETF meeting :-) Scott On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: I'm guessing you mean comments by August 15? (otherwise this will be a ~350 day LC!) Toby -----Original Message----- From: pcn-bounces@ietf.org [mailto:pcn-bounces= @ietf.org] On Behalf Of Scott O. Bradner Sent: 30 July 2011 20:40 To: pcn@ietf.org Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt comments by July 15 please Scott _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn Scott Bradner Harvard University Information Technology Security | Policy, Risk & Compliance +1 617 495 3864 29 Oxford St., Room 407 Cambridge, MA 02138 www.harvard.edu/huit --_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Here are some small comments – the doc l= ooks very good and is ready for IESG i think

 

S1

<<   The bas=
eline encoding defined in [RFC5696] described how two PCN>>
Del=
ete ‘baseline’ – just confusing for people in the future<=
o:p>
 
<<   This =
document extends the baseline encoding by redefining the EXP>>
   This document amends the [RFC5696] encoding by =
redefining the 01
 
(and a c=
ouple of lines earlier where you mention EXP, add that this is 01 codepoint=
)
 

S= 2.1

<<   Threshold-=
marked codepoint:  a codepoint that indicates packets that<=
/pre>
      have been marked at a PCN-interior=
-node as a result of an
     =
 indication from the threshold-metering function [RFC5670].
    &n=
bsp; Abbreviated to ThM.>>
I wonder if this woul=
d be clearer as
   Threshold-marked codepoin=
t:  a codepoint that indicates a packet has been threshold-marked, tha=
t is a packet that
      has =
been marked at a PCN-interior-node as a result of an
&=
nbsp;     indication from the threshold-metering functi=
on [RFC5670].
      Abbreviated to ThM.
=
[firstly clearer to refer to ‘packet’ than ‘packets’=
;, secondly uses the term ‘threshold-marked’ which was defined =
in 5559]
Similarly for excess-traffic-marked codepoint=

 
<<   Not-=
marked codepoint:  a codepoint that indicates PCN-packets but
      that are not PCN-marked.  =
Abbreviated to NM.>>
delete ‘but’
 
S3
<=
< A PCN-node (i.e. a node within a PCN-domain) will be configured to
   recognise certain DSCPs as PCN-compatible.&n=
bsp; Appendix A discusses the
  =
; choice of suitable DSCPs.  In Figure 1 'DSCP n' indicates such a PCN=
-
   compatible DSCP.  Within the PCN-d=
omain, any packet carrying a PCN-
   compati=
ble DSCP is a PCN-packet as defined in [RFC5559].>>
A PCN-node (i.e. a node wi=
thin a PCN-domain) will be configured to
   =
recognise certain DSCP(s) as PCN-compatible.  Appendix A =
discusses the
   choice of suitable DSCP(s).=
  In Figure 1 'DSCP n' indicates such a PCN-
&nbs=
p;  compatible DSCP.  Within the PCN-domain, any packet carrying =
a PCN-
   compatible DSCP and with the ECN-f=
ield anything other than 00 (Not-PCN) is a PCN-packet as defined in [RFC5559].
[DSCP=
s =3D> DSCP(s). And added phrase in last sentence]

 

4.2

Delete “the baseline =
encoding “
 
With =3D&=
gt; that has [a Not-marked codepoint...]
 
4.3
<< For the full 3-in-1 encodi=
ng to apply, any tunnel endpoints (IP-in-IP
 &nbs=
p; and IPsec) within the PCN-domain MUST comply with the ECN
   encapsulation and decapsulation rules set out in [RFC6040] (see
=
   Section 4.2).  There is one exception to th=
is rule outlined next.
>> 
=

With one exception (see next paragraph), any tunnel endpoints (IP-in-I=
P
   and IPsec) within the PCN-domain MUST c=
omply with the ECN
   encapsulation and deca=
psulation rules set out in [RFC604=
0] (see
   Section 4.2).&n=
bsp; 
 
S5
<=
pre><< As mentioned in Section 4.3 above, all PCN-nodes=
 MUST comply with
   [RFC6040].>>
All PCN-nodes=
 MUST comply with [RFC6040]. S=
ince PCN is a new capability, this is considered a reasonable requirement.<=
o:p>
 
[note that it isn’t =
mentioned in Section 4.3 !]
 <=
/o:p>
S5.2.3
<< Observant readers may =
spot an apparent inconsistency
   between th=
e two following cases.  Appendix D explains the rationale=

   behind this inconsistency.
>> 
Appendix D explain=
s the rationale for the behaviours defined in this section.
[i see no reason to worry the average reader with talk of inconsisten=
cy.]
 
S5.3
=

<<   marking is used it should treat ETM as ThM. =
 However it SHOULD raise>>
   marking =
is used it SHOULD treat ETM as ThM.  However it SHOULD raise
 
s6.1
<< =
PCN-ingress-
   nodes ensure that any packet=
s entering the PCN-domain have the ECN
   fi=
eld in their outermost IP header set to the appropriate PCN
   codepoint.  >>     &=
nbsp;            &nb=
sp;             =
;     
CHANGE TO “appropriat=
e codepoint” (as it may be appropriate to set it to 00, which isnR=
17;t a PCN codepoint)
 
6.2<=
o:p>
Thre =3D> there
 
10
Criticism is misspelt 
 
Appendix A
The para=
 “PCN-marking is intended...
It wasn’t cle=
ar to me whether PCN is operating on the whole aggregate of classes togethe=
r, or on each class separately. Or whether either is possible.
 
App B
<< a.=
  flow signalling associates
a.  flow signal=
ling, which associates
 
<=
;< Interactive Real-Time,
    &=
nbsp;  Broadcast TV >>
These have slightly =
different names in App A
 
&=
lt;< Figure 2: Separation of tunneling and PCN actions
<=
pre>=3D> tunnelling
 
&nb=
sp;  a) Does not require admission control:
 =
;  b) Requires Admission-control:  
i think =
it would be helpful to add “The e2e ECN traffic is not treated as PCN=
-traffic” and “The e2e ECN traffic is treated as PCN-traffic=
221;
 
<< 
     *  The PCN-ingress places this=
 traffic in a tunnel with a PCN-
   &nb=
sp;     compatible DSCP in the outer header.  The =
PCN-egress zeroes the
     &n=
bsp;   ECN-field before decapsulation.
=
 
      *  The PCN-ingre=
ss drops CE-marked packets and the PCN-egress
 &n=
bsp;       zeros the ECN field of all PCN pac=
kets.
>> 
This canR=
17;t be quite right, something like
   =
  *  The PCN-ingress places this traffic in a tunnel with, in the=
 outer header, a PCN-
     &n=
bsp;   compatible DSCP and the ECN-field set to Not-PCN.  Th=
e PCN-egress zeroes the
     =
    (outer) ECN-field before decapsulation.
=

             &n=
bsp;             &nb=
sp;        
  =
    *  The PCN-ingress drops CE-marked packets and othe=
rwise sets the ECN-field to NM, and sets the DCSP to a PCN-  &nbs=
p;      compatible DSCP [or requires that it’=
;s already in such a DSCP??]. The PCN-egress zeroes the ECN field of all PC=
N packets; note this turns off e2e ECN.
 
[note, ‘zeroes’]
[i’m =
not sure about the last bullet, is this what you mean>?]
 
You could also correct PCN-ingress to PCN=
-ingress-node throughout the section; ditto PCN-egress.
 
<<Note that a PCN interior node may tur=
n
      ECT(0) into ECT(1), w=
hich would not be compatible with the
  &nbs=
p;   (currently experimental) ECN nonce [RFC3540].>>
Well a PCN-interior-node doesn’t know about ECT. Change to: 
Note that a PCN-interior-node may change the ECN-field f=
rom 10 to 01 (NM to ThM), which would be interpreted by the e2e ECN as a ch=
ange from ECT(0) into ECT(1) –- hence it would not be compatible with=
 the (currently experimental) ECN nonce [RFC3540].
 <=
/o:p>
App C
<<But [RFC5129] was written while
  =
 PCN specifications were in early draft stages>>
The ‘But’ makes it sound like you’re updating 5129 (i do=
n’t think you are, if i remember right)
&nb=
sp;
ECT(0) -> NM
Etc (all 6 bullets=
 need to be changed)
 
After=
 the last bullet you could add
“The above sets o=
f codepoints are required for every PCN-compatible DSCP.”<=
/pre>
 
App D
In title &=
amp; , Discrepancy -> Difference
Apparent discrepan=
cy -> slight difference
(to me, discrepancy implies=
 something is wrong)
 
<&=
lt;The behaviour with only threshold marking keeps to the rule that
      ETM is more severe and must ne=
ver be changed to ThM even though
   &n=
bsp;  ETM is not a valid marking in this case.  >>
The behaviour with only threshold marking keeps to the rule of=
 Section 5.2.1 that
      ETM=
 is more severe and must never be changed to ThM (even though
      ETM is not a valid marking in this c=
ase).  
 
First bullet<=
o:p>
Your argument also means that a ThM should be correcte=
d to ETM (since the excess-traffic-metering behaviour depends on ETM marks =
on arriving packets). At the moment it only gets corrected when the meter w=
ants to ETM mark the pkt. 
But making this correction =
would require different code compared with the standard behaviour.
Personally i’d just delete the first bullet. If not, mak=
e it the second one (as it’s harder to understand)
 
 
 
Best wishes
phil
=
 
Philip Eardley  &n=
bsp;
Research and Technology Strategy

This em=
ail contains BT information, which may be privileged or confidential. It's =
meant only for the individual(s) or entity named above. If you're not the i=
ntended recipient, note that disclosing, copying, distributing or using thi=
s information is prohibited. If you've received this email in error, please=
 let me know immediately on the email address above. Thank you. We monitor =
our email system, and may record your emails.
<=
span style=3D'font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497=
D'>British Telecommunications plc
Registered office: 81 Newgate Street L=
ondon EC1A 7AJ
Registered in England no: 1800000
 
<=
p class=3DMsoNormal>From: pcn-bounces@ietf.org [mai=
lto:pcn-bounces@ietf.org] On Behalf Of Scott O Bradner
Sent: 31 July 2011 18:38
To: Toby Moncaster
Cc: pcn@ietf.o=
rg
Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.=
txt
 =

sigh - tooooo long a IETF meeting  :-)
 
Scott
 =
;
On Jul 31, 2011, at 6:09 AM, Toby=
 Moncaster wrote:


I'm guessing you mean comments by August 1=
5? (otherwise this will be a ~350
day LC!)

Toby


<=
/o:p>
-----Original Message-----
From: pcn-bounces@ietf.org [ma=
ilto:pcn-bounces@ietf.org] On Behalf Of
Sco=
tt O. Bradner
Sent: 30 July 2011 20:40=

To: pcn@ietf.or=
g
Subject: [PCN] WGLC for draft-ietf-pc=
n-3-in-1-encoding-07.txt
 <=
/p>
=

 
this starts a W=
GLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
comments by July 15 please
 
Scott=

_______________________________________________=

PCN mailing list
PCN@ietf.org
https://=
www.ietf.org/mailman/listinfo/pcn
 
&nb=
sp;
Scott Bradner<=
/o:p>
 
Harvard University Informati=
on Technology
S=
ecurity | Policy, Risk & Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138
=

 


