Re: [IPFIX] [GROW] [OPSAWG] WG adoption poll fordraft-li-opsawg-ipfix-bgp-community-02
李振强 <[email protected]> Thu, 16 Feb 2017 20:02:40 +0800
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Thank you P.J. Aitken.
The length of IP=46IX message is sufficient for BGP standard communities,=
since the length of standard community is 4 octets. But the sizes of ext=
ended community, large community and wide community are bigger than the s=
ize of standard community. If the working group agrees to cover the above=
all kinds of communities in this draft, do you think we should open the =
discussion for IP=46IX and basicList message splitting=3F
Sorry for the duplicate mails.
Best Regards
Zhenqiang Li
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=E6=97=A5=E6=9C=9F:2017-02-16 19:16:00
=E6=94=B6=E4=BB=B6=E4=BA=BA:lizhenqiang=40chinamobile.com<lizhenqiang=40c=
hinamobile.com>, grow-bounces<grow-bounces=40ietf.org>, zhoutianran<zhout=
ianran=40huawei.com>
=E4=B8=BB=E9=A2=98:Re: =5BIP=46IX=5D =5BGROW=5D =5BOPSAWG=5D WG adoption =
poll fordraft-li-opsawg-ipfix-bgp-community-02
Ignas Bagdonas wrote:
>The upper limit may be reaching 16000 standard communities per prefix - =
would that fit into resulting IP=46IX IE=3F If there is a limit, how does=
it work=3F
A quick calculation suggests that the maximum would be 16376 x 4-octet AS=
Ns. See the figure below.
The constraining factor is the R=46C7011 IP=46IX Message Header =22Length=
=22 field, since this is only 16 bits.
Splitting a list across multiple IP=46IX messagesis a question which the =
IP=46IX community hasn't discussed.Unfortunately the basicList =22Semanti=
c=22 field only defines the relationship among the different values withi=
n a single message; the relationship among values in different messages i=
s not defined.
IP=46IX Collectors might reasonably assume that information in subsequent=
messages supersedes information in earlier messages, so splitting a list=
across multiple messages would not have the desired effect.
0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 =
8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+-+-+-+-+ =7C Version Number =7C Length =3D65532=
=7C +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =
=7C Export Time =7C +-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =7C Sequence Number=
=7C +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+ =7C Observation Domain ID =7C +-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =7C Set I=
D =3D 256 =7C Length =3D65516=7C +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =7C 255 =7C List Length =3D65=
509=7C semantic=3DallOf=7C +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+ =7C bSCL =46ieldId =3D 459 =7C bSCL =46iel=
d Length=3D4 =7C +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+ =7C bgpSourceCommunityList value 1 =3D x =7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =7C=
bgpSourceCommunityList value 2 =3D x =7C +-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ... =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ =7C =
bgpSourceCommunityList value16376=3D x =7C +-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
P.
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
IP=46IX mailing list
IP=46IX=40ietf.org
https://www.ietf.org/mailman/listinfo/ipfix
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<br><font size=3D=223=22><span style=3D=22-webkit-tap-highlight-color: rg=
ba(26, 26, 26, 0.301961); -webkit-text-size-adjust: auto; background-colo=
r: rgba(255, 255, 255, 0);=22>Thank you P.J. Aitken.</span></font><div><f=
ont size=3D=223=22><span style=3D=22-webkit-tap-highlight-color: rgba(26,=
26, 26, 0.301961); -webkit-text-size-adjust: auto; background-color: rgb=
a(255, 255, 255, 0);=22><br></span></font></div><div><font size=3D=223=22=
><span style=3D=22-webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961)=
; -webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0=
);=22>The length of IP=46IX message is sufficient for BGP standard commun=
ities, since the length of standard community is 4 octets. But the sizes =
of extended community, large community and wide community are bigger than=
the size of standard community. If the working group agrees to cover the=
above all kinds of communities in this draft, do you think we should ope=
n the discussion for IP=46IX and basicList message splitting=3F</span></f=
ont></div><div><font size=3D=223=22><span style=3D=22-webkit-tap-highligh=
t-color: rgba(26, 26, 26, 0.301961); -webkit-text-size-adjust: auto; back=
ground-color: rgba(255, 255, 255, 0);=22><br></span></font></div><div><fo=
nt size=3D=223=22><span style=3D=22-webkit-tap-highlight-color: rgba(26, =
26, 26, 0.301961); -webkit-text-size-adjust: auto; background-color: rgba=
