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charset="utf-8"
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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; }body { font-size: 10.5pt; font-fa=
mily: =E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91; color: rgb(0, 0, 0); line-heig=
ht: 1.5; }body { font-size: 10.5pt; color: rgb(0, 0, 0); line-height: 1.5;=
}</style></head><body>=0A<div><span></span>Hi Paolo=EF=BC=8C</div><div><b=
r></div><div>Thank you for you opinion. The extended and large communities=
will be considered after the adoption and according to the working group =
consensus.</div><div><br></div><div>Please see the appendix in the d=
raft for the example. bgpDestinationCommunityList is a basicList of bgpCom=
munity.</div><div><br></div><div>If you don't like the BGP communities acc=
ording to the source IP of a specific flow, you can indicate it in the tem=
plete, i.e. do not specify bgpSourceCommunityList IE in the templete set. =
Then the exporter will not export the information. </div><div><br></d=
iv><div>bgpSourceCommunityList does have values in some network environmen=
ts. For example, the overalll network of China Mobile consists of a =
backbone network and several province networks. Each component network is =
configured with a few communities. BGP anounces those communities among th=
e component networks. When one province wants to know where (i.e. from whi=
ch provinces) its incoming traffic comes from, it can use <span style=
=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;">bgpSou=
rceCommunityList.</span></div>=0A<div><br></div><div>Best Regards,<br>Zhen=
qiang</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-FAMIL=
Y: verdana; FONT-SIZE: 10pt"><div>[email protected]</div></div><=
/span></div>=0A<blockquote style=3D"margin-top: 0px; margin-bottom: 0px; m=
argin-left: 0.5em;"><div> </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; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000=
; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From=
:</b> <a href=3D"mailto:[email protected]">Paolo Lucente</a></div><div><b=
>Date:</b> 2017-02-17 06:52</div><div><b>To:</b> <a href=3D=
"mailto:[email protected]">lizhenqiang</a></div><div><b>CC:</b>&=
nbsp;<a href=3D"mailto:[email protected]">zhoutianran</a>; <a href=3D=
"mailto:[email protected]">opsawg</a>; <a href=3D"mailto:opsawg-chairs@ietf.=
org">opsawg-chairs</a>; <a href=3D"mailto:[email protected]">grow</a>; <a href=
=3D"mailto:[email protected]">[email protected]</a></div><div><b>Subject:</b>&nb=
sp;Re: [GROW] [OPSAWG] WG adoption poll for draft-li-opsawg-ipfix-bgp-comm=
unity-02</div></div></div><div><div> </div>=0A<div>Hi,</div>=0A<div>&=
nbsp;</div>=0A<div>I support Ignas comment with regards to Extended and La=
rge communities.</div>=0A<div> </div>=0A<div>Can you make evident the=
role, ie. via an example, of the bgpCommunity</div>=0A<div>IE compared to=
the one of bgpDestinationCommunityList?</div>=0A<div> </div>=0A<div>=
Also, i'm puzzled by the presence of bgpSourceCommunityList: i see that</d=
iv>=0A<div>in "1. Introduction" you kind of close that up saying that ther=
e is a</div>=0A<div>Mediator that would take care of the correlation - und=
erstandable but</div>=0A<div>then again we all know with a (loosely determ=
ined) level of indirection</div>=0A<div>any problem can be addressed; sinc=
e you also say the draft comes "comes</div>=0A<div>from the field network"=
, i was wondering whether you were subtending to</div>=0A<div>reverse BGP =
lookups to make this work in practice. In which case, i'd</div>=0A<div>say=
warning flag: BGP lookups against the source IP address/prefix of a</div>=
=0A<div>flow would be of no general applicability at all - think, for exam=
ple,</div>=0A<div>to the common case of an ISP (remotely) connected to an =
IXP where you</div>=0A<div>have N BGP peers and hence potentially multiple=
advertisements per</div>=0A<div>prefix, which one you pick for correlatio=
n would not be a deterministic</div>=0A<div>exercise.</div>=0A<div> <=
/div>=0A<div>Paolo</div>=0A<div> </div>=0A<div> </div>=0A<div>&g=
t; On 16 Feb 2017, at 04:15, [email protected] wrote:</div>=0A<d=
iv>> </div>=0A<div>> Dear Ignas,</div>=0A<div>> </div>=0A<div>>=
; Thank you very much for your support and suggestion.</div>=0A<div>> <=
/div>=0A<div>> Since the problem to be solved in this draft comes from =
the field network, we only provide the method to carry standard BGP commmu=
nities in IPFIX. Extended communities are ususlly used for other purposes =
than standard communities, such as route target, actions for BGP flowspec =
etc. Whether or not we really need to cover entended communities, I want t=
