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From: Imtiyaz Mohammad <technotaz2004@gmail.com>
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Subject: [spring] Handling same SID mapped to different prefixes and vice versa cases
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Hello experts !

The draft-ietf-isis-segment-routing-extensions draft states that:

 "The 'Prefix SID' MUST
   be unique within a given IGP domain (when the L-flag is not set)."


Makes sense from usage point of view. What if some implementation does
not enforce a configuration time check and allows such possibilities
in the network wherein the following three situations arise:


(1) Same SID is received from one device and mapped to multiple prefixes.

(2) Same SID is received from two devices and mapped to multiple prefixes.

(3) Same prefix is mapped with two different SID on two different devices.


Let me go through each case with examples.


(1) Same SID is received from one device and mapped to multiple prefixes.


devA-----ISIS------devB


devB has:

     node segment 100 for 30.30.30.30/32

     node segment 100 for 40.40.40.40/32


It sends prefix segment subTLV for both these entries.


devA receives these subTLVs and since they have arrived from the very
same device, the LFIB entries would be same calculated through
30.30.30.30/32:100 or 40.40.40.40/32:100 because your next operation
and nexthops would be identical.


(2) Same SID is received from two devices and mapped to multiple prefixes.


devA-----ISIS---cost10---devB

          |

          |_____cost20___devC


devB has:

     node segment 100 for 30.30.30.30/32


devC has:

     node segment 100 for 40.40.40.40/32


This cause would clearly not work as devA would need to know SID 100
represents devB or devC. So, on receipt on such subTLV entries, we
would syslog an error.


(3) Same prefix is mapped with two different SID on two different devices.


devA-----ISIS---cost10---devB

          |

          |_____cost20___devC


devB has:

     node segment 100 for 30.30.30.30/32


devC has:

     node segment 200 for 30.30.30.30/32


Even in this case, things would fall apart as the 30.30.30.30/32 fec
has two paths, one of them may be the best path or there might be an
ecmp but one would not know when using incoming label 100 or 200 that
the packet would go to devB or devC.


Is my understanding correct for these three scenarios ?


I am thinking that in scenario (2) and (3), on receipt of duplicate
subTLV entries ( same SID different prefixes or vice versa from
different systemIDs ), we should store all of them, mark one of them
as 'active' based on same criteria such highest systemID and use that
for LFIB generation. The inactive subTLV entry would just lie there in
case the active one ceases to exist for some reason later in time at
which point, the inactive one could be made active and used for LFIB
generation.


Comments / Opinions ?




-- 
Imtiyaz

--001a11c12c80b31a60052105ca89
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Hello experts !<div><br></div><div>The=C2=A0draft-ietf-isi=
s-segment-routing-extensions draft states that:</div><div><br></div><div><p=
re class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px=
;color:rgb(0,0,0)"> &quot;The &#39;Prefix SID&#39; MUST
   be unique within a given IGP domain (when the L-flag is not set).&quot;<=
/pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bot=
tom:0px;color:rgb(0,0,0)"><br></pre><pre class=3D"" style=3D"font-size:13.3=
333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Makes sense from u=
sage point of view. What if some implementation does not enforce a configur=
ation time check and allows such possibilities in the network wherein the f=
ollowing three situations arise:</pre><pre class=3D"" style=3D"font-size:13=
.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre c=
lass=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;col=
or:rgb(0,0,0)">(1) Same SID is received from one device and mapped to multi=
ple prefixes.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:=
0px;margin-bottom:0px;color:rgb(0,0,0)">(2) Same SID is received from two d=
evices and mapped to multiple prefixes.</pre><pre class=3D"" style=3D"font-=
size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">(3) Same =
prefix is mapped with two different SID on two different devices.</pre><pre=
 class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;c=
olor:rgb(0,0,0)"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;mar=
gin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Let me go through each case=
 with examples.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-to=
p:0px;margin-bottom:0px;color:rgb(0,0,0)"><br></pre><pre class=3D"" style=
=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">=
<pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0=
px">(1) Same SID is received from one device and mapped to multiple prefixe=
s.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-=
bottom:0px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;margin-t=
op:0px;margin-bottom:0px">devA-----ISIS------devB</pre><pre class=3D"" styl=
e=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre c=
lass=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">de=
vB has:</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;ma=
rgin-bottom:0px">     node segment 100 for <a href=3D"http://30.30.30.30/32=
">30.30.30.30/32</a></pre><pre class=3D"" style=3D"font-size:13.3333px;marg=
in-top:0px;margin-bottom:0px">     node segment 100 for <a href=3D"http://4=
0.40.40.40/32">40.40.40.40/32</a></pre><pre class=3D"" style=3D"font-size:1=
3.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre class=3D"" style=
=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">It sends prefix s=
egment subTLV for both these entries.</pre><pre class=3D"" style=3D"font-si=
ze:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre class=3D"" st=
yle=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">devA receives =
these subTLVs and since they have arrived from the very same device, the LF=
IB entries would be same calculated through <span style=3D"font-size:13.333=
3px;font-family:arial,sans-serif"><a href=3D"http://30.30.30.30/32:100">30.=
30.30.30/32:100</a> or 4</span><span style=3D"font-size:13.3333px;font-fami=
ly:arial,sans-serif"><a href=3D"http://0.40.40.40/32:100">0.40.40.40/32:100=
</a> because your next operation and nexthops would be identical.</span></p=
re><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-botto=
m:0px"><span style=3D"font-size:13.3333px;font-family:arial,sans-serif"><br=
></span></pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;m=
argin-bottom:0px">(2) Same SID is received from two devices and mapped to m=
ultiple prefixes.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-=
top:0px;margin-bottom:0px"><br></pre><pre class=3D"" style=3D"font-size:13.=
3333px;margin-top:0px;margin-bottom:0px"><pre class=3D"" style=3D"font-size=
:13.3333px;margin-top:0px;margin-bottom:0px"><pre class=3D"" style=3D"font-=
size:13.3333px;margin-top:0px;margin-bottom:0px">devA-----ISIS---cost10---d=
evB</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin=
-bottom:0px">          |</pre><pre class=3D"" style=3D"font-size:13.3333px;=
margin-top:0px;margin-bottom:0px">          |_____cost20___devC</pre></pre>=
<pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0=
px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;m=
argin-bottom:0px">devB has:</pre><pre class=3D"" style=3D"font-size:13.3333=
px;margin-top:0px;margin-bottom:0px">     node segment 100 for <a href=3D"h=
ttp://30.30.30.30/32">30.30.30.30/32</a></pre><pre class=3D"" style=3D"font=
-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre class=3D""=
 style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><pre class=
=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">devC h=
as:</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin=
-bottom:0px">     node segment 100 for <a href=3D"http://40.40.40.40/32">40=
.40.40.40/32</a></pre></pre></pre><pre class=3D"" style=3D"font-size:13.333=
3px;margin-top:0px;margin-bottom:0px"><br></pre><pre class=3D"" style=3D"fo=
nt-size:13.3333px;margin-top:0px;margin-bottom:0px">This cause would clearl=
y not work as devA would need to know SID 100 represents devB or devC. So, =
on receipt on such subTLV entries, we would syslog an error.</pre><pre clas=
s=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br><=
/pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bot=
tom:0px">(3) Same prefix is mapped with two different SID on two different =
devices.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;m=
argin-bottom:0px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;ma=
rgin-top:0px;margin-bottom:0px"><pre class=3D"" style=3D"font-size:13.3333p=
x;margin-top:0px;margin-bottom:0px">devA-----ISIS---cost10---devB</pre><pre=
 class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">=
          |</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0p=
x;margin-bottom:0px">          |_____cost20___devC</pre><pre class=3D"" sty=
le=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre =
class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">d=
evB has:</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;m=
argin-bottom:0px">     node segment 100 for <a href=3D"http://30.30.30.30/3=
2">30.30.30.30/32</a></pre><pre class=3D"" style=3D"font-size:13.3333px;mar=
gin-top:0px;margin-bottom:0px"><br></pre><pre class=3D"" style=3D"font-size=
:13.3333px;margin-top:0px;margin-bottom:0px"><pre class=3D"" style=3D"font-=
size:13.3333px;margin-top:0px;margin-bottom:0px">devC has:</pre><pre class=
=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">     n=
ode segment 200 for <a href=3D"http://30.30.30.30/32">30.30.30.30/32</a></p=
re><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-botto=
m:0px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0p=
x;margin-bottom:0px">Even in this case, things would fall apart as the <a h=
ref=3D"http://30.30.30.30/32">30.30.30.30/32</a> fec has two paths, one of =
them may be the best path or there might be an ecmp but one would not know =
when using incoming label 100 or 200 that the packet would go to devB or de=
vC.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin=
-bottom:0px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;margin-=
top:0px;margin-bottom:0px">Is my understanding correct for these three scen=
arios ? </pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;m=
argin-bottom:0px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;ma=
rgin-top:0px;margin-bottom:0px">I am thinking that in scenario (2) and (3),=
 on receipt of duplicate subTLV entries ( same SID different prefixes or vi=
ce versa from different systemIDs ), we should store all of them, mark one =
of them as &#39;active&#39; based on same criteria such highest systemID an=
d use that for LFIB generation. The inactive subTLV entry would just lie th=
ere in case the active one ceases to exist for some reason later in time at=
 which point, the inactive one could be made active and used for LFIB gener=
ation.</pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;mar=
gin-bottom:0px"><br></pre><pre class=3D"" style=3D"font-size:13.3333px;marg=
in-top:0px;margin-bottom:0px">Comments / Opinions ? </pre></pre></pre><pre =
class=3D"" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><=
br></pre></pre><pre class=3D"" style=3D"font-size:13.3333px;margin-top:0px;=
margin-bottom:0px;color:rgb(0,0,0)"><br></pre><div><br></div>-- <br><div cl=
ass=3D"gmail_signature">Imtiyaz</div>
</div></div>

--001a11c12c80b31a60052105ca89--


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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Imtiyaz Mohammad <technotaz2004@gmail.com>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Thu, 1 Oct 2015 19:18:29 +0530
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From: Imtiyaz Mohammad <technotaz2004@gmail.com>
To: Pushpasis Sarkar <psarkar@juniper.net>
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Cc: "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Thanks Pushpasis ! That helps.

On Thu, Oct 1, 2015 at 4:24 PM, Pushpasis Sarkar <psarkar@juniper.net>
wrote:

> Hi imtiyaz,
>
> Thanks for bringing this to the working groups attention. Please find som=
e
> comments inline.
>
> Thanks
> -Pushpasis
>
> From: Isis-wg on behalf of Imtiyaz Mohammad
> Date: Thursday, October 1, 2015 at 12:44 PM
> To: Isis-wg, "spring@ietf.org"
> Subject: [Isis-wg] Handling same SID mapped to different prefixes and
> vice versa cases
>
> Hello experts !
>
> The draft-ietf-isis-segment-routing-extensions draft states that:
>
>  "The 'Prefix SID' MUST
>    be unique within a given IGP domain (when the L-flag is not set)."
>
>
> *[Pushpasis] To me it means no two router in the same IGP domain
> should/can originate the same Prefix Sid index. However it does not mean
> that two or more prefixes originated by the same node cannot share the sa=
me
> prefix sid index as long as another node is not originating any prefix wi=
th
> the same index.*
>
>
> Makes sense from usage point of view. What if some implementation does no=
t enforce a configuration time check and allows such possibilities in the n=
etwork wherein the following three situations arise:
>
>
> (1) Same SID is received from one device and mapped to multiple prefixes.
>
> (2) Same SID is received from two devices and mapped to multiple prefixes=
.
>
> (3) Same prefix is mapped with two different SID on two different devices=
.
>
>
> Let me go through each case with examples.
>
>
> (1) Same SID is received from one device and mapped to multiple prefixes.
>
>
> devA-----ISIS------devB
>
>
> devB has:
>
>      node segment 100 for 30.30.30.30/32
>
>      node segment 100 for 40.40.40.40/32
>
>
> It sends prefix segment subTLV for both these entries.
>
>
> devA receives these subTLVs and since they have arrived from the very sam=
e device, the LFIB entries would be same calculated through 30.30.30.30/32:=
100 or 40.40.40.40/32:100 because your next operation and nexthops would be=
 identical.
>
>
> *[Pushpasis] Totally agree. For example if there are multiple loopback ad=
dresses on a single node, a single unique node sid index can be attached to=
 all the loopback addresses. There can be cases that the operator may need =
to attach separate prefix-sid-indexes with all the loopback address, and I =
don=E2=80=99t say it is possible, but the same cannot be mandatory as well.=
 So receivers receiving multiple prefixes with the same sid index from the =
same node should accept it and program one route for each of the prefixes w=
ith all of them using the same next hop label.*
>
>
> (2) Same SID is received from two devices and mapped to multiple prefixes=
.
>
>
> devA-----ISIS---cost10---devB
>
>           |
>
>           |_____cost20___devC
>
>
> devB has:
>
>      node segment 100 for 30.30.30.30/32
>
>
> devC has:
>
>      node segment 100 for 40.40.40.40/32
>
>
> This cause would clearly not work as devA would need to know SID 100 repr=
esents devB or devC. So, on receipt on such subTLV entries, we would syslog=
 an error.
>
> *[Pushpasis] Totally agree.*
>
>
> (3) Same prefix is mapped with two different SID on two different devices=
.
>
>
> devA-----ISIS---cost10---devB
>
>           |
>
>           |_____cost20___devC
>
>
> devB has:
>
>      node segment 100 for 30.30.30.30/32
>
>
> devC has:
>
>      node segment 200 for 30.30.30.30/32
>
>
> Even in this case, things would fall apart as the 30.30.30.30/32 fec has =
two paths, one of them may be the best path or there might be an ecmp but o=
ne would not know when using incoming label 100 or 200 that the packet woul=
d go to devB or devC.
>
> *[Pushpasis] Agree.*
>
>
> Is my understanding correct for these three scenarios ?
>
>
> I am thinking that in scenario (2) and (3), on receipt of duplicate subTL=
V entries ( same SID different prefixes or vice versa from different system=
IDs ), we should store all of them, mark one of them as 'active' based on s=
ame criteria such highest systemID and use that for LFIB generation. The in=
active subTLV entry would just lie there in case the active one ceases to e=
xist for some reason later in time at which point, the inactive one could b=
e made active and used for LFIB generation.
>
>
> Comments / Opinions ?
>
>
>
>
> --
> Imtiyaz
>



--=20
Mohammad Imtiyaz
Software Engineer
Arista Networks
Bangalore
+91 9901101171

--001a1149021e52fdd805210b4da0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Thanks Pushpasis ! That helps.</div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Thu, Oct 1, 2015 at 4:24 PM, Pushpas=
is Sarkar <span dir=3D"ltr">&lt;<a href=3D"mailto:psarkar@juniper.net" targ=
et=3D"_blank">psarkar@juniper.net</a>&gt;</span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex">



<div style=3D"word-wrap:break-word">
<div style=3D"font-family:Calibri,sans-serif;font-size:14px;color:rgb(0,0,0=
)">
<div>Hi imtiyaz,</div>
<div><br>
</div>
<div>Thanks for bringing this to the working groups attention. Please find =
some comments inline.</div>
<div><br>
</div>
<div>Thanks</div>
<div>-Pushpasis</div>
<div>
<div></div>
</div>
</div>
<div style=3D"font-family:Calibri,sans-serif;font-size:14px;color:rgb(0,0,0=
)">
<br>
</div>
<span style=3D"font-family:Calibri,sans-serif;font-size:14px;color:rgb(0,0,=
0)">
<div style=3D"font-family:Calibri;font-size:12pt;text-align:left;color:blac=
k;BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOTTOM:0in;PADD=
ING-LEFT:0in;PADDING-RIGHT:0in;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:me=
dium none;PADDING-TOP:3pt">
<span style=3D"font-weight:bold">From: </span>Isis-wg on behalf of Imtiyaz =
Mohammad<br>
<span style=3D"font-weight:bold">Date: </span>Thursday, October 1, 2015 at =
12:44 PM<br>
<span style=3D"font-weight:bold">To: </span>Isis-wg, &quot;<a href=3D"mailt=
o:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&quot;<br>
<span style=3D"font-weight:bold">Subject: </span>[Isis-wg] Handling same SI=
D mapped to different prefixes and vice versa cases<br>
</div><span class=3D"">
<div><br>
</div>
<div>
<div>
<div dir=3D"ltr">Hello experts !
<div><br>
</div>
<div>The=C2=A0draft-ietf-isis-segment-routing-extensions draft states that:=
</div>
<div><br>
</div>
<div>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)"> &quot;The &#39;Prefix SID&#39; MUST
   be unique within a given IGP domain (when the L-flag is not set).&quot;<=
/pre>
</div>
</div>
</div>
</div>
</span></span>
<div style=3D"font-family:Calibri,sans-serif;font-size:14px;color:rgb(0,0,0=
)">
<br>
</div>
<div style=3D"font-family:Calibri,sans-serif;font-size:14px"><font color=3D=
"#7f007f"><b>[Pushpasis] To me it means no two router in the same IGP domai=
n should/can originate the same Prefix Sid index. However it does not mean =
that two or more prefixes originated
 by the same node cannot share the same prefix sid index as long as another=
 node is not originating any prefix with the same index.</b></font></div><s=
pan class=3D"">
<span style=3D"font-family:Calibri,sans-serif;font-size:14px;color:rgb(0,0,=
0)">
<div>
<div>
<div dir=3D"ltr">
<div>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)"><br></pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)">Makes sense from usage point of view. What if some implementation=
 does not enforce a configuration time check and allows such possibilities =
in the network wherein the following three situations arise:</pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)"><br></pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)">(1) Same SID is received from one device and mapped to multiple p=
refixes.</pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)">(2) Same SID is received from two devices and mapped to multiple =
prefixes.</pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)">(3) Same prefix is mapped with two different SID on two different=
 devices.</pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)"><br></pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)">Let me go through each case with examples.</pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)"><br></pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rg=
b(0,0,0)"><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0p=
x">(1) Same SID is received from one device and mapped to multiple prefixes=
.</pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">=
<br></pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0p=
x">devA-----ISIS------devB</pre><pre style=3D"font-size:13.3333px;margin-to=
p:0px;margin-bottom:0px"><br></pre><pre style=3D"font-size:13.3333px;margin=
-top:0px;margin-bottom:0px">devB has:</pre><pre style=3D"font-size:13.3333p=
x;margin-top:0px;margin-bottom:0px">     node segment 100 for <a href=3D"ht=
tp://30.30.30.30/32" target=3D"_blank">30.30.30.30/32</a></pre><pre style=
=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">     node segment=
 100 for <a href=3D"http://40.40.40.40/32" target=3D"_blank">40.40.40.40/32=
</a></pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0p=
x"><br></pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom=
:0px">It sends prefix segment subTLV for both these entries.</pre><pre styl=
e=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre s=
tyle=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">devA receives=
 these subTLVs and since they have arrived from the very same device, the L=
FIB entries would be same calculated through <span style=3D"font-size:13.33=
33px;font-family:arial,sans-serif"><a href=3D"http://30.30.30.30/32:100" ta=
rget=3D"_blank">30.30.30.30/32:100</a> or 4</span><span style=3D"font-size:=
13.3333px;font-family:arial,sans-serif"><a href=3D"http://0.40.40.40/32:100=
" target=3D"_blank">0.40.40.40/32:100</a> because your next operation and n=
exthops would be identical.</span></pre></pre>
</div>
</div>
</div>
</div>
</span>
<div style=3D"font-family:Calibri,sans-serif;font-size:14px"><br>
</div>
</span><span>
<div>
<div>
<div dir=3D"ltr">
<div>
<pre style=3D"margin-top:0px;margin-bottom:0px"><pre style=3D"margin-top:0p=
x;margin-bottom:0px"><b><font color=3D"#7f007f" face=3D"Calibri,sans-serif"=
><span style=3D"white-space:normal">[Pushpasis] Totally agree. For example =
if there are multiple loopback addresses on a single node, a single unique =
node sid index can be attached to all the loopback addresses. There can be =
cases that the operator may need to attach separate prefix-sid-indexes with=
 all the loopback address, and=C2=A0I don=E2=80=99t say it is possible, but=
 the same cannot be mandatory as well. So receivers receiving multiple pref=
ixes with the same sid index from the same node should accept it and progra=
m one route for each of the prefixes with all of them using=C2=A0the same=
=C2=A0next hop label.</span></font></b></pre></pre>
</div>
</div>
</div>
</div>
</span><span class=3D"">
<div><br>
</div>
<span>
<div>
<div>
<div dir=3D"ltr">
<div>
<pre style=3D"margin-top:0px;margin-bottom:0px"><pre style=3D"color:rgb(0,0=
,0);font-family:Calibri,sans-serif;font-size:13.3333px;margin-top:0px;margi=
n-bottom:0px">(2) Same SID is received from two devices and mapped to multi=
ple prefixes.</pre><pre style=3D"color:rgb(0,0,0);font-family:Calibri,sans-=
serif;font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre =
style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:13.3333p=
x;margin-top:0px;margin-bottom:0px"><pre style=3D"font-size:13.3333px;margi=
n-top:0px;margin-bottom:0px"><pre style=3D"font-size:13.3333px;margin-top:0=
px;margin-bottom:0px">devA-----ISIS---cost10---devB</pre><pre style=3D"font=
-size:13.3333px;margin-top:0px;margin-bottom:0px">          |</pre><pre sty=
le=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">          |____=
_cost20___devC</pre></pre><pre style=3D"font-size:13.3333px;margin-top:0px;=
margin-bottom:0px"><br></pre><pre style=3D"font-size:13.3333px;margin-top:0=
px;margin-bottom:0px">devB has:</pre><pre style=3D"font-size:13.3333px;marg=
in-top:0px;margin-bottom:0px">     node segment 100 for <a href=3D"http://3=
0.30.30.30/32" target=3D"_blank">30.30.30.30/32</a></pre><pre style=3D"font=
-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre style=3D"f=
ont-size:13.3333px;margin-top:0px;margin-bottom:0px"><pre style=3D"font-siz=
e:13.3333px;margin-top:0px;margin-bottom:0px">devC has:</pre><pre style=3D"=
font-size:13.3333px;margin-top:0px;margin-bottom:0px">     node segment 100=
 for <a href=3D"http://40.40.40.40/32" target=3D"_blank">40.40.40.40/32</a>=
</pre></pre></pre><pre style=3D"color:rgb(0,0,0);font-family:Calibri,sans-s=
erif;font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre s=
tyle=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:13.3333px=
;margin-top:0px;margin-bottom:0px">This cause would clearly not work as dev=
A would need to know SID 100 represents devB or devC. So, on receipt on suc=
h subTLV entries, we would syslog an error.</pre></pre>
</div>
</div>
</div>
</div>
</span>
</span><div><b style=3D"color:rgb(127,0,127);font-family:Calibri,sans-serif=
;font-size:14px">[Pushpasis] Totally agree.</b></div><span class=3D"">
<span>
<div>
<div>
<div dir=3D"ltr">
<div>
<pre style=3D"margin-top:0px;margin-bottom:0px"><pre style=3D"color:rgb(0,0=
,0);font-family:Calibri,sans-serif;font-size:13.3333px;margin-top:0px;margi=
n-bottom:0px"><br></pre><pre style=3D"color:rgb(0,0,0);font-family:Calibri,=
sans-serif;font-size:13.3333px;margin-top:0px;margin-bottom:0px">(3) Same p=
refix is mapped with two different SID on two different devices.</pre><pre =
style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:13.3333p=
x;margin-top:0px;margin-bottom:0px"><br></pre><pre style=3D"color:rgb(0,0,0=
);font-family:Calibri,sans-serif;font-size:13.3333px;margin-top:0px;margin-=
bottom:0px"><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:=
0px">devA-----ISIS---cost10---devB</pre><pre style=3D"font-size:13.3333px;m=
argin-top:0px;margin-bottom:0px">          |</pre><pre style=3D"font-size:1=
3.3333px;margin-top:0px;margin-bottom:0px">          |_____cost20___devC</p=
re><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br>=
</pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">d=
evB has:</pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-botto=
m:0px">     node segment 100 for <a href=3D"http://30.30.30.30/32" target=
=3D"_blank">30.30.30.30/32</a></pre><pre style=3D"font-size:13.3333px;margi=
n-top:0px;margin-bottom:0px"><br></pre><pre style=3D"font-size:13.3333px;ma=
rgin-top:0px;margin-bottom:0px"><pre style=3D"font-size:13.3333px;margin-to=
p:0px;margin-bottom:0px">devC has:</pre><pre style=3D"font-size:13.3333px;m=
argin-top:0px;margin-bottom:0px">     node segment 200 for <a href=3D"http:=
//30.30.30.30/32" target=3D"_blank">30.30.30.30/32</a></pre><pre style=3D"f=
ont-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre style=
=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">Even in this case=
, things would fall apart as the <a href=3D"http://30.30.30.30/32" target=
=3D"_blank">30.30.30.30/32</a> fec has two paths, one of them may be the be=
st path or there might be an ecmp but one would not know when using incomin=
g label 100 or 200 that the packet would go to devB or devC.</pre></pre></p=
re></pre>
</div>
</div>
</div>
</div>
</span>
</span><div><b><font color=3D"#7f007f" face=3D"Calibri,sans-serif">[Pushpas=
is]=C2=A0Agree.</font></b></div><span class=3D"">
<span>
<div>
<div>
<div dir=3D"ltr">
<div>
<pre style=3D"margin-top:0px;margin-bottom:0px"><pre style=3D"color:rgb(0,0=
,0);font-family:Calibri,sans-serif;font-size:13.3333px;margin-top:0px;margi=
n-bottom:0px"><pre style=3D"font-size:13.3333px;margin-top:0px;margin-botto=
m:0px"><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">=
<br></pre><pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0p=
x">Is my understanding correct for these three scenarios ? </pre><pre style=
=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre st=
yle=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">I am thinking =
that in scenario (2) and (3), on receipt of duplicate subTLV entries ( same=
 SID different prefixes or vice versa from different systemIDs ), we should=
 store all of them, mark one of them as &#39;active&#39; based on same crit=
eria such highest systemID and use that for LFIB generation. The inactive s=
ubTLV entry would just lie there in case the active one ceases to exist for=
 some reason later in time at which point, the inactive one could be made a=
ctive and used for LFIB generation.</pre><pre style=3D"font-size:13.3333px;=
margin-top:0px;margin-bottom:0px"><br></pre><pre style=3D"font-size:13.3333=
px;margin-top:0px;margin-bottom:0px">Comments / Opinions ? </pre></pre></pr=
e><pre style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:1=
3.3333px;margin-top:0px;margin-bottom:0px"><br></pre></pre>
<pre style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:13.=
3333px;margin-top:0px;margin-bottom:0px"><br></pre>
<div style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14p=
x">
<br>
</div>
<font face=3D"Calibri,sans-serif">-- </font><br>
<div style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14p=
x">
Imtiyaz</div>
</div>
</div>
</div>
</div>
</span>
</span></div>

</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature">Mohammad Imtiyaz<br>Software Engineer<br>Arista Networ=
ks<br>Bangalore<br>+91 9901101171<br></div>
</div>

--001a1149021e52fdd805210b4da0--


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Thread-Topic: IETF 94 agenda topics
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Folks,

SPRING will meet at IETF-94, currently on Tuesday, November 03, from 09:00 =
to 10:30.  Please forward any SPRING agenda items you might have to John an=
d me.  The deadline is Monday October 12 (next week) by 10:00 U.S. Eastern =
Time.  Priority will be given to those who get their requests in by the dea=
dline, though if agenda space permits it we will consider requests gotten i=
n before October 23 at 08:00 U.S. Eastern Time.