 
= --_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_-- From menth@informatik.uni-tuebingen.de Sun Aug 7 07:20:10 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9F6B21F86B9 for ; Sun, 7 Aug 2011 07:20:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.801 X-Spam-Level: X-Spam-Status: No, score=-0.801 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_DE=0.35, HELO_MISMATCH_DE=1.448] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eM3VdJOGAgyY for ; Sun, 7 Aug 2011 07:20:10 -0700 (PDT) Received: from mx5.informatik.uni-tuebingen.de (mx5.Informatik.Uni-Tuebingen.De [134.2.12.32]) by ietfa.amsl.com (Postfix) with SMTP id D9BB321F86AB for ; Sun, 7 Aug 2011 07:20:08 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mx5.informatik.uni-tuebingen.de (Postfix) with ESMTP id CCB905292; Sun, 7 Aug 2011 16:20:21 +0200 (MEST) X-Virus-Scanned: amavisd-new at informatik.uni-tuebingen.de Received: from mx5.informatik.uni-tuebingen.de ([127.0.0.1]) by localhost (mx5.informatik.uni-tuebingen.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6oXwu-FKbn2p; Sun, 7 Aug 2011 16:20:15 +0200 (MEST) Received: from zcs-bs.informatik.uni-tuebingen.de (zcs-bs.Informatik.Uni-Tuebingen.De [134.2.12.62]) by mx5.informatik.uni-tuebingen.de (Postfix) with ESMTP id CF57F527D; Sun, 7 Aug 2011 16:20:14 +0200 (MEST) Received: from [192.168.1.100] (HSI-KBW-085-216-069-179.hsi.kabelbw.de [85.216.69.179]) by zcs-bs.informatik.uni-tuebingen.de (Postfix) with ESMTP id EAB7C234ADFF; Sun, 7 Aug 2011 16:20:04 +0200 (CEST) Message-ID: <4E3E9F15.9040400@informatik.uni-tuebingen.de> Date: Sun, 07 Aug 2011 16:20:05 +0200 From: Michael Menth User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0 MIME-Version: 1.0 To: pcn@ietf.org References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> In-Reply-To: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> Content-Type: multipart/mixed; boundary="------------010604090008000502020505" Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 07 Aug 2011 14:20:10 -0000 This is a multi-part message in MIME format. --------------010604090008000502020505 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi all, I have mostly editorial comments highlighted in the attached Word file. Regards, Michael Am 30.07.2011 21:39, schrieb Scott O. Bradner: > this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > > comments by July 15 please > > Scott > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www.ietf.org/mailman/listinfo/pcn --------------010604090008000502020505 Content-Type: application/msword; name="draft-ietf-pcn-3-in-1-encoding-07-MM.doc" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="draft-ietf-pcn-3-in-1-encoding-07-MM.doc" 0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAACAAAAzQAAAAAA AAAAEAAAzwAAAAEAAAD+////AAAAAMsAAADMAAAA//////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// 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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAD///////////////8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAABAAAA/v////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////wEA/v8DCgAA/////wYJAgAAAAAA wAAAAAAAAEYgAAAATWljcm9zb2Z0IFdvcmQgOTctMjAwMy1Eb2t1bWVudAAKAAAATVNXb3Jk RG9jABAAAABXb3JkLkRvY3VtZW50LjgA9DmycQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAA --------------010604090008000502020505-- From slblake@petri-meat.com Fri Aug 12 13:56:51 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A661611E80A6 for ; Fri, 12 Aug 2011 13:56:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -97 X-Spam-Level: X-Spam-Status: No, score=-97 tagged_above=-999 required=5 tests=[BAYES_95=3, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2wxhej36iOlM for ; Fri, 12 Aug 2011 13:56:51 -0700 (PDT) Received: from elom.tchmachines.com (elom.tchmachines.com [208.76.80.198]) by ietfa.amsl.com (Postfix) with ESMTP id 2949211E809B for ; Fri, 12 Aug 2011 13:56:51 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=petri-meat.com; h=Received:MIME-Version:Content-Type:Content-Transfer-Encoding:Date:From:To:Subject:Message-ID:X-Sender:User-Agent; b=wBMTuBz/EKsdf6x6TJVTCKp7FzT3UxeuFz+LcvVMPfOkLkIf8zXd2GZXmKmsQzQDV1ZX3OAhqv3qjb8fkA9L44mRB+JASdIC5nIKKiOT7XdgFyLmNJawz0vsgQqLvdYT; Received: from localhost ([127.0.0.1] helo=petri-meat.com) by elom.tchmachines.com with esmtpa (Exim 4.69) (envelope-from ) id 1QrynC-000097-Ib; Fri, 12 Aug 2011 16:57:22 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Date: Fri, 12 Aug 2011 16:57:22 -0400 From: Steven Blake To: Message-ID: X-Sender: slblake@petri-meat.com User-Agent: Roundcube Webmail/0.5.2 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - elom.tchmachines.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - petri-meat.com Subject: [PCN] Testing X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Aug 2011 20:56:51 -0000 please ignore // Steve From bob.briscoe@bt.com Thu Aug 18 02:38:07 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E3F0221F8A95 for ; Thu, 18 Aug 2011 02:38:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.469 X-Spam-Level: X-Spam-Status: No, score=-3.469 tagged_above=-999 required=5 tests=[AWL=0.130, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id G7AOjcwkum1X for ; Thu, 18 Aug 2011 02:38:06 -0700 (PDT) Received: from smtp2.smtp.bt.com (smtp2.smtp.bt.com [217.32.164.150]) by ietfa.amsl.com (Postfix) with ESMTP id 7E7F421F86BC for ; Thu, 18 Aug 2011 02:38:06 -0700 (PDT) Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 10:38:57 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 10:38:57 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1313660335871; Thu, 18 Aug 2011 10:38:55 +0100 Received: from MUT.jungle.bt.co.uk ([10.73.81.157]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7I9ctVq021721; Thu, 18 Aug 2011 10:38:55 +0100 Message-Id: <201108180938.p7I9ctVq021721@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 10:34:51 +0100 To: Michael Menth From: Bob Briscoe In-Reply-To: <4E3E9F15.9040400@informatik.uni-tuebingen.de> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <4E3E9F15.9040400@informatik.uni-tuebingen.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 09:38:57.0495 (UTC) FILETIME=[A6F69670:01CC5D8A] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 09:38:08 -0000 Michael, I like nearly all your editorial changes. In a couple of cases, they have made me notice an even better way of saying it. But in the first two cases, I prefer the original to your suggestion. I have said why in my annotation of your annotations here (mine are in red in the PDF) Bob At 15:20 07/08/2011, Michael Menth wrote: >Hi all, > >I have mostly editorial comments highlighted in the attached Word file. > >Regards, > > Michael > >Am 30.07.2011 21:39, schrieb Scott O. Bradner: >>this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >> >>comments by July 15 please >> >>Scott >>_______________________________________________ >>PCN mailing list >>PCN@ietf.org >>https://www.ietf.org/mailman/listinfo/pcn > > > ________________________________________________________________ Bob Briscoe, BT Innovate & Design From menth@informatik.uni-tuebingen.de Thu Aug 18 02:54:24 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4BD8A21F8A95 for ; Thu, 18 Aug 2011 02:54:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.801 X-Spam-Level: X-Spam-Status: No, score=-0.801 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_DE=0.35, HELO_MISMATCH_DE=1.448] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NP+Gf3VpUmY5 for ; Thu, 18 Aug 2011 02:54:23 -0700 (PDT) Received: from mx5.informatik.uni-tuebingen.de (mx5.Informatik.Uni-Tuebingen.De [134.2.12.32]) by ietfa.amsl.com (Postfix) with SMTP id 2C9B821F8862 for ; Thu, 18 Aug 2011 02:54:22 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mx5.informatik.uni-tuebingen.de (Postfix) with ESMTP id 920C75292; Thu, 18 Aug 2011 11:55:14 +0200 (MEST) X-Virus-Scanned: amavisd-new at informatik.uni-tuebingen.de Received: from mx5.informatik.uni-tuebingen.de ([127.0.0.1]) by localhost (mx5.informatik.uni-tuebingen.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id o7bICQ9pyQI2; Thu, 18 Aug 2011 11:55:08 +0200 (MEST) Received: from zcs-pu.informatik.uni-tuebingen.de (zcs-pu.Informatik.Uni-Tuebingen.De [134.2.12.61]) by mx5.informatik.uni-tuebingen.de (Postfix) with ESMTP id 25D3D5222; Thu, 18 Aug 2011 11:55:08 +0200 (MEST) Received: from [192.168.1.100] (HSI-KBW-085-216-069-179.hsi.kabelbw.de [85.216.69.179]) by zcs-pu.informatik.uni-tuebingen.de (Postfix) with ESMTP id F01791335B3A; Thu, 18 Aug 2011 11:55:07 +0200 (CEST) Message-ID: <4E4CE17C.3040705@informatik.uni-tuebingen.de> Date: Thu, 18 Aug 2011 11:55:08 +0200 From: Michael Menth User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0 MIME-Version: 1.0 To: Bob Briscoe References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <4E3E9F15.9040400@informatik.uni-tuebingen.de> <201108180938.p7I9ctVq021721@bagheera.jungle.bt.co.uk> In-Reply-To: <201108180938.p7I9ctVq021721@bagheera.jungle.bt.co.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 09:54:24 -0000 Hi Bob, the changes are fine with me. Best wishes, Michael Am 18.08.2011 11:34, schrieb Bob Briscoe: > Michael, > > I like nearly all your editorial changes. > > In a couple of cases, they have made me notice an even better way of > saying it. But in the first two cases, I prefer the original to your > suggestion. I have said why in my annotation of your annotations here > (mine are in red in the PDF) > > > > > > > Bob > > At 15:20 07/08/2011, Michael Menth wrote: >> Hi all, >> >> I have mostly editorial comments highlighted in the attached Word file. >> >> Regards, >> >> Michael >> >> Am 30.07.2011 21:39, schrieb Scott O. Bradner: >>> this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>> >>> comments by July 15 please >>> >>> Scott >>> _______________________________________________ >>> PCN mailing list >>> PCN@ietf.org >>> https://www.ietf.org/mailman/listinfo/pcn >> >> >> > > ________________________________________________________________ > Bob Briscoe, BT Innovate & Design -- Prof. Dr. habil. Michael Menth University of Tuebingen Faculty of Science Department of Computer Science Chair of Communication Networks Sand 13, 72076 Tuebingen, Germany phone: (+49)-7071/29-70505 fax: (+49)-7071/29-5220 mailto:menth@uni-tuebingen.de http://www-kn.informatik.uni-tuebingen.de From bob.briscoe@bt.com Thu Aug 18 03:07:25 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0269721F89BE for ; Thu, 18 Aug 2011 03:07:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.323 X-Spam-Level: X-Spam-Status: No, score=-1.323 tagged_above=-999 required=5 tests=[AWL=-2.021, BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_21=0.6, MANGLED_TOOL=2.3, MIME_QP_LONG_LINE=1.396, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZcBjsH+UjCNa for ; Thu, 18 Aug 2011 03:07:23 -0700 (PDT) Received: from smtp1.smtp.bt.com (smtp1.smtp.bt.com [217.32.164.137]) by ietfa.amsl.com (Postfix) with ESMTP id 106C021F8559 for ; Thu, 18 Aug 2011 03:07:14 -0700 (PDT) Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 11:08:06 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 11:08:06 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1313662084710; Thu, 18 Aug 2011 11:08:04 +0100 Received: from MUT.jungle.bt.co.uk ([10.73.81.157]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7IA80vG021855; Thu, 18 Aug 2011 11:08:00 +0100 Message-Id: <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 11:08:08 +0100 To: From: Bob Briscoe In-Reply-To: <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.doma in1.systemhost.net> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.domain1.systemhost.net> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1008626117==.ALT" X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 10:08:06.0137 (UTC) FILETIME=[B93C2E90:01CC5D8E] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 10:07:25 -0000 --=====================_1008626117==.ALT Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable Phil, Agree with everything. A few reponses inline.... At 10:03 05/08/2011, philip.eardley@bt.com wrote: >Content-Language: en-US >Content-Type: multipart/alternative; >=20 >boundary=3D"_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_" > >Here are some small comments =96 the doc looks=20 >very good and is ready for IESG i think > >S1 > ><< The baseline encoding defined in=20 >[RFC5696] described how two PCN>> > >Delete =91baseline=92 =96 just confusing for people in the future > ><< This document extends the baseline encoding by redefining the EXP>> > > This document amends the [RFC5696] encoding by redefining the 01 > >(and a couple of lines earlier where you mention=20 >EXP, add that this is 01 codepoint) > > >S2.1 > ><< Threshold-marked codepoint: a codepoint that indicates packets that > have been marked at a PCN-interior-node as a result of an > indication from the threshold-metering=20 > function [RFC5670]. > Abbreviated to ThM.>> > >I wonder if this would be clearer as > > Threshold-marked codepoint: a codepoint=20 > that indicates a packet has been threshold-marked, that is a packet that > has been marked at a PCN-interior-node as a result of an > indication from the threshold-metering=20 > function [RFC5670]. > Abbreviated to ThM. > >[firstly clearer to refer to =91packet=92 than=20 >=91packets=92, secondly uses the term =91threshold-marked=92 which was= defined in 5559] > >Similarly for excess-traffic-marked codepoint > ><< Not-marked codepoint: a codepoint that indicates PCN-packets but > that are not PCN-marked. Abbreviated to NM.>> > >delete =91but=92 > >S3 > ><< A PCN-node (i.e. a node within a PCN-domain) will be configured to > recognise certain DSCPs as=20 > PCN-compatible.=20 >= Ap= pendix=20 > A discusses the > choice of suitable DSCPs. In Figure 1 'DSCP n' indicates such a PCN- > compatible DSCP. Within the PCN-domain, any packet carrying a PCN- > compatible DSCP is a PCN-packet as defined=20 > in [RFC5559].>> > >A PCN-node (i.e. a node within a PCN-domain) will be configured to > recognise certain DSCP(s) as=20 > PCN-compatible.=20 >= Ap= pendix=20 > A discusses the > choice of suitable DSCP(s). In Figure 1 'DSCP n' indicates such a PCN- > compatible DSCP. Within the PCN-domain, any packet carrying a PCN- > compatible DSCP and with the ECN-field=20 > anything other than 00 (Not-PCN) is a=20 > PCN-packet as defined in [RFC5559]. > >[DSCPs =3D> DSCP(s). And added phrase in last sentence] > >4.2 > >Delete =93the baseline encoding =93 > >With =3D> that has [a Not-marked codepoint...] > >4.3 > ><< For the full 3-in-1 encoding to apply, any tunnel endpoints (IP-in-IP > and IPsec) within the PCN-domain MUST comply with the ECN > encapsulation and decapsulation rules set=20 > out in [RFC6040] (see >=20 >S= ection=20 >4.2). There is one exception to this rule outlined next. > > >> > >With one exception (see next paragraph), any tunnel endpoints (IP-in-IP > and IPsec) within the PCN-domain MUST comply with the ECN > encapsulation and decapsulation rules set=20 > out in [RFC6040] (see >=20 >S= ection=20 >4.2). > >S5 > ><< As mentioned in=20 >S= ection=20 >4.3 above, all PCN-nodes MUST comply with > [RFC6040].>> > >All PCN-nodes MUST comply with=20 >[RFC6040].=20 >Since PCN is a new capability, this is considered a reasonable requirement. >[note that it isn=92t mentioned in=20 >S= ection=20 >4.3 !] > >S5.2.3 > ><< Observant readers may spot an apparent inconsistency > between the two following=20 > cases.=20 >= Ap= pendix=20 > D explains the rationale > behind this inconsistency. > >> > >Ap= pendix=20 >D explains the rationale for the behaviours defined in this section. > >[i see no reason to worry the average reader with talk of inconsistency.] > >S5.3 > ><< marking is used it should treat ETM as ThM. However it SHOULD raise>> > > marking is used it SHOULD treat ETM as ThM. However it SHOULD raise > >s6.1 > ><< PCN-ingress- > nodes ensure that any packets entering the PCN-domain have the ECN > field in their outermost IP header set to the appropriate PCN > codepoint. >> > >CHANGE TO =93appropriate codepoint=94 (as it may be=20 >appropriate to set it to 00, which isn=92t a PCN codepoint) > >6.2 > >Thre =3D> there > >10 > >Criticism is misspelt > >Appendix A > >The para =93PCN-marking is intended... > >It wasn=92t clear to me whether PCN is operating=20 >on the whole aggregate of classes together, or=20 >on each class separately. Or whether either is possible. [BB] That depends totally on whether the classes=20 are all treated with the same scheduling=20 behaviour. If they're all in different queues,=20 PCN cannot be applied to the aggregate. If=20 they're all in the same queue, PCN cannot be applied to each class= separately. > >App B > ><< a. flow signalling associates > >a. flow signalling, which associates > > ><< Interactive Real-Time, > > Broadcast TV >> > >These have slightly different names in App A > > ><< Figure 2: Separation of tunneling and PCN actions > >=3D> tunnelling > > > a) Does not require admission control: > > b) Requires Admission-control: > >i think it would be helpful to add =93The e2e ECN=20 >traffic is not treated as PCN-traffic=94 and =93The=20 >e2e ECN traffic is treated as PCN-traffic=94 [BB] Unclear what you are asking for. > > ><< > * The PCN-ingress places this traffic in a tunnel with a PCN- > compatible DSCP in the outer header. The PCN-egress zeroes the > ECN-field before decapsulation. > > * The PCN-ingress drops CE-marked packets and the PCN-egress > zeros the ECN field of all PCN packets. > >> > >This can=92t be quite right, something like > > * The PCN-ingress places this traffic in=20 > a tunnel with, in the outer header, a=20 > PCN-compatible DSCP and the ECN-field set to=20 > Not-PCN. The PCN-egress zeroes the (outer) ECN-field before= decapsulation. [BB] Surely not. The intention is to preserve the=20 ECN field in the inner, and use PCN in the outer=20 over the PCN domain. Your proposal would prevent PCN being used. > * The PCN-ingress drops CE-marked=20 > packets and otherwise sets the ECN-field to NM,=20 > and sets the DCSP to a PCN-compatible DSCP [or=20 > requires that it=92s already in such a DSCP??].=20 > The PCN-egress zeroes the ECN field of all PCN=20 > packets; note this turns off e2e ECN. > >[note, =91zeroes=92] > >[i=92m not sure about the last bullet, is this what you mean>?] [BB] Yes >You could also correct PCN-ingress to=20 >PCN-ingress-node throughout the section; ditto PCN-egress. > >< > ECT(0) into ECT(1), which would not be compatible with the > > (currently experimental) ECN nonce=20 > [RFC3540].>> > >Well a PCN-interior-node doesn=92t know about ECT. Change to: > >Note that a PCN-interior-node may change the=20 >ECN-field from 10 to 01 (NM to ThM), which would=20 >be interpreted by the e2e ECN as a change from=20 >ECT(0) into ECT(1) =96- hence it would not be=20 >compatible with the (currently experimental) ECN=20 >nonce [RFC3540]. >App C > ><RFC5129] was written while > PCN specifications were in early draft stages>> > >The =91But=92 makes it sound like you=92re updating=20 >5129 (i don=92t think you are, if i remember right) [BB] OK. Delete 'But'. >ECT(0) -> NM > >Etc (all 6 bullets need to be changed) > > >After the last bullet you could add > >=93The above sets of codepoints are required for every PCN-compatible= DSCP.=94 [BB] Yup. > > >App D > >In title & , Discrepancy -> Difference > >Apparent discrepancy -> slight difference > >(to me, discrepancy implies something is wrong) [BB] OK, but no need to say 'slight', given it's a complete reversal. >< ETM is more severe and must never be changed to ThM even though > ETM is not a valid marking in this case. >> > >The behaviour with only threshold marking keeps=20 >to the rule of Section 5.2.1 that > ETM is more severe and must never be changed to ThM (even though > ETM is not a valid marking in this case). > > >First bullet > >Your argument also means that a ThM should be=20 >corrected to ETM (since the=20 >excess-traffic-metering behaviour depends on ETM=20 >marks on arriving packets). At the moment it=20 >only gets corrected when the meter wants to ETM mark the pkt. > >But making this correction would require=20 >different code compared with the standard behaviour. > >Personally i=92d just delete the first bullet. If=20 >not, make it the second one (as it=92s harder to understand) [BB] You're right. I agree we should just remove the first bullet. And I suggest we add your sentence about=20 requiring different code at the end of the remaining bullet. Thanks Bob > > > > > >Best wishes >phil > Philip Eardley >Research and Technology Strategy > >This email contains BT information, which may be=20 >privileged or confidential. It's meant only for=20 >the individual(s) or entity named above. If=20 >you're not the intended recipient, note that=20 >disclosing, copying, distributing or using this=20 >information is prohibited. If you've received=20 >this email in error, please let me know=20 >immediately on the email address above. Thank=20 >you. We monitor our email system, and may record your emails. >British Telecommunications plc >Registered office: 81 Newgate Street London EC1A 7AJ >Registered in England no: 1800000 > >From: pcn-bounces@ietf.org=20 >[mailto:pcn-bounces@ietf.org] On Behalf Of Scott O Bradner >Sent: 31 July 2011 18:38 >To: Toby Moncaster >Cc: pcn@ietf.org >Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > >sigh - tooooo long a IETF meeting :-) > >Scott > >On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: > > >I'm guessing you mean comments by August 15? (otherwise this will be a ~350 >day LC!) > >Toby > > >-----Original Message----- >From:=20 >pcn-bounces@ietf.org=20 > [mailto:pcn-bounces@ietf.org] On Behalf Of > >Scott O. Bradner > >Sent: 30 July 2011 20:40 > >To: pcn@ietf.org > >Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > > > > > >this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > > > >comments by July 15 please > > > >Scott > >_______________________________________________ > >PCN mailing list > >PCN@ietf.org > >https://www.ietf.org/mailman/listinfo/pcn > > > >Scott Bradner > >Harvard University Information Technology >Security | Policy, Risk & Compliance >+1 617 495 3864 >29 Oxford St., Room 407 >Cambridge, MA 02138 >www.harvard.edu/huit > > > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www.ietf.org/mailman/listinfo/pcn ________________________________________________________________ Bob Briscoe, BT Innovate & Design=20 --=====================_1008626117==.ALT Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Phil,

Agree with everything. A few reponses inline....

At 10:03 05/08/2011, philip.eardley@bt.com wrote:
Content-Language: en-US
Content-Type: multipart/alternative;
         boundary=3D"_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdom= a_"

Here are some small comments =96 the doc looks very good and is ready for IESG i think
 
S1

<<   The baseline encoding defined in
[RFC5696] described how
two PCN>>


Delete =91baseline=92 =96 just confusing for people in the
future


<<   This document extends the baseline encoding by
redefining the EXP>>


   This document amends the [RFC5696] encoding by
redefining the 01


(and a couple of lines earlier where you mention EXP, add that this
is 01 codepoint)


 

S2.1

<<   Threshold-marked codepoint:  a codepoint
that indicates packets that

      have been marked at a
PCN-interior-node as a result of an

      indication from the
threshold-metering function
[RFC5670].

      Abbreviated to
ThM.>>


I wonder if this would be clearer as


   Threshold-marked codepoint:  a codepoint that
indicates a packet has been threshold-marked, that is a packet
that

      has been marked at a
PCN-interior-node as a result of an

      indication from the
threshold-metering function
[RFC5670].

      Abbreviated to ThM.


[firstly clearer to refer to =91packet=92 than =91packets=92, secondly =
uses
the term =91threshold-marked=92 which was defined in 5559]


Similarly for excess-traffic-marked codepoint


<<   Not-marked codepoint:  a codepoint that
indicates PCN-packets but

      that are not PCN-marked. 
Abbreviated to NM.>>


delete =91but=92


S3


<< A PCN-node (i.e. a node within a PCN-domain) will be
configured to

   recognise certain DSCPs as PCN-compatible. 

Appendix A discusses the

   choice of suitable DSCPs.  In Figure 1 'DSCP n'
indicates such a PCN-

   compatible DSCP.  Within the PCN-domain, any
packet carrying a PCN-

   compatible DSCP is a PCN-packet as defined in
[RFC5559].>>


A PCN-node (i.e. a node within a PCN-domain) will be configured
to

   recognise certain DSCP(s) as PCN-compatible. 

Appendix A discusses the

   choice of suitable DSCP(s).  In Figure 1 'DSCP n'
indicates such a PCN-

   compatible DSCP.  Within the PCN-domain, any
packet carrying a PCN-

   compatible DSCP and with the ECN-field anything other
than 00 (Not-PCN) is a PCN-packet as defined in
[RFC5559].


[DSCPs =3D> DSCP(s). And added phrase in last sentence]

 
4.2

Delete =93the baseline encoding =93


With =3D> that has [a Not-marked codepoint...]


4.3


<< For the full 3-in-1 encoding to apply, any tunnel endpoints
(IP-in-IP

   and IPsec) within the PCN-domain MUST comply with the
ECN

   encapsulation and decapsulation rules set out in
[RFC6040]
(see

  

Section 4.2).  There is one exception to this rule outlined
next.


>> 


With one exception (see next paragraph), any tunnel endpoints
(IP-in-IP

   and IPsec) within the PCN-domain MUST comply with the
ECN

   encapsulation and decapsulation rules set out in
[RFC6040]
(see

  

Section 4.2).  


S5


<< As mentioned in

Section 4.3 above, all PCN-nodes MUST comply with

  
[RFC6040].>>


All PCN-nodes MUST comply with
[RFC6040]. Since PCN is
a new capability, this is considered a reasonable requirement.

[note that it isn=92t mentioned in

Section 4.3 !]


S5.2.3


<< Observant readers may spot an apparent
inconsistency

   between the two following cases. 

Appendix D explains the rationale

   behind this inconsistency.

>> 



Appendix D explains the rationale for the behaviours defined in this
section.


[i see no reason to worry the average reader with talk of
inconsistency.]