o see more comments. Large communities are relavitely new. RFC8092 was pub=
lished recentlly. Anyway, however, it is easy for us to cover both e=
xtended communities [RFC4360] and large communities [RFC8092] after the ad=
option and further comment consensus. Text contribution is welcome. By the=
way, I want to know the opinions about the wide communities. Do we need t=
o cover them together?</div>=0A<div>> </div>=0A<div>> As you said, t=
his draft was a good start. It has value to be a working group item. We ca=
n continue the comments and discussion after the adoption and we will impr=
ove the document according to the consensus. Operational considerations wi=
ll be covered in the next version.</div>=0A<div>> </div>=0A<div>> Be=
st Regards,</div>=0A<div>> Zhenqiang Li</div>=0A<div>> China Mobile<=
/div>=0A<div>> </div>=0A<div>> -----Original Message-----</div=
>=0A<div>> From: GROW [mailto:[email protected]] On Behalf Of Ignas=
Bagdonas</div>=0A<div>> Sent: Tuesday, February 14, 2017 9:46 PM</div>=
=0A<div>> To: Tianran Zhou <[email protected]></div>=0A<div>=
> Cc: [email protected]; [email protected]; [email protected] grow@ietf.=
org <[email protected]></div>=0A<div>> Subject: Re: [GROW] [OPSAWG] W=
G adoption poll for draft-li-opsawg-ipfix-bgp-community-02</div>=0A<div>&g=
t; </div>=0A<div>> Hi there,</div>=0A<div>> </div>=0A<di=
v>> [Copying GROW WG as this might be relevant to their coverage areas]=
</div>=0A<div>> </div>=0A<div>> The document seems to be a goo=
d start but covers only standard communities. This is not sufficient given=
the universal deployment of 4 octet ASNs. Both extended communities [RFC4=
360] and large communities [RFC8092] are needed and are used to address th=
e signalling requirements for AS4 ASNs. Having separate documents each add=
ressing only a specific type of community does not seem practical and rati=
onal. The document should include the definitions for IEs covering extende=
d and large communities.</div>=0A<div>> </div>=0A<div>> What i=
s the logic of selecting multiple communities for export that a prefix may=
have been decorated with? Is it all of them all the time? The upper limit=
may be reaching 16000 standard communities per prefix - would that fit in=
to resulting IPFIX IE? If there is a limit, how does it work? Is there any=
interpretation done on the values of the communities (all types, not just=
standard ones)? Those all are operational considerations aspects and shou=
ld be covered in the document, appendix A likely could be a good place for=
it.</div>=0A<div>> </div>=0A<div>> Security considerations on=
the privacy aspects would to be covered.</div>=0A<div>> </div>=
=0A<div>> Ignas</div>=0A<div>> </div>=0A<div>> </div>=
=0A<div>> </div>=0A<div>> </div>=0A<div>> On 13/02/20=
17 03:36, Tianran Zhou wrote:</div>=0A<div>> > Dear OPSAWG,</div>=0A=
<div>> ></div>=0A<div>> > In Seoul, we got enough interest and=
positive response on this IPFIX IE extension draft.</div>=0A<div>> >=
; By the authors' request, this email starts a formal poll. The chairs wou=
ld like to know if the WG participants agree that the following document s=
hould be adopted as a WG document in OPSAWG.</div>=0A<div>> ></div>=
=0A<div>> > Export BGP community information in IP Flow Information =
Export (IPFIX)</div>=0A<div>> > https://tools.ietf.org/html/draft-li=
-opsawg-ipfix-bgp-community-02</div>=0A<div>> ></div>=0A<div>> &g=
t; The adoption poll will take two weeks. Please let us know your opinion =
by Feb 27. It would also be good to hear who is willing to review and/or i=
mplement or deploy the extension described in the document.</div>=0A<div>&=
gt; ></div>=0A<div>> > Since we already found that the majority o=
f the f2f participants at our IETF97 session like this idea, please do spe=
ak up now if you do not agree or have serious objections (with explanation=
of course).</div>=0A<div>> ></div>=0A<div>> > Regards,</div>=
=0A<div>> > Tianran</div>=0A<div>> ></div>=0A<div>> > __=
_____________________________________________</div>=0A<div>> > OPSAW=
G mailing list</div>=0A<div>> > [email protected]</div>=0A<div>> &g=
t; https://www.ietf.org/mailman/listinfo/opsawg</div>=0A<div>> </=
div>=0A<div>> _______________________________________________</div>=0A<=
div>> GROW mailing list</div>=0A<div>> [email protected]</div>=0A<div>&g=
t; https://www.ietf.org/mailman/listinfo/grow</div>=0A<div>> __________=
_____________________________________</div>=0A<div>> GROW mailing list<=
/div>=0A<div>> [email protected]</div>=0A<div>> https://www.ietf.org/mai=
lman/listinfo/grow</div>=0A<div> </div>=0A<div> </div>=0A</div><=
/blockquote>=0A</body></html>
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