We have a short meeting slot this time, so it is quite possible we may not =
be able to accommodate all requests. I apologize in advance if your request=
 has to be declined. We'll give preference to work that directly advances t=
he WG charter, especially charter items at risk of slipping, and to work th=
at requires interactive discussion rather than status reports or presentati=
ons of results. Please keep in mind that the mailing list is always availab=
le for such reports and we encourage you to use it.

If you have previously presented on your topic at a SPRING meeting, please =
explain in your request what you hope to achieve with your presentation thi=
s time. If you have requested to present the same work at multiple WGs, ple=
ase note this so that we can coordinate as needed.

You should plan to send your slides to John and me no later than 24 hours p=
rior to the meeting, though again, earlier is better. If we don't have your=
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for the benefit of remote attendees, and if you plan to use any fancy build=
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should assume your slides may be converted to PDF and presented from the PD=
F.

Finally, if you request an agenda slot, please do so by replying to this me=
ssage, making sure to include both Bruno and me in the To: or Cc: and don't=
 change the subject line. Please include the name of the person who will be=
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ncluding Q/A).

Thanks,

-- Bruno & John


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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Pushpasis Sarkar <psarkar@juniper.net>, Imtiyaz Mohammad <technotaz2004@gmail.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Wed, 7 Oct 2015 10:35:18 +0000
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References: <CANk4F3Ppzo2_Xkc2V_x=Q6LEWQvMUb-2_h+Xd-mwzr3WzE85bA@mail.gmail.com> <72EDEE92-4D49-49E0-99F7-9C6B18332A37@juniper.net> <CANk4F3NN0dZJD5UbWP-vWmFkpvRzHxHt0S-wxZoL-gRK7NUKgw@mail.gmail.com> <CEDEA62E-81F6-4369-9322-812DBE378F70@juniper.net> <7291C678-FAD8-4F09-B27A-13E9C459ABAD@cisco.com> <4732AB55-9A49-49AD-A892-AB8500FC55BA@juniper.net> <F7C6BEF9-09CA-4A2D-98D6-1E910E9DD564@cisco.com> <7C10E932-79E0-4FF3-9C1D-D7D7E4F71EC2@juniper.net>
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>, Imtiyaz Mohammad <technotaz2004@gmail.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Robert Raszuk <robert@raszuk.net>
To: Pushpasis Sarkar <psarkar@juniper.net>
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Archived-At: <http://mailarchive.ietf.org/arch/msg/spring/0EWMHrd6bAcAuuKdUV7bj82uRDE>
Cc: Hannes Gredler <hannes@gredler.at>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Stefano Previdi \(sprevidi\)" <sprevidi@cisco.com>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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--047d7bfd006e3a77b5052181f07e
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Hi Pushpasis
=E2=80=8B,


*[Pushpasis] No. I seem to be repeating myself. But your suggestion of
recursing will result in tunnelling traffic destined for all prefixes
originated (not only loopback addresses) though MPLS. Operator may not
like/want this. So associating the sid-index with the loopback address
with a specific address provides flexibility in picking which prefixes
should be tunneled and which ones need not.*
>
>
=E2=80=8BI do not quite agree with your above statement. Clearly you are th=
inking
in terms how traditional MPLS router with perhaps specific implementation
resolves paths and building forwarding tables in MPLS domain.

Let's observe that Segment Routing imposition may but not necessarily must
use the same imposition algorithm/mechanism.

=E2=80=8BI can easily see a case at ingress where only carefully selected b=
y
operator subset of prefixes originated by exit X will be MPLS segment
routed in the given domain. Rest may be native switched or IP
tunneled/encapsulated.

As examples that can be accomplished by controller driven ingress map or
use multiple next hops (the case where you propagate by BGP).

Cheers,
R.

--047d7bfd006e3a77b5052181f07e
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small"><span style=3D"font-family:arial,sans-s=
erif">Hi Pushpasis</span><div class=3D"gmail_default" style=3D"display:inli=
ne">=E2=80=8B,</div><br></div><div class=3D"gmail_extra"><div class=3D"gmai=
l_quote"><font face=3D"arial, helvetica, sans-serif"><br></font><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex"><div style=3D"word-wrap:break-word"><span class=3D""><s=
pan style=3D"font-family:Calibri,sans-serif;font-size:14px;color:rgb(0,0,0)=
"><div><div style=3D"word-wrap:break-word"><div><div><div style=3D"font-fam=
ily:LucidaGrande">
</div>
</div>
</div>
</div>
</div>
</span>
</span><div>
<pre style=3D"margin-top:0px;margin-bottom:0px;padding:0px;word-wrap:break-=
word;word-break:normal"><font color=3D"#00007f"><b><font face=3D"Calibri,sa=
ns-serif"><span style=3D"white-space:pre-wrap">[Pushpasis] No. I seem to be=
 repeating myself. But your suggestion of recursing will result in tunnelli=
ng traffic destined for all prefixes originated (not only loopback addresse=
s) though MPLS. Operator may not like/want this. So associating the sid-ind=
ex with the loopback address with a specific address provides flexibility i=
n picking which prefixes should be tunneled and which ones need not.</span>=
</font></b></font></pre></div></div></blockquote><div><br></div><div><div c=
lass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font=
-size:small">=E2=80=8BI do not quite agree with your above statement. Clear=
ly you are thinking in terms how traditional MPLS router with perhaps speci=
fic implementation resolves paths and building forwarding tables in MPLS do=
main.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" =
style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Let&#39;s =
observe that Segment Routing imposition may but not necessarily must use th=
e same imposition algorithm/mechanism.=C2=A0</div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">=E2=80=8BI can easily see a case at ingress where on=
ly carefully selected by operator subset of prefixes originated by exit X w=
ill be MPLS segment routed in the given domain. Rest may be native switched=
 or IP tunneled/encapsulated.=C2=A0</div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small">As examples that can be accomplished by controller driven ing=
ress map or use multiple next hops (the case where you propagate by BGP).</=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"font=
-family:arial,helvetica,sans-serif;font-size:small">Cheers,</div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">R.</div><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small"><br></div></div></div></div></div>

--047d7bfd006e3a77b5052181f07e--


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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Pushpasis Sarkar <psarkar@juniper.net>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
Thread-Index: AQHRAEs1PgpDoCRL5ESvVXDX7il8655fAjCAgAAPcYCAABejgIAA72QAgAASZoCAAAb8gIAAEPGA
Date: Wed, 7 Oct 2015 12:00:57 +0000
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Cc: Imtiyaz Mohammad <technotaz2004@gmail.com>, Hannes Gredler <hannes@gredler.at>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: <bruno.decraene@orange.com>
To: Pushpasis Sarkar <psarkar@juniper.net>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Wed, 7 Oct 2015 12:13:11 +0000
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Cc: "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>, Imtiyaz Mohammad <technotaz2004@gmail.com>, Pushpasis Sarkar <psarkar@juniper.net>, Hannes Gredler <hannes@gredler.at>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Pushpasis Sarkar <psarkar@juniper.net>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Wed, 7 Oct 2015 13:56:19 +0000
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References: <CANk4F3Ppzo2_Xkc2V_x=Q6LEWQvMUb-2_h+Xd-mwzr3WzE85bA@mail.gmail.com> <72EDEE92-4D49-49E0-99F7-9C6B18332A37@juniper.net> <CANk4F3NN0dZJD5UbWP-vWmFkpvRzHxHt0S-wxZoL-gRK7NUKgw@mail.gmail.com> <CEDEA62E-81F6-4369-9322-812DBE378F70@juniper.net> <7291C678-FAD8-4F09-B27A-13E9C459ABAD@cisco.com> <4732AB55-9A49-49AD-A892-AB8500FC55BA@juniper.net> <F7C6BEF9-09CA-4A2D-98D6-1E910E9DD564@cisco.com> <7C10E932-79E0-4FF3-9C1D-D7D7E4F71EC2@juniper.net> <A6CCC50F-9FF9-4202-9464-C9E006739956@cisco.com> <24BDF966-64FD-469D-A165-C83AAE0D29DE@juniper.net> <23371_1444219992_56150C58_23371_138_1_53C29892C857584299CBF5D05346208A0F670DD4@OPEXCLILM21.corporate.adroot.infra.ftgroup> <58B51DCB-6835-4287-86E8-2E7160A725EF@juniper.net>
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Cc: Hannes Gredler <hannes@gredler.at>, Imtiyaz Mohammad <technotaz2004@gmail.com>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Pushpasis Sarkar <psarkar@juniper.net>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Wed, 7 Oct 2015 14:01:43 +0000
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Cc: Hannes Gredler <hannes@gredler.at>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, Robert Raszuk <robert@raszuk.net>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Wed, 7 Oct 2015 14:02:00 +0000
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Cc: Hannes Gredler <hannes@gredler.at>, Imtiyaz Mohammad <technotaz2004@gmail.com>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Pushpasis Sarkar <psarkar@juniper.net>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Wed, 7 Oct 2015 14:27:09 +0000
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Cc: Hannes Gredler <hannes@gredler.at>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>, "spring@ietf.org" <spring@ietf.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, Robert Raszuk <robert@raszuk.net>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Hi Pushpasis,

On 10/7/15 19:51 , Pushpasis Sarkar wrote:
> HI Stefano,
>
> From: "Stefano Previdi (sprevidi)"
> Date: Wednesday, October 7, 2015 at 7:31 PM
> To: Pushpasis Sarkar
> Cc: Robert Raszuk, Hannes Gredler, "spring@ietf.org
> <mailto:spring@ietf.org>", Isis-wg, "Clarence Filsfils (cfilsfil)"
> Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different
> prefixes and vice versa cases
>
> You decide on a per-prefix base,  which node-sid of the originator you
> want to use (if any).
> *[Pushpasis] The default policy for deciding the sid to use should be
> the sid associated with prefix in the advertisement. Off course that can
> be overridden with some local policy but that is upto the
> implementation. The default behavior should be to use the sid associated
> with the prefix originally. With that default behavior the ingress
> should be able to use the same tunnel for more than one prefixes all
> originated from the same node.

how do you envision to find out the node originating a prefix in case of 
inter-area prefixe?

thanks,
Peter

> Which means that the originator should be
> able associate the same node-sid with more than one prefixes originated
> locally on that node.*
> *
> *
> *The question I have is what is the problem if we associate the same
> index for multiple prefix as long as those prefixes are all originated
> on the same node? I don’t see a issue yet. If you can pick an example
> and illustrate the issue you have in mind, perhaps it will help me to
> get convinced as well..*
> *
> *
> *Thanks*
> *-Pushpasis*
>
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>


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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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if I understand you reply to Peter correctly, does this means that 
multi-prefix SID should not be leaked outside its originating area?

Ahmed


On 10/8/2015 6:11 AM, Pushpasis Sarkar wrote:
> Hi Peter,
>
>
>
>
> On 10/8/15, 6:03 PM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>
>> how do you envision to find out the node originating a prefix in case of
>> inter-area prefixe?
> [Pushpasis] The ABR on the originating area/level should be able to detect the anomaly like other nodes in the same area/level and block re-advertisement.
>
> Thanks
> -Pushpasis
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Pushpasis Sarkar <psarkar@juniper.net>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Thu, 8 Oct 2015 15:21:33 +0000
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References: <CANk4F3Ppzo2_Xkc2V_x=Q6LEWQvMUb-2_h+Xd-mwzr3WzE85bA@mail.gmail.com> <72EDEE92-4D49-49E0-99F7-9C6B18332A37@juniper.net> <CANk4F3NN0dZJD5UbWP-vWmFkpvRzHxHt0S-wxZoL-gRK7NUKgw@mail.gmail.com> <CEDEA62E-81F6-4369-9322-812DBE378F70@juniper.net> <7291C678-FAD8-4F09-B27A-13E9C459ABAD@cisco.com> <4732AB55-9A49-49AD-A892-AB8500FC55BA@juniper.net> <F7C6BEF9-09CA-4A2D-98D6-1E910E9DD564@cisco.com> <7C10E932-79E0-4FF3-9C1D-D7D7E4F71EC2@juniper.net> <A6CCC50F-9FF9-4202-9464-C9E006739956@cisco.com> <24BDF966-64FD-469D-A165-C83AAE0D29DE@juniper.net> <CA+b+ER=GmRsHf-AY9z6J2efv6+DerZ57u3SmpxU6nz-KR4KqNQ@mail.gmail.com> <74C4B546-FD77-4F4A-A4F0-4B2C9BE647B2@juniper.net> <F315D557-D627-4F5A-A1BD-D2BDB5310EF3@cisco.com> <3FD87060-6C13-4015-A3B7-A32B10CAE8E3@juniper.net> <5616628D.4070606@cisco.com> <E7DCBC65-0356-4A70-8674-B3D86EA827AB@juniper.net>
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Pushpasis -

Not all conflicts are intra-area - so your response does not cover all case=
s.

In addition, your proposal introduces some new problem areas. Do we leak th=
e prefix but remove the conflicting SID info or stop leaking the prefix ent=
irely?

If you think about these issues I believe the advantage of Stefano's propos=
al becomes clear.

     Les

> -----Original Message-----
> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Pushpasis Sark=
ar
> Sent: Thursday, October 08, 2015 6:12 AM
> To: Peter Psenak (ppsenak); Stefano Previdi (sprevidi)
> Cc: Hannes Gredler; spring@ietf.org; Robert Raszuk; isis-wg@ietf.org list=
;
> Clarence Filsfils (cfilsfil)
> Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different
> prefixes and vice versa cases
>=20
> Hi Peter,
>=20
>=20
>=20
>=20
> On 10/8/15, 6:03 PM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>=20
> >how do you envision to find out the node originating a prefix in case
> >of inter-area prefixe?
> [Pushpasis] The ABR on the originating area/level should be able to detec=
t
> the anomaly like other nodes in the same area/level and block re-
> advertisement.
>=20
> Thanks
> -Pushpasis
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>, Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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From: Pushpasis Sarkar <psarkar@juniper.net>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [Isis-wg] [spring] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Hi Pushpasis,

On 10/8/15 18:41 , Pushpasis Sarkar wrote:
> Hi Peter,
>
>
>
>
> On 10/8/15, 6:03 PM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>
>> how do you envision to find out the node originating a prefix in case of
>> inter-area prefixe?
> [Pushpasis] The ABR on the originating area/level should be able to detect the anomaly like other nodes in the same area/level and block re-advertisement.

Node N1 in area 1 advertises prefix P1 with SID X. ABR1 advertises P1 to 
area 0.
Node N2 in area 2 advertises prefix P2 with SID X, ABR2 advertises P2 to 
area 0.

Node 3 in area 0 get these two prefixes P1 and P2 from two different 
ABRs. How does it know that the originators for P1 and P2 are different? 
Do you expect the ABR1 and ABR2 to detect the collision and withdraw SID 
advertisement to area 0? If yes, that may become source of all sorts of 
problems.

thanks,
Peter

>
> Thanks
> -Pushpasis
>


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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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To: Pushpasis Sarkar <psarkar@juniper.net>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Hi Pushpasis,

On 10/9/15 11:00 , Pushpasis Sarkar wrote:
> HI Peter,
>
>
>
>
> On 10/9/15, 10:10 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>
>> Hi Pushpasis,
>>
>> On 10/8/15 18:41 , Pushpasis Sarkar wrote:
>>> Hi Peter,
>>>
>>>
>>>
>>>
>>> On 10/8/15, 6:03 PM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>>>
>>>> how do you envision to find out the node originating a prefix in case of
>>>> inter-area prefixe?
>>> [Pushpasis] The ABR on the originating area/level should be able to detect the anomaly like other nodes in the same area/level and block re-advertisement.
>>
>> Node N1 in area 1 advertises prefix P1 with SID X. ABR1 advertises P1 to
>> area 0.
>> Node N2 in area 2 advertises prefix P2 with SID X, ABR2 advertises P2 to
>> area 0.
>>
>> Node 3 in area 0 get these two prefixes P1 and P2 from two different
>> ABRs. How does it know that the originators for P1 and P2 are different?
>> Do you expect the ABR1 and ABR2 to detect the collision and withdraw SID
>> advertisement to area 0? If yes, that may become source of all sorts of
>> problems.
> [Pushpasis] Nodes in area 0 can see that for the same prefix there are two prefix-sid advertisements from ABR1 and ABR2 but another advertisement (not re-advertisement) from Node 3.

there is no advertisement from Node 3 in this case. Node 3 is an 
internal router in area 0 (non-ABR). How does node 3 figures out if the 
prefixes P1 and P2 are sourced by the same node or not? Unless you carry 
the originator-id with each prefix, I don't see how you can do that.

thanks,
Peter

> They should then not program a IP->MPLS or MPLS->MPLS route in the FIB and raise a syslog. I am not proposing a withdraw of the prefix-sid subtlv. The syslog should notify the operator of the misconfiguration scenario.
>
> Thanks
> -Pushpasis
>>
>> thanks,
>> Peter
>>
>>>
>>> Thanks
>>> -Pushpasis
>>>
>>


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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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To: Pushpasis Sarkar <psarkar@juniper.net>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Hi Pushpasis,

On 10/9/15 12:33 , Pushpasis Sarkar wrote:
> Hi Peter,
>
> On 10/9/15, 11:34 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>
>
>> Hi Pushpasis,
>>
>>>>
>>>> Node N1 in area 1 advertises prefix P1 with SID X. ABR1 advertises P1 to
>>>> area 0.
>>>> Node N2 in area 2 advertises prefix P2 with SID X, ABR2 advertises P2 to
>>>> area 0.
>>>>
>>>> Node 3 in area 0 get these two prefixes P1 and P2 from two different
>>>> ABRs. How does it know that the originators for P1 and P2 are different?
>>>> Do you expect the ABR1 and ABR2 to detect the collision and withdraw SID
>>>> advertisement to area 0? If yes, that may become source of all sorts of
>>>> problems.
>>> [Pushpasis] Nodes in area 0 can see that for the same prefix there are two prefix-sid advertisements from ABR1 and ABR2 but another advertisement (not re-advertisement) from Node 3.
>>
>> there is no advertisement from Node 3 in this case. Node 3 is an
>> internal router in area 0 (non-ABR). How does node 3 figures out if the
>> prefixes P1 and P2 are sourced by the same node or not? Unless you carry
>> the originator-id with each prefix, I don't see how you can do that.
>
> [Pushpasis] I overlooked that there were two different prefixes P1 and P2 in your example. In that case I will take back my last comment and re-formulate the proposal. For the situation that you mentioned above, here is what how it should be dealt with..
> 1. ABR1 and ABR 2 re-advertises the prefixes P1 and P2 into Area 0.
> 2. ABR1 will learn from ABR2â€™s advertisement in Area 0 that the same index is associated with P1 originated by N1 in Area 1 and and a different prefix P2 (re)originated from another node ABR2 in Area 0. It should then raise a syslog error notifying that this seems to be misconfiguration.
> 3. Likewise, ABR2 will learn from ABR1â€™s advertisement in Area 0 that the same index is associated with P2 originated by N2 in Area 2 and and a different prefix P1 (re)originated from another node ABR1 in Area 0. It should then raise a syslog error notifying that this seems to be misconfiguration.
> 4. And then none of the ABRs should withdraw the prefix-sid-advertisements (I take back my last comment). Things should be left as is till the operator rectifies the configuration.

the question is what Node 3 does? If it assumes that thees are coming 
from same originator, it may end up sending the traffic wrong way, which 
a serious issue.

>
> The basic rule for any node to detect a anomaly and take action should be as followsâ€¦
> A. Multiple prefix originated with same but from same originator.. No need to throw error

we do not seem to have a consistent way to detect the same originator, 
unless we advertise originator with every prefix.

> B. Multiple prefix originated with same index but from different originator..  Throw syslog.. Use the index advertised with best-originator(s) of the prefix for MPLS ingress/transit routes.

there is no best-originator, that is the whole point.

> C. Same prefix originated with different index from same originator.. Throw syslog.. But donâ€™t program MPLS ingress/transit routes for itâ€¦ Ideally this scenario is almost next to impossible unless any implementation allows assoicating multiple sids with a singe prefix.

we should not make the behavior implementation specific.

> D. Same prefix originated with different index from same originator.. Throw syslog.. Use the index advertised with best-originator(s) of the prefixfor MPLS ingress/transit routes.
>
> Hoping I have covered all possible situation with the above set of rules.

the question really is if the above is worth the benefit you get.
It seems that simplicity may be a better option here.

thanks,
Peter


>
> Thanks
> -Pushpasis
>
>
>>
>> thanks,
>> Peter


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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Date: Fri, 09 Oct 2015 16:01:08 +0530
From: Peter Psenak <ppsenak@cisco.com>
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To: Pushpasis Sarkar <psarkar@juniper.net>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
References: <CANk4F3Ppzo2_Xkc2V_x=Q6LEWQvMUb-2_h+Xd-mwzr3WzE85bA@mail.gmail.com> <CEDEA62E-81F6-4369-9322-812DBE378F70@juniper.net> <7291C678-FAD8-4F09-B27A-13E9C459ABAD@cisco.com> <4732AB55-9A49-49AD-A892-AB8500FC55BA@juniper.net> <F7C6BEF9-09CA-4A2D-98D6-1E910E9DD564@cisco.com> <7C10E932-79E0-4FF3-9C1D-D7D7E4F71EC2@juniper.net> <A6CCC50F-9FF9-4202-9464-C9E006739956@cisco.com> <24BDF966-64FD-469D-A165-C83AAE0D29DE@juniper.net> <CA+b+ER=GmRsHf-AY9z6J2efv6+DerZ57u3SmpxU6nz-KR4KqNQ@mail.gmail.com> <74C4B546-FD77-4F4A-A4F0-4B2C9BE647B2@juniper.net> <F315D557-D627-4F5A-A1BD-D2BDB5310EF3@cisco.com> <3FD87060-6C13-4015-A3B7-A32B10CAE8E3@juniper.net> <5616628D.4070606@cisco.com> <E7DCBC65-0356-4A70-8674-B3D86EA827AB@juniper.net> <56174558.3090007@cisco.com> <85DE6522-3668-48BE-824C-879D8F8ADD56@juniper.net> <561758E2.9050400@cisco.com> <A129B64D-264C-488E-B832-CD24D7072B0F@juniper.net> <561788D1.8010205@cisco.com> <F262DE03-3E40-4EBD-B623-B3713C849EA3@juniper.net>
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Cc: Hannes Gredler <hannes@gredler.at>, "spring@ietf.org" <spring@ietf.org>, Robert Raszuk <robert@raszuk.net>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Hi Pushpasis,

On 10/9/15 15:26 , Pushpasis Sarkar wrote:
> Hi Peter,
>
>
>
> On 10/9/15, 2:58 PM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>
>> Hi Pushpasis,
>>
>> On 10/9/15 12:33 , Pushpasis Sarkar wrote:
>>> Hi Peter,
>>>
>>> On 10/9/15, 11:34 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:
>>>
>>>
>>>> Hi Pushpasis,
>>>>
>>>>>>
>>>>>> Node N1 in area 1 advertises prefix P1 with SID X. ABR1 advertises P1 to
>>>>>> area 0.
>>>>>> Node N2 in area 2 advertises prefix P2 with SID X, ABR2 advertises P2 to
>>>>>> area 0.
>>>>>>
>>>>>> Node 3 in area 0 get these two prefixes P1 and P2 from two different
>>>>>> ABRs. How does it know that the originators for P1 and P2 are different?
>>>>>> Do you expect the ABR1 and ABR2 to detect the collision and withdraw SID
>>>>>> advertisement to area 0? If yes, that may become source of all sorts of
>>>>>> problems.
>>>>> [Pushpasis] Nodes in area 0 can see that for the same prefix there are two prefix-sid advertisements from ABR1 and ABR2 but another advertisement (not re-advertisement) from Node 3.
>>>>
>>>> there is no advertisement from Node 3 in this case. Node 3 is an
>>>> internal router in area 0 (non-ABR). How does node 3 figures out if the
>>>> prefixes P1 and P2 are sourced by the same node or not? Unless you carry
>>>> the originator-id with each prefix, I don't see how you can do that.
>>>
>>> [Pushpasis] I overlooked that there were two different prefixes P1 and P2 in your example. In that case I will take back my last comment and re-formulate the proposal. For the situation that you mentioned above, here is what how it should be dealt with..
>>> 1. ABR1 and ABR 2 re-advertises the prefixes P1 and P2 into Area 0.
>>> 2. ABR1 will learn from ABR2â€™s advertisement in Area 0 that the same index is associated with P1 originated by N1 in Area 1 and and a different prefix P2 (re)originated from another node ABR2 in Area 0. It should then raise a syslog error notifying that this seems to be misconfiguration.
>>> 3. Likewise, ABR2 will learn from ABR1â€™s advertisement in Area 0 that the same index is associated with P2 originated by N2 in Area 2 and and a different prefix P1 (re)originated from another node ABR1 in Area 0. It should then raise a syslog error notifying that this seems to be misconfiguration.
>>> 4. And then none of the ABRs should withdraw the prefix-sid-advertisements (I take back my last comment). Things should be left as is till the operator rectifies the configuration.
>>
>> the question is what Node 3 does? If it assumes that thees are coming
>>from same originator, it may end up sending the traffic wrong way, which
>> a serious issue.
> [Pushpasis]Node 3 should follow rule D below. For the ingress traffic at Node 3, it will choose the next-hop towards ABR1 and for P1 and the next hop towards ABR2 for P2. However for the transit route for SID X, it has to choose who is the best-originator (among ABR1 and ABR2) for SID X, and choose the nexthop towards the same. The resulting traffic path may not still be right. But the protocol should not take care of it other than throwing a syslog/error-message. Operator should rectify the misconfiguration.

you have to take into consideration the result of the behavior you are 
proposing. The fact that traffic goes wrong may be a bigger issue than 
you believe.


