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Date: Fri, 30 Jun 2023 10:48:42 +0800
From: "Peng Liu" <liupengyjy@chinamobile.com>
To: liyizhou <liyizhou@huawei.com>
Cc: david.black <david.black@dell.com>, detnet <detnet@ietf.org>, 
 ryoo <ryoo@etri.re.kr>
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Subject: Re: [Detnet] suggested text revision to
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3DUTF-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-botto=
m: 0px; }div.FoxDiv20230630095329361678 { }body { font-size: 14px; font-fa=
mily: "Microsoft YaHei UI"; color: rgb(0, 0, 0); line-height: 1.5; }</styl=
e></head><body>=0A<!--[if gte mso 9]><xml>=0A<o:shapedefaults v:ext=3D"edi=
t" spidmax=3D"1026" ></o:shapedefaults>=0A</xml><![endif]--><!--[if gte ms=
o 9]><xml>=0A<o:shapelayout v:ext=3D"edit">=0A<o:idmap v:ext=3D"edit" data=
=3D"1" ></o:idmap>=0A</o:shapelayout></xml><![endif]-->=0A<div><font face=
=3D"Microsoft YaHei"><span></span>Hi Yizhou,</font></div><div><font face=
=3D"Microsoft YaHei"><br></font></div><div><font face=3D"Microsoft YaHei">=
Thank you. I have been working on the issues of this section to address th=
e comments of traffic class.&nbsp;</font></div><div><font face=3D"Microsof=
t YaHei"><span style=3D"background-color: transparent;">Considering your t=
ext, I propose to change Section 3.4 as follows(most of them are in the&nb=
sp;</span><span style=3D"background-color: transparent;">second paragraph<=
/span><span style=3D"background-color: transparent;">):</span></font></div=
><div><font face=3D"Microsoft YaHei"><br></font></div><div><font face=3D"M=
icrosoft YaHei">OLD:</font></div><div><font face=3D"Microsoft YaHei"><br><=
/font></div><div><pre style=3D"box-sizing: border-box; margin-top: 0px; ma=
rgin-bottom: 0px; overflow: auto; white-space: pre-wrap; color: rgb(33, 37=
, 41);"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">   The d=
eterministic network may have the large number of traffic flows.=0A   Acco=
rding to [RFC2475], per-flow state identification in the network=0A   beco=
mes infeasible as flow count scales up.  So, it is almost=0A   impossible =
to identify individual IP flows at the DetNet data plane=0A   for a massiv=
e number of flows.=0A   DetNet allows the leverage of the flow aggregation=
, while individual=0A   flows may join and exit the aggregated flow rapidl=
y in the scaling=0A   network with large number of flows, which causes the=
 dynamic in=0A   identification of the aggregated DetNet flow.  The wildca=
rds and=0A   value ranges used in the identification may have to change in=
 order=0A   to ensure the aggregated flows have compatible deterministic=
=0A   characteristics.  Moreover, for scaling network, proper provision at=
=0A   the control plane to accommodate such higher aggregation is required=
.=0A   The deterministic latency forwarding mechanisms MUST scale to=0A   =
networks of significant size with the massive traffic flows.</font></pre><=
/div><div><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;"><br></=
font></div><div><pre style=3D"box-sizing: border-box; margin-top: 0px; mar=
gin-bottom: 0px; overflow: auto; white-space: pre-wrap; color: rgb(33, 37,=
 41);"><div><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left=
: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-=
size: 12px;">&nbsp; &nbsp;Meanwhile, the traffic that requires determinist=
ic networking can</font></p><p class=3D"MsoNormal" style=3D"margin-right: =
0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei=
" style=3D"font-size: 12px;">&nbsp; &nbsp;significantly fill up the capaci=
ty of a link or the portion of the</font></p><p class=3D"MsoNormal" style=
=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font face=
=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;link which is=
 dedicated to such traffic, for example, more than 75%</font></p><p class=
=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: j=
ustify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; =
&nbsp;and/or up to near 100% utilization.&nbsp; The over-provisioning of l=
ink</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-le=
ft: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"fon=
t-size: 12px;">&nbsp; &nbsp;capacity does not work in such cases.&nbsp; In=
 order to guarantee</font></p><p class=3D"MsoNormal" style=3D"margin-right=
: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft YaH=
ei" style=3D"font-size: 12px;">&nbsp; &nbsp;deterministic latency and jitt=
er in this environment, it is required</font></p><p class=3D"MsoNormal" st=
yle=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font fa=
ce=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;to provide =
scalable queuing solutions to improve the bandwidth</font></p><p class=3D"=
MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: justi=