S5.3


<<   marking is used it should treat ETM as
ThM.  However it SHOULD raise>>


   marking is used it SHOULD treat ETM as ThM. 
However it SHOULD raise


s6.1


<< PCN-ingress-

   nodes ensure that any packets entering the PCN-domain
have the ECN

   field in their outermost IP header set to the
appropriate PCN

   codepoint. 
>>           &n=
bsp;            =
            



CHANGE TO =93appropriate codepoint=94 (as it may be appropriate to set
it to 00, which isn=92t a PCN codepoint)


6.2


Thre =3D> there


10


Criticism is misspelt 


Appendix A


The para =93PCN-marking is intended...


It wasn=92t clear to me whether PCN is operating on the whole
aggregate of classes together, or on each class separately. Or whether
either is possible.

[BB] That depends totally on whether the classes are all treated with the same scheduling behaviour. If they're all in different queues, PCN cannot be applied to the aggregate. If they're all in the same queue, PCN cannot be applied to each class separately.

 

App B


<< a.  flow signalling associates


a.  flow signalling, which associates

 


<< Interactive Real-Time,


       Broadcast TV
>>


These have slightly different names in App A

 


<< Figure 2: Separation of tunneling and PCN
actions


=3D> tunnelling

 


   a) Does not require admission control:


   b) Requires Admission-control:  


i think it would be helpful to add =93The e2e ECN traffic is not
treated as PCN-traffic=94 and =93The e2e ECN traffic is treated as
PCN-traffic=94

[BB] Unclear what you are asking for.

 


<< 

     *  The PCN-ingress places this traffic
in a tunnel with a PCN-

         compatible DSCP in
the outer header.  The PCN-egress zeroes the

         ECN-field before
decapsulation.


      *  The PCN-ingress drops
CE-marked packets and the PCN-egress

         zeros the ECN field
of all PCN packets.

>> 


This can=92t be quite right, something like


     *  The PCN-ingress places this traffic
in a tunnel with, in the outer header, a PCN-compatible DSCP and the
ECN-field set to Not-PCN.  The PCN-egress zeroes the
(outer) ECN-field before decapsulation.

[BB] Surely not. The intention is to preserve the ECN field in the inner, and use PCN in the outer over the PCN domain. Your proposal would prevent PCN being used.


      *  The PCN-ingress drops CE-marked
packets and otherwise sets the ECN-field to NM, and sets the DCSP to a
PCN-compatible DSCP [or requires that it=92s already in such a DSCP??]. The
PCN-egress zeroes the ECN field of all PCN packets; note this turns off
e2e ECN.


[note, =91zeroes=92]


[i=92m not sure about the last bullet, is this what you mean>?]

[BB] Yes


You could also correct
PCN-ingress to PCN-ingress-node throughout the section; ditto
PCN-egress.


<<Note that a PCN interior node may turn


      ECT(0) into ECT(1), which would not
be compatible with the


      (currently experimental) ECN nonce
[RFC3540].>>


Well a PCN-interior-node doesn=92t know about ECT. Change to:



Note that a PCN-interior-node may change the ECN-field from 10 to 01
(NM to ThM), which would be interpreted by the e2e ECN as a change from
ECT(0) into ECT(1) =96- hence it would not be compatible with the
(currently experimental) ECN nonce
[RFC3540].

App C


<<But
[RFC5129] was written
while

   PCN specifications were in early draft
stages>>


The =91But=92 makes it sound like you=92re updating 5129 (i don=92t thi=
nk
you are, if i remember right)

[BB] OK. Delete 'But'.


ECT(0) ->
NM


Etc (all 6 bullets need to be changed)



After the last bullet you could add


=93The above sets of codepoints are required for every PCN-compatible
DSCP.=94

[BB] Yup.

 


App D


In title & , Discrepancy -> Difference


Apparent discrepancy -> slight difference


(to me, discrepancy implies something is wrong)

[BB] OK, but no need to say 'slight', given it's a complete reversal.


<<The behaviour wi=
th
only threshold marking keeps to the rule that

      ETM is more severe and must never be
changed to ThM even though

      ETM is not a valid marking in this
case.  >>


The behaviour with only threshold marking keeps to the rule of
Section 5.2.1 that

      ETM is more severe and must never be
changed to ThM (even though

      ETM is not a valid marking in this
case).  



First bullet


Your argument also means that a ThM should be corrected to ETM
(since the excess-traffic-metering behaviour depends on ETM marks on
arriving packets). At the moment it only gets corrected when the meter
wants to ETM mark the pkt. 


But making this correction would require different code compared
with the standard behaviour.


Personally i=92d just delete the first bullet. If not, make it the
second one (as it=92s harder to understand)

[BB] You're right. I agree we should just remove the first bullet.
And I suggest we add your sentence about requiring different code at the end of the remaining bullet.

Thanks



Bob


 


 


 

Best wishes
phil
 Philip Eardley  
Research and Technology Strategy

This email contains BT information, which may be privileged or confidential. It's meant only for the individual(s) or entity named above. If you're not the intended recipient, note that disclosing, copying, distributing or using this information is prohibited. If you've received this email in error, please let me know immediately on the email address above. Thank you. We monitor our email system, and may record your emails.
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From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of Scott O Bradner
Sent: 31 July 2011 18:38
To: Toby Moncaster
Cc: pcn@ietf.org
Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
sigh - tooooo long a IETF meeting  :-)
 
Scott
 
On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote:


I'm guessing you mean comments by August 15? (otherwise this will be a ~350
day LC!)

Toby


-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of

Scott O. Bradner

Sent: 30 July 2011 20:40

To: pcn@ietf.org

Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt

 

 

this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt

 

comments by July 15 please

 

Scott

_______________________________________________

PCN mailing list

PCN@ietf.org

https://www.ietf.org/mailman/listinfo/pcn

 
 
Scott Bradner
 
Harvard University Information Technology
Security | Policy, Risk & Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138
www.harvard.edu/huit
 


 
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

________________________________________________________________
Bob Briscoe,           &n= bsp;            =         BT Innovate & Design --=====================_1008626117==.ALT-- From bob.briscoe@bt.com Thu Aug 18 03:16:10 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C98321F8B14 for ; Thu, 18 Aug 2011 03:16:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.438 X-Spam-Level: X-Spam-Status: No, score=-3.438 tagged_above=-999 required=5 tests=[AWL=0.160, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3rp6xOqeaiuI for ; Thu, 18 Aug 2011 03:16:09 -0700 (PDT) Received: from smtp3.smtp.bt.com (smtp3.smtp.bt.com [217.32.164.138]) by ietfa.amsl.com (Postfix) with ESMTP id 9AD9321F8A7E for ; Thu, 18 Aug 2011 03:16:08 -0700 (PDT) Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp3.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 11:16:59 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 11:16:59 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1313662617599; Thu, 18 Aug 2011 11:16:57 +0100 Received: from MUT.jungle.bt.co.uk ([10.73.81.157]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7IAGui4021893; Thu, 18 Aug 2011 11:16:56 +0100 Message-Id: <201108181016.p7IAGui4021893@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 11:17:04 +0100 To: Scott O Bradner From: Bob Briscoe In-Reply-To: References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1009162078==.ALT" X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 10:16:59.0365 (UTC) FILETIME=[F7105150:01CC5D8F] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 10:16:10 -0000 --=====================_1009162078==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Scott, Now WGLC is over, we've had two useful reviews from Michael (a co-author) and Phil with a reasonably large number of editorial changes. Assuming the outstanding conversations converge, I don't think there are any disagreements on the technical effect, or on anything normative. I think there's enough editorial changes to warrant a rev before sending to the IESG. However, if you would rather it goes straight to the IESG, I wouldn't fight. if I recall correctly none of the requested changes imply the existing text is completely incomprehensible. Your call... Bob At 23:38 31/07/2011, Scott O Bradner wrote: >sigh - tooooo long a IETF meeting :-) > >Scott > >On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: > >>I'm guessing you mean comments by August 15? (otherwise this will be a ~350 >>day LC!) >> >>Toby >> >>>-----Original Message----- >>>From: pcn-bounces@ietf.org >>>[mailto:pcn-bounces@ietf.org] On Behalf Of >>>Scott O. Bradner >>>Sent: 30 July 2011 20:40 >>>To: pcn@ietf.org >>>Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>> >>> >>>this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>> >>>comments by July 15 please >>> >>>Scott >>>_______________________________________________ >>>PCN mailing list >>>PCN@ietf.org >>>https://www.ietf.org/mailman/listinfo/pcn > >Scott Bradner > >Harvard University Information Technology >Security | Policy, Risk & Compliance >+1 617 495 3864 >29 Oxford St., Room 407 >Cambridge, MA 02138 >www.harvard.edu/huit > > > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www.ietf.org/mailman/listinfo/pcn ________________________________________________________________ Bob Briscoe, BT Innovate & Design --=====================_1009162078==.ALT Content-Type: text/html; charset="us-ascii" Scott,

Now WGLC is over, we've had two useful reviews from Michael (a co-author) and Phil with a reasonably large number of editorial changes.

Assuming the outstanding conversations converge, I don't think there are any disagreements on the technical effect, or on anything normative.

I think there's enough editorial changes to warrant a rev before sending to the IESG. However, if you would rather it goes straight to the IESG, I wouldn't fight. if I recall correctly none of the requested changes imply the existing text is completely incomprehensible.

Your call...


Bob

At 23:38 31/07/2011, Scott O Bradner wrote:

sigh - tooooo long a IETF meeting  :-)

Scott

On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote:

I'm guessing you mean comments by August 15? (otherwise this will be a ~350
day LC!)

Toby

-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of
Scott O. Bradner
Sent: 30 July 2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt


this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt

comments by July 15 please

Scott
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

Scott Bradner

Harvard University Information Technology
Security | Policy, Risk & Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138
www.harvard.edu/huit




_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

________________________________________________________________
Bob Briscoe,                                BT Innovate & Design --=====================_1009162078==.ALT-- From toby@moncaster.com Thu Aug 18 03:24:09 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2D9FF21F8B33 for ; Thu, 18 Aug 2011 03:24:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.652 X-Spam-Level: X-Spam-Status: No, score=0.652 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_DE=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_21=0.6, MANGLED_TOOL=2.3] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OE4HnMOt2k24 for ; Thu, 18 Aug 2011 03:24:03 -0700 (PDT) Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.187]) by ietfa.amsl.com (Postfix) with ESMTP id CCFCC21F8B2F for ; Thu, 18 Aug 2011 03:24:02 -0700 (PDT) Received: from TobysHP (host86-152-89-171.range86-152.btcentralplus.com [86.152.89.171]) by mrelayeu.kundenserver.de (node=mreu1) with ESMTP (Nemesis) id 0MIjAi-1QrmrF1Qi0-002HmM; Thu, 18 Aug 2011 12:24:55 +0200 From: "Toby Moncaster" To: "'Bob Briscoe'" , References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.domain1.systemhost.net> <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> In-Reply-To: <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> Date: Thu, 18 Aug 2011 11:24:50 +0100 Message-ID: <00cf01cc5d91$102764c0$30762e40$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D0_01CC5D99.71EBCCC0" X-Mailer: Microsoft Office Outlook 12.0 thread-index: AcxdjsNJ0uHq/UyHSXSYtjHhJbOSbgAAiG8Q Content-Language: en-gb X-Provags-ID: V02:K0:NnOlVJF7w2FnVdrCF1Y9ZtCcXooy2hHydTyX6zvpDTq BUyv9Xsbq7OSMJPQpex+HNPq9raT5Y29WnoDrWmB5y6TMUjYDm KLGk7Oaua1iLeO8/eFU3WKl7W4gcSnRZqw5f3wE48ZLKmagPap YCQkG1lPIhbld1Xx/lbUDCj3gXRT8YK6uVInxLQ8POGQw8TpsG R1A10jrY/T34ZL28pijMnNw2OVo5knpPQJgsd7EEDs= Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 10:24:09 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_00D0_01CC5D99.71EBCCC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Bob, Is there any chance you will be able to take over the pen for a final round of tweaks now the WGLC is over? I'm going to be fairly busy over the next few weeks. Toby From: pcn-bounces@ietf.org [mailto:pcn-bounces@ietf.org] On Behalf Of Bob Briscoe Sent: 18 August 2011 11:08 To: philip.eardley@bt.com Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt Phil, Agree with everything. A few reponses inline.... At 10:03 05/08/2011, philip.eardley@bt.com wrote: Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_" Here are some small comments - the doc looks very good and is ready for IESG i think S1 << The baseline encoding defined in [RFC5696 ] described how two PCN>> Delete 'baseline' - just confusing for people in the future << This document extends the baseline encoding by redefining the EXP>> This document amends the [RFC5696] encoding by redefining the 01 (and a couple of lines earlier where you mention EXP, add that this is 01 codepoint) S2.1 << Threshold-marked codepoint: a codepoint that indicates packets that have been marked at a PCN-interior-node as a result of an indication from the threshold-metering function [RFC5670 ]. Abbreviated to ThM.>> I wonder if this would be clearer as Threshold-marked codepoint: a codepoint that indicates a packet has been threshold-marked, that is a packet that has been marked at a PCN-interior-node as a result of an indication from the threshold-metering function [RFC5670 ]. Abbreviated to ThM. [firstly clearer to refer to 'packet' than 'packets', secondly uses the term 'threshold-marked' which was defined in 5559] Similarly for excess-traffic-marked codepoint << Not-marked codepoint: a codepoint that indicates PCN-packets but that are not PCN-marked. Abbreviated to NM.>> delete 'but' S3 << A PCN-node (i.e. a node within a PCN-domain) will be configured to recognise certain DSCPs as PCN-compatible. Appendix A discusses the choice of suitable DSCPs. In Figure 1 'DSCP n' indicates such a PCN- compatible DSCP. Within the PCN-domain, any packet carrying a PCN- compatible DSCP is a PCN-packet as defined in [RFC5559 ].>> A PCN-node (i.e. a node within a PCN-domain) will be configured to recognise certain DSCP(s) as PCN-compatible. Appendix A discusses the choice of suitable DSCP(s). In Figure 1 'DSCP n' indicates such a PCN- compatible DSCP. Within the PCN-domain, any packet carrying a PCN- compatible DSCP and with the ECN-field anything other than 00 (Not-PCN) is a PCN-packet as defined in [RFC5559 ]. [DSCPs => DSCP(s). And added phrase in last sentence] 4.2 Delete "the baseline encoding " With => that has [a Not-marked codepoint...] 4.3 << For the full 3-in-1 encoding to apply, any tunnel endpoints (IP-in-IP and IPsec) within the PCN-domain MUST comply with the ECN encapsulation and decapsulation rules set out in [RFC6040 ] (see Section 4.2 ). There is one exception to this rule outlined next. >> With one exception (see next paragraph), any tunnel endpoints (IP-in-IP and IPsec) within the PCN-domain MUST comply with the ECN encapsulation and decapsulation rules set out in [RFC6040 ] (see Section 4.2 ). S5 << As mentioned in Section 4.3 above, all PCN-nodes MUST comply with [RFC6040 ].>> All PCN-nodes MUST comply with [RFC6040 ]. Since PCN is a new capability, this is considered a reasonable requirement. [note that it isn't mentioned in Section 4.3 !] S5.2.3 << Observant readers may spot an apparent inconsistency between the two following cases. Appendix D explains the rationale behind this inconsistency. >> Appendix D explains the rationale for the behaviours defined in this section. [i see no reason to worry the average reader with talk of inconsistency.] S5.3 << marking is used it should treat ETM as ThM. However it SHOULD raise>> marking is used it SHOULD treat ETM as ThM. However it SHOULD raise s6.1 << PCN-ingress- nodes ensure that any packets entering the PCN-domain have the ECN field in their outermost IP header set to the appropriate PCN codepoint. >> CHANGE TO "appropriate codepoint" (as it may be appropriate to set it to 00, which isn't a PCN codepoint) 6.2 Thre => there 10 Criticism is misspelt Appendix A The para "PCN-marking is intended... It wasn't clear to me whether PCN is operating on the whole aggregate of classes together, or on each class separately. Or whether either is possible. [BB] That depends totally on whether the classes are all treated with the same scheduling behaviour. If they're all in different queues, PCN cannot be applied to the aggregate. If they're all in the same queue, PCN cannot be applied to each class separately. App B << a. flow signalling associates a. flow signalling, which associates << Interactive Real-Time, Broadcast TV >> These have slightly different names in App A << Figure 2: Separation of tunneling and PCN actions => tunnelling a) Does not require admission control: b) Requires Admission-control: i think it would be helpful to add "The e2e ECN traffic is not treated as PCN-traffic" and "The e2e ECN traffic is treated as PCN-traffic" [BB] Unclear what you are asking for. << * The PCN-ingress places this traffic in a tunnel with a PCN- compatible DSCP in the outer header. The PCN-egress zeroes the ECN-field before decapsulation. * The PCN-ingress drops CE-marked packets and the PCN-egress zeros the ECN field of all PCN packets. >> This can't be quite right, something like * The PCN-ingress places this traffic in a tunnel with, in the outer header, a PCN-compatible DSCP and the ECN-field set to Not-PCN. The PCN-egress zeroes the (outer) ECN-field before decapsulation. [BB] Surely not. The intention is to preserve the ECN field in the inner, and use PCN in the outer over the PCN domain. Your proposal would prevent PCN being used. * The PCN-ingress drops CE-marked packets and otherwise sets the ECN-field to NM, and sets the DCSP to a PCN-compatible DSCP [or requires that it's already in such a DSCP??]. The PCN-egress zeroes the ECN field of all PCN packets; note this turns off e2e ECN. [note, 'zeroes'] [i'm not sure about the last bullet, is this what you mean>?] [BB] Yes You could also correct PCN-ingress to PCN-ingress-node throughout the section; ditto PCN-egress. < ].>> Well a PCN-interior-node doesn't know about ECT. Change to: Note that a PCN-interior-node may change the ECN-field from 10 to 01 (NM to ThM), which would be interpreted by the e2e ECN as a change from ECT(0) into ECT(1) -- hence it would not be compatible with the (currently experimental) ECN nonce [RFC3540 ]. App C < ] was written while PCN specifications were in early draft stages>> The 'But' makes it sound like you're updating 5129 (i don't think you are, if i remember right) [BB] OK. Delete 'But'. ECT(0) -> NM Etc (all 6 bullets need to be changed) After the last bullet you could add "The above sets of codepoints are required for every PCN-compatible DSCP." [BB] Yup. App D In title & , Discrepancy -> Difference Apparent discrepancy -> slight difference (to me, discrepancy implies something is wrong) [BB] OK, but no need to say 'slight', given it's a complete reversal. <> The behaviour with only threshold marking keeps to the rule of Section 5.2.1 that ETM is more severe and must never be changed to ThM (even though ETM is not a valid marking in this case). First bullet Your argument also means that a ThM should be corrected to ETM (since the excess-traffic-metering behaviour depends on ETM marks on arriving packets). At the moment it only gets corrected when the meter wants to ETM mark the pkt. But making this correction would require different code compared with the standard behaviour. Personally i'd just delete the first bullet. If not, make it the second one (as it's harder to understand) [BB] You're right. I agree we should just remove the first bullet. And I suggest we add your sentence about requiring different code at the end of the remaining bullet. Thanks Bob Best wishes phil Philip Eardley Research and Technology Strategy This email contains BT information, which may be privileged or confidential. It's meant only for the individual(s) or entity named above. If you're not the intended recipient, note that disclosing, copying, distributing or using this information is prohibited. If you've received this email in error, please let me know immediately on the email address above. Thank you. We monitor our email system, and may record your emails. British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no: 1800000 From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org ] On Behalf Of Scott O Bradner Sent: 31 July 2011 18:38 To: Toby Moncaster Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt sigh - tooooo long a IETF meeting :-) Scott On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: I'm guessing you mean comments by August 15? (otherwise this will be a ~350 day LC!) Toby -----Original Message----- From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org ] On Behalf Of Scott O. Bradner Sent: 30 July 2011 20:40 To: pcn@ietf.org Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt comments by July 15 please Scott _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn Scott Bradner Harvard University Information Technology Security | Policy, Risk & Compliance +1 617 495 3864 29 Oxford St., Room 407 Cambridge, MA 02138 www.harvard.edu/huit _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn ________________________________________________________________ Bob Briscoe, BT Innovate & Design ------=_NextPart_000_00D0_01CC5D99.71EBCCC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bob,

 

Is there any chance you will be able to take over the pen for a final = round of tweaks now the WGLC is over? I’m going to be fairly busy = over the next few weeks.