>
>>
>>>
>>> The basic rule for any node to detect a anomaly and take action should be as followsâ€¦
>>> A. Multiple prefix originated with same but from same originator.. No need to throw error
>>
>> we do not seem to have a consistent way to detect the same originator,
>> unless we advertise originator with every prefix.
>>
>>> B. Multiple prefix originated with same index but from different originator..  Throw syslog.. Use the index advertised with best-originator(s) of the prefix for MPLS ingress/transit routes.
>>
>> there is no best-originator, that is the whole point.
> [Pushpasis]I meant best-(re)originators. So for nodes in Area 0 ABR1 and ABR2 are the (re)originators.

same issue, there is no best-(re)originator, regardless of whatever 
rules we use to choose it.


>
>>
>>> C. Same prefix originated with different index from same originator.. Throw syslog.. But donâ€™t program MPLS ingress/transit routes for itâ€¦ Ideally this scenario is almost next to impossible unless any implementation allows assoicating multiple sids with a singe prefix.
>>
>> we should not make the behavior implementation specific.
> [Pushpasis] Fully agree. That is why I am asking the draft to spell out the expected behavior explicitly. So that all implementations can follow the same behavior.
>>
>>> D. Same prefix originated with different index from different originator.. Throw syslog.. Use the index advertised with best-originator(s) of the prefixfor MPLS ingress/transit routes.
>>>
>>> Hoping I have covered all possible situation with the above set of rules.
>>
>> the question really is if the above is worth the benefit you get.
>> It seems that simplicity may be a better option here.
> [Pushpasis] Often simplicity in implementation also brings a lot of limitations along with. We need to always draw the line somewhere in the middle, and strike a balance between simplicity of the implementation and usability it offers to the end-users. If simplicity limits a user from deploying the solution in his/her existing network, what use is that implementation? :)

there is other side of the coin too. The more complexity you add, more 
difficult will it be to develop, deploy, maintain and support. So you 
need to balance it with the gain you get.

thanks,
Peter

>
> I have already mentioned in a previous mail about the limitation â€˜per-prefix-unique-sid-indexâ€™ approach brings. And I wonâ€™t be repeating myself again and again on this thread anymore.
>
>
> Thanks
> -Pushpasis
>>
>> thanks,
>> Peter
>>
>>
>>>
>>> Thanks
>>> -Pushpasis
>>>
>>>
>>>>
>>>> thanks,
>>>> Peter
>>


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From: Pushpasis Sarkar <psarkar@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Cc: Hannes Gredler <hannes@gredler.at>, "spring@ietf.org" <spring@ietf.org>, Robert Raszuk <robert@raszuk.net>, "isis-wg@ietf.org list" <isis-wg@ietf.org>, "Clarence Filsfils \(cfilsfil\)" <cfilsfil@cisco.com>
Subject: Re: [spring] [Isis-wg] Handling same SID mapped to different prefixes and vice versa cases
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Cc: draft-filsfils-spring-segment-routing-msdc@ietf.org
Subject: Re: [spring] working group adoption call for draft-filsfils-spring-segment-routing-msdc
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Hi All,

This document is adopted as a SPRING WG document. Authors, please =
resubmit as draft-ietf-spring. When resubmitting, please don't forget to =
sort out the author list as discussed below.

Thanks,

=E2=80=93 John

> On Jul 22, 2015, at 9:15 AM, John G.Scudder <jgs@juniper.net> wrote:
>=20
> Dear WG,
>=20
> As we discussed at our meeting yesterday, working group adoption has =
been requested for draft-filsfils-spring-segment-routing-msdc. Please =
reply to the list with your comments, including although not limited to =
whether or not you support adoption. Non-authors are especially =
encouraged to comment.
>=20
> In consideration of the fact that a number of WG calls are going on =
concurrently, we will end the call on August 31, 2015.=20
>=20
> Authors, please indicate whether you are aware of any relevant IPR and =
if so, whether it has been disclosed. Also, the length of the author =
list for this document greatly exceeds the maximum recommended. Assuming =
the document is adopted, the authors should be prepared to correct this =
when submitting as a WG document, ideally by reducing the list to simply =
the active editor(s) and making use of the "contributors" section for =
the full list.
>=20
> Thanks,
>=20
> --Bruno and John


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From nobody Mon Oct 12 02:22:59 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : BGP-Prefix Segment in large-scale data centers
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Jon Mitchell
                          Ebben Aries
                          Petr Lapukhov
	Filename        : draft-ietf-spring-segment-routing-msdc-00.txt
	Pages           : 23
	Date            : 2015-10-12

Abstract:
   This document describes the motivation and benefits for applying
   segment routing in the data-center.  It describes the design to
   deploy segment routing in the data-center, for both the MPLS and IPv6
   dataplanes.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-msdc/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-msdc-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Oct 12 02:41:23 2015
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
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SPRINGers,

this is the WG item version of the MSDC draft.=20


Thanks.
s.



> On Oct 12, 2015, at 11:22 AM, internet-drafts@ietf.org wrote:
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Source Packet Routing in Networking Work=
ing Group of the IETF.
>=20
>        Title           : BGP-Prefix Segment in large-scale data centers
>        Authors         : Clarence Filsfils
>                          Stefano Previdi
>                          Jon Mitchell
>                          Ebben Aries
>                          Petr Lapukhov
> 	Filename        : draft-ietf-spring-segment-routing-msdc-00.txt
> 	Pages           : 23
> 	Date            : 2015-10-12
>=20
> Abstract:
>   This document describes the motivation and benefits for applying
>   segment routing in the data-center.  It describes the design to
>   deploy segment routing in the data-center, for both the MPLS and IPv6
>   dataplanes.
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-msdc/
>=20
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-msdc-00
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
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> Internet-Drafts are also available by anonymous FTP at:
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> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt


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All,

the SPRING slot has been confirmed as originally scheduled:  Tuesday, Novem=
ber 03, from 09:00 to 10:30

This is a reminder to send slot requests.=20

>  The deadline is Monday October 12 (next week) by 10:00 U.S.
> Eastern Time.  Priority will be given to those who get their requests in =
by the
> deadline, though if agenda space permits it we will consider requests got=
ten
> in before October 23 at 08:00 U.S. Eastern Time.

Thank you
Regards
-- Bruno

> From:  bruno.decraene@orange.com
> Sent: Monday, October 05, 2015 10:01 AM
>=20
> Folks,
>=20
> SPRING will meet at IETF-94, currently on Tuesday, November 03, from 09:00
> to 10:30.  Please forward any SPRING agenda items you might have to John
> and me.  The deadline is Monday October 12 (next week) by 10:00 U.S.
> Eastern Time.  Priority will be given to those who get their requests in =
by the
> deadline, though if agenda space permits it we will consider requests got=
ten
> in before October 23 at 08:00 U.S. Eastern Time.
>=20
> We have a short meeting slot this time, so it is quite possible we may no=
t be
> able to accommodate all requests. I apologize in advance if your request =
has
> to be declined. We'll give preference to work that directly advances the =
WG
> charter, especially charter items at risk of slipping, and to work that r=
equires
> interactive discussion rather than status reports or presentations of res=
ults.
> Please keep in mind that the mailing list is always available for such re=
ports
> and we encourage you to use it.
>=20
> If you have previously presented on your topic at a SPRING meeting, please
> explain in your request what you hope to achieve with your presentation t=
his
> time. If you have requested to present the same work at multiple WGs, ple=
ase
> note this so that we can coordinate as needed.
>=20
> You should plan to send your slides to John and me no later than 24 hours
> prior to the meeting, though again, earlier is better. If we don't have y=
our
> slides by the deadline, you may lose your slot. Please number your slides=
 for
> the benefit of remote attendees, and if you plan to use any fancy builds =
or
> transitions you must arrange this with us in advance -- otherwise you sho=
uld
> assume your slides may be converted to PDF and presented from the PDF.
>=20
> Finally, if you request an agenda slot, please do so by replying to this =
message,
> making sure to include both Bruno and me in the To: or Cc: and don't chan=
ge
> the subject line. Please include the name of the person who will be
> presenting and give an estimate for how much time you think you'll need
> (including Q/A).
>=20
> Thanks,
>=20
> -- Bruno & John
>=20
>=20
> ____________________________________________________________
> ____________________________________________________________
> _
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___________________________________________________________________________=
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From nobody Wed Oct 14 07:47:03 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : Segment Routing Architecture
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Bruno Decraene
                          Stephane Litkowski
                          Rob Shakir
	Filename        : draft-ietf-spring-segment-routing-06.txt
	Pages           : 24
	Date            : 2015-10-14

Abstract:
   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through an ordered list of instructions, called
   segments.  A segment can represent any instruction, topological or
   service-based.  A segment can have a local semantic to an SR node or
   global within an SR domain.  SR allows to enforce a flow through any
   topological path and service chain while maintaining per-flow state
   only at the ingress node to the SR domain.

   Segment Routing can be directly applied to the MPLS architecture with
   no change on the forwarding plane.  A segment is encoded as an MPLS
   label.  An ordered list of segments is encoded as a stack of labels.
   The segment to process is on the top of the stack.  Upon completion
   of a segment, the related label is popped from the stack.

   Segment Routing can be applied to the IPv6 architecture, with a new
   type of routing header.  A segment is encoded as an IPv6 address.  An
   ordered list of segments is encoded as an ordered list of IPv6
   addresses in the routing header.  The active segment is indicated by
   the Destination Address of the packet.  The next active segment is
   indicated by a pointer in the new routing header.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-06


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] I-D Action: draft-ietf-spring-segment-routing-06.txt
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just fixed the ip addresses used in the various illustrations.

s.


> On Oct 14, 2015, at 4:47 PM, internet-drafts@ietf.org wrote:
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Source Packet Routing in Networking Work=
ing Group of the IETF.
>=20
>        Title           : Segment Routing Architecture
>        Authors         : Clarence Filsfils
>                          Stefano Previdi
>                          Bruno Decraene
>                          Stephane Litkowski
>                          Rob Shakir
> 	Filename        : draft-ietf-spring-segment-routing-06.txt
> 	Pages           : 24
> 	Date            : 2015-10-14
>=20
> Abstract:
>   Segment Routing (SR) leverages the source routing paradigm.  A node
>   steers a packet through an ordered list of instructions, called
>   segments.  A segment can represent any instruction, topological or
>   service-based.  A segment can have a local semantic to an SR node or
>   global within an SR domain.  SR allows to enforce a flow through any
>   topological path and service chain while maintaining per-flow state
>   only at the ingress node to the SR domain.
>=20
>   Segment Routing can be directly applied to the MPLS architecture with
>   no change on the forwarding plane.  A segment is encoded as an MPLS
>   label.  An ordered list of segments is encoded as a stack of labels.
>   The segment to process is on the top of the stack.  Upon completion
>   of a segment, the related label is popped from the stack.
>=20
>   Segment Routing can be applied to the IPv6 architecture, with a new
>   type of routing header.  A segment is encoded as an IPv6 address.  An
>   ordered list of segments is encoded as an ordered list of IPv6
>   addresses in the routing header.  The active segment is indicated by
>   the Destination Address of the packet.  The next active segment is
>   indicated by a pointer in the new routing header.
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing/
>=20
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-06
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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Archived-At: <http://mailarchive.ietf.org/arch/msg/spring/1Pfj1vdCBKm2aOaAtUh6zaK9HfY>
Subject: Re: [spring] working group adoption call for draft-geib-spring-oam-usecase
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Hi All,

The document is adopted as a working group item. Authors, please =
resubmit as draft-ietf-spring.

Thanks,

--John and Bruno

> On Jul 22, 2015, at 11:13 AM, John G. Scudder <jgs@juniper.net> wrote:
>=20
> [re-send with correct address for isis-wg]
>=20
> Dear WG,
>=20
> As we discussed at our meeting yesterday, working group adoption has =
been requested for draft-geib-spring-oam-usecase. Please reply to the =
list with your comments, including although not limited to whether or =
not you support adoption. Non-authors are especially encouraged to =
comment.
>=20
> In consideration of the fact that a number of WG calls are going on =
concurrently, we will end the call on August 31, 2015.=20
>=20
> Authors, please indicate whether you are aware of any relevant IPR and =
if so, whether it has been disclosed.
>=20
> Thanks,
>=20
> --Bruno and John


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Archived-At: <http://mailarchive.ietf.org/arch/msg/spring/fj8hkVhJtyr3XAkcDUqsN1pIjO8>
Subject: Re: [spring] working group adoption call for draft-filsfils-spring-segment-routing-central-epe
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The document is accepted as a WG document.

Authors, please resubmit as draft-ietf-spring, adjusting the =
author/contributor lists as needed when you do.

Thanks,

--John

> On Jul 22, 2015, at 9:15 AM, John G.Scudder <jgs@juniper.net> wrote:
>=20
> Dear WG,
>=20
> As we discussed at our meeting yesterday, working group adoption has =
been requested for draft-filsfils-spring-segment-routing-central-epe. =
Please reply to the list with your comments, including although not =
limited to whether or not you support adoption. Non-authors are =
especially encouraged to comment.
>=20
> In consideration of the fact that a number of WG calls are going on =
concurrently, we will end the call on August 31, 2015.=20
>=20
> Authors, please indicate whether you are aware of any relevant IPR and =
if so, whether it has been disclosed. Also, the length of the author =
list for this document exceeds the maximum recommended. Assuming the =
document is adopted, the authors should be prepared to correct this when =
submitting as a WG document, ideally by reducing the list to simply the =
active editor(s) and making use of the "contributors" section for the =
full list.
>=20
> Thanks,
>=20
> --Bruno and John
>=20
> _______________________________________________
> spring mailing list
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> https://www.ietf.org/mailman/listinfo/spring


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Archived-At: <http://mailarchive.ietf.org/arch/msg/spring/iLtZwU3JqYK4wFjylN6tLxMTvws>
Subject: Re: [spring] working group adoption call for draft-filsfils-spring-segment-routing-ldp-interop
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The document is accepted as a WG document.

Authors, please resubmit as draft-ietf-spring, adjusting the =
author/contributor lists as needed when you do.

Thanks,

--John

> On Jul 22, 2015, at 9:17 AM, John G. Scudder <jgs@juniper.net> wrote:
>=20
> Dear WG,
>=20
> As we discussed at our meeting yesterday, working group adoption has =
been requested for draft-filsfils-spring-segment-routing-ldp-interop. =
Please reply to the list with your comments, including although not =
limited to whether or not you support adoption. Non-authors are =
especially encouraged to comment.
>=20
> In consideration of the fact that a number of WG calls are going on =
concurrently, we will end the call on August 31, 2015.=20
>=20
> Authors, please indicate whether you are aware of any relevant IPR and =
if so, whether it has been disclosed. Also, the length of the author =
list for this document greatly exceeds the maximum recommended. Assuming =
the document is adopted, the authors should be prepared to correct this =
when submitting as a WG document, ideally by reducing the list to simply =
the active editor(s) and making use of the "contributors" section for =
the full list.
>=20
> Thanks,
>=20
> --Bruno and John
>=20
> P.S.: Cc MPLS owing to the LDP connection. Please respect the =
reply-to.


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Archived-At: <http://mailarchive.ietf.org/arch/msg/spring/VtftfX0qoG_pqtHXLd4fhyagJwE>
Subject: [spring] Call for note-taker, jabber scribe, November 3 SPRING meeting
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Hi All,

As you know we will meet at IETF-94 on Tuesday November 3 at 09:00. Our =
agenda is very full and there is no chance we will make the best use of =
it if we don't have a note-taker arranged in advance. On some occasions =
I have picked up the slack myself rather than hold up the meeting, but I =
will be unable to do that this time.

Can I ask for one or more of you to volunteer to take notes? I realize =
that in some cases, people are not comfortable volunteering since they =
want to be sure they will be able to participate in the Q/A, or because =
they are presenting. That is not an insurmountable problem though, if we =
have several volunteers they can cover for each other. The Etherpad tool =
is one good option for collaborative note-taking.

It would also be helpful if someone would volunteer as Jabber scribe. =
This is limited to announcing what presentation is being given and =
relaying questions (if any) from the Jabber room to the mic, although of =
course if you want to you can do more.

Please consider volunteering. Thanks in advance.

--John=


From nobody Wed Oct 14 11:44:34 2015
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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From nobody Thu Oct 15 00:08:50 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : Use case for a scalable and topology aware MPLS data plane monitoring system
        Authors         : Ruediger Geib
                          Clarence Filsfils
                          Carlos Pignataro
                          Nagendra Kumar
	Filename        : draft-ietf-spring-oam-usecase-00.txt
	Pages           : 12
	Date            : 2015-10-14

Abstract:
   This document describes features and a use case of a path monitoring
   system.  Segment based routing enables a scalable and simple method
   to monitor data plane liveliness of the complete set of paths
   belonging to a single domain.  Compared with legacy MPLS ping and
   path trace, MPLS topology awareness reduces management and control
   plane involvement of OAM measurements while enabling new OAM
   features.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-oam-usecase/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-oam-usecase-00


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : Segment Routing interoperability with LDP
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Ahmed Bashandy
                          Bruno Decraene
                          Stephane Litkowski
	Filename        : draft-ietf-spring-segment-routing-ldp-interop-00.txt
	Pages           : 15
	Date            : 2015-10-14

Abstract:
   A Segment Routing (SR) node steers a packet through a controlled set
   of instructions, called segments, by prepending the packet with an SR
   header.  A segment can represent any instruction, topological or
   service-based.  SR allows to enforce a flow through any topological
   path and service chain while maintaining per-flow state only at the
   ingress node to the SR domain.

   The Segment Routing architecture can be directly applied to the MPLS
   data plane with no change in the forwarding plane.  This drafts
   describes how Segment Routing operates in a network where LDP is
   deployed and in the case where SR-capable and non-SR-capable nodes
   coexist.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-ldp-interop-00


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : Segment Routing Centralized Egress Peer Engineering
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Ebben Aries
                          Daniel Ginsburg
                          Dmitry Afanasiev
	Filename        : draft-ietf-spring-segment-routing-central-epe-00.txt
	Pages           : 19
	Date            : 2015-10-14

Abstract:
   Segment Routing (SR) leverages source routing.  A node steers a
   packet through a controlled set of instructions, called segments, by
   prepending the packet with an SR header.  A segment can represent any
   instruction topological or service-based.  SR allows to enforce a
   flow through any topological path and service chain while maintaining
   per-flow state only at the ingress node of the SR domain.

   The Segment Routing architecture can be directly applied to the MPLS
   dataplane with no change on the forwarding plane.  It requires minor
   extension to the existing link-state routing protocols.

   This document illustrates the application of Segment Routing to solve
   the Egress Peer Engineering (EPE) requirement.  The SR-based EPE
   solution allows a centralized (SDN) controller to program any egress
   peer policy at ingress border routers or at hosts within the domain.
   This document is on the informational track.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-central-epe/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-central-epe-00


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From nobody Fri Oct 16 05:33:37 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : Use Case for a Scalable and Topology-Aware Segment Routing MPLS Data Plane Monitoring System
        Authors         : Ruediger Geib
                          Clarence Filsfils
                          Carlos Pignataro
                          Nagendra Kumar
	Filename        : draft-ietf-spring-oam-usecase-01.txt
	Pages           : 12
	Date            : 2015-10-16

Abstract:
   This document describes features and a use case of a path monitoring
   system.  Segment based routing enables a scalable and simple method
   to monitor data plane liveliness of the complete set of paths
   belonging to a single domain.  Compared with legacy MPLS ping and
   path trace, MPLS topology awareness reduces management and control
   plane involvement of OAM measurements while enabling new and prior
   hard to realise OAM features.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-oam-usecase/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-oam-usecase-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-oam-usecase-01


Please note that it may take a couple of minutes from the time of submission
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Internet-Drafts are also available by anonymous FTP at:
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From nobody Sat Oct 17 12:01:58 2015
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-mpls-02.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : Segment Routing with MPLS data plane
        Authors         : Clarence Filsfils
                          Stefano Previdi
                          Ahmed Bashandy
                          Bruno Decraene
                          Stephane Litkowski
                          Martin Horneffer
                          Rob Shakir
                          Jeff Tantsura
                          Edward Crabbe
	Filename        : draft-ietf-spring-segment-routing-mpls-02.txt
	Pages           : 14
	Date            : 2015-10-17

Abstract:
   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through a controlled set of instructions, called
   segments, by prepending the packet with an SR header.  A segment can
   represent any instruction, topological or service-based.  SR allows
   to enforce a flow through any topological path and service chain
   while maintaining per-flow state only at the ingress node to the SR
   domain.

   Segment Routing can be directly applied to the MPLS architecture with
   no change in the forwarding plane.  This drafts describes how Segment
   Routing operates on top of the MPLS data plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-mpls-02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
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From nobody Sat Oct 17 12:03:03 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : YANG Data Model for Segment Routing
        Authors         : Stephane Litkowski
                          Yingzhen Qu
                          Pushpasis Sarkar
                          Jeff Tantsura
	Filename        : draft-ietf-spring-sr-yang-01.txt
	Pages           : 22
	Date            : 2015-10-17

Abstract:
   This document defines a YANG data model ([RFC6020]) for segment
   routing ([I-D.ietf-spring-segment-routing]) configuration and
   operation.  This YANG model is intended to be used on network
   elements to configure or operate segment routing.  This document
   defines also generic containers that SHOULD be reused by IGP protocol
   modules to support segment routing.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-yang/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-sr-yang-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-sr-yang-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
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--_000_9C0B39752D25404E9CA42AA66767B23Bciscocom_
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FYI,

this is the proposal for carrying traffic using a common sid among prefixes=
.
It covers multiple use cases that have been described on the email thread e=
xchanged a couple of weeks ago.

s.



Begin forwarded message:

From: <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>>
Subject: New Version Notification for draft-filsfils-spring-sr-recursing-in=
fo-00.txt
Date: October 19, 2015 at 8:54:43 AM GMT+2
To: Stefano Previdi <sprevidi@cisco.com<mailto:sprevidi@cisco.com>>, Claren=
ce Filsfils <cfilsfil@cisco.com<mailto:cfilsfil@cisco.com>>, Peter Psenak <=
ppsenak@cisco.com<mailto:ppsenak@cisco.com>>, Stefano Previdi <sprevidi@cis=
co.com<mailto:sprevidi@cisco.com>>, Clarence Filsfils <cfilsfil@cisco.com<m=
ailto:cfilsfil@cisco.com>>, Peter Psenak <ppsenak@cisco.com<mailto:ppsenak@=
cisco.com>>


A new version of I-D, draft-filsfils-spring-sr-recursing-info-00.txt
has been successfully submitted by Stefano Previdi and posted to the
IETF repository.

Name: draft-filsfils-spring-sr-recursing-info
Revision: 00
Title: Segment Routing Recursive Information
Document date: 2015-10-18
Group: Individual Submission
Pages: 8
URL:            https://www.ietf.org/internet-drafts/draft-filsfils-spring-=
sr-recursing-info-00.txt
Status:         https://datatracker.ietf.org/doc/draft-filsfils-spring-sr-r=
ecursing-info/
Htmlized:       https://tools.ietf.org/html/draft-filsfils-spring-sr-recurs=
ing-info-00


Abstract:
  Segment Routing (SR) allows for a flexible definition of end-to-end
  paths within IGP topologies by encoding paths as sequences of
  topological sub-paths, called "segments".  These segments are
  advertised by the link-state routing protocols (IS-IS and OSPF).