fy;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbs=
p;utilization.&nbsp; For instance, when the bandwithd utilization is high,=
</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left:=
 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-s=
ize: 12px;">&nbsp; &nbsp;the guard band in each cycle in [IEEE802.1Qch] is=
 a type of over-</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0=
pt; margin-left: 0pt; text-align: justify;"></p><p class=3D"MsoNormal" sty=
le=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font fac=
e=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;provisioning=
 and can be improved with more scalable queuing add-ons.</font></p></div><=
div><br style=3D"color: rgb(0, 0, 0); font-family: &quot;Microsoft YaHei U=
I&quot;; white-space: normal;"></div></pre></div><div><font face=3D"Micros=
oft YaHei"><br></font></div><div><font face=3D"Microsoft YaHei"><br></font=
></div><div><font face=3D"Microsoft YaHei">NEW:</font></div><div><font fac=
e=3D"Microsoft YaHei"><br></font></div><div><p class=3D"MsoNormal" style=
=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font face=
=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;The determini=
stic network may have the large number of traffic flows.</font></p><p clas=
s=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: =
justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp;=
 &nbsp;According to [RFC2475], per-flow state identification in the networ=
k</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left=
: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-=
size: 12px;">&nbsp; &nbsp;becomes infeasible as flow count scales up.&nbsp=
; So, it is almost</font></p><p class=3D"MsoNormal" style=3D"margin-right:=
 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHe=
i" style=3D"font-size: 12px;">&nbsp; &nbsp;impossible to identify individu=
al IP flows at the DetNet data plane</font></p><p class=3D"MsoNormal" styl=
e=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font face=
=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;for a massive=
 number of flows, neither for the per-node state machine</font></p><p clas=
s=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: =
justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp;=
 &nbsp;configuration.&nbsp; DetNet allows the leverage of the flow aggrega=
tion,</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-=
left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"f=
ont-size: 12px;">&nbsp; &nbsp;while individual flows may join and exit the=
 aggregated flow rapidly</font></p><p class=3D"MsoNormal" style=3D"margin-=
right: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsof=
t YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;in the scaling network wi=
th large number of flows, which causes the</font></p><p class=3D"MsoNormal=
" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><fon=
t face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;dynamic=
 in identification of the aggregated DetNet flow.&nbsp; The</font></p><p c=
lass=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-alig=
n: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nb=
sp; &nbsp;wildcards and value ranges used in the identification may have t=
o</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left=
: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-=
size: 12px;">&nbsp; &nbsp;change in order to ensure the aggregated flows h=
ave compatible</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt=
; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" s=
tyle=3D"font-size: 12px;">&nbsp; &nbsp;deterministic characteristics.</fon=
t></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt;=
 text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: =
12px;"><br></font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; m=
argin-left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" styl=
e=3D"font-size: 12px;">&nbsp; &nbsp;For scaling network, proper provision =
at the control plane to</font></p><p class=3D"MsoNormal" style=3D"margin-r=
ight: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft=
 YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;accommodate such higher ag=
gregation is required.&nbsp; Provisioning on the</font></p><p class=3D"Mso=
Normal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;=
"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;a=
ggregated flows normally improve the scalability at the cost of</font></p>=
<p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-=
align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;"=
>&nbsp; &nbsp;coarse granularity of the incoming traffic filtering and pro=
tection.</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; marg=
in-left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=
=3D"font-size: 12px;">&nbsp; &nbsp;It is desirable that adding a flow to t=