 

Toby

 

From:= = pcn-bounces@ietf.org [mailto:pcn-bounces@ietf.org] On Behalf Of = Bob Briscoe
Sent: 18 August 2011 11:08
To: = philip.eardley@bt.com
Cc: pcn@ietf.org
Subject: Re: = [PCN] WGLC for = draft-ietf-pcn-3-in-1-encoding-07.txt

 

Phil,

Agree with everything. A few reponses = inline....

At 10:03 05/08/2011, philip.eardley@bt.com = wrote:

Content-Language: en-US
Content-Type: = multipart/alternative;
        = ; = boundary=3D"_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRD= doma_"

Here are some small comments = – the doc looks very good and is ready for IESG i = think
 
S1

<<   The =
baseline encoding defined in
[RFC5696] described =
how
two PCN>>

 

Delete =
‘baseline’ – just confusing for people in =
the
future

 

<< &n=
bsp; This document extends the baseline encoding =
by
redefining the EXP>>

 

   =
This document amends the [RFC5696] encoding =
by
redefining the 01

 

(and a couple =
of lines earlier where you mention EXP, add that =
this
is 01 codepoint)

 

 


S2.1

<< =
  Threshold-marked codepoint:  a =
codepoint
that indicates packets =
that

 

     =
; have been marked at a
PCN-interior-node as a =
result of an

 

     =
; indication from the
threshold-metering =
function
[RFC5670].
 
     =
; Abbreviated to
ThM.>>
 
I wonder if =
this would be clearer as
 
   =
Threshold-marked codepoint:  a codepoint =
that
indicates a packet has been threshold-marked, =
that is a packet
that
 
     =
; has been marked at a
PCN-interior-node as a =
result of an
 
     =
; indication from the
threshold-metering =
function
[RFC5670].
 
     =
; Abbreviated to ThM.
 
[firstly =
clearer to refer to ‘packet’ than ‘packets’, =
secondly uses
the term =
‘threshold-marked’ which was defined in =
5559]
 
Similarly for =
excess-traffic-marked codepoint
 
<< &n=
bsp; Not-marked codepoint:  a codepoint =
that
indicates PCN-packets but
 
     =
; that are not PCN-marked. 
Abbreviated to =
NM.>>
 
delete =
‘but’
 
S3
 
<< A =
PCN-node (i.e. a node within a PCN-domain) will =
be
configured to
 
   recognise =
certain DSCPs as PCN-compatible. 
Appendix A discusses the
 
   choice of =
suitable DSCPs.  In Figure 1 'DSCP =
n'
indicates such a PCN-
 
   compatible =
DSCP.  Within the PCN-domain, any
packet =
carrying a PCN-
 
   compatible DSCP =
is a PCN-packet as defined in
[RFC5559].>>
 
A PCN-node =
(i.e. a node within a PCN-domain) will be =
configured
to
 
   recognise =
certain DSCP(s) as PCN-compatible. 
Appendix A discusses the
 
   choice of =
suitable DSCP(s).  In Figure 1 'DSCP =
n'
indicates such a PCN-
 
   compatible =
DSCP.  Within the PCN-domain, any
packet =
carrying a PCN-
 
   compatible DSCP =
and with the ECN-field anything other
than 00 =
(Not-PCN) is a PCN-packet as defined in
[RFC5559].
 
[DSCPs =3D> =
DSCP(s). And added phrase in last sentence]

 
4.2
Delet=
e “the baseline encoding “
 
With =3D> =
that has [a Not-marked codepoint...]
 
4.3
 
<< For =
the full 3-in-1 encoding to apply, any tunnel =
endpoints
(IP-in-IP
 
   and IPsec) =
within the PCN-domain MUST comply with =
the
ECN
 
   encapsulation =
and decapsulation rules set out in
[RFC6040]
=

(see
 
  
=

Section 4.2).  There is one exception to this =
rule outlined
next.
 
>> =

 
With one =
exception (see next paragraph), any tunnel =
endpoints
(IP-in-IP
 
   and IPsec) =
within the PCN-domain MUST comply with =
the
ECN
 
   encapsulation =
and decapsulation rules set out in
[RFC6040]
=

(see
 
  
=

Section 4.2).  
 
S5
 
<< As =
mentioned in
Section 4.3 above, all PCN-nodes MUST comply =
with
 
  
=

[RFC6040].>>
 
All PCN-nodes =
MUST comply with
[RFC6040]. Since PCN =
is
a new capability, this is considered a =
reasonable requirement.
 
[note that it isn’t =
mentioned in
Section 4.3 !]
 
S5.2.3
 
<< =
Observant readers may spot an =
apparent
inconsistency
 
   between the two =
following cases. 
Appendix D explains the rationale
 
   behind this =
inconsistency.
 
>> 
 
 
Appendix D explains the rationale for the behaviours =
defined in this
section.
 
[i see no =
reason to worry the average reader with talk =
of
inconsistency.]
 
S5.3<=
/pre>
 
<< &n=
bsp; marking is used it should treat ETM =
as
ThM.  However it SHOULD =
raise>>
 
   =
marking is used it SHOULD treat ETM as =
ThM. 
However it SHOULD =
raise
 
s6.1<=
/pre>
 
<< =
PCN-ingress-
 
   nodes ensure =
that any packets entering the PCN-domain
have the =
ECN
 
   field in their =
outermost IP header set to the
appropriate =
PCN
 
   =
codepoint. 
>>    &nb=
sp;           &nbs=
p;            =
;       
 
CHANGE TO =
“appropriate codepoint” (as it may be appropriate to =
set
it to 00, which isn’t a PCN =
codepoint)
 
6.2
 
Thre =3D> =
there
 
10
 
Criticism is =
misspelt 
 
Appendix =
A
 
The para =
“PCN-marking is intended...
 
It wasn’t =
clear to me whether PCN is operating on the =
whole
aggregate of classes together, or on each =
class separately. Or whether
either is =
possible.

[BB] That depends =
totally on whether the classes are all treated with the same scheduling =
behaviour. If they're all in different queues, PCN cannot be applied to =
the aggregate. If they're all in the same queue, PCN cannot be applied =
to each class =
separately.


 
 
App B
 
<< =
a.  flow signalling associates
 
a.  flow =
signalling, which associates
 
 
 
<< =
Interactive Real-Time,
 
  &nbs=
p;    Broadcast =
TV
>> 
 
These have =
slightly different names in App A
 
 
 
<< Figure =
2: Separation of tunneling and =
PCN
actions
 
=3D> =
tunnelling
 
 
 
   a) =
Does not require admission control:
 
   b) =
Requires Admission-control:  
 
i think it =
would be helpful to add “The e2e ECN traffic is =
not
treated as PCN-traffic” and “The =
e2e ECN traffic is treated =
as
PCN-traffic”

[BB] Unclear what you are asking =
for.


 
 
<< =

 
     =
*  The PCN-ingress places this traffic
in a =
tunnel with a PCN-
 
     =
;    compatible DSCP in
the outer =
header.  The PCN-egress zeroes the
 
     =
;    ECN-field =
before
decapsulation.
 
  &nbs=
p;   *  The PCN-ingress =
drops
CE-marked packets and the =
PCN-egress
 
     =
;    zeros the ECN field
of all PCN =
packets.
 
>> 
 
This =
can’t be quite right, something like
 
  &nbs=
p;  *  The PCN-ingress places this =
traffic
in a tunnel with, in the outer header, a =
PCN-compatible DSCP and the
ECN-field set to =
Not-PCN.  The PCN-egress zeroes the
(outer) =
ECN-field before decapsulation.

[BB] Surely not. The intention is to preserve the =
ECN field in the inner, and use PCN in the outer over the PCN domain. =
Your proposal would prevent PCN being =
used.



 
&nbs=
p;     *  The PCN-ingress drops =
CE-marked
packets and otherwise sets the ECN-field =
to NM, and sets the DCSP to a
PCN-compatible DSCP =
[or requires that it’s already in such a DSCP??]. =
The
PCN-egress zeroes the ECN field of all PCN =
packets; note this turns off
e2e =
ECN.
 
[note, =
‘zeroes’]
 
[i’m not =
sure about the last bullet, is this what you =
mean>?]

[BB] =
Yes



You could also =
correct
PCN-ingress to PCN-ingress-node throughout =
the section; ditto
PCN-egress.
 
<<Note =
that a PCN interior node may turn
 
  &nbs=
p;   ECT(0) into ECT(1), which would =
not
be compatible with the
 
  &nbs=
p;   (currently experimental) ECN =
nonce
[RFC3540].>>
 
Well a =
PCN-interior-node doesn’t know about ECT. Change =
to:
 
Note that a =
PCN-interior-node may change the ECN-field from 10 to =
01
(NM to ThM), which would be interpreted by the =
e2e ECN as a change from
ECT(0) into ECT(1) =
–- hence it would not be compatible with =
the
(currently experimental) ECN =
nonce
[RFC3540].
 
App C
 
<<But=

[RFC5129] was =
written
while
 
   PCN =
specifications were in early =
draft
stages>>
 
The =
‘But’ makes it sound like you’re updating 5129 (i =
don’t think
you are, if i remember =
right)

[BB] OK. Delete =
'But'.



ECT(0) =
->
NM
 
Etc (all 6 =
bullets need to be changed)


After the =
last bullet you could add
 
“The =
above sets of codepoints are required for every =
PCN-compatible
DSCP.”

[BB] =
Yup.


 
 
App =
D
 
In title & =
, Discrepancy -> Difference
 
Apparent =
discrepancy -> slight difference
 
(to me, =
discrepancy implies something is wrong)

[BB] OK, but no need to say 'slight', given it's a =
complete reversal.



<<The =
behaviour with
only threshold marking keeps to the =
rule that
 
     =
; ETM is more severe and must never be
changed to =
ThM even though
 
     =
; ETM is not a valid marking in this
case.  =
>>
 
The behaviour =
with only threshold marking keeps to the rule =
of
Section 5.2.1 that
 
     =
; ETM is more severe and must never be
changed to =
ThM (even though
 
     =
; ETM is not a valid marking in this
case).  =



First =
bullet
 
Your argument =
also means that a ThM should be corrected to =
ETM
(since the excess-traffic-metering behaviour =
depends on ETM marks on
arriving packets). At the =
moment it only gets corrected when the meter
wants =
to ETM mark the pkt. 
 
But making this =
correction would require different code =
compared
with the standard =
behaviour.
 
Personally =
i’d just delete the first bullet. If not, make it =
the
second one (as it’s harder to =
understand)

[BB] You're right. =
I agree we should just remove the first bullet.
And I suggest we add =
your sentence about requiring different code at the end of the remaining =
bullet.

Thanks



Bob



 
 
 
 
 

Best wishes
phil
 Philip =
Eardley   
Research and Technology =
Strategy

This email contains BT information, which may be =
privileged or confidential. It's meant only for the individual(s) or =
entity named above. If you're not the intended recipient, note that =
disclosing, copying, distributing or using this information is =
prohibited. If you've received this email in error, please let me know =
immediately on the email address above. Thank you. We monitor our email =
system, and may record your emails.
British Telecommunications =
plc
Registered office: 81 Newgate Street London EC1A =
7AJ
Registered in England no: 1800000
 
From: =
pcn-bounces@ietf.org [ =
mailto:pcn-bounces@ietf.org] On Behalf Of Scott O =
Bradner
Sent: 31 July 2011 18:38
To: Toby =
Moncaster
Cc: pcn@ietf.org
Subject: Re: [PCN] WGLC =
for draft-ietf-pcn-3-in-1-encoding-07.txt
 
sigh - tooooo =
long a IETF meeting  :-)
 
Scott
 
On Jul 31, =
2011, at 6:09 AM, Toby Moncaster wrote:


I'm guessing you mean =
comments by August 15? (otherwise this will be a ~350
day =
LC!)

Toby


-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] =
On Behalf Of
Scott O. Bradner
Sent: 30 July 2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for =
draft-ietf-pcn-3-in-1-encoding-07.txt
 
 
this starts a WGLC for =
draft-ietf-pcn-3-in-1-encoding-07.txt
 
comments by July 15 please
 
Scott
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/m=
ailman/listinfo/pcn
 
 
Scott Bradner
 
Harvard =
University Information Technology
Security | Policy, Risk & =
Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, =
MA 02138
www.harvard.edu/huit
 

 
_______________________________________________
PC=
N mailing list
PCN@ietf.org
https://www.ietf.org/m=
ailman/listinfo/pcn
________________________________=
________________________________
Bob =
Briscoe,           =
;            =
         BT Innovate & =
Design
------=_NextPart_000_00D0_01CC5D99.71EBCCC0-- From philip.eardley@bt.com Thu Aug 18 03:26:55 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6405221F8B39 for ; Thu, 18 Aug 2011 03:26:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.571 X-Spam-Level: X-Spam-Status: No, score=-102.571 tagged_above=-999 required=5 tests=[AWL=-0.126, BAYES_00=-2.599, HELO_MISMATCH_COM=0.553, HTML_MESSAGE=0.001, J_CHICKENPOX_21=0.6, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uvUFpok1lsZn for ; Thu, 18 Aug 2011 03:26:53 -0700 (PDT) Received: from smtpe1.intersmtp.com (smtp64.intersmtp.COM [62.239.224.237]) by ietfa.amsl.com (Postfix) with ESMTP id 96C5B21F8B31 for ; Thu, 18 Aug 2011 03:26:52 -0700 (PDT) Received: from EVMHT63-UKRD.domain1.systemhost.net (10.36.3.100) by RDW083A008ED64.smtp-e4.hygiene.service (10.187.98.13) with Microsoft SMTP Server (TLS) id 8.3.159.2; Thu, 18 Aug 2011 11:27:45 +0100 Received: from EMV65-UKRD.domain1.systemhost.net ([169.254.1.20]) by EVMHT63-UKRD.domain1.systemhost.net ([10.36.3.100]) with mapi; Thu, 18 Aug 2011 11:27:45 +0100 From: To: Date: Thu, 18 Aug 2011 11:27:43 +0100 Thread-Topic: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt Thread-Index: Acxdjrv1eL1QdagKR5+NrBgSX8xvPAAAEffQ Message-ID: <9510D26531EF184D9017DF24659BB87F330AFB92A0@EMV65-UKRD.domain1.systemhost.net> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.domain1.systemhost.net> <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> In-Reply-To: <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, en-GB Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F330AFB92A0EMV65UKRDdoma_" MIME-Version: 1.0 Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 10:26:55 -0000 --_000_9510D26531EF184D9017DF24659BB87F330AFB92A0EMV65UKRDdoma_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable i think it would be helpful to add "The e2e ECN traffic is not treated as PCN-traffic" and "The e2e ECN traffic is treated as PCN-traffic" [BB] Unclear what you are asking for. [phil] i meant: << There are three cases for how e2e ECN traffic may wish to be treated while crossing a PCN domain: a) Does not require admission control: >> A summary of the approach here is (i think) "The e2e ECN traffic is not treated as PCN-traffic" similarly, for b) Requires Admission-control summary is "The e2e ECN traffic is treated as PCN-traffic" << * The PCN-ingress places this traffic in a tunnel with a PCN-compatib= le DSCP in the outer header. The PCN-egress zeroes the ECN-field before de= capsulation. * The PCN-ingress drops CE-marked packets and the PCN-egress zeros t= he ECN field of all PCN packets. >> This can't be quite right, something like * The PCN-ingress places this traffic in a tunnel with, in the outer = header, a PCN-compatible DSCP and the ECN-field set to Not-PCN. The PCN-egress zeroes the (outer) ECN-field befo= re decapsulation. [BB] Surely not. The intention is to preserve the ECN field in the inner, a= nd use PCN in the outer over the PCN domain. Your proposal would prevent PC= N being used. [phil] ok, PCN is applied the e2e ECN traffic (I can't remember why i said = set to Not-PCN). Best wishes phil Philip Eardley Research and Technology Strategy This email contains BT information, which may be privileged or confidential= . It's meant only for the individual(s) or entity named above. If you're no= t the intended recipient, note that disclosing, copying, distributing or us= ing this information is prohibited. If you've received this email in error,= please let me know immediately on the email address above. Thank you. We m= onitor our email system, and may record your emails. British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no: 1800000 From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of Scot= t O Bradner Sent: 31 July 2011 18:38 To: Toby Moncaster Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt sigh - tooooo long a IETF meeting :-) Scott On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: I'm guessing you mean comments by August 15? (otherwise this will be a ~350 day LC!) Toby -----Original Message----- From: pcn-bounces@ietf.org [ mailto:pcn-bounce= s@ietf.org] On Behalf Of Scott O. Bradner Sent: 30 July 2011 20:40 To: pcn@ietf.org Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt comments by July 15 please Scott _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn Scott Bradner Harvard University Information Technology Security | Policy, Risk & Compliance +1 617 495 3864 29 Oxford St., Room 407 Cambridge, MA 02138 www.harvard.edu/huit _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn ________________________________________________________________ Bob Briscoe, BT Innovate & Design --_000_9510D26531EF184D9017DF24659BB87F330AFB92A0EMV65UKRDdoma_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 
i think it would be helpful to a=
dd “The e2e ECN traffic is not
treated as PCN-tr=
affic” and “The e2e ECN traffic is treated as
<= pre>PCN-traffic”


[BB] Unclea= r what you are asking for.