  There are use cases where it is desirable to utilize a SID associated
  with a given node in order to transport traffic destined to different
  local services supported by such node.  This document defines the
  mechanism to do so and illustrates it.





Please note that it may take a couple of minutes from the time of submissio=
n
until the htmlized version and diff are available at tools.ietf.org<http://=
tools.ietf.org>.

The IETF Secretariat



--_000_9C0B39752D25404E9CA42AA66767B23Bciscocom_
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</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space;" class=3D"">
FYI,
<div class=3D""><br class=3D"">
</div>
<div class=3D"">this is the proposal for carrying traffic using a common si=
d among prefixes.</div>
<div class=3D"">It covers multiple use cases that have been described on th=
e email thread exchanged a couple of weeks ago.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">s.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D""><br class=3D"">
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">Begin forwarded message:</div>
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etf.org" class=3D"">internet-drafts@ietf.org</a>&gt;<br class=3D"">
</span></div>
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
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</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D""><b class=3D"">New Version Notification =
for draft-filsfils-spring-sr-recursing-info-00.txt</b><br class=3D"">
</span></div>
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
 sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date:
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D"">October 19, 2015 at 8:54:43 AM GMT&#43;=
2<br class=3D"">
</span></div>
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
 sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To:
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D"">Stefano Previdi &lt;<a href=3D"mailto:s=
previdi@cisco.com" class=3D"">sprevidi@cisco.com</a>&gt;, Clarence Filsfils=
 &lt;<a href=3D"mailto:cfilsfil@cisco.com" class=3D"">cfilsfil@cisco.com</a=
>&gt;,
 Peter Psenak &lt;<a href=3D"mailto:ppsenak@cisco.com" class=3D"">ppsenak@c=
isco.com</a>&gt;, Stefano Previdi &lt;<a href=3D"mailto:sprevidi@cisco.com"=
 class=3D"">sprevidi@cisco.com</a>&gt;, Clarence Filsfils &lt;<a href=3D"ma=
ilto:cfilsfil@cisco.com" class=3D"">cfilsfil@cisco.com</a>&gt;,
 Peter Psenak &lt;<a href=3D"mailto:ppsenak@cisco.com" class=3D"">ppsenak@c=
isco.com</a>&gt;<br class=3D"">
</span></div>
<br class=3D"">
<div class=3D""><br class=3D"">
A new version of I-D, draft-filsfils-spring-sr-recursing-info-00.txt<br cla=
ss=3D"">
has been successfully submitted by Stefano Previdi and posted to the<br cla=
ss=3D"">
IETF repository.<br class=3D"">
<br class=3D"">
Name:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><span=
 class=3D"Apple-tab-span" style=3D"white-space:pre"></span>draft-filsfils-s=
pring-sr-recursing-info<br class=3D"">
Revision:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>0=
0<br class=3D"">
Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Segment Routing=
 Recursive Information<br class=3D"">
Document date:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>2015-10-18<br class=3D"">
Group:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Individual Subm=
ission<br class=3D"">
Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>8<br class=3D""=
>
URL: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a h=
ref=3D"https://www.ietf.org/internet-drafts/draft-filsfils-spring-sr-recurs=
ing-info-00.txt" class=3D"">https://www.ietf.org/internet-drafts/draft-fils=
fils-spring-sr-recursing-info-00.txt</a><br class=3D"">
Status: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"https://=
datatracker.ietf.org/doc/draft-filsfils-spring-sr-recursing-info/" class=3D=
"">https://datatracker.ietf.org/doc/draft-filsfils-spring-sr-recursing-info=
/</a><br class=3D"">
Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"https://tools.ietf=
.org/html/draft-filsfils-spring-sr-recursing-info-00" class=3D"">https://to=
ols.ietf.org/html/draft-filsfils-spring-sr-recursing-info-00</a><br class=
=3D"">
<br class=3D"">
<br class=3D"">
Abstract:<br class=3D"">
&nbsp;&nbsp;Segment Routing (SR) allows for a flexible definition of end-to=
-end<br class=3D"">
&nbsp;&nbsp;paths within IGP topologies by encoding paths as sequences of<b=
r class=3D"">
&nbsp;&nbsp;topological sub-paths, called &quot;segments&quot;. &nbsp;These=
 segments are<br class=3D"">
&nbsp;&nbsp;advertised by the link-state routing protocols (IS-IS and OSPF)=
.<br class=3D"">
<br class=3D"">
&nbsp;&nbsp;There are use cases where it is desirable to utilize a SID asso=
ciated<br class=3D"">
&nbsp;&nbsp;with a given node in order to transport traffic destined to dif=
ferent<br class=3D"">
&nbsp;&nbsp;local services supported by such node. &nbsp;This document defi=
nes the<br class=3D"">
&nbsp;&nbsp;mechanism to do so and illustrates it.<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
Please note that it may take a couple of minutes from the time of submissio=
n<br class=3D"">
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" class=3D"">
tools.ietf.org</a>.<br class=3D"">
<br class=3D"">
The IETF Secretariat<br class=3D"">
<br class=3D"">
</div>
</blockquote>
</div>
<br class=3D"">
</div>
</body>
</html>

--_000_9C0B39752D25404E9CA42AA66767B23Bciscocom_--


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : SPRING Problem Statement and Requirements
        Authors         : Stefano Previdi
                          Clarence Filsfils
                          Bruno Decraene
                          Stephane Litkowski
                          Martin Horneffer
                          Rob Shakir
	Filename        : draft-ietf-spring-problem-statement-05.txt
	Pages           : 16
	Date            : 2015-10-19

Abstract:
   The ability for a node to specify a forwarding path, other than the
   normal shortest path, that a particular packet will traverse,
   benefits a number of network functions.  Source-based routing
   mechanisms have previously been specified for network protocols, but
   have not seen widespread adoption.  In this context, the term
   'source' means 'the point at which the explicit route is imposed' and
   therefore it is not limited to the originator of the packet (i.e.:
   the node imposing the explicit route may be the ingress node of an
   operator's network).

   This document outlines various use cases, with their requirements,
   that need to be taken into account by the Source Packet Routing in
   Networking (SPRING) architecture for unicast traffic.  Multicast use-
   cases and requirements are out of scope of this document.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-problem-statement/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-spring-problem-statement-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-problem-statement-05


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Folks,

The agenda has been posted, you can find it at https://www.ietf.org/proceed=
ings/94/agenda/agenda-94-spring

We had many more requests and suggestions for presentations than we were ab=
le to accommodate. We prioritized in favor of items that are needed to adva=
nce the WG charter over others that while related or interesting don't dire=
ctly advance the charter. As always, we encourage you to use the mailing li=
st to discuss your drafts -- there is no need to wait for a meeting and pre=
sentation to start your discussion!

Looking forward to seeing you in Yokohama.

--Bruno


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<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
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t 687.0pt 732.8pt">
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w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR">Folks,<o:p></o:p></span></p>
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.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
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t 687.0pt 732.8pt">
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w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR">The agenda has been
<span class=3D"GramE">posted,</span> you can find it at https://www.ietf.or=
g/proceedings/94/agenda/agenda-94-spring<o:p></o:p></span></p>
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ge:EN-US;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR">We had many more requests and suggestions=
 for presentations than we were able to accommodate. We
 prioritized in favor of items that are needed to advance the WG charter ov=
er others that while related or interesting don't directly advance the char=
ter. As always, we encourage you to use the mailing list to discuss your dr=
afts -- there is no need to wait
 for a meeting and presentation to start your discussion!<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span class=3D"GramE"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-f=
amily:&quot;Courier New&quot;;mso-fareast-font-family:&quot;Times New Roman=
&quot;;mso-ansi-language:EN-US;mso-fareast-language:FR">Looking forward to =
seeing you in Yokohama.</span></span><span lang=3D"EN-US" style=3D"font-siz=
e:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-font-family:&quot;=
Times New Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language:FR">
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-far=
east-font-family:&quot;Times New Roman&quot;;mso-fareast-language:FR">--Bru=
no<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<PRE>______________________________________________________________________=
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From nobody Thu Oct 22 09:00:05 2015
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From: <bruno.decraene@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Thread-Topic: New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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Date: Thu, 22 Oct 2015 15:59:56 +0000
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References: <20151014175706.19378.6826.idtracker@ietfa.amsl.com> <e3eda6516a0547d7a55d90f7f4f58800@XCH-ALN-001.cisco.com>
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Subject: Re: [spring] New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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Les,

As an individual contributor, I have a clarification question regarding Seg=
ment Identifier Conflicts=20
https://tools.ietf.org/html/draft-ginsberg-spring-conflict-resolution-00#se=
ction-3
=20
In the IGP, (Prefix, SID) mapping may be advertised via either Prefix-SID (=
sub-TLV attached to an IP Prefix) or Mapping Server (Mapping Server Prefix-=
SID in the Binding TLV).
The draft generalizes both by defining and using a generalized mapping entr=
y.
Hence the draft seems to make no distinction between Prefix-SID and Remote-=
Binding SID advertised by the Mapping Server. Is this a correct understandi=
ng?

OTOH, the "IS-IS Extensions for Segment Routing" IS-IS WG draft, specify th=
at a distinction must be made:=20
"   For a given prefix, if both a MS entry with its Prefix-SID Sub-TLV
   and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, the
   Prefix-SID advertised within the Prefix TLV MUST be preferred while
   the MS entry MUST be ignored."
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06#section-3.=
6.1

So is your intention to:
- change the IS-IS specification to remove this rule (preference for Prefix=
-SID Sub-TLV)?
- or adapt your draft to accommodate for this rule?

Thanks,
Regards,
Bruno

> From: Les Ginsberg (ginsberg) > Sent: Wednesday, October 14, 2015 8:44 PM
> Folks -
>=20
> Would like to call your attention to this new draft.
>=20
>    Les
>=20
> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: Wednesday, October 14, 2015 10:57 AM
> To: Peter Psenak (ppsenak); Les Ginsberg (ginsberg); Stefano Previdi
> (sprevidi)
> Subject: New Version Notification for draft-ginsberg-spring-conflict-
> resolution-00.txt
>=20
>=20
> A new version of I-D, draft-ginsberg-spring-conflict-resolution-00.txt
> has been successfully submitted by Les Ginsberg and posted to the IETF
> repository.
>=20
> Name:		draft-ginsberg-spring-conflict-resolution
> Revision:	00
> Title:		Segment Routing Conflict Resolution
> Document date:	2015-10-14
> Group:		Individual Submission
> Pages:		14
> URL:            https://www.ietf.org/internet-drafts/draft-ginsberg-sprin=
g-conflict-
> resolution-00.txt
> Status:         https://datatracker.ietf.org/doc/draft-ginsberg-spring-co=
nflict-
> resolution/
> Htmlized:       https://tools.ietf.org/html/draft-ginsberg-spring-conflic=
t-
> resolution-00
>=20
>=20
> Abstract:
>    In support of Segment Routing (SR) routing protocols advertise a
>    variety of identifiers used to define the segments which direct
>    forwarding of packets.  In cases where the information advertised by
>    a given protocol instance is either internally inconsistent or
>    conflicts with advertisements from another protocol instance a means
>    of achieving consistent forwarding behavior in the network is
>    required.  This document defines the policies used to resolve these
>    occurrences.
>=20
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> The IETF Secretariat
>=20
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring

___________________________________________________________________________=
______________________________________________

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Thread-Topic: New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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Bruno -

In Section 3.2.5 of the draft:

" ...   For other sources, It may seem intuitive to assign priority based o=
n
   point of origination (e.g. intra-area preferred over inter-area,
   prefix reachability advertisements preferred over SRMS
   advertisements, etc.).  However, any such policy makes it more likely
   that inconsistent choices will be made by routers in the network and
   increase the likelihood of forwarding loops or blackholes."

If this point is agreed to then changes to the IGP drafts - such as the IS-=
IS SR draft section that you quoted (actually Section 2.4.5 of that draft) =
- would be necessary.

So yes - it is our intent to have the protocol drafts changed if the confli=
ct resolution language in this area is accepted.

   Les


> -----Original Message-----
> From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
> Sent: Thursday, October 22, 2015 9:00 AM
> To: Les Ginsberg (ginsberg)
> Cc: spring@ietf.org
> Subject: RE: New Version Notification for draft-ginsberg-spring-conflict-
> resolution-00.txt
>=20
> Les,
>=20
> As an individual contributor, I have a clarification question regarding S=
egment
> Identifier Conflicts
> https://tools.ietf.org/html/draft-ginsberg-spring-conflict-resolution-
> 00#section-3
>=20
> In the IGP, (Prefix, SID) mapping may be advertised via either Prefix-SID
> (sub-TLV attached to an IP Prefix) or Mapping Server (Mapping Server Pref=
ix-
> SID in the Binding TLV).
> The draft generalizes both by defining and using a generalized mapping
> entry.
> Hence the draft seems to make no distinction between Prefix-SID and
> Remote-Binding SID advertised by the Mapping Server. Is this a correct
> understanding?
>=20
> OTOH, the "IS-IS Extensions for Segment Routing" IS-IS WG draft, specify
> that a distinction must be made:
> "   For a given prefix, if both a MS entry with its Prefix-SID Sub-TLV
>    and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, the
>    Prefix-SID advertised within the Prefix TLV MUST be preferred while
>    the MS entry MUST be ignored."
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06#section-
> 3.6.1
>=20
> So is your intention to:
> - change the IS-IS specification to remove this rule (preference for Pref=
ix-SID
> Sub-TLV)?
> - or adapt your draft to accommodate for this rule?
>=20
> Thanks,
> Regards,
> Bruno
>=20
> > From: Les Ginsberg (ginsberg) > Sent: Wednesday, October 14, 2015 8:44
> > PM Folks -
> >
> > Would like to call your attention to this new draft.
> >
> >    Les
> >
> > -----Original Message-----
> > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > Sent: Wednesday, October 14, 2015 10:57 AM
> > To: Peter Psenak (ppsenak); Les Ginsberg (ginsberg); Stefano Previdi
> > (sprevidi)
> > Subject: New Version Notification for draft-ginsberg-spring-conflict-
> > resolution-00.txt
> >
> >
> > A new version of I-D, draft-ginsberg-spring-conflict-resolution-00.txt
> > has been successfully submitted by Les Ginsberg and posted to the IETF
> > repository.
> >
> > Name:		draft-ginsberg-spring-conflict-resolution
> > Revision:	00
> > Title:		Segment Routing Conflict Resolution
> > Document date:	2015-10-14
> > Group:		Individual Submission
> > Pages:		14
> > URL:            https://www.ietf.org/internet-drafts/draft-ginsberg-spr=
ing-
> conflict-
> > resolution-00.txt
> > Status:         https://datatracker.ietf.org/doc/draft-ginsberg-spring-=
conflict-
> > resolution/
> > Htmlized:       https://tools.ietf.org/html/draft-ginsberg-spring-confl=
ict-
> > resolution-00
> >
> >
> > Abstract:
> >    In support of Segment Routing (SR) routing protocols advertise a
> >    variety of identifiers used to define the segments which direct
> >    forwarding of packets.  In cases where the information advertised by
> >    a given protocol instance is either internally inconsistent or
> >    conflicts with advertisements from another protocol instance a means
> >    of achieving consistent forwarding behavior in the network is
> >    required.  This document defines the policies used to resolve these
> >    occurrences.
> >
> >
> >
> >
> >
> > Please note that it may take a couple of minutes from the time of
> > submission until the htmlized version and diff are available at tools.i=
etf.org.
> >
> > The IETF Secretariat
> >
> > _______________________________________________
> > spring mailing list
> > spring@ietf.org
> > https://www.ietf.org/mailman/listinfo/spring
>=20
> __________________________________________________________
> __________________________________________________________
> _____
>=20
> Ce message et ses pieces jointes peuvent contenir des informations
> confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exp=
loites
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Subject: [spring] Comments on draft-ietf-idr-bgp-prefix-sid-01
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I'd like to make some suggestions for textual changes to sections 3.1 and
4.3 of draft-ietf-idr-prefix-sid.  The main purpose of these suggestions is
to clarify the use of the Originator SRGB TLV, and to remove what I
think is an excessive and distracting amount of repetition about the
inadvisability of allowing different nodes to use different SRGBs.

My proposal for the text of these sections follows.  In addition to the
changes I mentioned above, some typos in the original text are fixed, and
there is a suggestion (explained below in brackets) for slightly modifying
the text about the AFI/SAFIs with which the Prefix-SID attribute may be
used.  A few other explanations can be found in brackets below inside the
proposed text.

--------------------

3.1.  MPLS Prefix Segment

    In this document, we specify "MPLS Prefix Segments" only for BGP routes
    that have an AFI/SAFI of 1/4 or 2/4.  The applicability of MPLS prefix
    segments to other AFI/SAFIs is outside the scope of this document.

[The original text said "A Multiprotocol BGP labeled IPv4/IPv6 Unicast
([RFC3107]) session type is required", I don't think that is quite precise.
If a session has multiple AFI/SAFIs, including 1/4, I don't think we 
want to
say that the attribute can be placed in any UPDATE on that session.  Also,
it's not quite accurate to say that RFC3107 is restricted to 1/4 and 2/4;
RFC3107 doesn't mention the AFI.  And we may want to leave it open that the
Prefix Segment notion may eventually be applied somehow to SAFI-128 
routes.]

    The BGP Prefix Segment is realized on the MPLS dataplane in the
    following way:

       As described in [I-D.ietf-spring-segment-routing-msdc] the
       operator assigns a globally unique "index", L_I, to a locally
       sourced prefix of a BGP speaker N which is advertised to all other
       BGP speakers in the SR domain.

       According to [I-D.ietf-spring-segment-routing], each BGP speaker
       is configured with a label block called the Segment Routing Global
       Block (SRGB).  (While it is recommended to use the same SRGB across
       all the nodes within the SR domain, the SRGB of a node is a local
       property and could be different on different speakers).

       The index L_I is a 32 bit offset in the SRGB.  Each BGP speaker
       derives its local MPLS label, L, by adding L_I to the start value
       of its own SRGB, and programs L in its MPLS dataplane as its
       incoming/local label for the prefix.  (See section 5.1 for more
       details.)

[Added reference to section 5.1.]

       The outgoing label for the prefix is found in the NLRI of the
       Multiprotocol BGP labeled IPv4/IPv6 Unicast prefix advertisement.
       The index L_I is only used as a hint to derive the local/incoming
       label.

    Section 4.1 of this document specifies the Label-Index TLV of the BGP
    Prefix-SID attribute; this TLV can be used to advertise the label index
    of a given prefix.

    If the BGP speakers are not all configured with the same SRGB, and if
    traffic-engineering within the SR domain is required, each node may be
    required to advertise its local SRGB.  One way of advertising the local
    SRGB is to use the segment routing extensions of BGP-LS
    (draft-gredler-idr-bgp-ls-segment-routing-ext-00.txt). An alternative
    option is to use the Originator SRGB TLV of the prefix-SID 
attribute, as
    specified in Section 4.3 of this document.

[Rearranged last paragraphs slightly to improve flow, imo.]



4.3.  Originator SRGB TLV

    The Originator SRGB TLV is an optional TLV and has the following
    format:

      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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Type      |          Length               | Flags      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Flags     |
     +-+-+-+-+-+-+-+-+

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         SRGB 1 (6 octets)                                     |
     | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         SRGB n (6 octets)                                     |
     | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

[I can rarely get the ascii art to render correctly, but the diagram above
is supposed to be unchanged from what appears in the draft.]

    where:

    o  Type is 3.

    o  Length is the total length of the value portion of the TLV: 2 +
       multiple of 6.

    o  Flags: 16 bits of flags.  None are defined in this document.
       Flags SHOULD be clear on transmission and MUST be ignored at
       reception.

    o  SRGB: 3 octets of base followed by 3 octets of range.  Note that the
       SRGB field MAY appear multiple times.  If the SRGB field appears
       multiple times, the SRGB consists of multiple ranges.  The 
meaning of
       an SRGB with multiple ranges is explained in Section 3.2 ("SID/Label
       Range TLV") of [I-D.ietf-ospf-segment-routing-extensions].

[Added some text about the semantics of the SRGB field appearing multiple
times, with reference to a document that actually explains it.]

    When a BGP speaker attaches a Prefix-SID attribute to a given route, 
the
    Originator SRGB TLV MUST NOT be included in the attribute unless the
    following conditions hold:

    - The prefix field of the route's NLRI contains a host address (i.e., a
      /32 IPv4 address or a /128 IPv6 address).

    - The value of the Originator SRGB TLV specifies the SRGB of the node
      that is identified by the prefix field of the NLRI.

[This paragraph and bullet items are added in order to make clear just what
the semantics of the TLV are.]

    If a BGP route is received that contains a Prefix-SID attribute with an
    Originator SRGB TLV, but the prefix field of the NLRI does not 
contain a
    host address, the attribute SHOULD be regarded as malformed. If a
    Prefix-SID attribute contains more than one SRGB TLV, it SHOULD be
    regarded as malformed.  See section 7 for the treatment of a malformed
    Prefix-SID attribute.

    When a route carrying the Prefix-SID attribute is propagated, the
    Originator SRGB TLV (if present) MUST NOT be changed.