he network does not affect the</font></p><p class=3D"MsoNormal" style=3D"m=
argin-right: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Mi=
crosoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;latency of the exis=
ting flows, or requires the complex re-</font></p><p class=3D"MsoNormal" s=
tyle=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font f=
ace=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;calculatio=
n, it should require as less work as possible.&nbsp; For</font></p><p clas=
s=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: =
justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp;=
 &nbsp;instance, only the filtering and policing configuration on the</fon=
t></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt;=
 text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: =
12px;">&nbsp; &nbsp;ingress node but not the intermediate nodes.&nbsp; The=
 [IEEE802.1Qbv] uses</font></p><p class=3D"MsoNormal" style=3D"margin-righ=
t: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft Ya=
Hei" style=3D"font-size: 12px;">&nbsp; &nbsp;traffic class to divide the f=
lows and the number of it is usually 8,</font></p><p class=3D"MsoNormal" s=
tyle=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font f=
ace=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;so that th=
e forwarding mechanisms itself isn't complex with a large</font></p><p cla=
ss=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align:=
 justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp=
; &nbsp;number of flows or higher aggregation.&nbsp; However, when adding =
new</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-le=
ft: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"fon=
t-size: 12px;">&nbsp; &nbsp;flows, the Gate Control List may be changed, a=
nd the re-calculation</font></p><p class=3D"MsoNormal" style=3D"margin-rig=
ht: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft Y=
aHei" style=3D"font-size: 12px;">&nbsp; &nbsp;is complex.&nbsp; There migh=
t be the method to simplify the calculation or</font></p><p class=3D"MsoNo=
rmal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;">=
<font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;con=
figuration, which need more work to enhance it.</font></p><p class=3D"MsoN=
ormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"=
><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;"><br></font></p>=
<p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-=
align: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;"=
>&nbsp; &nbsp;Meanwhile, the traffic that requires deterministic networkin=
g can</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-=
left: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"f=
ont-size: 12px;">&nbsp; &nbsp;significantly fill up the capacity of a link=
 or the portion of the</font></p><p class=3D"MsoNormal" style=3D"margin-ri=
ght: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft =
YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;link which is dedicated to =
such traffic, for example, more than 75%</font></p><p class=3D"MsoNormal" =
style=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font =
face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;and/or up=
 to near 100% utilization.&nbsp; The over-provisioning of link</font></p><=
p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-a=
lign: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">=
&nbsp; &nbsp;capacity does not work in such cases.&nbsp; In order to guara=
ntee</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-l=
eft: 0pt; text-align: justify;"><font face=3D"Microsoft YaHei" style=3D"fo=
nt-size: 12px;">&nbsp; &nbsp;deterministic latency and jitter in this envi=
ronment, it is required</font></p><p class=3D"MsoNormal" style=3D"margin-r=
ight: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft=
 YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;to provide scalable queuin=
g solutions to improve the bandwidth</font></p><p class=3D"MsoNormal" styl=
e=3D"margin-right: 0pt; margin-left: 0pt; text-align: justify;"><font face=
=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;utilization.&=
nbsp; For instance, when the bandwithd utilization is high,</font></p><p c=
lass=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left: 0pt; text-alig=
n: justify;"><font face=3D"Microsoft YaHei" style=3D"font-size: 12px;">&nb=
sp; &nbsp;the guard band in each cycle in [IEEE802.1Qch] is a type of over=
-</font></p><p class=3D"MsoNormal" style=3D"margin-right: 0pt; margin-left=
: 0pt; text-align: justify;"></p><p class=3D"MsoNormal" style=3D"margin-ri=
ght: 0pt; margin-left: 0pt; text-align: justify;"><font face=3D"Microsoft =
YaHei" style=3D"font-size: 12px;">&nbsp; &nbsp;provisioning and can be imp=
roved with more scalable queuing add-ons.</font></p></div>=0A<div><br></di=