(255, 255, 255, 0);=22>Sorry for the duplicate mails.</span></font></div>=
<div><font size=3D=223=22><span style=3D=22-webkit-tap-highlight-color: r=
gba(26, 26, 26, 0.301961); -webkit-text-size-adjust: auto; background-col=
or: rgba(255, 255, 255, 0);=22><br></span></font></div><div><font size=3D=
=223=22><span style=3D=22-webkit-tap-highlight-color: rgba(26, 26, 26, 0.=
301961); -webkit-text-size-adjust: auto; background-color: rgba(255, 255,=
255, 0);=22>Best Regards </span></font></div><div><font size=3D=223=
=22><span style=3D=22-webkit-tap-highlight-color: rgba(26, 26, 26, 0.3019=
61); -webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255=
, 0);=22>Zhenqiang Li </span></font></div><div><font size=3D=223=22>=
<span style=3D=22-webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961);=
-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0)=
;=22><br></span></font></div><div><br></div><br><font color=3D=22=23a8a8a=
8=22 style=3D=22font-size:15px=22>--=E5=8F=91=E8=87=AA139=E9=82=AE=E7=AE=B1=
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=BD=BB=E6=9D=BE=E7=AE=A1=E7=90=86=E9=82=AE=E7=AE=B1 <a href=3D=22http://p=
ushemail.10086.cn/d/d.html=22><font color=3D=22=23a8a8a8=22>pushemail.100=
86.cn/d/d.html</font></a></font><br><br>=E5=9C=A82017-02-16 19:59:59<br>=E6=
=9D=8E=E6=8C=AF=E5=BC=BA<13911635816=40139.com>=E5=86=99=E9=81=93:<=
br><br><div style=3D=22 padding-left:10px =22><div style=3D=22border-left=
:2px solid =23999999; =22><div style=3D=22font-size: 12px;background:=23e=
fefef;padding:8px;=22><br><b>=E5=8F=91=E4=BB=B6=E4=BA=BA:</b>PJ Aitken &l=
t;pjaitken=40brocade.com><br><b>=E6=97=A5=E6=9C=9F:</b>2017-02-16 19:1=
6:00<br><b>=E6=94=B6=E4=BB=B6=E4=BA=BA:</b>lizhenqiang=40chinamobile.com =
<lizhenqiang=40chinamobile.com> , grow-bounces <grow-bounces=40i=
etf.org> , zhoutianran <zhoutianran=40huawei.com><br><b>=E4=B8=BB=
=E9=A2=98:</b>Re: =5BIP=46IX=5D =5BGROW=5D =5BOPSAWG=5D WG adoption poll =
fordraft-li-opsawg-ipfix-bgp-community-02<br></div><br><div>
<meta content=3D=22text/html; charset=3Dutf-8=22 http-equiv=3D=22Content-=
Type=22>
<title></title>
<p><tt>Ignas Bagdonas wrote:</tt></p>
<p><tt><br></tt> <tt>> The upper limit may be reaching 16000
standard communities per prefix - would that fit into resulting
IP=46IX IE=3F If there is a limit, how does it work=3F</tt></p>
<p><tt><br>
A quick calculation suggests that the maximum would be 16376 x
4-octet ASNs. See the figure below.</tt><tt><br></tt></p>
<p><tt>The constraining factor is the R=46C7011 IP=46IX Message Header
=22Length=22 field, since this is only 16 bits.<br></tt></p>
<p><tt><tt>Splitting a list across multiple IP=46IX
messages</tt></tt> <tt>is a question which the IP=46IX community
hasn't discussed.</tt> <tt>Unfortunately the basicList =22Semantic=22
field only defines the relationship among the different values
within a single message; the relationship among values in different
messages is not defined.<br></tt></p>
<p><tt>IP=46IX Collectors might reasonably assume that information in
subsequent messages supersedes information in earlier messages, so
splitting a list across multiple messages would not have the
desired effect.</tt><tt><br></tt></p>
<p><br></p>
<pre><font face=3D=22Andale Mono=22> 0 1 =
2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C Version Number =7C Length =3D <font color=3D=
=22=23CC0000=22>65532</font> =7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C Export Time =7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C Sequence Number =7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C Observation Domain ID =7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C Set ID =3D 256 =7C Length =3D <font colo=
r=3D=22=23CC0000=22>65516</font> =7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C 255 =7C List Length =3D <font color=3D=22=23CC0000=
=22>65509</font> =7C semantic=3DallOf=7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C bSCL =46ieldId =3D 459 =7C bSCL =46ield Length=3D=
4 =7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C bgpSourceCommunityList value 1 =3D x =7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C bgpSourceCommunityList value 2 =3D x =7C=
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=7C bgpSourceCommunityList value <font color=3D=22=23CC0=
000=22>16376</font> =3D x =7C
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</fo=
nt>
</pre>
<p><tt><br></tt></p>
<p><tt>P.</tt><br></p>
<br>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
<br>IP=46IX mailing list
<br>IP=46IX=40ietf.org
<br>https://www.ietf.org/mailman/listinfo/ipfix
<br></div></div></div>
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_______________________________________________
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