-----------------




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<html>
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    <meta http-equiv="content-type" content="text/html; charset=utf-8">
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  <body bgcolor="#FFFFFF" text="#000000">
    <div class="moz-text-flowed" style="font-family: -moz-fixed;
      font-size: 14px;" lang="x-unicode">I'd like to make some
      suggestions for textual changes to sections 3.1 and
      <br>
      4.3 of draft-ietf-idr-prefix-sid.Â  The main purpose of these
      suggestions is
      <br>
      to clarify the use of the Originator SRGB TLV, and to remove what
      I
      <br>
      think is an excessive and distracting amount of repetition about
      the
      <br>
      inadvisability of allowing different nodes to use different SRGBs.
      <br>
      <br>
      My proposal for the text of these sections follows.Â  In addition
      to the
      <br>
      changes I mentioned above, some typos in the original text are
      fixed, and
      <br>
      there is a suggestion (explained below in brackets) for slightly
      modifying
      <br>
      the text about the AFI/SAFIs with which the Prefix-SID attribute
      may be
      <br>
      used.Â  A few other explanations can be found in brackets below
      inside the
      <br>
      proposed text.
      <br>
      <br>
      --------------------
      <br>
      <br>
      3.1.Â  MPLS Prefix Segment
      <br>
      <br>
      Â Â  In this document, we specify "MPLS Prefix Segments" only for
      BGP routes
      <br>
      Â Â  that have an AFI/SAFI of 1/4 or 2/4.Â  The applicability of MPLS
      prefix
      <br>
      Â Â  segments to other AFI/SAFIs is outside the scope of this
      document.
      <br>
      <br>
      [The original text said "A Multiprotocol BGP labeled IPv4/IPv6
      Unicast
      <br>
      ([RFC3107]) session type is required", I don't think that is quite
      precise.
      <br>
      If a session has multiple AFI/SAFIs, including 1/4, I don't think
      we want to
      <br>
      say that the attribute can be placed in any UPDATE on that
      session.Â  Also,
      <br>
      it's not quite accurate to say that RFC3107 is restricted to 1/4
      and 2/4;
      <br>
      RFC3107 doesn't mention the AFI.Â  And we may want to leave it open
      that the
      <br>
      Prefix Segment notion may eventually be applied somehow to
      SAFI-128 routes.]
      <br>
      <br>
      Â Â  The BGP Prefix Segment is realized on the MPLS dataplane in the
      <br>
      Â Â  following way:
      <br>
      <br>
      Â Â Â Â Â  As described in [I-D.ietf-spring-segment-routing-msdc] the
      <br>
      Â Â Â Â Â  operator assigns a globally unique "index", L_I, to a
      locally
      <br>
      Â Â Â Â Â  sourced prefix of a BGP speaker N which is advertised to all
      other
      <br>
      Â Â Â Â Â  BGP speakers in the SR domain.
      <br>
      <br>
      Â Â Â Â Â  According to [I-D.ietf-spring-segment-routing], each BGP
      speaker
      <br>
      Â Â Â Â Â  is configured with a label block called the Segment Routing
      Global
      <br>
      Â Â Â Â Â  Block (SRGB).Â  (While it is recommended to use the same SRGB
      across
      <br>
      Â Â Â Â Â  all the nodes within the SR domain, the SRGB of a node is a
      local
      <br>
      Â Â Â Â Â  property and could be different on different speakers).
      <br>
      <br>
      Â Â Â Â Â  The index L_I is a 32 bit offset in the SRGB.Â  Each BGP
      speaker
      <br>
      Â Â Â Â Â  derives its local MPLS label, L, by adding L_I to the start
      value
      <br>
      Â Â Â Â Â  of its own SRGB, and programs L in its MPLS dataplane as its
      <br>
      Â Â Â Â Â  incoming/local label for the prefix.Â  (See section 5.1 for
      more
      <br>
      Â Â Â Â Â  details.)
      <br>
      <br>
      [Added reference to section 5.1.]
      <br>
      <br>
      Â Â Â Â Â  The outgoing label for the prefix is found in the NLRI of
      the
      <br>
      Â Â Â Â Â  Multiprotocol BGP labeled IPv4/IPv6 Unicast prefix
      advertisement.
      <br>
      Â Â Â Â Â  The index L_I is only used as a hint to derive the
      local/incoming
      <br>
      Â Â Â Â Â  label.
      <br>
      <br>
      Â Â  Section 4.1 of this document specifies the Label-Index TLV of
      the BGP
      <br>
      Â Â  Prefix-SID attribute; this TLV can be used to advertise the
      label index
      <br>
      Â Â  of a given prefix.
      <br>
      <br>
      Â Â  If the BGP speakers are not all configured with the same SRGB,
      and if
      <br>
      Â Â  traffic-engineering within the SR domain is required, each node
      may be
      <br>
      Â Â  required to advertise its local SRGB.Â  One way of advertising
      the local
      <br>
      Â Â  SRGB is to use the segment routing extensions of BGP-LS
      <br>
      Â Â  (draft-gredler-idr-bgp-ls-segment-routing-ext-00.txt). An
      alternative
      <br>
      Â Â  option is to use the Originator SRGB TLV of the prefix-SID
      attribute, as
      <br>
      Â Â  specified in Section 4.3 of this document.
      <br>
      <br>
      [Rearranged last paragraphs slightly to improve flow, imo.]
      <br>
      <br>
      <br>
      <br>
      4.3.Â  Originator SRGB TLV
      <br>
      <br>
      Â Â  The Originator SRGB TLV is an optional TLV and has the
      following
      <br>
      Â Â  format:
      <br>
      <br>
      Â Â Â Â  0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  1 2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  3
      <br>
      Â Â Â Â  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
      <br>
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      Â Â Â  |Â Â Â Â  TypeÂ Â Â Â Â  |Â Â Â Â Â Â Â Â Â  LengthÂ Â Â Â Â Â Â Â Â Â Â Â Â Â  | FlagsÂ Â Â Â Â  |
      <br>
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      Â Â Â  |Â Â Â Â  FlagsÂ Â Â Â  |
      <br>
      Â Â Â  +-+-+-+-+-+-+-+-+
      <br>
      <br>
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      Â Â Â  |Â Â Â Â Â Â Â Â  SRGB 1 (6
      octets)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  |
      <br>
      Â Â Â  | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      Â Â Â  |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  |
      <br>
      Â Â Â  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      <br>
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      Â Â Â  |Â Â Â Â Â Â Â Â  SRGB n (6
      octets)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  |
      <br>
      Â Â Â  | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      Â Â Â  |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  |
      <br>
      Â Â Â  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      <br>
      <br>
      [I can rarely get the ascii art to render correctly, but the
      diagram above
      <br>
      is supposed to be unchanged from what appears in the draft.]
      <br>
      <br>
      Â Â  where:
      <br>
      <br>
      Â Â  oÂ  Type is 3.
      <br>
      <br>
      Â Â  oÂ  Length is the total length of the value portion of the TLV:
      2 +
      <br>
      Â Â Â Â Â  multiple of 6.
      <br>
      <br>
      Â Â  oÂ  Flags: 16 bits of flags.Â  None are defined in this document.
      <br>
      Â Â Â Â Â  Flags SHOULD be clear on transmission and MUST be ignored at
      <br>
      Â Â Â Â Â  reception.
      <br>
      <br>
      Â Â  oÂ  SRGB: 3 octets of base followed by 3 octets of range.Â  Note
      that the
      <br>
      Â Â Â Â Â  SRGB field MAY appear multiple times.Â  If the SRGB field
      appears
      <br>
      Â Â Â Â Â  multiple times, the SRGB consists of multiple ranges.Â  The
      meaning of
      <br>
      Â Â Â Â Â  an SRGB with multiple ranges is explained in Section 3.2
      ("SID/Label
      <br>
      Â Â Â Â Â  Range TLV") of [I-D.ietf-ospf-segment-routing-extensions].
      <br>
      <br>
      [Added some text about the semantics of the SRGB field appearing
      multiple
      <br>
      times, with reference to a document that actually explains it.]
      <br>
      <br>
      Â Â  When a BGP speaker attaches a Prefix-SID attribute to a given
      route, the
      <br>
      Â Â  Originator SRGB TLV MUST NOT be included in the attribute
      unless the
      <br>
      Â Â  following conditions hold:
      <br>
      <br>
      Â Â  - The prefix field of the route's NLRI contains a host address
      (i.e., a
      <br>
      Â Â Â Â  /32 IPv4 address or a /128 IPv6 address).
      <br>
      <br>
      Â Â  - The value of the Originator SRGB TLV specifies the SRGB of
      the node
      <br>
      Â Â Â Â  that is identified by the prefix field of the NLRI.
      <br>
      <br>
      [This paragraph and bullet items are added in order to make clear
      just what
      <br>
      the semantics of the TLV are.]
      <br>
      <br>
      Â Â  If a BGP route is received that contains a Prefix-SID attribute
      with an
      <br>
      Â Â  Originator SRGB TLV, but the prefix field of the NLRI does not
      contain a
      <br>
      Â Â  host address, the attribute SHOULD be regarded as malformed. If
      a
      <br>
      Â Â  Prefix-SID attribute contains more than one SRGB TLV, it SHOULD
      be
      <br>
      Â Â  regarded as malformed.Â  See section 7 for the treatment of a
      malformed
      <br>
      Â Â  Prefix-SID attribute.
      <br>
      <br>
      Â Â  When a route carrying the Prefix-SID attribute is propagated,
      the
      <br>
      Â Â  Originator SRGB TLV (if present) MUST NOT be changed.
      <br>
      <br>
      -----------------
      <br>
      <br>
      <br>
      <br>
    </div>
  </body>
</html>

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Les,=20

Mapping Server (MS) is typically deployed in brown field deployments where =
some routers are not (yet) Segment Routing (SR) compliant, i.e. LDP only.
In this scenario, the MS advertises the SIDs for the whole range of router'=
s loopback.  The SR routers also advertise their own SID in Prefix-SID sub-=
TLV attached to their loopback. Hence, in the nominal situation, SIDs are a=
dvertised both by loopback owners and by the MS.

In this situation, with a _single_ erroneous advertisement from the MS (e.g=
. a typo from an operator or a software bug) _all_ the SID/Segments in the =
network becomes in conflict.
draft-ginsberg-spring-conflict-resolution proposes 2 options:
a) ignore the SID in conflict
b) select one based on a tie-breaker

"a" would result in all SID/Segments of the network to become invalidated. =
i.e. breaking the whole MPLS network. In my view, this is not a desirable r=
eaction, especially in reaction to a single error.
"b" seems better. Yet the tie-breaker does not make a distinction between P=
refix-SID sub-TLV and MS advertisement. IMO Prefix-SID sub-TLV should be pr=
ivileged for 2 reasons:
- To learn a data from (node) X, I'd rather trust X itself rather than Y. E=
specially from X point of view. (IOW, let me speak for myself)
- Prefix-SID sub-TLV advertises  a single SID while MS advertise many. Assu=
ming a single error (which seems reasonable as the network was running corr=
ectly before), it seems less risky to take the risk for a single SID rather=
 than for the whole MS advertisement.


That is also the opinion of draft-ietf-isis-segment-routing-extensions whic=
h already specify this behavior:
   For a given prefix, if both a MS entry with its Prefix-SID Sub-TLV
   and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, the
   Prefix-SID advertised within the Prefix TLV MUST be preferred while
   the MS entry MUST be ignored.


Bottom line, I don't understand why you are proposing to change this specif=
ication. Could you please elaborate on your reasons and challenge mines as =
needed?

Thanks,
Regards;
Bruno

> From: Les Ginsberg > Sent: Thursday, October 22, 2015 9:21 PM
>=20
> Bruno -
>=20
> In Section 3.2.5 of the draft:
>=20
> " ...   For other sources, It may seem intuitive to assign priority based=
 on
>    point of origination (e.g. intra-area preferred over inter-area,
>    prefix reachability advertisements preferred over SRMS
>    advertisements, etc.).  However, any such policy makes it more likely
>    that inconsistent choices will be made by routers in the network and
>    increase the likelihood of forwarding loops or blackholes."
>=20
> If this point is agreed to then changes to the IGP drafts - such as the I=
S-IS SR
> draft section that you quoted (actually Section 2.4.5 of that draft) - wo=
uld be
> necessary.
>=20
> So yes - it is our intent to have the protocol drafts changed if the conf=
lict
> resolution language in this area is accepted.
>=20
>    Les
>=20
>=20
> > -----Original Message-----
> > From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
> > Sent: Thursday, October 22, 2015 9:00 AM
> > To: Les Ginsberg (ginsberg)
> > Cc: spring@ietf.org
> > Subject: RE: New Version Notification for draft-ginsberg-spring-conflic=
t-
> > resolution-00.txt
> >
> > Les,
> >
> > As an individual contributor, I have a clarification question regarding
> Segment
> > Identifier Conflicts
> > https://tools.ietf.org/html/draft-ginsberg-spring-conflict-resolution-
> > 00#section-3
> >
> > In the IGP, (Prefix, SID) mapping may be advertised via either Prefix-S=
ID
> > (sub-TLV attached to an IP Prefix) or Mapping Server (Mapping Server
> Prefix-
> > SID in the Binding TLV).
> > The draft generalizes both by defining and using a generalized mapping
> > entry.
> > Hence the draft seems to make no distinction between Prefix-SID and
> > Remote-Binding SID advertised by the Mapping Server. Is this a correct
> > understanding?
> >
> > OTOH, the "IS-IS Extensions for Segment Routing" IS-IS WG draft, specify
> > that a distinction must be made:
> > "   For a given prefix, if both a MS entry with its Prefix-SID Sub-TLV
> >    and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, the
> >    Prefix-SID advertised within the Prefix TLV MUST be preferred while
> >    the MS entry MUST be ignored."
> > https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06#sectio=
n-
> > 3.6.1
> >
> > So is your intention to:
> > - change the IS-IS specification to remove this rule (preference for Pr=
efix-
> SID
> > Sub-TLV)?
> > - or adapt your draft to accommodate for this rule?
> >
> > Thanks,
> > Regards,
> > Bruno
> >
> > > From: Les Ginsberg (ginsberg) > Sent: Wednesday, October 14, 2015 8:44
> > > PM Folks -
> > >
> > > Would like to call your attention to this new draft.
> > >
> > >    Les
> > >
> > > -----Original Message-----
> > > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > > Sent: Wednesday, October 14, 2015 10:57 AM
> > > To: Peter Psenak (ppsenak); Les Ginsberg (ginsberg); Stefano Previdi
> > > (sprevidi)
> > > Subject: New Version Notification for draft-ginsberg-spring-conflict-
> > > resolution-00.txt
> > >
> > >
> > > A new version of I-D, draft-ginsberg-spring-conflict-resolution-00.txt
> > > has been successfully submitted by Les Ginsberg and posted to the IETF
> > > repository.
> > >
> > > Name:		draft-ginsberg-spring-conflict-resolution
> > > Revision:	00
> > > Title:		Segment Routing Conflict Resolution
> > > Document date:	2015-10-14
> > > Group:		Individual Submission
> > > Pages:		14
> > > URL:            https://www.ietf.org/internet-drafts/draft-ginsberg-s=
pring-
> > conflict-
> > > resolution-00.txt
> > > Status:         https://datatracker.ietf.org/doc/draft-ginsberg-sprin=
g-conflict-
> > > resolution/
> > > Htmlized:       https://tools.ietf.org/html/draft-ginsberg-spring-con=
flict-
> > > resolution-00
> > >
> > >
> > > Abstract:
> > >    In support of Segment Routing (SR) routing protocols advertise a
> > >    variety of identifiers used to define the segments which direct
> > >    forwarding of packets.  In cases where the information advertised =
by
> > >    a given protocol instance is either internally inconsistent or
> > >    conflicts with advertisements from another protocol instance a mea=
ns
> > >    of achieving consistent forwarding behavior in the network is
> > >    required.  This document defines the policies used to resolve these
> > >    occurrences.
> > >
> > >
> > >
> > >
> > >
> > > Please note that it may take a couple of minutes from the time of
> > > submission until the htmlized version and diff are available at tools=
.ietf.org.
> > >
> > > The IETF Secretariat
> > >
> > > _______________________________________________
> > > spring mailing list
> > > spring@ietf.org
> > > https://www.ietf.org/mailman/listinfo/spring
> >
> > __________________________________________________________
> > __________________________________________________________
> > _____
> >
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 Les
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> > Thank you.


___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
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France Telecom - Orange decline toute responsabilite si ce message a ete al=
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Thread-Topic: New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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Bruno -

When there is a conflict, the problem with trying to decide which advertise=
ment should be preferred is that there really is no way of knowing with cer=
tainty which advertisement is the correct one. You have made certain assump=
tions below as to what is the most advantageous preference - and in a given=
 scenario your assumptions may be quite reasonable. But here is an alternat=
e scenario where I think different assumptions could be made with an equal =
justification.

Again consider a brown field deployment. SRMS is used to advertise SIDs for=
 those nodes which are not yet SR capable. So, for Node X which has a Node =
address of 1.1.1.1 SRMS might advertise:

   1.1.1.1/32 100 range 1

This in fact is the correct value and all is working well.

At some point Node X gets upgraded to become SR capable. Part of the new co=
nfiguration is to assign the SID locally, but in doing so the operator make=
s an error and configures:

    1.1.1.1/32 200 range 1

Because the operator wants to do "make before break" the SRMS advertisement=
 is NOT removed when Node X is upgraded (there should be no rush to do so) =
- so we have a conflict. Using your logic below, network would switch to us=
ing SID 200 for 1.1.1.1/32 - which in fact is the wrong choice.

I think this scenario is just as plausible as the scenario you presented.

You also seems to suggest that SRMS advertisements are far more likely to h=
ave ranges greater than 1, something like:

   1.1.1.1/32 100 range 100

but I think this assumption is questionable. For this to work, the followin=
g things have to be true:

1)A significant set of the node addresses in the network have to fit within=
 the defined range
2)All the SIDs which are assigned (even locally) need to follow a monotonic=
ally increasing mapping of address-to-SID

There may be networks where the above constraints will be met - but I have =
seen enough deployments w irregular address assignments not to expect such =
regularity.

I am not saying you are wrong - I am saying we can all come up with cases w=
here a given set of rules offers advantages - but as there are many sets of=
 optimal rules depending on how your network is deployed/upgraded - any arg=
ument of this type is simply unresolvable. Every answer is advantageous und=
er one set of conditions and disadvantageous under another set.

HTH

    Les



> -----Original Message-----
> From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
> Sent: Friday, October 23, 2015 1:05 AM
> To: Les Ginsberg (ginsberg)
> Cc: spring@ietf.org
> Subject: RE: New Version Notification for draft-ginsberg-spring-conflict-
> resolution-00.txt
>=20
> Les,
>=20
> Mapping Server (MS) is typically deployed in brown field deployments wher=
e
> some routers are not (yet) Segment Routing (SR) compliant, i.e. LDP only.
> In this scenario, the MS advertises the SIDs for the whole range of route=
r's
> loopback.  The SR routers also advertise their own SID in Prefix-SID sub-=
TLV
> attached to their loopback. Hence, in the nominal situation, SIDs are
> advertised both by loopback owners and by the MS.
>=20
> In this situation, with a _single_ erroneous advertisement from the MS (e=
.g.
> a typo from an operator or a software bug) _all_ the SID/Segments in the
> network becomes in conflict.
> draft-ginsberg-spring-conflict-resolution proposes 2 options:
> a) ignore the SID in conflict
> b) select one based on a tie-breaker
>=20
> "a" would result in all SID/Segments of the network to become invalidated=
.
> i.e. breaking the whole MPLS network. In my view, this is not a desirable
> reaction, especially in reaction to a single error.
> "b" seems better. Yet the tie-breaker does not make a distinction between
> Prefix-SID sub-TLV and MS advertisement. IMO Prefix-SID sub-TLV should be
> privileged for 2 reasons:
> - To learn a data from (node) X, I'd rather trust X itself rather than Y.
> Especially from X point of view. (IOW, let me speak for myself)
> - Prefix-SID sub-TLV advertises  a single SID while MS advertise many.
> Assuming a single error (which seems reasonable as the network was
> running correctly before), it seems less risky to take the risk for a sin=
gle SID
> rather than for the whole MS advertisement.
>=20
>=20
> That is also the opinion of draft-ietf-isis-segment-routing-extensions wh=
ich
> already specify this behavior:
>    For a given prefix, if both a MS entry with its Prefix-SID Sub-TLV
>    and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, the
>    Prefix-SID advertised within the Prefix TLV MUST be preferred while
>    the MS entry MUST be ignored.
>=20
>=20
> Bottom line, I don't understand why you are proposing to change this
> specification. Could you please elaborate on your reasons and challenge
> mines as needed?
>=20
> Thanks,
> Regards;
> Bruno
>=20
> > From: Les Ginsberg > Sent: Thursday, October 22, 2015 9:21 PM
> >
> > Bruno -
> >
> > In Section 3.2.5 of the draft:
> >
> > " ...   For other sources, It may seem intuitive to assign priority bas=
ed on
> >    point of origination (e.g. intra-area preferred over inter-area,
> >    prefix reachability advertisements preferred over SRMS
> >    advertisements, etc.).  However, any such policy makes it more likel=
y
> >    that inconsistent choices will be made by routers in the network and
> >    increase the likelihood of forwarding loops or blackholes."
> >
> > If this point is agreed to then changes to the IGP drafts - such as
> > the IS-IS SR draft section that you quoted (actually Section 2.4.5 of
> > that draft) - would be necessary.
> >
> > So yes - it is our intent to have the protocol drafts changed if the
> > conflict resolution language in this area is accepted.
> >
> >    Les
> >
> >
> > > -----Original Message-----
> > > From: bruno.decraene@orange.com
> [mailto:bruno.decraene@orange.com]
> > > Sent: Thursday, October 22, 2015 9:00 AM
> > > To: Les Ginsberg (ginsberg)
> > > Cc: spring@ietf.org
> > > Subject: RE: New Version Notification for
> > > draft-ginsberg-spring-conflict- resolution-00.txt
> > >
> > > Les,
> > >
> > > As an individual contributor, I have a clarification question
> > > regarding
> > Segment
> > > Identifier Conflicts
> > > https://tools.ietf.org/html/draft-ginsberg-spring-conflict-resolutio
> > > n-
> > > 00#section-3
> > >
> > > In the IGP, (Prefix, SID) mapping may be advertised via either
> > > Prefix-SID (sub-TLV attached to an IP Prefix) or Mapping Server
> > > (Mapping Server
> > Prefix-
> > > SID in the Binding TLV).
> > > The draft generalizes both by defining and using a generalized
> > > mapping entry.
> > > Hence the draft seems to make no distinction between Prefix-SID and
> > > Remote-Binding SID advertised by the Mapping Server. Is this a
> > > correct understanding?
> > >
> > > OTOH, the "IS-IS Extensions for Segment Routing" IS-IS WG draft,
> > > specify that a distinction must be made:
> > > "   For a given prefix, if both a MS entry with its Prefix-SID Sub-TL=
V
> > >    and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, =
the
> > >    Prefix-SID advertised within the Prefix TLV MUST be preferred whil=
e
> > >    the MS entry MUST be ignored."
> > > https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06#sec
> > > tion-
> > > 3.6.1
> > >
> > > So is your intention to:
> > > - change the IS-IS specification to remove this rule (preference for
> > > Prefix-
> > SID
> > > Sub-TLV)?
> > > - or adapt your draft to accommodate for this rule?
> > >
> > > Thanks,
> > > Regards,
> > > Bruno
> > >
> > > > From: Les Ginsberg (ginsberg) > Sent: Wednesday, October 14, 2015
> > > > 8:44 PM Folks -
> > > >
> > > > Would like to call your attention to this new draft.
> > > >
> > > >    Les
> > > >
> > > > -----Original Message-----
> > > > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > > > Sent: Wednesday, October 14, 2015 10:57 AM
> > > > To: Peter Psenak (ppsenak); Les Ginsberg (ginsberg); Stefano
> > > > Previdi
> > > > (sprevidi)
> > > > Subject: New Version Notification for
> > > > draft-ginsberg-spring-conflict- resolution-00.txt
> > > >
> > > >
> > > > A new version of I-D,
> > > > draft-ginsberg-spring-conflict-resolution-00.txt
> > > > has been successfully submitted by Les Ginsberg and posted to the
> > > > IETF repository.
> > > >
> > > > Name:		draft-ginsberg-spring-conflict-resolution
> > > > Revision:	00
> > > > Title:		Segment Routing Conflict Resolution
> > > > Document date:	2015-10-14
> > > > Group:		Individual Submission
> > > > Pages:		14
> > > > URL:            https://www.ietf.org/internet-drafts/draft-ginsberg=
-spring-
> > > conflict-
> > > > resolution-00.txt
> > > > Status:         https://datatracker.ietf.org/doc/draft-ginsberg-spr=
ing-
> conflict-
> > > > resolution/
> > > > Htmlized:       https://tools.ietf.org/html/draft-ginsberg-spring-c=
onflict-
> > > > resolution-00
> > > >
> > > >
> > > > Abstract:
> > > >    In support of Segment Routing (SR) routing protocols advertise a
> > > >    variety of identifiers used to define the segments which direct
> > > >    forwarding of packets.  In cases where the information advertise=
d by
> > > >    a given protocol instance is either internally inconsistent or
> > > >    conflicts with advertisements from another protocol instance a m=
eans
> > > >    of achieving consistent forwarding behavior in the network is
> > > >    required.  This document defines the policies used to resolve th=
ese
> > > >    occurrences.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Please note that it may take a couple of minutes from the time of
> > > > submission until the htmlized version and diff are available at
> tools.ietf.org.
> > > >
> > > > The IETF Secretariat
> > > >
> > > > _______________________________________________
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> > > > https://www.ietf.org/mailman/listinfo/spring
> > >
> > >
> __________________________________________________________
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> __________________________________________________________
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> Ce message et ses pieces jointes peuvent contenir des informations
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loites
> ou copies sans autorisation. Si vous avez recu ce message par erreur, veu=
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> le signaler a l'expediteur et le detruire ainsi que les pieces jointes. L=
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> Orange decline toute responsabilite si ce message a ete altere, deforme o=
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> information that may be protected by law; they should not be distributed,
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To: "VAN DE VELDE, Gunter (Gunter)" <gunter.van_de_velde@alcatel-lucent.com>
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Subject: Re: [spring] =?utf-8?q?=5BIdr=5D_Regarding_=22Semantics_Independent?= =?utf-8?b?IiBGbG93c3BlYy8v562U5aSNOiDnrZTlpI06IE5ldyBkcmFmdCAtIEZsb3dz?= =?utf-8?q?pec_Path_Redirect?=
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Gunter,

No one in BGP land will question that decoupling and indirection is a good
thing.

But why do you need new PATH_ID rather then just using community as a
marker ? Be it regular, extended or wide ?