[phil] i me= ant: 

<< There are three case=
s for how e2e ECN traffic may wish to be treated

&nb= sp;  while crossing a PCN domain:

 = ;

   a) Does not require admission control:<= o:p>

>> <= /span>

A summary of the approach here is (i think)  “The e2e ECN traffic is not

= treated as PCN-traffic”

 = ;

similarly, for b) Requires Admission-control
summary is “The e2e ECN traffic is treated as
PCN-traffic”
=
 
 
 
<< =

 
  =
;   *  The PCN-ingress places this traffic in a tunnel with a PCN-compatible DSCP in the outer header.  The PCN-egress zeroes the E=
CN-field before decapsulation.
      *  The PCN-ingress drops<=
span style=3D'color:#1F497D'> CE-marked packets and the PCN-egress z=
eros the ECN field of all PCN packets.=

 
>> 
&nb=
sp;
This can’t be quite right, something like
     *  The PCN-ingress places this tr=
affic in a tunnel with, in the outer h=
eader, a PCN-compatible DSCP and the
ECN-field set to =
Not-PCN.  The PCN-egress zeroes the (outer) ECN-field before decapsulation.

[BB] Surely not. The intention is to preserve the ECN field in the=
 inner, and use PCN in the outer over the PCN domain. Your proposal would p=
revent PCN being used.

[phil] ok, PCN is applied the e2e ECN tr=
affic (I can’t remember why i said set to Not-PCN).=



 
 
=


Best wishes
phil
 Philip Eardley&nbs=
p;  
Research and Technology Strategy

This email =
contains BT information, which may be privileged or confidential. It's mean=
t only for the individual(s) or entity named above. If you're not the inten=
ded recipient, note that disclosing, copying, distributing or using this in=
formation is prohibited. If you've received this email in error, please let=
 me know immediately on the email address above. Thank you. We monitor our =
email system, and may record your emails.
British Telecommunications plc=

Registered office: 81 Newgate Street London EC1A 7AJ
Registered in E=
ngland no: 1800000
 
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Be=
half Of Scott O Bradner
Sent: 31 July 2011 18:38
To: Toby Moncaster
Cc: pcn@ietf.org
Subject: Re: [PCN] WG=
LC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
sigh - tooooo lon=
g a IETF meeting  :-)
 
Scott
 
On Jul 31, 2011,=
 at 6:09 AM, Toby Moncaster wrote:


I'm guessing you mean comment=
s by August 15? (otherwise this will be a ~350
day LC!)

Toby
<=
br>
-----Original Message-----
From: pcn-bounces@ietf.or=
g [ mailto:pcn-bounces@ietf.org=
] On Behalf Of
Scott =
O. Bradner
Sent: 30 July =
2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt=

 
 
this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt=

 
comments by July 15 please
<=
p class=3DMsoNormal style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin=
-bottom:12.0pt;margin-left:36.0pt'> 
Scott
__=
_____________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn
 
 
Scott Bradner
 
Harvar=
d University Information Technology
Security | Policy, Risk & Compli=
ance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138www.harvard.edu/huit
 =
;


 
_______________________________________________
P=
CN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn
<=
p>________________________________________________________________
Bob B=
riscoe,           &n=
bsp;            =
;        BT Innovate & Design
= --_000_9510D26531EF184D9017DF24659BB87F330AFB92A0EMV65UKRDdoma_-- From sob@harvard.edu Thu Aug 18 05:40:00 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5B4A521F8AAC for ; Thu, 18 Aug 2011 05:40:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[AWL=-0.001, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CZ8fbPV4MNap for ; Thu, 18 Aug 2011 05:39:59 -0700 (PDT) Received: from newdev.eecs.harvard.edu (newdev.eecs.harvard.edu [140.247.60.212]) by ietfa.amsl.com (Postfix) with ESMTP id 707B321F8A7A for ; Thu, 18 Aug 2011 05:39:59 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by newdev.eecs.harvard.edu (Postfix) with ESMTP id 108B6E5E7DC; Thu, 18 Aug 2011 08:40:51 -0400 (EDT) Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-2-356601608 From: Scott Bradner In-Reply-To: <201108181016.p7IAGui4021893@bagheera.jungle.bt.co.uk> Date: Thu, 18 Aug 2011 08:40:50 -0400 Message-Id: <96ED2E77-2D20-4FC8-B8D2-782FAFB57374@harvard.edu> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <201108181016.p7IAGui4021893@bagheera.jungle.bt.co.uk> To: Bob Briscoe X-Mailer: Apple Mail (2.1084) Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 12:40:00 -0000 --Apple-Mail-2-356601608 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii please update the ID first tnx Scott On Aug 18, 2011, at 6:17 AM, Bob Briscoe wrote: > Scott, >=20 > Now WGLC is over, we've had two useful reviews from Michael (a = co-author) and Phil with a reasonably large number of editorial changes. >=20 > Assuming the outstanding conversations converge, I don't think there = are any disagreements on the technical effect, or on anything normative. >=20 > I think there's enough editorial changes to warrant a rev before = sending to the IESG. However, if you would rather it goes straight to = the IESG, I wouldn't fight. if I recall correctly none of the requested = changes imply the existing text is completely incomprehensible. >=20 > Your call... >=20 >=20 > Bob >=20 > At 23:38 31/07/2011, Scott O Bradner wrote: >> sigh - tooooo long a IETF meeting :-) >>=20 >> Scott >>=20 >> On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: >>=20 >>> I'm guessing you mean comments by August 15? (otherwise this will be = a ~350 >>> day LC!) >>>=20 >>> Toby >>>=20 >>>> -----Original Message----- >>>> From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf = Of >>>> Scott O. Bradner >>>> Sent: 30 July 2011 20:40 >>>> To: pcn@ietf.org >>>> Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>>>=20 >>>>=20 >>>> this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>>>=20 >>>> comments by July 15 please >>>>=20 >>>> Scott >>>> _______________________________________________ >>>> PCN mailing list >>>> PCN@ietf.org >>>> https://www.ietf.org/mailman/listinfo/pcn >>=20 >> Scott Bradner >>=20 >> Harvard University Information Technology >> Security | Policy, Risk & Compliance >> +1 617 495 3864 >> 29 Oxford St., Room 407 >> Cambridge, MA 02138 >> www.harvard.edu/huit >>=20 >>=20 >>=20 >>=20 >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www.ietf.org/mailman/listinfo/pcn > ________________________________________________________________ > Bob Briscoe, BT Innovate & Design >=20 --Apple-Mail-2-356601608 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii please update the ID first

tnx

Scott

On Aug 18, 2011, at 6:17 AM, Bob Briscoe wrote:

Scott,

Now WGLC is over, we've had two useful reviews from Michael (a co-author) and Phil with a reasonably large number of editorial changes.

Assuming the outstanding conversations converge, I don't think there are any disagreements on the technical effect, or on anything normative.

I think there's enough editorial changes to warrant a rev before sending to the IESG. However, if you would rather it goes straight to the IESG, I wouldn't fight. if I recall correctly none of the requested changes imply the existing text is completely incomprehensible.

Your call...


Bob

At 23:38 31/07/2011, Scott O Bradner wrote:
sigh - tooooo long a IETF meeting  :-)

Scott

On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote:

I'm guessing you mean comments by August 15? (otherwise this will be a ~350
day LC!)

Toby

-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of
Scott O. Bradner
Sent: 30 July 2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt


this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt

comments by July 15 please

Scott
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

Scott Bradner

Harvard University Information Technology
Security | Policy, Risk & Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138
www.harvard.edu/huit




_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

________________________________________________________________
Bob Briscoe,                                BT Innovate & Design


--Apple-Mail-2-356601608-- From bob.briscoe@bt.com Thu Aug 18 07:13:36 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A187021F8B6B for ; Thu, 18 Aug 2011 07:13:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.441 X-Spam-Level: X-Spam-Status: No, score=-3.441 tagged_above=-999 required=5 tests=[AWL=0.157, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GEH4hCijPbZG for ; Thu, 18 Aug 2011 07:13:35 -0700 (PDT) Received: from smtp4.smtp.bt.com (smtp4.smtp.bt.com [217.32.164.151]) by ietfa.amsl.com (Postfix) with ESMTP id 49CFF21F8B6E for ; Thu, 18 Aug 2011 07:13:35 -0700 (PDT) Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 15:14:27 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 15:14:26 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 131367686680; Thu, 18 Aug 2011 15:14:26 +0100 Received: from MUT.jungle.bt.co.uk ([10.215.130.253]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7IEEOrF022792; Thu, 18 Aug 2011 15:14:24 +0100 Message-Id: <201108181414.p7IEEOrF022792@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 15:14:33 +0100 To: Scott Bradner From: Bob Briscoe In-Reply-To: <96ED2E77-2D20-4FC8-B8D2-782FAFB57374@harvard.edu> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <201108181016.p7IAGui4021893@bagheera.jungle.bt.co.uk> <96ED2E77-2D20-4FC8-B8D2-782FAFB57374@harvard.edu> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1023410376==.ALT" X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 14:14:26.0905 (UTC) FILETIME=[23426490:01CC5DB1] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 14:13:36 -0000 --=====================_1023410376==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Scott, OK Bob At 13:40 18/08/2011, Scott Bradner wrote: >please update the ID first > >tnx > >Scott > >On Aug 18, 2011, at 6:17 AM, Bob Briscoe wrote: > >>Scott, >> >>Now WGLC is over, we've had two useful reviews from Michael (a >>co-author) and Phil with a reasonably large number of editorial changes. >> >>Assuming the outstanding conversations converge, I don't think >>there are any disagreements on the technical effect, or on anything normative. >> >>I think there's enough editorial changes to warrant a rev before >>sending to the IESG. However, if you would rather it goes straight >>to the IESG, I wouldn't fight. if I recall correctly none of the >>requested changes imply the existing text is completely incomprehensible. >> >>Your call... >> >> >>Bob >> >>At 23:38 31/07/2011, Scott O Bradner wrote: >>>sigh - tooooo long a IETF meeting :-) >>> >>>Scott >>> >>>On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: >>> >>>>I'm guessing you mean comments by August 15? (otherwise this will be a ~350 >>>>day LC!) >>>> >>>>Toby >>>> >>>>>-----Original Message----- >>>>>From: pcn-bounces@ietf.org [ >>>>>mailto:pcn-bounces@ietf.org] On Behalf Of >>>>>Scott O. Bradner >>>>>Sent: 30 July 2011 20:40 >>>>>To: pcn@ietf.org >>>>>Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>>>> >>>>> >>>>>this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>>>> >>>>>comments by July 15 please >>>>> >>>>>Scott >>>>>_______________________________________________ >>>>>PCN mailing list >>>>>PCN@ietf.org >>>>>https://www.ietf.org/mailman/listinfo/pcn >>> >>>Scott Bradner >>> >>>Harvard University Information Technology >>>Security | Policy, Risk & Compliance >>>+1 617 495 3864 >>>29 Oxford St., Room 407 >>>Cambridge, MA 02138 >>>www.harvard.edu/huit >>> >>> >>> >>> >>>_______________________________________________ >>>PCN mailing list >>>PCN@ietf.org >>>https://www.ietf.org/mailman/listinfo/pcn >> >>________________________________________________________________ >>Bob Briscoe, BT Innovate & Design ________________________________________________________________ Bob Briscoe, BT Innovate & Design --=====================_1023410376==.ALT Content-Type: text/html; charset="us-ascii" Scott,

OK


Bob

At 13:40 18/08/2011, Scott Bradner wrote:
please update the ID first

tnx

Scott

On Aug 18, 2011, at 6:17 AM, Bob Briscoe wrote:

Scott,

Now WGLC is over, we've had two useful reviews from Michael (a co-author) and Phil with a reasonably large number of editorial changes.

Assuming the outstanding conversations converge, I don't think there are any disagreements on the technical effect, or on anything normative.

I think there's enough editorial changes to warrant a rev before sending to the IESG. However, if you would rather it goes straight to the IESG, I wouldn't fight. if I recall correctly none of the requested changes imply the existing text is completely incomprehensible.

Your call...


Bob

At 23:38 31/07/2011, Scott O Bradner wrote:
sigh - tooooo long a IETF meeting  :-)

Scott

On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote:

I'm guessing you mean comments by August 15? (otherwise this will be a ~350
day LC!)

Toby

-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of
Scott O. Bradner
Sent: 30 July 2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt


this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt

comments by July 15 please

Scott
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

Scott Bradner

Harvard University Information Technology
Security | Policy, Risk & Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138
www.harvard.edu/huit




_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

________________________________________________________________
Bob Briscoe,                                BT Innovate & Design