v><div>Regards,</div><div>Peng</div><hr style=3D"width: 210px; height: 1px=
;" color=3D"#b5c4df" size=3D"1" align=3D"left">=0A<div><span><div style=3D=
"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><div>liupengyjy@chin=
amobile.com</div></div></span></div>=0A<blockquote style=3D"margin-Top: 0p=
x; margin-Bottom: 0px; margin-Left: 0.5em; margin-Right: inherit"><div>&nb=
sp;</div><div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:=
3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FO=
NT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDI=
NG-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp;<a href=3D"mailto=
:liyizhou=3D40huawei.com@dmarc.ietf.org" style=3D"color: blue; text-decora=
tion: underline;">Yizhou Li</a></div><div><b>Date:</b>&nbsp;2023-06-29&nbs=
p;20:59</div><div><b>To:</b>&nbsp;<a href=3D"mailto:liupengyjy@chinamobile=
.com" style=3D"color: blue; text-decoration: underline;">Peng Liu</a></div=
><div><b>CC:</b>&nbsp;<a href=3D"mailto:david.black@dell.com" style=3D"col=
or: blue; text-decoration: underline;">david.black</a>; <a href=3D"mailto:=
detnet@ietf.org" style=3D"color: blue; text-decoration: underline;">detnet=
</a>; <a href=3D"mailto:ryoo@etri.re.kr" style=3D"color: blue; text-decora=
tion: underline;">ryoo</a></div><div><b>Subject:</b>&nbsp;[Detnet] suggest=
ed text revision to draft-ietf-detnet-scaling-requirements</div></div></di=
v><div><div class=3D"FoxDiv20230630095329361678">=0A<!--[if gte mso 9]><xm=
l>=0A<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=
=0A</xml><![endif]--><!--[if gte mso 9]><xml>=0A<o:shapelayout v:ext=3D"ed=
it">=0A<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A</o:shapelayout></=
xml><![endif]-->=0A<div class=3D"WordSection1" style=3D"page: WordSection1=
;">=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size:=
 12pt; font-family: =E5=AE=8B=E4=BD=93;"><span lang=3D"EN-US" style=3D"fon=
t-size:10.5pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Hi=
 Peng,<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm=
 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;"><span la=
ng=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,san=
s-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNorma=
l" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=
=8B=E4=BD=93;"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:=
&quot;Calibri&quot;,sans-serif;color:#1F497D">Based on some discussions in=
 the interim, I=E2=80=99d suggest to add the following text to section 3.4=
 of draft-ietf-detnet-scaling-requirements in some=0A place you think appr=
opriate. &nbsp;<o:p></o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"ma=
rgin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;"=
><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&=
quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>=0A<p class=3D=
"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-famil=
y: =E5=AE=8B=E4=BD=93;"><span lang=3D"EN-US" style=3D"font-size:10.5pt;fon=
t-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font=
-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;"><span lang=3D"EN-US" style=
=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F4=
97D">It is generally desired that no per-flow, per-node state machine conf=
iguration is required for better scalability. Provisioning a new flow shou=
ld=0A require as less work as possible, e.g. only the filtering and polici=
ng configuration on the ingress node but not the intermediate nodes. Provi=
sioning on the aggregated flows normally improve the scalability at the co=
st of coarse granularity of the incoming=0A traffic filtering and protecti=
on. In addition, it is desirable that adding a flow to the network does no=
t affect the latency of the existing flows, or that the bounded latency re=
quirement of the existing flows still meets without the complex re-calcula=
tion=0A after adding a new flow.<o:p></o:p></span></p>=0A<p class=3D"MsoNo=
rmal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=
=AE=8B=E4=BD=93;"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-fami=
ly:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size:=
 12pt; font-family: =E5=AE=8B=E4=BD=93;"><span lang=3D"EN-US" style=3D"fon=
t-size:10.5pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o=
:p>&nbsp;</o:p></span></p>=0A<p class=3D"MsoNormal" style=3D"margin: 0cm 0=
cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;"><span lang=
=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1F497D">Thanks,<o:p></o:p></span></p>=0A<p class=3D"MsoNormal=
" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=
=8B=E4=BD=93;"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:=
&quot;Calibri&quot;,sans-serif;color:#1F497D">Yizhou<o:p></o:p></span></p>=
=0A</div>=0A</div></div></blockquote>=0A</body></html>
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