Cheers,
R.
On Oct 27, 2015 10:01 AM, "VAN DE VELDE, Gunter (Gunter)" <
gunter.van_de_velde@alcatel-lucent.com> wrote:

> When configuring a PBR on a router using CLI you identify the
> =E2=80=98interesting=E2=80=99 traffic and the =E2=80=98actions=E2=80=99  =
upon the interesting traffic.
>
> PBR does not do anything for tunnel-setup or signaling=E2=80=A6 I do not =
think
> that Flowspec should be involved at all with set-up or
> tunnel initiation as there are much better solutions to achieve that goal
> in existence already. Flowspec can be used by a controller
> to signal policies, and a next to traffic conditioning instructions a
> redirect policy seems as a reasonable fit.
>
> Long story short: BGP Flowspec allows a controller to signal in a
> decoupled fashion both flow conditioning (already
> exists) and flow steering (PATH_ID) meta-data. The receiving router
> consumes this meta-data and takes based upon that
> meta-data localised decisions. Decoupling is a very powerful tool.
>
> G/
>
> From: Haoweiguo <haoweiguo@huawei.com>
> Date: Tuesday 27 October 2015 at 03:24
> To: Gunter Van de Velde <gunter.van_de_velde@alcatel-lucent.com>,
> Lizhenbin <lizhenbin@huawei.com>, Gunter Van De Velde <
> guntervandeveldecc@icloud.com>, Robert Raszuk <robert@raszuk.net>
> Cc: "idr@ietf.org" <idr@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "
> rtgwg@ietf.org" <rtgwg@ietf.org>
> Subject: RE: [Idr] Regarding "Semantics Independent" Flowspec//=E7=AD=94=
=E5=A4=8D: =E7=AD=94=E5=A4=8D:
> New draft - Flowspec Path Redirect
>
> Hi Gunter,
>
> Understood your design method is to just specify PATH_ID in flowspec
> message, and let the routers do local recursive action to select a set of
> specific tunnel(s), the tunnel and PATH_ID association should be configur=
ed
> beforehand at each router. The BGP flowspec initiator doesn't need to
> specify detail tunnel attributes, the flowspec message is tunnel semantic
> agnostic. The router local decision is totally unrestrictive, the
> validation and security seems to be hard to be controlled.
>
> In traditional BGP flowspec designing, BGP flowspec initiator specifies
> detail match fields and actions, the routers only enforce the actions
> without any flexibility for local decision. If using the traditional
> method, you worry about the complexity to specify detail tunnel attribute=
s.
>
> If the BGP flowspec initiator only cares about the redirect target IP
> address and tunnel type like NVO3, the tunnel attribute only need to
> include head-end information. The attribute can be described by draft-ros=
en-idr-tunnel-encaps-00,
> we only need to extend the draft usage for flowspec application.
>
> If the BGP flowspec initiator cares about the redirect target IP address
> and other QOS attributes such as BW, we can specify the additional
> attribute using BGP to notify the router, then the router perform local
> tunnel selection per the attribute.
>
> In summary, i think the router local decision should not be completely
> unrestrictive, the BGP flowspec initiator should specify some constraint
> tunnel attribute to restrict local tunnel selection. The most relaxing mo=
de
> is to only specify redirect target IP address. More strictly attribute
> specification will strengthen the constraint for each router's local tunn=
el
> selection. This method will faciliate the validation and security concern=
.
>
> Thanks,
>
> weiguo
>
> ------------------------------
>
> *From:* Idr [idr-bounces@ietf.org] on behalf of VAN DE VELDE, Gunter
> (Gunter) [gunter.van_de_velde@alcatel-lucent.com]
> *Sent:* Tuesday, October 27, 2015 0:47
> *To:* Lizhenbin; Gunter Van De Velde; Robert Raszuk
> *Cc:* idr@ietf.org; spring@ietf.org; rtgwg@ietf.org
> *Subject:* Re: [Idr] Regarding "Semantics Independent" Flowspec//=E7=AD=
=94=E5=A4=8D: =E7=AD=94=E5=A4=8D:
> New draft - Flowspec Path Redirect
>
> Let me just copy the answer I sent to another email I just sent to IDR:
>
> <>start snip<>
> Hi Robin,
>
> Thanks for your note.
>
> A tunnel is not always going over shortest path. Some tunnels are TE
> tunnels and are deliberately not going over a shortest path. This is
> something that draft-rosen-idr-tunnel-encaps-00 will not help to signal
> because the tunnel-encap attribute indicates tunnel parameters used by th=
e
> tail-end.
>
> If a redirect tunnel represents a particular redirect/steering service
> (better delay, less packet loss, non-SRLG, more BW, etc=E2=80=A6) then it=
 does
> become rather complex for BGP as signalling technology because a tunnel
> relationship is a unique between 'a headend' and =E2=80=98a tailed' devic=
e. It
> seems better to leave tunnel-setup to dedicated tunnel-setup mechanisms
> like PCEP, SR, etc=E2=80=A6.
>
> The draft redirect-to-PATH_ID is providing the means to signal a
> flow-based redirect/steering service, and have each recipient router
> identify using local recursion for the PATH_IDs the corresponding
> tunnels/redirect-info. This allows for tunnel setup complexity to be take=
n
> away from BGP, while at the same time BGP is doing what it is very good a=
t
> doing: "It signals a policy=E2=80=9D in reliable fashion.
>
> Kind Regards,
> G/
>
> <>send snip<>
>
> When looking at: draft-litkowski-idr-flowspec-interfaceset then find that
> this is a signalling method to identify on which interfaces the rule need=
s
> to be activated upon. It is orthogonal from Redirect-to-path.
>
> Segment Routing is a fine technology to built shortest Path and TE
> tunnels. Traffic steering is much more then redirecting to a Segment ID.
>
> Looking at the above, I see little logic in your proposal Robin.
>
> G/
>
> From: Lizhenbin <lizhenbin@huawei.com>
> Date: Monday 26 October 2015 at 17:19
> To: Gunter Van de Velde <gunter.van_de_velde@alcatel-lucent.com>, Gunter
> Van De Velde <guntervandeveldecc@icloud.com>, Robert Raszuk <
> robert@raszuk.net>
> Cc: "idr@ietf.org" <idr@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "
> spring@ietf.org" <spring@ietf.org>
> Subject: Regarding "Semantics Independent" Flowspec//=E7=AD=94=E5=A4=8D: =
=E7=AD=94=E5=A4=8D: [Idr] New
> draft - Flowspec Path Redirect
>
> Hi Folks,
>
> I think now the drafts of BGP Flowspec for redirect to VRF/IP/Tunnel keep=
s
> the traditional way to  extend BGP Flowspec to redirect to an entity with
> explicit meaning which has been defined clearly in the existing work.
>
> Now draft-vandevelde-idr-flowspec-path-redirect is to introduce the Path
> ID which can represent many forwarding entities.
> draft-litkowski-idr-flowspec-interfaceset is also to introduce the new
> =E2=80=9Cgroup ID=E2=80=9D concepts.
>
> There will be the problem how to define the path ID and group ID. In fact=
,
> my early comments proposed the suggestion that we can reuse some work of
> segment routing and generalize the concept of Segment, then it
>
> can provide a base for the abstracted view of different forwarding
> entities. In order to explain the usage, I proposed the draft
> draft-li-spring-segment-path-programming to try to explain the idea
> clearly. Since now
>
> segment ID can be the indicator of interface, node, tunnel, if we do not
> map segment ID to MPLS label or IPv6 address, it can be an identifier of
> all kinds of forwarding entities in the control plane which can be used
> outside.
>
> Please refer to the Please refer to =E2=80=9C5.  Usecases of Segment Path
> Programming=E2=80=9D of draft-li-spring-segment-path-programming:
>
> -- 5.3.  Steering Traffic without Mapping Segment to Label: This is the
> usecase to use segment ID to implement =E2=80=9Credirect to IP/Link=E2=80=
=9D.
>
> -- 5.4.  Centralized Mapping Service to Tunnels: This is the usecase to
> use segment ID to implement =E2=80=9Credirect to tunnel=E2=80=9D.
>
> If BGP Flowspec can carry multiple segment IDs which represent different
> links of nodes, it can implement =E2=80=9Credirect to interface group=E2=
=80=9D.
>
> So I think if we can consolidate work of
> draft-vandevelde-idr-flowspec-path-redirect/
> draft-litkowski-idr-flowspec-interfaceset/
> draft-li-spring-segment-path-programming to propose the draft of BGP
> Flowspec =E2=80=9CRedirect to Segment ID=E2=80=9D
>
> to implement =E2=80=9CSemantics Independent=E2=80=9D Flowspec. The existi=
ng SRGB info
> advertisement and SID allocation mechanism can be easily reused and
> enhanced to provide the base instead of defining the new idea and
> implementation of
>
> Path ID/Group ID.
>
>
>
>
>
>
>
> Best Regards,
>
> Zhenbin(Robin)
>
>
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* VAN DE VELDE, Gunter (Gunter) [
> mailto:gunter.van_de_velde@alcatel-lucent.com
> <gunter.van_de_velde@alcatel-lucent.com>]
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2015=E5=B9=B49=E6=9C=8828=E6=97=
=A5 20:29
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Lizhenbin; Gunter Van De Velde; Robert Ras=
zuk
> *=E6=8A=84=E9=80=81:* idr@ietf.org; pce@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: =E7=AD=94=E5=A4=8D: [Idr] New draft - Flowspec =
Path Redirect
>
>
>
> Dear Zhenbin,
>
>
>
> For (1.) I=E2=80=99ll compose some more text in a -01 version of the exis=
ting
> draft to document Flowspec PATH=E2=80=93ID. I assumed that it was clear w=
ith text
> already in the document, however, confusion seems to happen nevertheless.
>
>
>
> For (2.) the indirection by abstraction is the beauty of the idea and tha=
t
> is why its offering a more flexible solution then other idea's around the
> topic out there. Its an abstract forwarding indirection ID provided by BG=
P
> flow spec. Existing technology (PCE, SR, RSVP, manual-config,
> orchestration, etc=E2=80=A6) can be used to create/signal/maintain/etc th=
e
> tunnel/LSP/redirect-next-hop per application/service.
>
>
>
> The proposal draft-vandevelde-idr-flowspec-path-redirect-00
> <https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-=
00> does
> not provide a label or encap information but recipient uses localised
> redirect information from existing and fine working technologies.
>
>
>
> Btw, your statement below that only one Path-ID can be signalled is wrong
> and is to some degree documented in the existing draft.
>
>
>
> G/
>
>
>
>
>
>
>
> *From: *Lizhenbin
> *Date: *Monday 28 September 2015 13:16
> *To: *Gunter Van De Velde, Robert Raszuk
> *Cc: *"idr@ietf.org", Gunter Van de Velde, "pce@ietf.org"
> *Subject: *=E7=AD=94=E5=A4=8D: [Idr] New draft - Flowspec Path Redirect
>
>
>
> Hi Gunter and Robert,
>
> We are also doing similar work. Regarding the draft, the major concern is
> as follows:
>
> 1. What does the PATH_ID represent? Does it mean only tunnel/LSP or all
> possible forwarding path including tunnel/LSP, interface, VRF, nexthop, e=
tc?
>
> 2. How to allocate the PATH_ID for the forwarding path?
>
> We think the forwarding behavior for Flowspec is always actual forwarding
> concepts including VRF, nexthop, etc. So we proposed =E2=80=98redirect to=
 tunnel=E2=80=99
> in similar way. But for PATH_ID you proposed is another way to generalize
> all possible forwarding path. It may be a new way to define forwarding
> behavior for BGP Flowspec.
>
>
>
> Regarding redirecting tunnel, we proposed several drafts for your
> reference:
>
> -- draft-hao-idr-flowspec-nvo3-00
>
> -- draft-li-idr-mpls-path-programming-01
>
> -- draft-li-spring-tunnel-segment-00
>
> -- draft-chen-pce-pce-initiated-ip-tunnel-00
>
> -- draft-li-pce-tunnel-segment-00
>
>
>
> As Weiguo mentioned, the "redirect to Tunnel" for BGP Flowspec has been
> described briefly in draft-hao-idr-flowspec-nvo3-00. We will split it int=
o
> two drafts: 1. draft-hao-idr-flowspec-nvo3-01; 2. one independent draft t=
o
> define the "redirect to tunnel" for BGP Flowspec.
>
>
>
> For "redirect to tunnel" for BGP flowspec, in fact there can be two types
> of such behaviors:
>
> 1. Specify the tunnel type:
>
> For this behavior, we will reuse the IP tunnel types defined in
> [draft-rosen-idr-tunnel-encaps-00] and the MPLS tunnel types defined in
> [draft-li-idr-mpls-path-programming-01].
>
> 2. Specify the specific tunnel:
>
> For MPLS TE tunnel, there can be multiple MPLS TE tunnels for a specific
> destination. The tunnel type may be not enough. Then it is necessary to
> specify the specific MPLS TE tunnel through Tunnel Identifier. [RFC3209]
> defined the Tunnel Identifier for MPLS TE tunnel. PCE-initiated LSP adopt=
ed
> the Tunnel Identifier for which tunnel ID can be allocated by PCE.
> [draft-li-idr-mpls-path-programming-01] will try to reuse the tunnel
> identifier and define it in the tunnel attribute which can be used for
> "redirect to tunnel" in [draft-hao-idr-flowspec-nvo3-00].
>
> For IP tunnel, there is always only one IP forwarding path for a specific
> destination. So When define "redirect to specific IP tunnel" the nexthop
> plus the tunnel type may be enough in the existing deployment. As the
> development of IP tunnels, it may be popular to configure multiple IP
> tunnels for the specific destination. For examples we can define multiple
> MPLS-in-UDP tunnels for which the destination is same and the port number
> can be different for the purpose of ECMP. In order to cope with such
> development, [draft-chen-pce-pce-initiated-ip-tunnel-00] is proposed to
> introduce the tunnel identifier for IP tunnels for which tunnel ID can al=
so
> be allocated by PCE as the MPLS TE tunnel. It may be also reused in the
> tunnel attributes for the "redirect to tunnel".
>
>
>
> We think if it is only to think about "redirect to tunnel" for the BGP
> Flowspec there has already been much existing work and it is better to
> reuse them.
>
>
>
> In fact the existing work to specify a specific tunnel the tunnel
> identifier is a combination with the ingress address/egress address and
> tunnel ID. But for the draft
> draft-vandevelde-idr-flowspec-path-redirect-00, PATH_ID can be only one
> value to represent one tunnel. Recently we proposed the drafts
> draft-li-spring-tunnel-segment-00/ draft-li-pce-tunnel-segment-00 in whic=
h
> the segment ID/label can be allocated for a tunnel. This is also to use o=
ne
> value to represent a tunnel. Now Segment Routing has defined many types
> segments which can map to different forwarding path such as interface,
> node, tunnel, etc. From my point of view, the work to define
> Segment-ID/Label and PATH-ID for the forwarding path can be consolidated
> and incorporated in the SRPING work. If we hope to define the generalized
> concept, maybe we can define =E2=80=9CRedirect to Segment=E2=80=9D for th=
e BGP Flowspec. In
> [draft-li-idr-mpls-path-programming-01], we define the label combination
> attributes to map the service to the MPLS forwarding path. Maybe it can b=
e
> enhanced to SID stack attribute to map to general forwarding path which c=
an
> be used for multiple BGP address family including BGP Flowspec.
>
>
>
> This is about our thinking on the "redirect to tunnel/path" work. Hope to
> get your opinion on it.
>
>
>
>
>
> Best Regards,
>
> Zhenbin(Robin)
>
>
>
>
>
>
>
>
>
>
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* Idr [mailto:idr-bounces@ietf.org <idr-boun=
ces@ietf.org>] *=E4=BB=A3=E8=A1=A8 *Gunter
> Van De Velde
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2015=E5=B9=B49=E6=9C=8823=E6=97=
=A5 20:44
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Robert Raszuk
> *=E6=8A=84=E9=80=81:* idr@ietf.org; VAN DE VELDE, Gunter (Gunter)
> *=E4=B8=BB=E9=A2=98:* Re: [Idr] New draft - Flowspec Path Redirect
>
>
>
> Interresting question... I see few options to address this. (And fwiw, i
> left this currently intentionally out the text to see if some ideas pop-u=
p
> to confirm or deny the ideas the authors had on this topic)
>
> The one which currently to me resonates most is to treat the path-id
> similar as a traditional bgp next-hop address... Meaning, that if the
> receiving router does't have a "valid" entry in the locallised path-id
> table it treats flowspec rule as withdraw.
>
> Decision on what is considered "valid" is at first glance a local router
> decision.
>
> If you have another proposal i would be happy to learn and see if it
> resonates.
>
> Ciao,
> G/
>
>
>
> Sent using CloudMagic Email
> <https://cloudmagic.com/k/d/mailapp?ct=3Dpa&cv=3D7.3.5&pv=3D5.1.1&source=
=3Demail_footer_2>
>
> On Wed, Sep 23, 2015 at 10:56 AM, Robert Raszuk <robert@raszuk.net> wrote=
:
>
>
>
> Hey Gunter,
>
> Let me ask you a question (which in fact also applies to redirect to
> next hop draft).
>
> What is the expected system action when the redirect path is down
> (assuming you have tools to detect it) or next hop you are redirecting
> it to is unreachable ?
>
> I read your draft but other then definition of the encoding I was not
> able to find answers for this.
>
> The original RFC5575 recommended redirect to local VRF which is just
> as loopback normally up and within that VRF your orchestration can
> redirect to next hop or path with whatever encapsulation you like.
>
> Here you (and redirect to next hop folks) are making a shortcut
> however in both works I have not seen a proper discussion nor
> definition of set of procedures which need to be executed upon your
> redirect entity failure.
>
> I suggest both documents are updated with that before we proceed
> further with both proposals.
>
> Cheers,
> R.
>
>
>
>
> On Wed, Sep 23, 2015 at 10:18 AM, VAN DE VELDE, Gunter (Gunter)
> <gunter.van_de_velde@alcatel-lucent.com> wrote:
> > Hi Folks,
> >
> > We have created a new draft to allow the capability to have Flowspec
> signal
> > a redirect to tunnel/LSP.
> >
> >
> https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-0=
0
> >
> > The base principle is to use the indirection capability of BGP for path
> > redirection.
> >
> > This proposal defines a new flowspec community to signal a redirect
> > =E2=80=98path-id=E2=80=99. This path-id is is either a 128bit or 32bit =
value
> > Assumed is that recipient router supporting path-id redirect have a
> > localised path-id indexed table containing LSP/tunnel encapsulation
> > information.
> > Existing technology can be used to construct/create this table (LDP, SR=
,
> > RSVP, manual-config, etc=E2=80=A6) on a recipient router. The LSP/tunne=
l encap
> table
> > is indexed using 32 or 128 bit values.
> >
> > Flowspec path-id community is used to activate a redirect LSP/tunnel an=
d
> > provide by indirection the LSP/tunnel information for the flowspec
> > identified traffic towards the LSP/tunnel.
> >
> > Benefits:
> >
> > no need for signalling labels or extra encap in BGP
> > Each path-id indexed LSP/tunnel table is a localised construct
> > existing technology is used to construct the path-id indexed localised
> table
> > Compatibility with technologies already using 32 or 128 bit identifiers
> for
> > paths and sessions
> > Easy for flow spec to signal as it introduces no need to signal labels
> etc=E2=80=A6
> > no conflicts with existing label exchange technologies
> >
> > Feedback welcome.
> >
> > G/
> >
> > _______________________________________________
> > Idr mailing list
> > Idr@ietf.org
> > https://www.ietf.org/mailman/listinfo/idr
> >
>
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>
>

--089e013d14c284f6b7052312d411
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<p dir=3D"ltr">Gunter,</p>
<p dir=3D"ltr">No one in BGP land will question that decoupling and indirec=
tion is a good thing.</p>
<p dir=3D"ltr">But why do you need new PATH_ID rather then just using commu=
nity as a marker ? Be it regular, extended or wide ?</p>
<p dir=3D"ltr">Cheers,<br>
R.</p>
<div class=3D"gmail_quote">On Oct 27, 2015 10:01 AM, &quot;VAN DE VELDE, Gu=
nter (Gunter)&quot; &lt;<a href=3D"mailto:gunter.van_de_velde@alcatel-lucen=
t.com">gunter.van_de_velde@alcatel-lucent.com</a>&gt; wrote:<br type=3D"att=
ribution"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">