________________________________________________________________
Bob Briscoe,                                BT Innovate & Design --=====================_1023410376==.ALT-- From bob.briscoe@bt.com Thu Aug 18 07:19:00 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1FCA421F8B42 for ; Thu, 18 Aug 2011 07:19:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.295 X-Spam-Level: X-Spam-Status: No, score=-1.295 tagged_above=-999 required=5 tests=[AWL=-1.993, BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_21=0.6, MANGLED_TOOL=2.3, MIME_QP_LONG_LINE=1.396, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L5gGFWfwdpia for ; Thu, 18 Aug 2011 07:18:58 -0700 (PDT) Received: from smtp1.smtp.bt.com (smtp1.smtp.bt.com [217.32.164.137]) by ietfa.amsl.com (Postfix) with ESMTP id F137521F8A23 for ; Thu, 18 Aug 2011 07:18:50 -0700 (PDT) Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 15:19:43 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 15:19:43 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1313677181309; Thu, 18 Aug 2011 15:19:41 +0100 Received: from MUT.jungle.bt.co.uk ([10.215.130.253]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7IEJcJO022821; Thu, 18 Aug 2011 15:19:38 +0100 Message-Id: <201108181419.p7IEJcJO022821@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 15:19:47 +0100 To: Toby Moncaster From: Bob Briscoe In-Reply-To: <00cf01cc5d91$102764c0$30762e40$@com> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.domain1.systemhost.net> <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> <00cf01cc5d91$102764c0$30762e40$@com> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1023725289==.ALT" X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 14:19:43.0253 (UTC) FILETIME=[DFD14450:01CC5DB1] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 14:19:00 -0000 --=====================_1023725289==.ALT Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable Toby, I was just going to offer, when I saw your email. As I have all the edits in foreground memory at the mo, I'll do it now. If you have any pent up edits since -07, pls send=20 the xml. Otherwise I'm going to start from the=20 -07.xml, assuming I can find it on your site (or otherwise the data= tracker). Bob At 11:24 18/08/2011, Toby Moncaster wrote: >Bob, > >Is there any chance you will be able to take=20 >over the pen for a final round of tweaks now the=20 >WGLC is over? I=92m going to be fairly busy over the next few weeks. > >Toby > >From: pcn-bounces@ietf.org=20 >[mailto:pcn-bounces@ietf.org] On Behalf Of Bob Briscoe >Sent: 18 August 2011 11:08 >To: philip.eardley@bt.com >Cc: pcn@ietf.org >Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > >Phil, > >Agree with everything. A few reponses inline.... > >At 10:03 05/08/2011, philip.eardley@bt.com wrote: > >Content-Language: en-US >Content-Type: multipart/alternative; >=20 >boundary=3D"_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_" > >Here are some small comments =96 the doc looks=20 >very good and is ready for IESG i think > >S1 > ><< The baseline encoding defined in > >[RFC5696] described how > >two PCN>> > > >Delete =91baseline=92 =96 just confusing for people in the > >future > > ><< This document extends the baseline encoding by > >redefining the EXP>> > > > This document amends the [RFC5696] encoding by > >redefining the 01 > > >(and a couple of lines earlier where you mention EXP, add that this > >is 01 codepoint) > > > > >S2.1 > ><< Threshold-marked codepoint: a codepoint > >that indicates packets that > > > have been marked at a > >PCN-interior-node as a result of an > > > indication from the > >threshold-metering function > >[RFC5670]. > > > Abbreviated to > >ThM.>> > > >I wonder if this would be clearer as > > > Threshold-marked codepoint: a codepoint that > >indicates a packet has been threshold-marked, that is a packet > >that > > > has been marked at a > >PCN-interior-node as a result of an > > > indication from the > >threshold-metering function > >[RFC5670]. > > > Abbreviated to ThM. > > >[firstly clearer to refer to =91packet=92 than =91packets=92, secondly uses > >the term =91threshold-marked=92 which was defined in 5559] > > >Similarly for excess-traffic-marked codepoint > > ><< Not-marked codepoint: a codepoint that > >indicates PCN-packets but > > > that are not PCN-marked. > >Abbreviated to NM.>> > > >delete =91but=92 > > >S3 > > ><< A PCN-node (i.e. a node within a PCN-domain) will be > >configured to > > > recognise certain DSCPs as PCN-compatible. > > > >Ap= pendix=20 >A discusses the > > > choice of suitable DSCPs. In Figure 1 'DSCP n' > >indicates such a PCN- > > > compatible DSCP. Within the PCN-domain, any > >packet carrying a PCN- > > > compatible DSCP is a PCN-packet as defined in > >[RFC5559].>> > > >A PCN-node (i.e. a node within a PCN-domain) will be configured > >to > > > recognise certain DSCP(s) as PCN-compatible. > > > >Ap= pendix=20 >A discusses the > > > choice of suitable DSCP(s). In Figure 1 'DSCP n' > >indicates such a PCN- > > > compatible DSCP. Within the PCN-domain, any > >packet carrying a PCN- > > > compatible DSCP and with the ECN-field anything other > >than 00 (Not-PCN) is a PCN-packet as defined in > >[RFC5559]. > > >[DSCPs =3D> DSCP(s). And added phrase in last sentence] > > >4.2 > >Delete =93the baseline encoding =93 > > >With =3D> that has [a Not-marked codepoint...] > > >4.3 > > ><< For the full 3-in-1 encoding to apply, any tunnel endpoints >(IP-in-IP > > > and IPsec) within the PCN-domain MUST comply with the > >ECN > > > encapsulation and decapsulation rules set out in > >[RFC6040] > >(see > > > > > > >S= ection=20 >4.2). There is one exception to this rule outlined > >next. > > > >> > > >With one exception (see next paragraph), any tunnel endpoints > >(IP-in-IP > > > and IPsec) within the PCN-domain MUST comply with the > >ECN > > > encapsulation and decapsulation rules set out in > >[RFC6040] > >(see > > > > > > >S= ection=20 >4.2). > > >S5 > > ><< As mentioned in > > > >S= ection=20 >4.3 above, all PCN-nodes MUST comply with > > > > >[RFC6040].>> > > >All PCN-nodes MUST comply with > >[RFC6040]. Since PCN is > >a new capability, this is considered a reasonable requirement. > > >[note that it isn=92t mentioned in > > > >S= ection=20 >4.3 !] > > >S5.2.3 > > ><< Observant readers may spot an apparent > >inconsistency > > > between the two following cases. > > > >Ap= pendix=20 >D explains the rationale > > > behind this inconsistency. > > > >> > > > > > > >Ap= pendix=20 >D explains the rationale for the behaviours defined in this > >section. > > >[i see no reason to worry the average reader with talk of > >inconsistency.] > > >S5.3 > > ><< marking is used it should treat ETM as > >ThM. However it SHOULD raise>> > > > marking is used it SHOULD treat ETM as ThM. > >However it SHOULD raise > > >s6.1 > > ><< PCN-ingress- > > > nodes ensure that any packets entering the PCN-domain > >have the ECN > > > field in their outermost IP header set to the > >appropriate PCN > > > codepoint. > > >> > > >CHANGE TO =93appropriate codepoint=94 (as it may be appropriate to set > >it to 00, which isn=92t a PCN codepoint) > > >6.2 > > >Thre =3D> there > > >10 > > >Criticism is misspelt > > >Appendix A > > >The para =93PCN-marking is intended... > > >It wasn=92t clear to me whether PCN is operating on the whole > >aggregate of classes together, or on each class separately. Or whether > >either is possible. > >[BB] That depends totally on whether the classes=20 >are all treated with the same scheduling=20 >behaviour. If they're all in different queues,=20 >PCN cannot be applied to the aggregate. If=20 >they're all in the same queue, PCN cannot be applied to each class= separately. > > > > > > >App B > > ><< a. flow signalling associates > > >a. flow signalling, which associates > > > > > ><< Interactive Real-Time, > > > Broadcast TV > > >> > > >These have slightly different names in App A > > > > > ><< Figure 2: Separation of tunneling and PCN > >actions > > >=3D> tunnelling > > > > > > a) Does not require admission control: > > > b) Requires Admission-control: > > >i think it would be helpful to add =93The e2e ECN traffic is not > >treated as PCN-traffic=94 and =93The e2e ECN traffic is treated as > >PCN-traffic=94 > >[BB] Unclear what you are asking for. > > > > > > ><< > > > * The PCN-ingress places this traffic > >in a tunnel with a PCN- > > > compatible DSCP in > >the outer header. The PCN-egress zeroes the > > > ECN-field before > >decapsulation. > > > * The PCN-ingress drops > >CE-marked packets and the PCN-egress > > > zeros the ECN field > >of all PCN packets. > > > >> > > >This can=92t be quite right, something like > > > * The PCN-ingress places this traffic >in a tunnel with, in the outer header, a PCN-compatible DSCP and the > >ECN-field set to Not-PCN. The PCN-egress zeroes the > >(outer) ECN-field before decapsulation. > >[BB] Surely not. The intention is to preserve=20 >the ECN field in the inner, and use PCN in the=20 >outer over the PCN domain. Your proposal would prevent PCN being used. > > > > > > > * The PCN-ingress drops CE-marked > >packets and otherwise sets the ECN-field to NM, and sets the DCSP to a > >PCN-compatible DSCP [or requires that it=92s already in such a DSCP??]. The > >PCN-egress zeroes the ECN field of all PCN packets; note this turns off > >e2e ECN. > > >[note, =91zeroes=92] > > >[i=92m not sure about the last bullet, is this what you mean>?] > >[BB] Yes > > > > >You could also correct > >PCN-ingress to PCN-ingress-node throughout the section; ditto > >PCN-egress. > > >< > > ECT(0) into ECT(1), which would not > >be compatible with the > > > (currently experimental) ECN nonce > >[RFC3540].>> > > >Well a PCN-interior-node doesn=92t know about ECT. Change to: > > >Note that a PCN-interior-node may change the ECN-field from 10 to 01 > >(NM to ThM), which would be interpreted by the e2e ECN as a change from > >ECT(0) into ECT(1) =96- hence it would not be compatible with the > >(currently experimental) ECN nonce > >[RFC3540]. > > >App C > > >< >[RFC5129] was written > >while > > > PCN specifications were in early draft > >stages>> > > >The =91But=92 makes it sound like you=92re updating 5129 (i don=92t think > >you are, if i remember right) > >[BB] OK. Delete 'But'. > > > > >ECT(0) -> > >NM > > >Etc (all 6 bullets need to be changed) > > > >After the last bullet you could add > > >=93The above sets of codepoints are required for every PCN-compatible > >DSCP.=94 > >[BB] Yup. > > > > > > >App D > > >In title & , Discrepancy -> Difference > > >Apparent discrepancy -> slight difference > > >(to me, discrepancy implies something is wrong) > >[BB] OK, but no need to say 'slight', given it's a complete reversal. > > > > >< >only threshold marking keeps to the rule that > > > ETM is more severe and must never be > >changed to ThM even though > > > ETM is not a valid marking in this > >case. >> > > >The behaviour with only threshold marking keeps to the rule of > >Section 5.2.1 that > > > ETM is more severe and must never be > >changed to ThM (even though > > > ETM is not a valid marking in this > >case). > > > >First bullet > > >Your argument also means that a ThM should be corrected to ETM > >(since the excess-traffic-metering behaviour depends on ETM marks on > >arriving packets). At the moment it only gets corrected when the meter > >wants to ETM mark the pkt. > > >But making this correction would require different code compared > >with the standard behaviour. > > >Personally i=92d just delete the first bullet. If not, make it the > >second one (as it=92s harder to understand) > >[BB] You're right. I agree we should just remove the first bullet. >And I suggest we add your sentence about=20 >requiring different code at the end of the remaining bullet. > >Thanks > > > >Bob > > > > > > > > > > > > >Best wishes >phil > Philip Eardley >Research and Technology Strategy > >This email contains BT information, which may be=20 >privileged or confidential. It's meant only for=20 >the individual(s) or entity named above. If=20 >you're not the intended recipient, note that=20 >disclosing, copying, distributing or using this=20 >information is prohibited. If you've received=20 >this email in error, please let me know=20 >immediately on the email address above. Thank=20 >you. We monitor our email system, and may record your emails. >British Telecommunications plc >Registered office: 81 Newgate Street London EC1A 7AJ >Registered in England no: 1800000 > >From: pcn-bounces@ietf.org [=20 >mailto:pcn-bounces@ietf.org] On Behalf Of Scott O Bradner >Sent: 31 July 2011 18:38 >To: Toby Moncaster >Cc: pcn@ietf.org >Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > >sigh - tooooo long a IETF meeting :-) > >Scott > >On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: > > >I'm guessing you mean comments by August 15? (otherwise this will be a ~350 >day LC!) > >Toby > > >-----Original Message----- >From:=20 >pcn-bounces@ietf.org=20 > [ mailto:pcn-bounces@ietf.org] On Behalf Of >Scott O. Bradner >Sent: 30 July 2011 20:40 >To: pcn@ietf.org >Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > > >this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt > >comments by July 15 please > >Scott >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www.ietf.org/mailman/listinfo/pcn > > >Scott Bradner > >Harvard University Information Technology >Security | Policy, Risk & Compliance >+1 617 495 3864 >29 Oxford St., Room 407 >Cambridge, MA 02138 >www.harvard.edu/huit > > > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www.ietf.org/mailman/lis= tinfo/pcn > >________________________________________________________________ >Bob Briscoe, BT Innovate & Design ________________________________________________________________ Bob Briscoe, BT Innovate & Design=20 --=====================_1023725289==.ALT Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Toby,

I was just going to offer, when I saw your email.
As I have all the edits in foreground memory at the mo, I'll do it now.

If you have any pent up edits since -07, pls send the xml. Otherwise I'm going to start from the -07.xml, assuming I can find it on your site (or otherwise the data tracker).


Bob

At 11:24 18/08/2011, Toby Moncaster wrote:

Bob,
 
Is there any chance you will be able to take over the pen for a final round of tweaks now the WGLC is over? I=92m going to be fairly busy over the next few weeks.
 
Toby
 
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of Bob Briscoe
Sent: 18 August 2011 11:08
To: philip.eardley@bt.com
Cc: pcn@ietf.org
Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
Phil,

Agree with everything. A few reponses inline....

At 10:03 05/08/2011, philip.eardley@bt.com wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
         boundary=3D"_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdom= a_"

Here are some small comments =96 the doc looks very good and is ready for IESG i think
 
S1

<<   The baseline encoding defined in


[RFC5696] described
how


two PCN>>

 

Delete =91baseline=92 =96 just confusing for people in=
 the


future

 

<<   This document extends the baseline encoding
by


redefining the EXP>>

 

   This document amends the [RFC5696] encoding
by


redefining the 01

 

(and a couple of lines earlier where you mention EXP, add that
this


is 01 codepoint)

 

 


S2.1

<<   Threshold-marked codepoint:  a
codepoint


that indicates packets that

 

      have been marked at a


PCN-interior-node as a result of an

 

      indication from the


threshold-metering function


[RFC5670].

 

      Abbreviated to


ThM.>>

 

I wonder if this would be clearer as

 

   Threshold-marked codepoint:  a codepoint
that


indicates a packet has been threshold-marked, that is a
packet


that

 

      has been marked at a


PCN-interior-node as a result of an

 

      indication from the


threshold-metering function


[RFC5670].

 

      Abbreviated to ThM.

 

[firstly clearer to refer to =91packet=92 than =91packets=92, secondly
uses


the term =91threshold-marked=92 which was defined in 5559]

 

Similarly for excess-traffic-marked codepoint

 

<<   Not-marked codepoint:  a codepoint
that


indicates PCN-packets but

 

      that are not PCN-marked.



Abbreviated to NM.>>

 

delete =91but=92

 

S3

 

<< A PCN-node (i.e. a node within a PCN-domain) will
be


configured to

 

   recognise certain DSCPs as PCN-compatible.






Appendix A discusses the

 

   choice of suitable DSCPs.  In Figure 1 'DSCP
n'


indicates such a PCN-

 

   compatible DSCP.  Within the PCN-domain,
any


packet carrying a PCN-

 

   compatible DSCP is a PCN-packet as defined
in


[RFC5559
].>>

 

A PCN-node (i.e. a node within a PCN-domain) will be
configured


to

 

   recognise certain DSCP(s) as PCN-compatible.






Appendix A discusses the

 

   choice of suitable DSCP(s).  In Figure 1 'DSCP
n'


indicates such a PCN-

 

   compatible DSCP.  Within the PCN-domain,
any


packet carrying a PCN-

 

   compatible DSCP and with the ECN-field anything
other


than 00 (Not-PCN) is a PCN-packet as defined in


[RFC5559].

 

[DSCPs =3D> DSCP(s). And added phrase in last
sentence]


 
4.2

Delete =93the baseline encoding =93

 

With =3D> that has [a Not-marked codepoint...]

 

4.3

 

<< For the full 3-in-1 encoding to apply, any tunnel
endpoints

(IP-in-IP

 

   and IPsec) within the PCN-domain MUST comply with
the


ECN

 

   encapsulation and decapsulation rules set out
in


[RFC6040]


(see

 

  





Section 4.2).  There is one exception to this rule
outlined


next.

 

>>

 

With one exception (see next paragraph), any tunnel
endpoints


(IP-in-IP

 

   and IPsec) within the PCN-domain MUST comply with
the


ECN

 

   encapsulation and decapsulation rules set out
in


[RFC6040]


(see

 

  





Section 4.2). 

 

S5

 

<< As mentioned in





Section 4.3 above, all PCN-nodes MUST comply with

 

  


[RFC6040
].>>

 

All PCN-nodes MUST comply with


[RFC6040]. Since
PCN is


a new capability, this is considered a reasonable
requirement.

 

[note that it isn=92t mentioned in





Section 4.3 !]

 

S5.2.3

 

<< Observant readers may spot an apparent


inconsistency

 

   between the two following cases. 





Appendix D explains the rationale

 

   behind this inconsistency.

 

>>

 

 





Appendix D explains the rationale for the behaviours defined in
this


section.

 

[i see no reason to worry the average reader with talk
of


inconsistency.]

 

S5.3

 

<<   marking is used it should treat ETM
as


ThM.  However it SHOULD raise>>

 

   marking is used it SHOULD treat ETM as ThM.



However it SHOULD raise

 

s6.1

 

<< PCN-ingress-

 

   nodes ensure that any packets entering the
PCN-domain


have the ECN

 

   field in their outermost IP header set to
the


appropriate PCN

 

   codepoint. 


>>           &n=
bsp;            =
           

 

CHANGE TO =93appropriate codepoint=94 (as it may be appropriate to
set


it to 00, which isn=92t a PCN codepoint)

 

6.2

 

Thre =3D> there

 

10

 

Criticism is misspelt

 

Appendix A

 

The para =93PCN-marking is intended...

 

It wasn=92t clear to me whether PCN is operating on the
whole


aggregate of classes together, or on each class separately. Or
whether


either is possible.


[BB] That depends totally on whether the classes are all treated with the same scheduling behaviour. If they're all in different queues, PCN cannot be applied to the aggregate. If they're all in the same queue, PCN cannot be applied to each class separately.



 

 

App B

 

<< a.  flow signalling associates

 

a.  flow signalling, which associates

 

 

 

<< Interactive Real-Time,

 

       Broadcast TV


>>

 

These have slightly different names in App A

 

 

 

<< Figure 2: Separation of tunneling and PCN


actions

 

=3D> tunnelling

 

 

 

   a) Does not require admission control:

 

   b) Requires Admission-control: 

 

i think it would be helpful to add =93The e2e ECN traffic is
not


treated as PCN-traffic=94 and =93The e2e ECN traffic is treated
as


PCN-traffic=94


[BB] Unclear what you are asking for.



 

 

<<

 

     *  The PCN-ingress places this
traffic


in a tunnel with a PCN-

 

         compatible DSCP
in


the outer header.  The PCN-egress zeroes the

 

         ECN-field
before


decapsulation.

 

      *  The PCN-ingress
drops


CE-marked packets and the PCN-egress

 

         zeros the ECN
field


of all PCN packets.

 

>>

 

This can=92t be quite right, something like

 

     *  The PCN-ingress places this
traffic

in a tunnel with, in the outer header, a PCN-compatible DSCP and
the


ECN-field set to Not-PCN.  The PCN-egress zeroes
the


(outer) ECN-field before decapsulation.


[BB] Surely not. The intention is to preserve the ECN field in the inner, and use PCN in the outer over the PCN domain. Your proposal would prevent PCN being used.




 


      *  The PCN-ingress drops
CE-marked


packets and otherwise sets the ECN-field to NM, and sets the DCSP to
a


PCN-compatible DSCP [or requires that it=92s already in such a
DSCP??]. The


PCN-egress zeroes the ECN field of all PCN packets; note this turns
off


e2e ECN.

 

[note, =91zeroes=92]

 

[i=92m not sure about the last bullet, is this what you
mean>?]


[BB] Yes




You could also correct


PCN-ingress to PCN-ingress-node throughout the section;
ditto


PCN-egress.

 

<<Note that a PCN interior node may turn

 

      ECT(0) into ECT(1), which would
not


be compatible with the

 

      (currently experimental) ECN
nonce


[RFC3540
].>>

 

Well a PCN-interior-node doesn=92t know about ECT. Change
to:

 

Note that a PCN-interior-node may change the ECN-field from 10 to
01


(NM to ThM), which would be interpreted by the e2e ECN as a change
from


ECT(0) into ECT(1) =96- hence it would not be compatible with
the


(currently experimental) ECN nonce


[RFC3540].

 

App C

 

<<But


[RFC5129] was
written


while

 

   PCN specifications were in early draft


stages>>

 

The =91But=92 makes it sound like you=92re updating 5129 (i don=92t
think


you are, if i remember right)


[BB] OK. Delete 'But'.




ECT(0) ->


NM

 

Etc (all 6 bullets need to be changed)




After the last bullet you could add

 

=93The above sets of codepoints are required for every
PCN-compatible


DSCP.=94


[BB] Yup.



 

 

App D

 

In title & , Discrepancy -> Difference

 

Apparent discrepancy -> slight difference

 

(to me, discrepancy implies something is wrong)


[BB] OK, but no need to say 'slight', given it's a complete reversal.




<<The behaviour with


only threshold marking keeps to the rule that

 

      ETM is more severe and must never
be


changed to ThM even though

 

      ETM is not a valid marking in
this


case.  >>

 

The behaviour with only threshold marking keeps to the rule
of


Section 5.2.1 that

 

      ETM is more severe and must never
be


changed to ThM (even though

 

      ETM is not a valid marking in
this


case).  




First bullet

 

Your argument also means that a ThM should be corrected to
ETM


(since the excess-traffic-metering behaviour depends on ETM marks
on


arriving packets). At the moment it only gets corrected when the
meter


wants to ETM mark the pkt.

 

But making this correction would require different code
compared


with the standard behaviour.

 

Personally i=92d just delete the first bullet. If not, make it
the


second one (as it=92s harder to understand)


[BB] You're right. I agree we should just remove the first bullet.
And I suggest we add your sentence about requiring different code at the end of the remaining bullet.

Thanks



Bob




 

 

 

 

 


Best wishes
phil
 Philip Eardley  
Research and Technology Strategy

This email contains BT information, which may be privileged or confidential. It's meant only for the individual(s) or entity named above. If you're not the intended recipient, note that disclosing, copying, distributing or using this information is prohibited. If you've received this email in error, please let me know immediately on the email address above. Thank you. We monitor our email system, and may record your emails.
British Telecommunications plc
Registered office: 81 Newgate Street London EC1A 7AJ
Registered in England no: 1800000
 
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of Scott O Bradner
Sent: 31 July 2011 18:38
To: Toby Moncaster
Cc: pcn@ietf.org
Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
sigh - tooooo long a IETF meeting  :-)
 
Scott
 
On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote:


I'm guessing you mean comments by August 15? (otherwise this will be a ~350
day LC!)

Toby


-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of
Scott O. Bradner
Sent: 30 July 2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
 
this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
comments by July 15 please
 
Scott
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn
 
 
Scott Bradner
 
Harvard University Information Technology
Security | Policy, Risk & Compliance
+1 617 495 3864
29 Oxford St., Room 407
Cambridge, MA 02138
www.harvard.edu/huit
 


 
_______________________________________________
PCN mailing list
PCN@ietf.org
https://www.ietf.org/mailman/listinfo/pcn

________________________________________________________________
Bob Briscoe,           &n= bsp;            =         BT Innovate & Design

________________________________________________________________
Bob Briscoe,           &n= bsp;            =         BT Innovate & Design --=====================_1023725289==.ALT-- From bob.briscoe@bt.com Thu Aug 18 07:19:22 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AC01421F8B42 for ; Thu, 18 Aug 2011 07:19:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.414 X-Spam-Level: X-Spam-Status: No, score=-3.414 tagged_above=-999 required=5 tests=[AWL=0.185, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xCaHV9c0SebH for ; Thu, 18 Aug 2011 07:19:22 -0700 (PDT) Received: from smtp4.smtp.bt.com (smtp4.smtp.bt.com [217.32.164.151]) by ietfa.amsl.com (Postfix) with ESMTP id 3D50C21F8B2A for ; Thu, 18 Aug 2011 07:19:21 -0700 (PDT) Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 15:20:14 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 15:20:14 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1313677213401; Thu, 18 Aug 2011 15:20:13 +0100 Received: from MUT.jungle.bt.co.uk ([10.215.130.253]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7IEKBxB022829; Thu, 18 Aug 2011 15:20:12 +0100 Message-Id: <201108181420.p7IEKBxB022829@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 15:20:21 +0100 To: Michael Menth From: Bob Briscoe In-Reply-To: <4E4CE17C.3040705@informatik.uni-tuebingen.de> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <4E3E9F15.9040400@informatik.uni-tuebingen.de> <201108180938.p7I9ctVq021721@bagheera.jungle.bt.co.uk> <4E4CE17C.3040705@informatik.uni-tuebingen.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 14:20:14.0910 (UTC) FILETIME=[F2AFBDE0:01CC5DB1] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 14:19:22 -0000 Michael, Tx Bob At 10:55 18/08/2011, Michael Menth wrote: >Hi Bob, > >the changes are fine with me. > >Best wishes, > > Michael > >Am 18.08.2011 11:34, schrieb Bob Briscoe: >>Michael, >> >>I like nearly all your editorial changes. >> >>In a couple of cases, they have made me notice an even better way >>of saying it. But in the first two cases, I prefer the original to >>your suggestion. I have said why in my annotation of your >>annotations here (mine are in red in the PDF) >> >> >> >> >> >> >>Bob >> >>At 15:20 07/08/2011, Michael Menth wrote: >>>Hi all, >>> >>>I have mostly editorial comments highlighted in the attached Word file. >>> >>>Regards, >>> >>> Michael >>> >>>Am 30.07.2011 21:39, schrieb Scott O. Bradner: >>>>this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>>> >>>>comments by July 15 please >>>> >>>>Scott >>>>_______________________________________________ >>>>PCN mailing list >>>>PCN@ietf.org >>>>https://www.ietf.org/mailman/listinfo/pcn >>> >>> >> >>________________________________________________________________ >>Bob Briscoe, BT Innovate & Design > >-- >Prof. Dr. habil. Michael Menth >University of Tuebingen >Faculty of Science >Department of Computer Science >Chair of Communication Networks >Sand 13, 72076 Tuebingen, Germany >phone: (+49)-7071/29-70505 >fax: (+49)-7071/29-5220 >mailto:menth@uni-tuebingen.de >http://www-kn.informatik.uni-tuebingen.de ________________________________________________________________ Bob Briscoe, BT Innovate & Design From bob.briscoe@bt.com Thu Aug 18 09:51:39 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF54C21F8BE7 for ; Thu, 18 Aug 2011 09:51:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.416 X-Spam-Level: X-Spam-Status: No, score=-3.416 tagged_above=-999 required=5 tests=[AWL=0.183, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0bErwymrQl73 for ; Thu, 18 Aug 2011 09:51:39 -0700 (PDT) Received: from smtp1.smtp.bt.com (smtp1.smtp.bt.com [217.32.164.137]) by ietfa.amsl.com (Postfix) with ESMTP id D54B721F8BDC for ; Thu, 18 Aug 2011 09:51:38 -0700 (PDT) Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 17:52:30 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.4675); Thu, 18 Aug 2011 17:52:30 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1313686349291; Thu, 18 Aug 2011 17:52:29 +0100 Received: from MUT.jungle.bt.co.uk ([10.215.130.253]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id p7IGqSMP023445; Thu, 18 Aug 2011 17:52:28 +0100 Message-Id: <201108181652.p7IGqSMP023445@bagheera.jungle.bt.co.uk> X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 18 Aug 2011 17:51:40 +0100 To: Michael Menth From: Bob Briscoe In-Reply-To: <7.1.0.9.2.20110818152011.065019f8@bt.com> References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <4E3E9F15.9040400@informatik.uni-tuebingen.de> <201108180938.p7I9ctVq021721@bagheera.jungle.bt.co.uk> <4E4CE17C.3040705@informatik.uni-tuebingen.de> <7.1.0.9.2.20110818152011.065019f8@bt.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 18 Aug 2011 16:52:31.0009 (UTC) FILETIME=[3839D110:01CC5DC7] Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 16:51:39 -0000 Michael, While making your changes, I noticed one I had missed in Appx B, case b). BEFORE: "The PCN-ingress-node places this traffic in a tunnel with a PCN-compatible DSCP in the outer header. The PCN-egress zeroes the ECN-field before decapsulation." AFTER: "The PCN-ingress-node places this traffic in a tunnel with a PCN-compatible DSCP in the outer header." I don't understand why you want this last sentence deleted. It seems right to me. Bob At 15:20 18/08/2011, Bob Briscoe wrote: >Michael, > >Tx > > >Bob > >At 10:55 18/08/2011, Michael Menth wrote: >>Hi Bob, >> >>the changes are fine with me. >> >>Best wishes, >> >> Michael >> >>Am 18.08.2011 11:34, schrieb Bob Briscoe: >>>Michael, >>> >>>I like nearly all your editorial changes. >>> >>>In a couple of cases, they have made me notice an even better way >>>of saying it. But in the first two cases, I prefer the original to >>>your suggestion. I have said why in my annotation of your >>>annotations here (mine are in red in the PDF) >>> >>> >>> >>> >>> >>> >>>Bob >>> >>>At 15:20 07/08/2011, Michael Menth wrote: >>>>Hi all, >>>> >>>>I have mostly editorial comments highlighted in the attached Word file. >>>> >>>>Regards, >>>> >>>> Michael >>>> >>>>Am 30.07.2011 21:39, schrieb Scott O. Bradner: >>>>>this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt >>>>> >>>>>comments by July 15 please >>>>> >>>>>Scott >>>>>_______________________________________________ >>>>>PCN mailing list >>>>>PCN@ietf.org >>>>>https://www.ietf.org/mailman/listinfo/pcn >>>> >>> >>>________________________________________________________________ >>>Bob Briscoe, BT Innovate & Design >> >>-- >>Prof. Dr. habil. Michael Menth >>University of Tuebingen >>Faculty of Science >>Department of Computer Science >>Chair of Communication Networks >>Sand 13, 72076 Tuebingen, Germany >>phone: (+49)-7071/29-70505 >>fax: (+49)-7071/29-5220 >>mailto:menth@uni-tuebingen.de >>http://www-kn.informatik.uni-tuebingen.de > >________________________________________________________________ >Bob Briscoe, BT Innovate & Design ________________________________________________________________ Bob Briscoe, BT Innovate & Design From toby@moncaster.com Thu Aug 18 09:53:10 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2A93321F8B02 for ; Thu, 18 Aug 2011 09:53:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.652 X-Spam-Level: X-Spam-Status: No, score=0.652 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_DE=0.35, HTML_MESSAGE=0.001, J_CHICKENPOX_21=0.6, MANGLED_TOOL=2.3] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E1aqYqBVMoaR for ; Thu, 18 Aug 2011 09:53:03 -0700 (PDT) Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.171]) by ietfa.amsl.com (Postfix) with ESMTP id D7B1921F8785 for ; Thu, 18 Aug 2011 09:53:02 -0700 (PDT) Received: from TobysHP (host86-152-89-171.range86-152.btcentralplus.com [86.152.89.171]) by mrelayeu.kundenserver.de (node=mrbap3) with ESMTP (Nemesis) id 0Lwqoy-1RMouX1SdU-016MNW; Thu, 18 Aug 2011 18:53:56 +0200 From: "Toby Moncaster" To: "'Bob Briscoe'" References: <20110730193942.34034D99DE1@newdev.eecs.harvard.edu> <000c01cc4f69$f7d6c670$e7845350$@com> <9510D26531EF184D9017DF24659BB87F32E4B38A1D@EMV65-UKRD.domain1.systemhost.net> <201108181008.p7IA80vG021855@bagheera.jungle.bt.co.uk> <00cf01cc5d91$102764c0$30762e40$@com> <201108181419.p7IEJcJO022821@bagheera.jungle.bt.co.uk> In-Reply-To: <201108181419.p7IEJcJO022821@bagheera.jungle.bt.co.uk> Date: Thu, 18 Aug 2011 17:53:50 +0100 Message-ID: <010b01cc5dc7$683b17c0$38b14740$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_010C_01CC5DCF.C9FF7FC0" X-Mailer: Microsoft Office Outlook 12.0 thread-index: Acxdsd+qwpwTUBuKTa6dTfn8SRhyzwAFIiCQ Content-Language: en-gb X-Provags-ID: V02:K0:O1W3+FWKLLp/8dNZb0/lecF18uUIAkGxFcbRablzXjO R+OnrZ0JPdNmzdPBSbyGIf7YuTz1tONE/gcJGy0lm28SQPadnH rrTDG1raHdEdBnhLXU4/5YSocQbt+CR8uZStv2sON+0hAlWAjx 5H4QN9KnEPhNLOZHRHOYMpnZiUd0NymL+Ks8EqscLNcbl934tJ DyR6ens8KWoQKnPZOUQixkaBUY9OoBFsUfXpmp18+8= Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 16:53:10 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_010C_01CC5DCF.C9FF7FC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I think I uploaded the xml to the datatracker - I certainly intended to. Don't think I had any additional edits, and I agreed with pretty much all you said to Phil about his comments. He is probably right about clarifying the types of traffic we define in the appendix (the bit he had to re-explain to you). Re your comment RJB 1 in your pdf of Michael's edit: we could alter "revert" which may confuse some people to "effectively downgrades the packet to Not Marked", but would be happy to stick with revert if no one else has views. I also agree with your other comment (not accepting Michael's reworked paragraph in 4.3). Toby From: Bob Briscoe [mailto:bob.briscoe@bt.com] Sent: 18 August 2011 15:20 To: Toby Moncaster Cc: philip.eardley@bt.com; pcn@ietf.org Subject: RE: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt Toby, I was just going to offer, when I saw your email. As I have all the edits in foreground memory at the mo, I'll do it now. If you have any pent up edits since -07, pls send the xml. Otherwise I'm going to start from the -07.xml, assuming I can find it on your site (or otherwise the data tracker). Bob At 11:24 18/08/2011, Toby Moncaster wrote: Bob, Is there any chance you will be able to take over the pen for a final round of tweaks now the WGLC is over? I'm going to be fairly busy over the next few weeks. Toby From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org ] On Behalf Of Bob Briscoe Sent: 18 August 2011 11:08 To: philip.eardley@bt.com Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt Phil, Agree with everything. A few reponses inline.... At 10:03 05/08/2011, philip.eardley@bt.com wrote: Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRDdoma_" Here are some small comments - the doc looks very good and is ready for IESG i think S1 << The baseline encoding defined in [RFC5696 ] described how two PCN>> Delete 'baseline' - just confusing for people in the future << This document extends the baseline encoding by redefining the EXP>> This document amends the [RFC5696] encoding by redefining the 01 (and a couple of lines earlier where you mention EXP, add that this is 01 codepoint) S2.1 << Threshold-marked codepoint: a codepoint that indicates packets that have been marked at a PCN-interior-node as a result of an indication from the threshold-metering function [RFC5670 ]. Abbreviated to ThM.>> I wonder if this would be clearer as Threshold-marked codepoint: a codepoint that indicates a packet has been threshold-marked, that is a packet that has been marked at a PCN-interior-node as a result of an indication from the threshold-metering function [RFC5670 ]. Abbreviated to ThM. [firstly clearer to refer to 'packet' than 'packets', secondly uses the term 'threshold-marked' which was defined in 5559] Similarly for excess-traffic-marked codepoint << Not-marked codepoint: a codepoint that indicates PCN-packets but that are not PCN-marked. Abbreviated to NM.>> delete 'but' S3 << A PCN-node (i.e. a node within a PCN-domain) will be configured to recognise certain DSCPs as PCN-compatible. Appendix A discusses the choice of suitable DSCPs. In Figure 1 'DSCP n' indicates such a PCN- compatible DSCP. Within the PCN-domain, any packet carrying a PCN- compatible DSCP is a PCN-packet as defined in [RFC5559 ].>> A PCN-node (i.e. a node within a PCN-domain) will be configured to recognise certain DSCP(s) as PCN-compatible. Appendix A discusses the choice of suitable DSCP(s). In Figure 1 'DSCP n' indicates such a PCN- compatible DSCP. Within the PCN-domain, any packet carrying a PCN- compatible DSCP and with the ECN-field anything other than 00 (Not-PCN) is a PCN-packet as defined in [RFC5559 ]. [DSCPs => DSCP(s). And added phrase in last sentence] 4.2 Delete "the baseline encoding " With => that has [a Not-marked codepoint...] 4.3 << For the full 3-in-1 encoding to apply, any tunnel endpoints (IP-in-IP and IPsec) within the PCN-domain MUST comply with the ECN encapsulation and decapsulation rules set out in [RFC6040 ] (see Section 4.2 ). There is one exception to this rule outlined next. >> With one exception (see next paragraph), any tunnel endpoints (IP-in-IP and IPsec) within the PCN-domain MUST comply with the ECN encapsulation and decapsulation rules set out in [RFC6040 ] (see Section 4.2 ). S5 << As mentioned in Section 4.3 above, all PCN-nodes MUST comply with [RFC6040 ].>> All PCN-nodes MUST comply with [RFC6040 ]. Since PCN is a new capability, this is considered a reasonable requirement. [note that it isn't mentioned in Section 4.3 !] S5.2.3 << Observant readers may spot an apparent inconsistency between the two following cases. Appendix D explains the rationale behind this inconsistency. >> Appendix D explains the rationale for the behaviours defined in this section. [i see no reason to worry the average reader with talk of inconsistency.] S5.3 << marking is used it should treat ETM as ThM. However it SHOULD raise>> marking is used it SHOULD treat ETM as ThM. However it SHOULD raise s6.1 << PCN-ingress- nodes ensure that any packets entering the PCN-domain have the ECN field in their outermost IP header set to the appropriate PCN codepoint. >> CHANGE TO "appropriate codepoint" (as it may be appropriate to set it to 00, which isn't a PCN codepoint) 6.2 Thre => there 10 Criticism is misspelt Appendix A The para "PCN-marking is intended... It wasn't clear to me whether PCN is operating on the whole aggregate of classes together, or on each class separately. Or whether either is possible. [BB] That depends totally on whether the classes are all treated with the same scheduling behaviour. If they're all in different queues, PCN cannot be applied to the aggregate. If they're all in the same queue, PCN cannot be applied to each class separately. App B << a. flow signalling associates a. flow signalling, which associates << Interactive Real-Time, Broadcast TV >> These have slightly different names in App A << Figure 2: Separation of tunneling and PCN actions => tunnelling a) Does not require admission control: b) Requires Admission-control: i think it would be helpful to add "The e2e ECN traffic is not treated as PCN-traffic" and "The e2e ECN traffic is treated as PCN-traffic" [BB] Unclear what you are asking for. << * The PCN-ingress places this traffic in a tunnel with a PCN- compatible DSCP in the outer header. The PCN-egress zeroes the ECN-field before decapsulation. * The PCN-ingress drops CE-marked packets and the PCN-egress zeros the ECN field of all PCN packets. >> This can't be quite right, something like * The PCN-ingress places this traffic in a tunnel with, in the outer header, a PCN-compatible DSCP and the ECN-field set to Not-PCN. The PCN-egress zeroes the (outer) ECN-field before decapsulation. [BB] Surely not. The intention is to preserve the ECN field in the inner, and use PCN in the outer over the PCN domain. Your proposal would prevent PCN being used. * The PCN-ingress drops CE-marked packets and otherwise sets the ECN-field to NM, and sets the DCSP to a PCN-compatible DSCP [or requires that it's already in such a DSCP??]. The PCN-egress zeroes the ECN field of all PCN packets; note this turns off e2e ECN. [note, 'zeroes'] [i'm not sure about the last bullet, is this what you mean>?] [BB] Yes You could also correct PCN-ingress to PCN-ingress-node throughout the section; ditto PCN-egress. < ].>> Well a PCN-interior-node doesn't know about ECT. Change to: Note that a PCN-interior-node may change the ECN-field from 10 to 01 (NM to ThM), which would be interpreted by the e2e ECN as a change from ECT(0) into ECT(1) -- hence it would not be compatible with the (currently experimental) ECN nonce [RFC3540 ]. App C < ] was written while PCN specifications were in early draft stages>> The 'But' makes it sound like you're updating 5129 (i don't think you are, if i remember right) [BB] OK. Delete 'But'. ECT(0) -> NM Etc (all 6 bullets need to be changed) After the last bullet you could add "The above sets of codepoints are required for every PCN-compatible DSCP." [BB] Yup. App D In title & , Discrepancy -> Difference Apparent discrepancy -> slight difference (to me, discrepancy implies something is wrong) [BB] OK, but no need to say 'slight', given it's a complete reversal. <> The behaviour with only threshold marking keeps to the rule of Section 5.2.1 that ETM is more severe and must never be changed to ThM (even though ETM is not a valid marking in this case). First bullet Your argument also means that a ThM should be corrected to ETM (since the excess-traffic-metering behaviour depends on ETM marks on arriving packets). At the moment it only gets corrected when the meter wants to ETM mark the pkt. But making this correction would require different code compared with the standard behaviour. Personally i'd just delete the first bullet. If not, make it the second one (as it's harder to understand) [BB] You're right. I agree we should just remove the first bullet. And I suggest we add your sentence about requiring different code at the end of the remaining bullet. Thanks Bob Best wishes phil Philip Eardley Research and Technology Strategy This email contains BT information, which may be privileged or confidential. It's meant only for the individual(s) or entity named above. If you're not the intended recipient, note that disclosing, copying, distributing or using this information is prohibited. If you've received this email in error, please let me know immediately on the email address above. Thank you. We monitor our email system, and may record your emails. British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no: 1800000 From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of Scott O Bradner Sent: 31 July 2011 18:38 To: Toby Moncaster Cc: pcn@ietf.org Subject: Re: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt sigh - tooooo long a IETF meeting :-) Scott On Jul 31, 2011, at 6:09 AM, Toby Moncaster wrote: I'm guessing you mean comments by August 15? (otherwise this will be a ~350 day LC!) Toby -----Original Message----- From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On Behalf Of Scott O. Bradner Sent: 30 July 2011 20:40 To: pcn@ietf.org Subject: [PCN] WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt this starts a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt comments by July 15 please Scott _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn Scott Bradner Harvard University Information Technology Security | Policy, Risk & Compliance +1 617 495 3864 29 Oxford St., Room 407 Cambridge, MA 02138 www.harvard.edu/huit _______________________________________________ PCN mailing list PCN@ietf.org https://www.ietf.org/mailman/listinfo/pcn ________________________________________________________________ Bob Briscoe, BT Innovate & Design ________________________________________________________________ Bob Briscoe, BT Innovate & Design ------=_NextPart_000_010C_01CC5DCF.C9FF7FC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I think I uploaded the xml to the datatracker – I certainly = intended to.