<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:Calibri,sans-serif">
<div>
<div>
<div>When configuring a PBR on a router using CLI you identify the =E2=80=
=98interesting=E2=80=99 traffic and the =E2=80=98actions=E2=80=99 =C2=A0upo=
n the interesting traffic.</div>
<div>
<div></div>
</div>
</div>
</div>
<div><br>
</div>
<div>PBR does not do anything for tunnel-setup or signaling=E2=80=A6 I do n=
ot think that Flowspec should be involved at all with set-up or=C2=A0</div>
<div>tunnel initiation as there are much better solutions to achieve that g=
oal in existence already. Flowspec can be used by a controller=C2=A0</div>
<div>to signal policies, and a next to traffic conditioning instructions a =
redirect policy seems as a reasonable fit.=C2=A0</div>
<div><br>
</div>
<div>Long story short: BGP Flowspec allows a controller to signal in a deco=
upled fashion both flow conditioning (already=C2=A0</div>
<div>exists) and flow steering (PATH_ID) meta-data. The receiving router co=
nsumes this meta-data and takes based upon that=C2=A0</div>
<div>meta-data localised decisions. Decoupling is a very powerful tool.</di=
v>
<div><br>
</div>
<div>G/</div>
<div><br>
</div>
<span>
<div style=3D"font-family:Calibri;font-size:12pt;text-align:left;color:blac=
k;BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOTTOM:0in;PADD=
ING-LEFT:0in;PADDING-RIGHT:0in;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:me=
dium none;PADDING-TOP:3pt">
<span style=3D"font-weight:bold">From: </span>Haoweiguo &lt;<a href=3D"mail=
to:haoweiguo@huawei.com" target=3D"_blank">haoweiguo@huawei.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Tuesday 27 October 2015 at 03=
:24<br>
<span style=3D"font-weight:bold">To: </span>Gunter Van de Velde &lt;<a href=
=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter=
.van_de_velde@alcatel-lucent.com</a>&gt;, Lizhenbin &lt;<a href=3D"mailto:l=
izhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;, Gunter=
 Van De Velde
 &lt;<a href=3D"mailto:guntervandeveldecc@icloud.com" target=3D"_blank">gun=
tervandeveldecc@icloud.com</a>&gt;, Robert Raszuk &lt;<a href=3D"mailto:rob=
ert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>&quot;<a href=3D"mailto:idr@iet=
f.org" target=3D"_blank">idr@ietf.org</a>&quot; &lt;<a href=3D"mailto:idr@i=
etf.org" target=3D"_blank">idr@ietf.org</a>&gt;, &quot;<a href=3D"mailto:sp=
ring@ietf.org" target=3D"_blank">spring@ietf.org</a>&quot; &lt;<a href=3D"m=
ailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;, &quot;<a =
href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&quot;
 &lt;<a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>=
&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>RE: [Idr] Regarding &quot;=
Semantics Independent&quot; Flowspec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=
=8D: New draft - Flowspec Path Redirect<br>
</div>
<div><br>
</div>
<div dir=3D"ltr">
<div style=3D"FONT-FAMILY:Calibri,sans-serif;WORD-WRAP:break-word;COLOR:rgb=
(0,0,0);FONT-SIZE:14px">
<div style=3D"direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt=
">
<p><font size=3D"3" face=3D"Times New Roman">Hi Gunter,</font></p>
<p><font size=3D"3" face=3D"Times New Roman">Understood your design method =
is to just specify PATH_ID in flowspec message, and let the routers do loca=
l recursive action to select a set of specific tunnel(s), the tunnel and PA=
TH_ID association should be configured
 beforehand at each router. The BGP flowspec initiator doesn&#39;t need to =
specify detail tunnel attributes, the flowspec message is tunnel semantic a=
gnostic. The router local decision is totally unrestrictive, the validation=
 and security seems to be hard to be
 controlled.</font></p>
<p><font size=3D"3" face=3D"Times New Roman">In traditional BGP flowspec de=
signing, BGP flowspec initiator specifies detail match fields and actions, =
the routers only enforce the actions without any flexibility for local deci=
sion. If using the traditional method,
 you worry about the complexity to specify detail tunnel attributes. </font=
></p>
<p><font size=3D"3" face=3D"Times New Roman">If the BGP flowspec initiator =
only cares about the redirect target IP address and tunnel type like NVO3, =
the tunnel attribute only need to include head-end information.
</font><font size=3D"3" face=3D"Times New Roman">The attribute can be descr=
ibed by <span style=3D"COLOR:rgb(31,73,125)">
draft-rosen-idr-tunnel-encaps-00, we only need to extend the draft usage fo=
r flowspec application.</span></font></p>
<p><font size=3D"3" face=3D"Times New Roman"><span style=3D"COLOR:rgb(31,73=
,125)"><font color=3D"#000000">If the BGP flowspec initiator cares about th=
e redirect target IP address and other QOS attributes such as BW, we can sp=
ecify the additional attribute using BGP
 to notify the router, then the router perform local tunnel selection per t=
he attribute.</font></span></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR:rgb(31,73,125)">In summary, i think the router local decision sho=
uld not be completely unrestrictive, the BGP flowspec initiator should spec=
ify some constraint tunnel attribute to
 restrict local tunnel selection. The most relaxing mode is to only specify=
 redirect target IP address. More strictly attribute specification will=C2=
=A0strengthen the constraint for each router&#39;s local tunnel selection. =
This method will faciliate the validation
 and security concern.</span></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR:rgb(31,73,125)"></span></font><font color=3D"#000000" size=3D"3" =
face=3D"Times New Roman"><span style=3D"COLOR:rgb(31,73,125)">Thanks,</span=
></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR:rgb(31,73,125)">weiguo</span></font></p>
<p></p>
<hr>
<p></p>
<div style=3D"FONT-FAMILY:Times New Roman;COLOR:#000000;FONT-SIZE:16px">
<div style=3D"DIRECTION:ltr"><font size=3D"2" face=3D"Tahoma"><b>From:</b> =
Idr [<a href=3D"mailto:idr-bounces@ietf.org" target=3D"_blank">idr-bounces@=
ietf.org</a>] on behalf of VAN DE VELDE, Gunter (Gunter) [<a href=3D"mailto=
:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter.van_de_ve=
lde@alcatel-lucent.com</a>]<br>
<b>Sent:</b> Tuesday, October 27, 2015 0:47<br>
<b>To:</b> Lizhenbin; Gunter Van De Velde; Robert Raszuk<br>
<b>Cc:</b> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf.org</=
a>; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; <a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rt=
gwg@ietf.org</a><br>
<b>Subject:</b> Re: [Idr] Regarding &quot;Semantics Independent&quot; Flows=
pec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: New draft - Flowspec Path Redi=
rect<br>
</font><br>
</div>
<div></div>
<div>
<div>
<div>
<div>
<div>
<div>Let me just copy the answer I sent to another email I just sent to IDR=
:</div>
<div><br>
</div>
<div>&lt;&gt;start snip&lt;&gt;</div>
<div>Hi Robin,</div>
<div><br>
</div>
<div>Thanks for your note.</div>
<div><br>
</div>
<div>A tunnel is not always going over shortest path. Some tunnels are TE t=
unnels and are deliberately not going over a shortest path. This is somethi=
ng that=C2=A0<span style=3D"COLOR:rgb(31,73,125)">draft-rosen-idr-tunnel-en=
caps-00=C2=A0</span>will not help to signal
 because the tunnel-encap attribute indicates tunnel parameters used by the=
 tail-end.</div>
<div><br>
</div>
<div>If a redirect tunnel represents a particular redirect/steering service=
 (better delay, less packet loss, non-SRLG, more BW, etc=E2=80=A6) then it =
does become rather complex for BGP as signalling technology because a tunne=
l relationship is a unique between &#39;a headend&#39;
 and =E2=80=98a tailed&#39; device. It seems better to leave tunnel-setup t=
o dedicated tunnel-setup mechanisms like PCEP, SR, etc=E2=80=A6.</div>
<div><br>
</div>
<div>The draft redirect-to-PATH_ID is providing the means to signal a flow-=
based redirect/steering service, and have each recipient router identify us=
ing local recursion for the PATH_IDs the corresponding tunnels/redirect-inf=
o. This allows for tunnel setup
 complexity to be taken away from BGP, while at the same time BGP is doing =
what it is very good at doing: &quot;It signals a policy=E2=80=9D in reliab=
le fashion.</div>
</div>
<div><br>
</div>
<div>Kind Regards,</div>
<div>G/</div>
</div>
<div>
<div></div>
</div>
</div>
</div>
<div><br>
</div>
<div>&lt;&gt;send snip&lt;&gt;</div>
<div><br>
</div>
<div>When looking at:=C2=A0<span style=3D"COLOR:rgb(31,73,125)">draft-litko=
wski-idr-flowspec-interfaceset t</span>hen find that this is a signalling m=
ethod to identify on which interfaces the rule needs to be activated upon. =
It is orthogonal from Redirect-to-path.</div>
<div><br>
</div>
<div>Segment Routing is a fine technology to built shortest Path and TE tun=
nels. Traffic steering is much more then redirecting to a Segment ID.=C2=A0=
</div>
<div><br>
</div>
<div>Looking at the above, I see little logic in your proposal Robin.</div>
<div><br>
</div>
<div>G/</div>
<div><br>
</div>
<span>
<div style=3D"BORDER-BOTTOM:medium none;TEXT-ALIGN:left;BORDER-LEFT:medium =
none;PADDING-BOTTOM:0in;PADDING-LEFT:0in;PADDING-RIGHT:0in;FONT-FAMILY:Cali=
bri;COLOR:black;FONT-SIZE:12pt;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:me=
dium none;PADDING-TOP:3pt">
<span style=3D"FONT-WEIGHT:bold">From: </span>Lizhenbin &lt;<a href=3D"mail=
to:lizhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;<br>
<span style=3D"FONT-WEIGHT:bold">Date: </span>Monday 26 October 2015 at 17:=
19<br>
<span style=3D"FONT-WEIGHT:bold">To: </span>Gunter Van de Velde &lt;<a href=
=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter=
.van_de_velde@alcatel-lucent.com</a>&gt;, Gunter Van De Velde &lt;<a href=
=3D"mailto:guntervandeveldecc@icloud.com" target=3D"_blank">guntervandeveld=
ecc@icloud.com</a>&gt;,
 Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">r=
obert@raszuk.net</a>&gt;<br>
<span style=3D"FONT-WEIGHT:bold">Cc: </span>&quot;<a href=3D"mailto:idr@iet=
f.org" target=3D"_blank">idr@ietf.org</a>&quot; &lt;<a href=3D"mailto:idr@i=
etf.org" target=3D"_blank">idr@ietf.org</a>&gt;, &quot;<a href=3D"mailto:rt=
gwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&quot; &lt;<a href=3D"mai=
lto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org=
</a>&quot; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@=
ietf.org</a>&gt;<br>
<span style=3D"FONT-WEIGHT:bold">Subject: </span>Regarding &quot;Semantics =
Independent&quot; Flowspec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: [Idr] N=
ew draft - Flowspec Path Redirect<br>
</div>
<div><br>
</div>
<div>
<div lang=3D"ZH-CN">
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Hi Folks,</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">I think now the drafts of B=
GP Flowspec for redirect to VRF/IP/Tunnel keeps the traditional way to =C2=
=A0extend BGP Flowspec to redirect to an
 entity with explicit meaning which has been defined clearly in the existin=
g work.
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Now draft-vandevelde-idr-fl=
owspec-path-redirect is to introduce the Path ID which can represent many f=
orwarding entities. draft-litkowski-idr-flowspec-interfaceset
 is also to introduce the new =E2=80=9Cgroup ID=E2=80=9D concepts. </span><=
/p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">There will be the problem h=
ow to define the path ID and group ID. In fact, my early comments proposed =
the suggestion that we can reuse
 some work of segment routing and generalize the concept of Segment, then i=
t </span>
</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">can provide a base for the =
abstracted view of different forwarding entities. In order to explain the u=
sage, I proposed the draft draft-li-spring-segment-path-programming
 to try to explain the idea clearly. Since now </span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">segment ID can be the indic=
ator of interface, node, tunnel, if we do not map segment ID to MPLS label =
or IPv6 address, it can be an identifier
 of all kinds of forwarding entities in the control plane which can be used=
 outside.
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Please refer to the Please =
refer to =E2=80=9C5.=C2=A0 Usecases of Segment Path Programming=E2=80=9D of=
 draft-li-spring-segment-path-programming:
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- 5.3.=C2=A0 Steering Traf=
fic without Mapping Segment to Label: This is the usecase to use segment ID=
 to implement =E2=80=9Credirect to IP/Link=E2=80=9D.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- 5.4.=C2=A0 Centralized M=
apping Service to Tunnels: This is the usecase to use segment ID to impleme=
nt =E2=80=9Credirect to tunnel=E2=80=9D.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">If BGP Flowspec can carry m=
ultiple segment IDs which represent different links of nodes, it can implem=
ent =E2=80=9Credirect to interface group=E2=80=9D.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">So I think if we can consol=
idate work of draft-vandevelde-idr-flowspec-path-redirect/ draft-litkowski-=
idr-flowspec-interfaceset/ draft-li-spring-segment-path-programming
 to propose the draft of BGP Flowspec =E2=80=9CRedirect to Segment ID=E2=80=
=9D </span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">to implement =E2=80=9CSeman=
tics Independent=E2=80=9D Flowspec. The existing SRGB info advertisement an=
d SID allocation mechanism can be easily reused and
 enhanced to provide the base instead of defining the new idea and implemen=
tation of
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Path ID/Group ID.</span></p=
>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Best Regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Zhenbin(Robin)</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<div>
<div style=3D"BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOT=
TOM:0cm;PADDING-LEFT:0cm;PADDING-RIGHT:0cm;BORDER-TOP:#b5c4df 1pt solid;BOR=
DER-RIGHT:medium none;PADDING-TOP:3pt">
<p class=3D"MsoNormal"><b><span style=3D"FONT-SIZE:10pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D"FONT-SIZE:1=
0pt" lang=3D"EN-US"> VAN DE VELDE, Gunter (Gunter) [<a href=3D"mailto:gunte=
r.van_de_velde@alcatel-lucent.com" target=3D"_blank">mailto:gunter.van_de_v=
elde@alcatel-lucent.com</a>]
<br>
</span><b><span style=3D"FONT-SIZE:10pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"FONT-SIZE:10pt" l=
ang=3D"EN-US"> 2015</span><span style=3D"FONT-SIZE:10pt">=E5=B9=B4<span lan=
g=3D"EN-US">9</span>=E6=9C=88<span lang=3D"EN-US">28</span>=E6=97=A5<span l=
ang=3D"EN-US"> 20:29<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Lizhenbin; Gunter Van De Velde; Robert Raszuk<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">
idr@ietf.org</a>; <a href=3D"mailto:pce@ietf.org" target=3D"_blank">pce@iet=
f.org</a><br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: </span>=E7=AD=94=E5=A4=8D<span lang=3D"EN-US">: [Idr] New draft=
 - Flowspec Path Redirect</span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">Dear Zhenbin,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">For (1.) I=E2=80=99ll compose some m=
ore text in a -01 version of the existing draft to document Flowspec PATH=
=E2=80=93ID. I assumed that it was clear with text
 already in the document, however, confusion seems to happen nevertheless.=
=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">For (2.) the indirection by abstract=
ion is the beauty of the idea and that is why its offering a more flexible =
solution then other idea&#39;s around
 the topic out there. Its an abstract forwarding indirection ID provided by=
 BGP flow spec. Existing technology (PCE, SR, RSVP, manual-config, orchestr=
ation, etc=E2=80=A6) can be used to create/signal/maintain/etc the tunnel/L=
SP/redirect-next-hop per application/service.=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">The proposal=C2=A0<a href=3D"https:/=
/tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-00" target=
=3D"_blank"><span style=3D"FONT-FAMILY:=E5=AE=8B=E4=BD=93;FONT-SIZE:12pt">d=
raft-vandevelde-idr-flowspec-path-redirect-00</span></a>=C2=A0does
 not provide a label or encap information but recipient uses localised redi=
rect information from existing and fine working technologies.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">Btw, your statement below that only =
one Path-ID can be signalled is wrong and is to some degree documented in t=
he existing draft.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">G/</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div style=3D"BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOT=
TOM:0cm;PADDING-LEFT:0cm;PADDING-RIGHT:0cm;BORDER-TOP:#b5c4df 1pt solid;BOR=
DER-RIGHT:medium none;PADDING-TOP:3pt">
<p class=3D"MsoNormal"><b><span style=3D"FONT-FAMILY:Calibri,sans-serif;COL=
OR:black" lang=3D"EN-US">From:
</span></b><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:black" lang=
=3D"EN-US">Lizhenbin<br>
<b>Date: </b>Monday 28 September 2015 13:16<br>
<b>To: </b>Gunter Van De Velde, Robert Raszuk<br>
<b>Cc: </b>&quot;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf=
.org</a>&quot;, Gunter Van de Velde, &quot;<a href=3D"mailto:pce@ietf.org" =
target=3D"_blank">pce@ietf.org</a>&quot;<br>
<b>Subject: </b></span><span style=3D"COLOR:black">=E7=AD=94=E5=A4=8D</span=
><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:black" lang=3D"EN-US">=
: [Idr] New draft - Flowspec Path Redirect</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Hi Gunter and Robert,</span=
><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">We are also doing similar w=
ork. Regarding the draft, the major concern is as follows:</span><span styl=
e=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">1. What does the PATH_ID re=
present? Does it mean only tunnel/LSP or all possible forwarding path inclu=
ding tunnel/LSP, interface, VRF,
 nexthop, etc?</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">2. How to allocate the PATH=
_ID for the forwarding path?</span><span style=3D"COLOR:black" lang=3D"EN-U=
S"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">We think the forwarding beh=
avior for Flowspec is always actual forwarding concepts including VRF, next=
hop, etc. So we proposed =E2=80=98redirect
 to tunnel=E2=80=99 in similar way. But for PATH_ID you proposed is another=
 way to generalize all possible forwarding path. It may be a new way to def=
ine forwarding behavior for BGP Flowspec.</span><span style=3D"COLOR:black"=
 lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Regarding redirecting tunne=
l, we proposed several drafts for your reference:</span><span style=3D"COLO=
R:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-hao-idr-flowspec-n=
vo3-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-li-idr-mpls-path-p=
rogramming-01</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-li-spring-tunnel-s=
egment-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-chen-pce-pce-initi=
ated-ip-tunnel-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-li-pce-tunnel-segm=
ent-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">As Weiguo mentioned, the &q=
uot;redirect to Tunnel&quot; for BGP Flowspec has been described briefly in=
 draft-hao-idr-flowspec-nvo3-00. We will split
 it into two drafts: 1. draft-hao-idr-flowspec-nvo3-01; 2. one independent =
draft to define the &quot;redirect to tunnel&quot; for BGP Flowspec.</span>=
<span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For &quot;redirect to tunne=
l&quot; for BGP flowspec, in fact there can be two types of such behaviors:=
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">1. Specify the tunnel type:=
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For this behavior, we will =
reuse the IP tunnel types defined in [draft-rosen-idr-tunnel-encaps-00] and=
 the MPLS tunnel types defined in
 [draft-li-idr-mpls-path-programming-01].</span><span style=3D"COLOR:black"=
 lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">2. Specify the specific tun=
nel:</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For MPLS TE tunnel, there c=
an be multiple MPLS TE tunnels for a specific destination. The tunnel type =
may be not enough. Then it is necessary
 to specify the specific MPLS TE tunnel through Tunnel Identifier. [RFC3209=
] defined the Tunnel Identifier for MPLS TE tunnel. PCE-initiated LSP adopt=
ed the Tunnel Identifier for which tunnel ID can be allocated by PCE. [draf=
t-li-idr-mpls-path-programming-01]
 will try to reuse the tunnel identifier and define it in the tunnel attrib=
ute which can be used for &quot;redirect to tunnel&quot; in [draft-hao-idr-=
flowspec-nvo3-00].
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For IP tunnel, there is alw=
ays only one IP forwarding path for a specific destination. So When define =
&quot;redirect to specific IP tunnel&quot;
 the nexthop plus the tunnel type may be enough in the existing deployment.=
 As the development of IP tunnels, it may be popular to configure multiple =
IP tunnels for the specific destination. For examples we can define multipl=
e MPLS-in-UDP tunnels for which
 the destination is same and the port number can be different for the purpo=
se of ECMP. In order to cope with such development, [draft-chen-pce-pce-ini=
tiated-ip-tunnel-00] is proposed to introduce the tunnel identifier for IP =
tunnels for which tunnel ID can
 also be allocated by PCE as the MPLS TE tunnel. It may be also reused in t=
he tunnel attributes for the &quot;redirect to tunnel&quot;.</span><span st=
yle=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">We think if it is only to t=
hink about &quot;redirect to tunnel&quot; for the BGP Flowspec there has al=
ready been much existing work and it is better
 to reuse them. </span><span style=3D"COLOR:black" lang=3D"EN-US"></span></=
p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">In fact the existing work t=
o specify a specific tunnel the tunnel identifier is a combination with the=
 ingress address/egress address and
 tunnel ID. But for the draft draft-vandevelde-idr-flowspec-path-redirect-0=
0, PATH_ID can be only one value to represent one tunnel. Recently we propo=
sed the drafts draft-li-spring-tunnel-segment-00/ draft-li-pce-tunnel-segme=
nt-00 in which the segment ID/label
 can be allocated for a tunnel. This is also to use one value to represent =
a tunnel. Now Segment Routing has defined many types segments which can map=
 to different forwarding path such as interface, node, tunnel, etc. From my=
 point of view, the work to define
 Segment-ID/Label and PATH-ID for the forwarding path can be consolidated a=
nd incorporated in the SRPING work. If we hope to define the generalized co=
ncept, maybe we can define =E2=80=9CRedirect to Segment=E2=80=9D for the BG=
P Flowspec. In [draft-li-idr-mpls-path-programming-01],
 we define the label combination attributes to map the service to the MPLS =
forwarding path. Maybe it can be enhanced to SID stack attribute to map to =
general forwarding path which can be used for multiple BGP address family i=
ncluding BGP Flowspec.</span><span style=3D"COLOR:black" lang=3D"EN-US"></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">This is about our thinking =
on the &quot;redirect to tunnel/path&quot; work. Hope to get your opinion o=
n it.
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Best Regards,</span><span s=
tyle=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Zhenbin(Robin)</span><span =
style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<div style=3D"BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOT=
TOM:0cm;PADDING-LEFT:0cm;PADDING-RIGHT:0cm;BORDER-TOP:#b5c4df 1pt solid;BOR=
DER-RIGHT:medium none;PADDING-TOP:3pt">
<p class=3D"MsoNormal"><b><span style=3D"COLOR:black;FONT-SIZE:10pt">=E5=8F=
=91=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D=
"COLOR:black;FONT-SIZE:10pt" lang=3D"EN-US"> Idr [<a href=3D"mailto:idr-bou=
nces@ietf.org" target=3D"_blank">mailto:idr-bounces@ietf.org</a>]
</span><b><span style=3D"COLOR:black;FONT-SIZE:10pt">=E4=BB=A3=E8=A1=A8 </s=
pan></b><span style=3D"COLOR:black;FONT-SIZE:10pt" lang=3D"EN-US">Gunter Va=
n De Velde<br>
</span><b><span style=3D"COLOR:black;FONT-SIZE:10pt">=E5=8F=91=E9=80=81=E6=
=97=B6=E9=97=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"COLOR=
:black;FONT-SIZE:10pt" lang=3D"EN-US"> 2015</span><span style=3D"COLOR:blac=
k;FONT-SIZE:10pt">=E5=B9=B4<span lang=3D"EN-US">9</span>=E6=9C=88<span lang=
=3D"EN-US">23</span>=E6=97=A5<span lang=3D"EN-US">
 20:44<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Robert Raszuk<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">
idr@ietf.org</a>; VAN DE VELDE, Gunter (Gunter)<br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: [Idr] New draft - Flowspec Path Redirect</span></span><span sty=
le=3D"COLOR:black" lang=3D"EN-US"></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"COLOR:black" lang=3D"EN-US"></span>=
=C2=A0</p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">Interresting question... I se=
e few options to address this. (And fwiw, i left this currently intentional=
ly out the text to see if some ideas pop-up to confirm or deny the ideas th=
e authors had on this topic)</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">The one which currently to me=
 resonates most is to treat the path-id similar as a traditional bgp next-h=
op address... Meaning, that if the receiving router does&#39;t have a &quot=
;valid&quot; entry in the locallised path-id table
 it treats flowspec rule as withdraw.</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">Decision on what is considere=
d &quot;valid&quot; is at first glance a local router decision.</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">If you have another proposal =
i would be happy to learn and see if it resonates.</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">Ciao,<br>
G/</span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"COLOR:black" lang=3D"EN-US"><br>
<br>
Sent using <a href=3D"https://cloudmagic.com/k/d/mailapp?ct=3Dpa&amp;cv=3D7=
.3.5&amp;pv=3D5.1.1&amp;source=3Demail_footer_2" target=3D"_blank">
CloudMagic Email</a> </span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"COLOR:#787878" lang=3D"EN-US">On Wed,=
 Sep 23, 2015 at 10:56 AM, Robert Raszuk &lt;<a href=3D"mailto:robert@raszu=
k.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:</span><span style=
=3D"COLOR:black" lang=3D"EN-US"></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"COLOR:black" lang=3D"EN-US"></span>=
=C2=A0</p>
<div>
<blockquote style=3D"MARGIN-TOP:5pt;MARGIN-BOTTOM:5pt">
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">He=
y Gunter,</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">Le=
t me ask you a question (which in fact also applies to redirect to<br>
next hop draft).</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">Wh=
at is the expected system action when the redirect path is down<br>
(assuming you have tools to detect it) or next hop you are redirecting<br>
it to is unreachable ?</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">I =
read your draft but other then definition of the encoding I was not<br>
able to find answers for this.</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">Th=
e original RFC5575 recommended redirect to local VRF which is just<br>
as loopback normally up and within that VRF your orchestration can<br>
redirect to next hop or path with whatever encapsulation you like.</span></=
p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">He=
re you (and redirect to next hop folks) are making a shortcut<br>
however in both works I have not seen a proper discussion nor<br>
definition of set of procedures which need to be executed upon your<br>
redirect entity failure.</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">I =
suggest both documents are updated with that before we proceed<br>
further with both proposals.</span></p>
<p style=3D"MARGIN-BOTTOM:12pt;BACKGROUND:white"><span style=3D"COLOR:black=
" lang=3D"EN-US">Cheers,<br>
R.<br>
<br>
<br>
<br>
<br>
</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">On=
 Wed, Sep 23, 2015 at 10:18 AM, VAN DE VELDE, Gunter (Gunter)<br>
&lt;<a href=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_bl=
ank">gunter.van_de_velde@alcatel-lucent.com</a>&gt; wrote:<br>
&gt; Hi Folks,<br>
&gt;<br>
&gt; We have created a new draft to allow the capability to have Flowspec s=
ignal<br>
&gt; a redirect to tunnel/LSP.<br>
&gt;<br>
&gt; <a href=3D"https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-p=
ath-redirect-00" target=3D"_blank">
https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-00<=
/a><br>
&gt;<br>
&gt; The base principle is to use the indirection capability of BGP for pat=
h<br>
&gt; redirection.<br>
&gt;<br>
&gt; This proposal defines a new flowspec community to signal a redirect<br=
>
&gt; </span><span style=3D"COLOR:black">=E2=80=98<span lang=3D"EN-US">path-=
id</span>=E2=80=99<span lang=3D"EN-US">. This path-id is is either a 128bit=
 or 32bit value<br>
&gt; Assumed is that recipient router supporting path-id redirect have a<br=
>
&gt; localised path-id indexed table containing LSP/tunnel encapsulation<br=
>
&gt; information.<br>
&gt; Existing technology can be used to construct/create this table (LDP, S=
R,<br>
&gt; RSVP, manual-config, etc</span>=E2=80=A6<span lang=3D"EN-US">) on a re=
cipient router. The LSP/tunnel encap table<br>
&gt; is indexed using 32 or 128 bit values.<br>
&gt;<br>
&gt; Flowspec path-id community is used to activate a redirect LSP/tunnel a=
nd<br>
&gt; provide by indirection the LSP/tunnel information for the flowspec<br>
&gt; identified traffic towards the LSP/tunnel.<br>
&gt;<br>
&gt; Benefits:<br>
&gt;<br>
&gt; no need for signalling labels or extra encap in BGP<br>
&gt; Each path-id indexed LSP/tunnel table is a localised construct<br>
&gt; existing technology is used to construct the path-id indexed localised=
 table<br>
&gt; Compatibility with technologies already using 32 or 128 bit identifier=
s for<br>
&gt; paths and sessions<br>
&gt; Easy for flow spec to signal as it introduces no need to signal labels=
 etc</span>=E2=80=A6<span lang=3D"EN-US"><br>
&gt; no conflicts with existing label exchange technologies<br>
&gt;<br>
&gt; Feedback welcome.<br>
&gt;<br>
&gt; G/<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Idr mailing list<br>
&gt; <a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank=
">https://www.ietf.org/mailman/listinfo/idr</a><br>
&gt;</span></span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">__=
_____________________________________________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/idr</a></span></p>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
</span></div>
</div>
</div>
</div>
</div>
</span>
</div>

</blockquote></div>

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Subject: Re: [spring] =?utf-8?q?=5BIdr=5D_Regarding_=22Semantics_Independent?= =?utf-8?b?IiBGbG93c3BlYy8v562U5aSNOiDnrZTlpI06IE5ldyBkcmFmdCAtIEZsb3dz?= =?utf-8?q?pec_Path_Redirect?=
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My question was specifically why *new* one is needed to just work as a
marker ?