 

Don’t think I had any additional edits, and I agreed with = pretty much all you said to Phil about his comments. He is probably = right about clarifying the types of traffic we define in the appendix = (the bit he had to re-explain to you).

 

Re your comment RJB 1 in your pdf of Michael’s edit: we could = alter “revert” which may confuse some people to = “effectively downgrades the packet to Not Marked”, but would = be happy to stick with revert if no one else has = views.

 

I also agree with your other comment (not accepting Michael’s = reworked paragraph in 4.3).

 

Toby

 

From:= Bob = Briscoe [mailto:bob.briscoe@bt.com]
Sent: 18 August 2011 = 15:20
To: Toby Moncaster
Cc: philip.eardley@bt.com; = pcn@ietf.org
Subject: RE: [PCN] WGLC for = draft-ietf-pcn-3-in-1-encoding-07.txt

 

Toby,

I was just going to offer, when I saw = your email.
As I have all the edits in foreground memory at the mo, = I'll do it now.

If you have any pent up edits since -07, pls send = the xml. Otherwise I'm going to start from the -07.xml, assuming I can = find it on your site (or otherwise the data = tracker).


Bob

At 11:24 18/08/2011, Toby Moncaster = wrote:

Bob,
 
Is there any chance you = will be able to take over the pen for a final round of tweaks now the = WGLC is over? I’m going to be fairly busy over the next few = weeks.
 
Toby
 
From: pcn-bounces@ietf.org = [ = mailto:pcn-bounces@ietf.org] On Behalf Of Bob = Briscoe
Sent: 18 August 2011 11:08
To: = philip.eardley@bt.com
Cc: pcn@ietf.org
Subject: Re: = [PCN] WGLC for = draft-ietf-pcn-3-in-1-encoding-07.txt
 
Phil,

Agree = with everything. A few reponses inline....

At 10:03 05/08/2011, = philip.eardley@bt.com wrote:

Content-Language: = en-US
Content-Type: = multipart/alternative;
        = ; = boundary=3D"_000_9510D26531EF184D9017DF24659BB87F32E4B38A1DEMV65UKRD= doma_"

Here are some small comments = – the doc looks very good and is ready for IESG i = think
 
S1

<<   The =
baseline encoding defined in

 

[RFC5696] =
described
how

 

two =
PCN>>


 

Delete =
‘baseline’ – just confusing for people in =
the

 

future


 

<<&nbs=
p;  This document extends the baseline =
encoding
by

 

redefining the =
EXP>>


 

  =
 This document amends the [RFC5696] =
encoding
by

 

redefining the =
01


 

(and a =
couple of lines earlier where you mention EXP, add =
that
this

 

is 01 =
codepoint)


 

 <=
/o:p>



S2.1

<<&n=
bsp;  Threshold-marked codepoint:  =
a
codepoint

 

that indicates =
packets that


 

  =
    have been marked at a

 

PCN-interior-nod=
e as a result of an


 

  =
    indication from the

 

threshold-meteri=
ng function

 

[RFC5670].

 
  =
    Abbreviated to
 
ThM.>>

 
I wonder if =
this would be clearer as

 
  =
 Threshold-marked codepoint:  a =
codepoint
that
 
indicates a =
packet has been threshold-marked, that is =
a
packet
 
that<=
/pre>

 
  =
    has been marked at a
 
PCN-interior-nod=
e as a result of an

 
  =
    indication from the
 
threshold-meteri=
ng function
 
[RFC5670].

 
  =
    Abbreviated to ThM.

 
[firstly =
clearer to refer to ‘packet’ than ‘packets’, =
secondly
uses
 
the term =
‘threshold-marked’ which was defined in =
5559]

 
Similarly =
for excess-traffic-marked codepoint

 
<<&nbs=
p;  Not-marked codepoint:  a =
codepoint
that
 
indicates =
PCN-packets but

 
  =
    that are not PCN-marked.
 
Abbreviated to =
NM.>>

 
delete =
‘but’

 
S3

 
<< A =
PCN-node (i.e. a node within a PCN-domain) =
will
be
 
configured =
to

 
  =
 recognise certain DSCPs as PCN-compatible.



 =
;
Appendix A discusses the

 
  =
 choice of suitable DSCPs.  In Figure 1 =
'DSCP
n'
 
indicates such =
a PCN-

 
  =
 compatible DSCP.  Within the =
PCN-domain,
any
 
packet carrying =
a PCN-

 
  =
 compatible DSCP is a PCN-packet as =
defined
in
 
[RFC5559
<=
pre>].>>

 
A PCN-node =
(i.e. a node within a PCN-domain) will =
be
configured
 
to

 
  =
 recognise certain DSCP(s) as PCN-compatible.



 =
;
Appendix A discusses the

 
  =
 choice of suitable DSCP(s).  In Figure 1 =
'DSCP
n'
 
indicates such =
a PCN-

 
  =
 compatible DSCP.  Within the =
PCN-domain,
any
 
packet carrying =
a PCN-

 
  =
 compatible DSCP and with the ECN-field =
anything
other
 
than 00 =
(Not-PCN) is a PCN-packet as defined in
 
[RFC5559].

 
[DSCPs =
=3D> DSCP(s). And added phrase in =
last
sentence]


 
4.2
D=
elete “the baseline encoding “

 
With =
=3D> that has [a Not-marked codepoint...]

 
4.3

 
<< =
For the full 3-in-1 encoding to apply, any =
tunnel
endpoints
 
(IP-in-IP

 
  =
 and IPsec) within the PCN-domain MUST comply =
with
the
 
ECN

 
  =
 encapsulation and decapsulation rules set =
out
in
 
[RFC6040]
=

 
(see<=
/pre>

 
  =




 =
;
Section 4.2).  There is one exception to this =
rule
outlined
 
next.=


 
>> =


 
With one =
exception (see next paragraph), any =
tunnel
endpoints
 
(IP-in-IP

 
  =
 and IPsec) within the PCN-domain MUST comply =
with
the
 
ECN

 
  =
 encapsulation and decapsulation rules set =
out
in
 
[RFC6040]
=

 
(see<=
/pre>

 
  =




 =
;
Section 4.2).  

 
S5

 
<< As =
mentioned in



 =
;
Section 4.3 above, all PCN-nodes MUST comply =
with

 
  =

 
[RFC6040
<=
pre>].>>

 
All =
PCN-nodes MUST comply with
 
[RFC6040]. =
Since
PCN is
 
a new =
capability, this is considered a =
reasonable
requirement.

 
[note that =
it isn’t mentioned in



 =
;
Section 4.3 !]

 
S5.2.3<=
/o:p>

 
<< =
Observant readers may spot an apparent
 
inconsistency

 
  =
 between the two following cases. 



 =
;
Appendix D explains the rationale

 
  =
 behind this inconsistency.

 
>> =


 
 <=
/o:p>



 =
;
Appendix D explains the rationale for the behaviours =
defined in
this
 
section.

 
[i see no =
reason to worry the average reader with =
talk
of
 
inconsistency.]<=
o:p>

 
S5.3

 
<<&nbs=
p;  marking is used it should treat =
ETM
as
 
ThM.  =
However it SHOULD raise>>

 
  =
 marking is used it SHOULD treat ETM as ThM.
 
However it =
SHOULD raise

 
s6.1

 
<< =
PCN-ingress-

 
  =
 nodes ensure that any packets entering =
the
PCN-domain
 
have the =
ECN

 
  =
 field in their outermost IP header set =
to
the
 
appropriate =
PCN

 
  =
 codepoint. 
 
 
>>         =
;            =
            &=
nbsp; 

 
CHANGE TO =
“appropriate codepoint” (as it may be appropriate =
to
set
 
it to 00, which =
isn’t a PCN codepoint)

 
6.2

 
Thre =
=3D> there

 
10

 
Criticism =
is misspelt 

 
Appendix =
A

 
The para =
“PCN-marking is intended...

 
It =
wasn’t clear to me whether PCN is operating on =
the
whole
 
aggregate of =
classes together, or on each class separately. =
Or
whether
 
either is =
possible.


[BB] That depends totally on =
whether the classes are all treated with the same scheduling behaviour. =
If they're all in different queues, PCN cannot be applied to the =
aggregate. If they're all in the same queue, PCN cannot be applied to =
each class =
separately.


 

 
App =
B

 
<< =
a.  flow signalling associates

 
a.  =
flow signalling, which associates

 
 <=
/o:p>

 
<< =
Interactive Real-Time,

 
  =
     Broadcast TV
 
>> =


 
These have =
slightly different names in App A

 
 <=
/o:p>

 
<< =
Figure 2: Separation of tunneling and PCN
 
actions

 
=3D> =
tunnelling

 
 <=
/o:p>

 
  =
 a) Does not require admission control:

 
  =
 b) Requires Admission-control:  

 
i think it =
would be helpful to add “The e2e ECN traffic =
is
not
 
treated as =
PCN-traffic” and “The e2e ECN traffic is =
treated
as
 
PCN-traffic̶=
1;


[BB] Unclear what you are asking =
for.


 

 
<< =


 
  =
   *  The PCN-ingress places =
this
traffic
 
in a tunnel =
with a PCN-

 
  =
       compatible =
DSCP
in
 
the outer =
header.  The PCN-egress zeroes the

 
  =
       =
ECN-field
before
 
decapsulation.

 
  =
    *  The =
PCN-ingress
drops
 
CE-marked =
packets and the PCN-egress

 
  =
       zeros the =
ECN
field
 
of all PCN =
packets.

 
>> =


 
This =
can’t be quite right, something like

 
  =
   *  The PCN-ingress places =
this
traffic
 
in a tunnel with, in the =
outer header, a PCN-compatible DSCP =
and
the
 
ECN-field set =
to Not-PCN.  The PCN-egress =
zeroes
the
 
(outer) =
ECN-field before decapsulation.


[BB] Surely not. The intention is =
to preserve the ECN field in the inner, and use PCN in the outer over =
the PCN domain. Your proposal would prevent PCN being =
used.



 
 
  &nbs=
p;   *  The PCN-ingress =
drops
CE-marked
 
packets and =
otherwise sets the ECN-field to NM, and sets the DCSP =
to
a
 
PCN-compatible =
DSCP [or requires that it’s already in such =
a
DSCP??]. The
 
PCN-egress =
zeroes the ECN field of all PCN packets; note this =
turns
off
 
e2e =
ECN.

 
[note, =
‘zeroes’]

 
[i’m =
not sure about the last bullet, is this what =
you
mean>?]


[BB] =
Yes



You could also =
correct
 
PCN-ingress to =
PCN-ingress-node throughout the =
section;
ditto
 
PCN-egress.=


 
<<Note=
 that a PCN interior node may turn

 
  =
    ECT(0) into ECT(1), which =
would
not
 
be compatible =
with the

 
  =
    (currently experimental) =
ECN
nonce
 
[RFC3540
<=
pre>].>>

 
Well a =
PCN-interior-node doesn’t know about ECT. =
Change
to:

 
Note that a =
PCN-interior-node may change the ECN-field from 10 =
to
01
 
(NM to ThM), =
which would be interpreted by the e2e ECN as a =
change
from
 
ECT(0) into =
ECT(1) –- hence it would not be compatible =
with
the
 
(currently =
experimental) ECN nonce
 
[RFC3540].

 
App =
C

 
<<But<=
o:p>
 
[RFC5129] =
was
written
 
while=


 
  =
 PCN specifications were in early draft
 
stages>>

 
The =
‘But’ makes it sound like you’re updating 5129 (i =
don’t
think
 
you are, if i =
remember right)


[BB] OK. Delete =
'But'.



ECT(0) =
->
 
NM

 
Etc (all 6 =
bullets need to be changed)



After the =
last bullet you could add

 
“The =
above sets of codepoints are required for =
every
PCN-compatible
 
DSCP.”


[BB] =
Yup.


 

 
App =
D

 
In title =
& , Discrepancy -> Difference

 
Apparent =
discrepancy -> slight difference

 
(to me, =
discrepancy implies something is wrong)


[BB] OK, but no =
need to say 'slight', given it's a complete =
reversal.



<<The behaviour =
with
 
only threshold =
marking keeps to the rule that

 
  =
    ETM is more severe and must =
never
be
 
changed to ThM =
even though

 
  =
    ETM is not a valid marking =
in
this
 
case.  =
>>

 
The =
behaviour with only threshold marking keeps to the =
rule
of
 
Section 5.2.1 =
that

 
  =
    ETM is more severe and must =
never
be
 
changed to ThM =
(even though

 
  =
    ETM is not a valid marking =
in
this
 
case).  =




First =
bullet

 
Your =
argument also means that a ThM should be corrected =
to
ETM
 
(since the =
excess-traffic-metering behaviour depends on ETM =
marks
on
 
arriving =
packets). At the moment it only gets corrected when =
the
meter
 
wants to ETM =
mark the pkt. 

 
But making =
this correction would require different =
code
compared
 
with the =
standard behaviour.

 
Personally =
i’d just delete the first bullet. If not, make =
it
the
 
second one (as =
it’s harder to understand)


[BB] You're right. I agree we =
should just remove the first bullet.
And I suggest we add your =
sentence about requiring different code at the end of the remaining =
bullet.

Thanks



Bob



 

 
 <=
/o:p>

 
 <=
/o:p>


Best =
wishes
phil
 Philip Eardley   =

Research and Technology Strategy

This email =
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From: =
pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] =
On Behalf Of Scott O Bradner
Sent: 31 July 2011 =
18:38
To: Toby Moncaster
Cc: =
pcn@ietf.org
Subject: Re: [PCN] WGLC for =
draft-ietf-pcn-3-in-1-encoding-07.txt
 
sigh - tooooo long a =
IETF meeting  :-)
 
Scott
 
On Jul 31, 2011, =
at 6:09 AM, Toby Moncaster wrote:


I'm guessing you mean =
comments by August 15? (otherwise this will be a ~350
day =
LC!)

Toby


-----Original Message-----
From: pcn-bounces@ietf.org [ mailto:pcn-bounces@ietf.org] On =
Behalf Of
Scott O. Bradner
Sent: 30 July 2011 20:40
To: pcn@ietf.org
Subject: [PCN] WGLC for =
draft-ietf-pcn-3-in-1-encoding-07.txt
 
 
this starts =
a WGLC for draft-ietf-pcn-3-in-1-encoding-07.txt
 
comments =
by July 15 =
please
 
Scott
____________________________________________=
___
PCN mailing list
PCN@ietf.org
https://www.ietf.org/m=
ailman/listinfo/pcn
 
 
Scott =
Bradner
 
Harvard University Information =
Technology
Security | Policy, Risk & Compliance
+1 617 495 =
3864
29 Oxford St., Room 407
Cambridge, MA 02138
www.harvard.edu/huit
 

 
_______________________________________________
PC=
N mailing list
PCN@ietf.org
https://www.ietf.org/m=
ailman/listinfo/pcn

__________________________________________=
______________________
Bob =
Briscoe,           =
;            =
         BT Innovate & =
Design
_________________________________________________=
_______________
Bob =
Briscoe,           =
;            =
         BT Innovate & =
Design
------=_NextPart_000_010C_01CC5DCF.C9FF7FC0-- From internet-drafts@ietf.org Thu Aug 18 11:50:06 2011 Return-Path: X-Original-To: pcn@ietfa.amsl.com Delivered-To: pcn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ED11E21F8B56; Thu, 18 Aug 2011 11:50:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.571 X-Spam-Level: X-Spam-Status: No, score=-102.571 tagged_above=-999 required=5 tests=[AWL=0.028, BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aNV4raVPrxWt; Thu, 18 Aug 2011 11:50:05 -0700 (PDT) Received: from ietfa.amsl.com (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 290FD21F8B34; Thu, 18 Aug 2011 11:50:05 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: internet-drafts@ietf.org To: i-d-announce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 3.58 Message-ID: <20110818185005.17017.60775.idtracker@ietfa.amsl.com> Date: Thu, 18 Aug 2011 11:50:05 -0700 Cc: pcn@ietf.org Subject: [PCN] I-D Action: draft-ietf-pcn-3-in-1-encoding-08.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Aug 2011 18:50:06 -0000 A New Internet-Draft is available from the on-line Internet-Drafts director= ies. This draft is a work item of the Congestion and Pre-Congestion Notific= ation Working Group of the IETF. Title : Encoding 3 PCN-States in the IP header using a single DS= CP Author(s) : Bob Briscoe Toby Moncaster Michael Menth Filename : draft-ietf-pcn-3-in-1-encoding-08.txt Pages : 23 Date : 2011-08-18 The objective of Pre-Congestion Notification (PCN) is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. The overall rate of the PCN-traffic is metered on every link in the PCN domain, and PCN-packets are appropriately marked when certain configured rates are exceeded. Egress nodes pass information about these PCN-marks to decision points which then decide whether to admit or block new flow requests or to terminate some already-admitted flows during serious pre-congestion. This document specifies how PCN-marks are to be encoded into the IP header by re-using the Explicit Congestion Notification (ECN) codepoints within a PCN-domain. This encoding provides for up to three different PCN marking states using a single DSCP: not-marked (NM), threshold-marked (ThM) and excess-traffic-marked (ETM). Hence, it is called the 3-in-1 PCN encoding. This document obsoletes RFC5696. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-pcn-3-in-1-encoding-08.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ This Internet-Draft can be retrieved at: ftp://ftp.ietf.org/internet-drafts/draft-ietf-pcn-3-in-1-encoding-08.txt