R.
On Oct 27, 2015 10:44 AM, "VAN DE VELDE, Gunter (Gunter)" <
gunter.van_de_velde@alcatel-lucent.com> wrote:

> It =E2=80=98is' a community=E2=80=A6 just one used to indicate a
> redirection/traffic-steering service=E2=80=A6
>
> G/
>
> From: <rraszuk@gmail.com> on behalf of Robert Raszuk <robert@raszuk.net>
> Date: Tuesday 27 October 2015 at 10:37
> To: Gunter Van de Velde <gunter.van_de_velde@alcatel-lucent.com>
> Cc: "rtgwg@ietf.org" <rtgwg@ietf.org>, "spring@ietf.org" <spring@ietf.org=
>,
> "idr@ietf.org" <idr@ietf.org>, Gunter Van De Velde <
> guntervandeveldecc@icloud.com>, Lizhenbin <lizhenbin@huawei.com>,
> Haoweiguo <haoweiguo@huawei.com>
> Subject: Re: [Idr] Regarding "Semantics Independent" Flowspec//=E7=AD=94=
=E5=A4=8D: =E7=AD=94=E5=A4=8D:
> New draft - Flowspec Path Redirect
>
> Gunter,
>
> No one in BGP land will question that decoupling and indirection is a goo=
d
> thing.
>
> But why do you need new PATH_ID rather then just using community as a
> marker ? Be it regular, extended or wide ?
>
> Cheers,
> R.
> On Oct 27, 2015 10:01 AM, "VAN DE VELDE, Gunter (Gunter)" <
> gunter.van_de_velde@alcatel-lucent.com> wrote:
>
>> When configuring a PBR on a router using CLI you identify the
>> =E2=80=98interesting=E2=80=99 traffic and the =E2=80=98actions=E2=80=99 =
 upon the interesting traffic.
>>
>> PBR does not do anything for tunnel-setup or signaling=E2=80=A6 I do not=
 think
>> that Flowspec should be involved at all with set-up or
>> tunnel initiation as there are much better solutions to achieve that goa=
l
>> in existence already. Flowspec can be used by a controller
>> to signal policies, and a next to traffic conditioning instructions a
>> redirect policy seems as a reasonable fit.
>>
>> Long story short: BGP Flowspec allows a controller to signal in a
>> decoupled fashion both flow conditioning (already
>> exists) and flow steering (PATH_ID) meta-data. The receiving router
>> consumes this meta-data and takes based upon that
>> meta-data localised decisions. Decoupling is a very powerful tool.
>>
>> G/
>>
>> From: Haoweiguo <haoweiguo@huawei.com>
>> Date: Tuesday 27 October 2015 at 03:24
>> To: Gunter Van de Velde <gunter.van_de_velde@alcatel-lucent.com>,
>> Lizhenbin <lizhenbin@huawei.com>, Gunter Van De Velde <
>> guntervandeveldecc@icloud.com>, Robert Raszuk <robert@raszuk.net>
>> Cc: "idr@ietf.org" <idr@ietf.org>, "spring@ietf.org" <spring@ietf.org>, =
"
>> rtgwg@ietf.org" <rtgwg@ietf.org>
>> Subject: RE: [Idr] Regarding "Semantics Independent" Flowspec//=E7=AD=94=
=E5=A4=8D: =E7=AD=94=E5=A4=8D:
>> New draft - Flowspec Path Redirect
>>
>> Hi Gunter,
>>
>> Understood your design method is to just specify PATH_ID in flowspec
>> message, and let the routers do local recursive action to select a set o=
f
>> specific tunnel(s), the tunnel and PATH_ID association should be configu=
red
>> beforehand at each router. The BGP flowspec initiator doesn't need to
>> specify detail tunnel attributes, the flowspec message is tunnel semanti=
c
>> agnostic. The router local decision is totally unrestrictive, the
>> validation and security seems to be hard to be controlled.
>>
>> In traditional BGP flowspec designing, BGP flowspec initiator specifies
>> detail match fields and actions, the routers only enforce the actions
>> without any flexibility for local decision. If using the traditional
>> method, you worry about the complexity to specify detail tunnel attribut=
es.
>>
>> If the BGP flowspec initiator only cares about the redirect target IP
>> address and tunnel type like NVO3, the tunnel attribute only need to
>> include head-end information. The attribute can be described by draft-ro=
sen-idr-tunnel-encaps-00,
>> we only need to extend the draft usage for flowspec application.
>>
>> If the BGP flowspec initiator cares about the redirect target IP address
>> and other QOS attributes such as BW, we can specify the additional
>> attribute using BGP to notify the router, then the router perform local
>> tunnel selection per the attribute.
>>
>> In summary, i think the router local decision should not be completely
>> unrestrictive, the BGP flowspec initiator should specify some constraint
>> tunnel attribute to restrict local tunnel selection. The most relaxing m=
ode
>> is to only specify redirect target IP address. More strictly attribute
>> specification will strengthen the constraint for each router's local tun=
nel
>> selection. This method will faciliate the validation and security concer=
n.
>>
>> Thanks,
>>
>> weiguo
>>
>> ------------------------------
>>
>> *From:* Idr [idr-bounces@ietf.org] on behalf of VAN DE VELDE, Gunter
>> (Gunter) [gunter.van_de_velde@alcatel-lucent.com]
>> *Sent:* Tuesday, October 27, 2015 0:47
>> *To:* Lizhenbin; Gunter Van De Velde; Robert Raszuk
>> *Cc:* idr@ietf.org; spring@ietf.org; rtgwg@ietf.org
>> *Subject:* Re: [Idr] Regarding "Semantics Independent" Flowspec//=E7=AD=
=94=E5=A4=8D: =E7=AD=94=E5=A4=8D:
>> New draft - Flowspec Path Redirect
>>
>> Let me just copy the answer I sent to another email I just sent to IDR:
>>
>> <>start snip<>
>> Hi Robin,
>>
>> Thanks for your note.
>>
>> A tunnel is not always going over shortest path. Some tunnels are TE
>> tunnels and are deliberately not going over a shortest path. This is
>> something that draft-rosen-idr-tunnel-encaps-00 will not help to signal
>> because the tunnel-encap attribute indicates tunnel parameters used by t=
he
>> tail-end.
>>
>> If a redirect tunnel represents a particular redirect/steering service
>> (better delay, less packet loss, non-SRLG, more BW, etc=E2=80=A6) then i=
t does
>> become rather complex for BGP as signalling technology because a tunnel
>> relationship is a unique between 'a headend' and =E2=80=98a tailed' devi=
ce. It
>> seems better to leave tunnel-setup to dedicated tunnel-setup mechanisms
>> like PCEP, SR, etc=E2=80=A6.
>>
>> The draft redirect-to-PATH_ID is providing the means to signal a
>> flow-based redirect/steering service, and have each recipient router
>> identify using local recursion for the PATH_IDs the corresponding
>> tunnels/redirect-info. This allows for tunnel setup complexity to be tak=
en
>> away from BGP, while at the same time BGP is doing what it is very good =
at
>> doing: "It signals a policy=E2=80=9D in reliable fashion.
>>
>> Kind Regards,
>> G/
>>
>> <>send snip<>
>>
>> When looking at: draft-litkowski-idr-flowspec-interfaceset then find
>> that this is a signalling method to identify on which interfaces the rul=
e
>> needs to be activated upon. It is orthogonal from Redirect-to-path.
>>
>> Segment Routing is a fine technology to built shortest Path and TE
>> tunnels. Traffic steering is much more then redirecting to a Segment ID.
>>
>> Looking at the above, I see little logic in your proposal Robin.
>>
>> G/
>>
>> From: Lizhenbin <lizhenbin@huawei.com>
>> Date: Monday 26 October 2015 at 17:19
>> To: Gunter Van de Velde <gunter.van_de_velde@alcatel-lucent.com>, Gunter
>> Van De Velde <guntervandeveldecc@icloud.com>, Robert Raszuk <
>> robert@raszuk.net>
>> Cc: "idr@ietf.org" <idr@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "
>> spring@ietf.org" <spring@ietf.org>
>> Subject: Regarding "Semantics Independent" Flowspec//=E7=AD=94=E5=A4=8D:=
 =E7=AD=94=E5=A4=8D: [Idr] New
>> draft - Flowspec Path Redirect
>>
>> Hi Folks,
>>
>> I think now the drafts of BGP Flowspec for redirect to VRF/IP/Tunnel
>> keeps the traditional way to  extend BGP Flowspec to redirect to an enti=
ty
>> with explicit meaning which has been defined clearly in the existing wor=
k.
>>
>> Now draft-vandevelde-idr-flowspec-path-redirect is to introduce the Path
>> ID which can represent many forwarding entities.
>> draft-litkowski-idr-flowspec-interfaceset is also to introduce the new
>> =E2=80=9Cgroup ID=E2=80=9D concepts.
>>
>> There will be the problem how to define the path ID and group ID. In
>> fact, my early comments proposed the suggestion that we can reuse some w=
ork
>> of segment routing and generalize the concept of Segment, then it
>>
>> can provide a base for the abstracted view of different forwarding
>> entities. In order to explain the usage, I proposed the draft
>> draft-li-spring-segment-path-programming to try to explain the idea
>> clearly. Since now
>>
>> segment ID can be the indicator of interface, node, tunnel, if we do not
>> map segment ID to MPLS label or IPv6 address, it can be an identifier of
>> all kinds of forwarding entities in the control plane which can be used
>> outside.
>>
>> Please refer to the Please refer to =E2=80=9C5.  Usecases of Segment Pat=
h
>> Programming=E2=80=9D of draft-li-spring-segment-path-programming:
>>
>> -- 5.3.  Steering Traffic without Mapping Segment to Label: This is the
>> usecase to use segment ID to implement =E2=80=9Credirect to IP/Link=E2=
=80=9D.
>>
>> -- 5.4.  Centralized Mapping Service to Tunnels: This is the usecase to
>> use segment ID to implement =E2=80=9Credirect to tunnel=E2=80=9D.
>>
>> If BGP Flowspec can carry multiple segment IDs which represent different
>> links of nodes, it can implement =E2=80=9Credirect to interface group=E2=
=80=9D.
>>
>> So I think if we can consolidate work of
>> draft-vandevelde-idr-flowspec-path-redirect/
>> draft-litkowski-idr-flowspec-interfaceset/
>> draft-li-spring-segment-path-programming to propose the draft of BGP
>> Flowspec =E2=80=9CRedirect to Segment ID=E2=80=9D
>>
>> to implement =E2=80=9CSemantics Independent=E2=80=9D Flowspec. The exist=
ing SRGB info
>> advertisement and SID allocation mechanism can be easily reused and
>> enhanced to provide the base instead of defining the new idea and
>> implementation of
>>
>> Path ID/Group ID.
>>
>>
>>
>>
>>
>>
>>
>> Best Regards,
>>
>> Zhenbin(Robin)
>>
>>
>>
>>
>>
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* VAN DE VELDE, Gunter (Gunter) [
>> mailto:gunter.van_de_velde@alcatel-lucent.com
>> <gunter.van_de_velde@alcatel-lucent.com>]
>> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2015=E5=B9=B49=E6=9C=8828=E6=97=
=A5 20:29
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Lizhenbin; Gunter Van De Velde; Robert Ra=
szuk
>> *=E6=8A=84=E9=80=81:* idr@ietf.org; pce@ietf.org
>> *=E4=B8=BB=E9=A2=98:* Re: =E7=AD=94=E5=A4=8D: [Idr] New draft - Flowspec=
 Path Redirect
>>
>>
>>
>> Dear Zhenbin,
>>
>>
>>
>> For (1.) I=E2=80=99ll compose some more text in a -01 version of the exi=
sting
>> draft to document Flowspec PATH=E2=80=93ID. I assumed that it was clear =
with text
>> already in the document, however, confusion seems to happen nevertheless=
.
>>
>>
>>
>> For (2.) the indirection by abstraction is the beauty of the idea and
>> that is why its offering a more flexible solution then other idea's arou=
nd
>> the topic out there. Its an abstract forwarding indirection ID provided =
by
>> BGP flow spec. Existing technology (PCE, SR, RSVP, manual-config,
>> orchestration, etc=E2=80=A6) can be used to create/signal/maintain/etc t=
he
>> tunnel/LSP/redirect-next-hop per application/service.
>>
>>
>>
>> The proposal draft-vandevelde-idr-flowspec-path-redirect-00
>> <https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect=
-00> does
>> not provide a label or encap information but recipient uses localised
>> redirect information from existing and fine working technologies.
>>
>>
>>
>> Btw, your statement below that only one Path-ID can be signalled is wron=
g
>> and is to some degree documented in the existing draft.
>>
>>
>>
>> G/
>>
>>
>>
>>
>>
>>
>>
>> *From: *Lizhenbin
>> *Date: *Monday 28 September 2015 13:16
>> *To: *Gunter Van De Velde, Robert Raszuk
>> *Cc: *"idr@ietf.org", Gunter Van de Velde, "pce@ietf.org"
>> *Subject: *=E7=AD=94=E5=A4=8D: [Idr] New draft - Flowspec Path Redirect
>>
>>
>>
>> Hi Gunter and Robert,
>>
>> We are also doing similar work. Regarding the draft, the major concern i=
s
>> as follows:
>>
>> 1. What does the PATH_ID represent? Does it mean only tunnel/LSP or all
>> possible forwarding path including tunnel/LSP, interface, VRF, nexthop, =
etc?
>>
>> 2. How to allocate the PATH_ID for the forwarding path?
>>
>> We think the forwarding behavior for Flowspec is always actual forwardin=
g
>> concepts including VRF, nexthop, etc. So we proposed =E2=80=98redirect t=
o tunnel=E2=80=99
>> in similar way. But for PATH_ID you proposed is another way to generaliz=
e
>> all possible forwarding path. It may be a new way to define forwarding
>> behavior for BGP Flowspec.
>>
>>
>>
>> Regarding redirecting tunnel, we proposed several drafts for your
>> reference:
>>
>> -- draft-hao-idr-flowspec-nvo3-00
>>
>> -- draft-li-idr-mpls-path-programming-01
>>
>> -- draft-li-spring-tunnel-segment-00
>>
>> -- draft-chen-pce-pce-initiated-ip-tunnel-00
>>
>> -- draft-li-pce-tunnel-segment-00
>>
>>
>>
>> As Weiguo mentioned, the "redirect to Tunnel" for BGP Flowspec has been
>> described briefly in draft-hao-idr-flowspec-nvo3-00. We will split it in=
to
>> two drafts: 1. draft-hao-idr-flowspec-nvo3-01; 2. one independent draft =
to
>> define the "redirect to tunnel" for BGP Flowspec.
>>
>>
>>
>> For "redirect to tunnel" for BGP flowspec, in fact there can be two type=
s
>> of such behaviors:
>>
>> 1. Specify the tunnel type:
>>
>> For this behavior, we will reuse the IP tunnel types defined in
>> [draft-rosen-idr-tunnel-encaps-00] and the MPLS tunnel types defined in
>> [draft-li-idr-mpls-path-programming-01].
>>
>> 2. Specify the specific tunnel:
>>
>> For MPLS TE tunnel, there can be multiple MPLS TE tunnels for a specific
>> destination. The tunnel type may be not enough. Then it is necessary to
>> specify the specific MPLS TE tunnel through Tunnel Identifier. [RFC3209]
>> defined the Tunnel Identifier for MPLS TE tunnel. PCE-initiated LSP adop=
ted
>> the Tunnel Identifier for which tunnel ID can be allocated by PCE.
>> [draft-li-idr-mpls-path-programming-01] will try to reuse the tunnel
>> identifier and define it in the tunnel attribute which can be used for
>> "redirect to tunnel" in [draft-hao-idr-flowspec-nvo3-00].
>>
>> For IP tunnel, there is always only one IP forwarding path for a specifi=
c
>> destination. So When define "redirect to specific IP tunnel" the nexthop
>> plus the tunnel type may be enough in the existing deployment. As the
>> development of IP tunnels, it may be popular to configure multiple IP
>> tunnels for the specific destination. For examples we can define multipl=
e
>> MPLS-in-UDP tunnels for which the destination is same and the port numbe=
r
>> can be different for the purpose of ECMP. In order to cope with such
>> development, [draft-chen-pce-pce-initiated-ip-tunnel-00] is proposed to
>> introduce the tunnel identifier for IP tunnels for which tunnel ID can a=
lso
>> be allocated by PCE as the MPLS TE tunnel. It may be also reused in the
>> tunnel attributes for the "redirect to tunnel".
>>
>>
>>
>> We think if it is only to think about "redirect to tunnel" for the BGP
>> Flowspec there has already been much existing work and it is better to
>> reuse them.
>>
>>
>>
>> In fact the existing work to specify a specific tunnel the tunnel
>> identifier is a combination with the ingress address/egress address and
>> tunnel ID. But for the draft
>> draft-vandevelde-idr-flowspec-path-redirect-00, PATH_ID can be only one
>> value to represent one tunnel. Recently we proposed the drafts
>> draft-li-spring-tunnel-segment-00/ draft-li-pce-tunnel-segment-00 in whi=
ch
>> the segment ID/label can be allocated for a tunnel. This is also to use =
one
>> value to represent a tunnel. Now Segment Routing has defined many types
>> segments which can map to different forwarding path such as interface,
>> node, tunnel, etc. From my point of view, the work to define
>> Segment-ID/Label and PATH-ID for the forwarding path can be consolidated
>> and incorporated in the SRPING work. If we hope to define the generalize=
d
>> concept, maybe we can define =E2=80=9CRedirect to Segment=E2=80=9D for t=
he BGP Flowspec. In
>> [draft-li-idr-mpls-path-programming-01], we define the label combination
>> attributes to map the service to the MPLS forwarding path. Maybe it can =
be
>> enhanced to SID stack attribute to map to general forwarding path which =
can
>> be used for multiple BGP address family including BGP Flowspec.
>>
>>
>>
>> This is about our thinking on the "redirect to tunnel/path" work. Hope t=
o
>> get your opinion on it.
>>
>>
>>
>>
>>
>> Best Regards,
>>
>> Zhenbin(Robin)
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* Idr [mailto:idr-bounces@ietf.org <idr-bou=
nces@ietf.org>] *=E4=BB=A3=E8=A1=A8 *Gunter
>> Van De Velde
>> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2015=E5=B9=B49=E6=9C=8823=E6=97=
=A5 20:44
>> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Robert Raszuk
>> *=E6=8A=84=E9=80=81:* idr@ietf.org; VAN DE VELDE, Gunter (Gunter)
>> *=E4=B8=BB=E9=A2=98:* Re: [Idr] New draft - Flowspec Path Redirect
>>
>>
>>
>> Interresting question... I see few options to address this. (And fwiw, i
>> left this currently intentionally out the text to see if some ideas pop-=
up
>> to confirm or deny the ideas the authors had on this topic)
>>
>> The one which currently to me resonates most is to treat the path-id
>> similar as a traditional bgp next-hop address... Meaning, that if the
>> receiving router does't have a "valid" entry in the locallised path-id
>> table it treats flowspec rule as withdraw.
>>
>> Decision on what is considered "valid" is at first glance a local router
>> decision.
>>
>> If you have another proposal i would be happy to learn and see if it
>> resonates.
>>
>> Ciao,
>> G/
>>
>>
>>
>> Sent using CloudMagic Email
>> <https://cloudmagic.com/k/d/mailapp?ct=3Dpa&cv=3D7.3.5&pv=3D5.1.1&source=
=3Demail_footer_2>
>>
>> On Wed, Sep 23, 2015 at 10:56 AM, Robert Raszuk <robert@raszuk.net>
>> wrote:
>>
>>
>>
>> Hey Gunter,
>>
>> Let me ask you a question (which in fact also applies to redirect to
>> next hop draft).
>>
>> What is the expected system action when the redirect path is down
>> (assuming you have tools to detect it) or next hop you are redirecting
>> it to is unreachable ?
>>
>> I read your draft but other then definition of the encoding I was not
>> able to find answers for this.
>>
>> The original RFC5575 recommended redirect to local VRF which is just
>> as loopback normally up and within that VRF your orchestration can
>> redirect to next hop or path with whatever encapsulation you like.
>>
>> Here you (and redirect to next hop folks) are making a shortcut
>> however in both works I have not seen a proper discussion nor
>> definition of set of procedures which need to be executed upon your
>> redirect entity failure.
>>
>> I suggest both documents are updated with that before we proceed
>> further with both proposals.
>>
>> Cheers,
>> R.
>>
>>
>>
>>
>> On Wed, Sep 23, 2015 at 10:18 AM, VAN DE VELDE, Gunter (Gunter)
>> <gunter.van_de_velde@alcatel-lucent.com> wrote:
>> > Hi Folks,
>> >
>> > We have created a new draft to allow the capability to have Flowspec
>> signal
>> > a redirect to tunnel/LSP.
>> >
>> >
>> https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-=
00
>> >
>> > The base principle is to use the indirection capability of BGP for pat=
h
>> > redirection.
>> >
>> > This proposal defines a new flowspec community to signal a redirect
>> > =E2=80=98path-id=E2=80=99. This path-id is is either a 128bit or 32bit=
 value
>> > Assumed is that recipient router supporting path-id redirect have a
>> > localised path-id indexed table containing LSP/tunnel encapsulation
>> > information.
>> > Existing technology can be used to construct/create this table (LDP, S=
R,
>> > RSVP, manual-config, etc=E2=80=A6) on a recipient router. The LSP/tunn=
el encap
>> table
>> > is indexed using 32 or 128 bit values.
>> >
>> > Flowspec path-id community is used to activate a redirect LSP/tunnel a=
nd
>> > provide by indirection the LSP/tunnel information for the flowspec
>> > identified traffic towards the LSP/tunnel.
>> >
>> > Benefits:
>> >
>> > no need for signalling labels or extra encap in BGP
>> > Each path-id indexed LSP/tunnel table is a localised construct
>> > existing technology is used to construct the path-id indexed localised
>> table
>> > Compatibility with technologies already using 32 or 128 bit identifier=
s
>> for
>> > paths and sessions
>> > Easy for flow spec to signal as it introduces no need to signal labels
>> etc=E2=80=A6
>> > no conflicts with existing label exchange technologies
>> >
>> > Feedback welcome.
>> >
>> > G/
>> >
>> > _______________________________________________
>> > Idr mailing list
>> > Idr@ietf.org
>> > https://www.ietf.org/mailman/listinfo/idr
>> >
>>
>> _______________________________________________
>> Idr mailing list
>> Idr@ietf.org
>> https://www.ietf.org/mailman/listinfo/idr
>>
>>

--f46d043c7d807a4f4e0523133718
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<p dir=3D"ltr">My question was specifically why *new* one is needed to just=
 work as a marker ?</p>
<p dir=3D"ltr">R.</p>
<div class=3D"gmail_quote">On Oct 27, 2015 10:44 AM, &quot;VAN DE VELDE, Gu=
nter (Gunter)&quot; &lt;<a href=3D"mailto:gunter.van_de_velde@alcatel-lucen=
t.com">gunter.van_de_velde@alcatel-lucent.com</a>&gt; wrote:<br type=3D"att=
ribution"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">



<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:Calibri,sans-serif">
<div>
<div>It =E2=80=98is&#39; a community=E2=80=A6 just one used to indicate a r=
edirection/traffic-steering service=E2=80=A6=C2=A0</div>
<div><br>
</div>
<div>
<div></div>
</div>
</div>
<div>G/</div>
<div><br>
</div>
<span>
<div style=3D"font-family:Calibri;font-size:12pt;text-align:left;color:blac=
k;BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOTTOM:0in;PADD=
ING-LEFT:0in;PADDING-RIGHT:0in;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:me=
dium none;PADDING-TOP:3pt">
<span style=3D"font-weight:bold">From: </span>&lt;<a href=3D"mailto:rraszuk=
@gmail.com" target=3D"_blank">rraszuk@gmail.com</a>&gt; on behalf of Robert=
 Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@r=
aszuk.net</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Tuesday 27 October 2015 at 10=
:37<br>
<span style=3D"font-weight:bold">To: </span>Gunter Van de Velde &lt;<a href=
=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter=
.van_de_velde@alcatel-lucent.com</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>&quot;<a href=3D"mailto:rtgwg@i=
etf.org" target=3D"_blank">rtgwg@ietf.org</a>&quot; &lt;<a href=3D"mailto:r=
tgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&gt;, &quot;<a href=3D"m=
ailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&quot; &lt;<a h=
ref=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf.org</a>&q=
uot; &lt;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf.org</a>=
&gt;, Gunter Van De Velde &lt;<a href=3D"mailto:guntervandeveldecc@icloud.c=
om" target=3D"_blank">guntervandeveldecc@icloud.com</a>&gt;, Lizhenbin &lt;=
<a href=3D"mailto:lizhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.=
com</a>&gt;,
 Haoweiguo &lt;<a href=3D"mailto:haoweiguo@huawei.com" target=3D"_blank">ha=
oweiguo@huawei.com</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: [Idr] Regarding &quot;=
Semantics Independent&quot; Flowspec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=
=8D: New draft - Flowspec Path Redirect<br>
</div>
<div><br>
</div>
<div>
<div>
<p dir=3D"ltr">Gunter,</p>
<p dir=3D"ltr">No one in BGP land will question that decoupling and indirec=
tion is a good thing.</p>
<p dir=3D"ltr">But why do you need new PATH_ID rather then just using commu=
nity as a marker ? Be it regular, extended or wide ?</p>
<p dir=3D"ltr">Cheers,<br>
R.</p>
<div class=3D"gmail_quote">On Oct 27, 2015 10:01 AM, &quot;VAN DE VELDE, Gu=
nter (Gunter)&quot; &lt;<a href=3D"mailto:gunter.van_de_velde@alcatel-lucen=
t.com" target=3D"_blank">gunter.van_de_velde@alcatel-lucent.com</a>&gt; wro=
te:<br type=3D"attribution">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:Calibri,sans-serif">
<div>
<div>
<div>When configuring a PBR on a router using CLI you identify the =E2=80=
=98interesting=E2=80=99 traffic and the =E2=80=98actions=E2=80=99 =C2=A0upo=
n the interesting traffic.</div>
<div>
<div></div>
</div>
</div>
</div>
<div><br>
</div>
<div>PBR does not do anything for tunnel-setup or signaling=E2=80=A6 I do n=
ot think that Flowspec should be involved at all with set-up or=C2=A0</div>
<div>tunnel initiation as there are much better solutions to achieve that g=
oal in existence already. Flowspec can be used by a controller=C2=A0</div>
<div>to signal policies, and a next to traffic conditioning instructions a =
redirect policy seems as a reasonable fit.=C2=A0</div>
<div><br>
</div>
<div>Long story short: BGP Flowspec allows a controller to signal in a deco=
upled fashion both flow conditioning (already=C2=A0</div>
<div>exists) and flow steering (PATH_ID) meta-data. The receiving router co=
nsumes this meta-data and takes based upon that=C2=A0</div>
<div>meta-data localised decisions. Decoupling is a very powerful tool.</di=
v>
<div><br>
</div>
<div>G/</div>
<div><br>
</div>
<span>
<div style=3D"font-family:Calibri;font-size:12pt;text-align:left;color:blac=
k;BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOTTOM:0in;PADD=
ING-LEFT:0in;PADDING-RIGHT:0in;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:me=
dium none;PADDING-TOP:3pt">
<span style=3D"font-weight:bold">From: </span>Haoweiguo &lt;<a href=3D"mail=
to:haoweiguo@huawei.com" target=3D"_blank">haoweiguo@huawei.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Tuesday 27 October 2015 at 03=
:24<br>
<span style=3D"font-weight:bold">To: </span>Gunter Van de Velde &lt;<a href=
=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter=
.van_de_velde@alcatel-lucent.com</a>&gt;, Lizhenbin &lt;<a href=3D"mailto:l=
izhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;,
 Gunter Van De Velde &lt;<a href=3D"mailto:guntervandeveldecc@icloud.com" t=
arget=3D"_blank">guntervandeveldecc@icloud.com</a>&gt;, Robert Raszuk &lt;<=
a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>=
&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>&quot;<a href=3D"mailto:idr@iet=
f.org" target=3D"_blank">idr@ietf.org</a>&quot; &lt;<a href=3D"mailto:idr@i=
etf.org" target=3D"_blank">idr@ietf.org</a>&gt;, &quot;<a href=3D"mailto:sp=
ring@ietf.org" target=3D"_blank">spring@ietf.org</a>&quot; &lt;<a href=3D"m=
ailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</=
a>&quot; &lt;<a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf=
.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>RE: [Idr] Regarding &quot;=
Semantics Independent&quot; Flowspec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=
=8D: New draft - Flowspec Path Redirect<br>
</div>
<div><br>
</div>
<div dir=3D"ltr">
<div style=3D"FONT-FAMILY:Calibri,sans-serif;WORD-WRAP:break-word;COLOR:rgb=
(0,0,0);FONT-SIZE:14px">
<div style=3D"direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt=
">
<p><font size=3D"3" face=3D"Times New Roman">Hi Gunter,</font></p>
<p><font size=3D"3" face=3D"Times New Roman">Understood your design method =
is to just specify PATH_ID in flowspec message, and let the routers do loca=
l recursive action to select a set of specific tunnel(s), the tunnel and PA=
TH_ID association should be configured
 beforehand at each router. The BGP flowspec initiator doesn&#39;t need to =
specify detail tunnel attributes, the flowspec message is tunnel semantic a=
gnostic. The router local decision is totally unrestrictive, the validation=
 and security seems to be hard to be
 controlled.</font></p>
<p><font size=3D"3" face=3D"Times New Roman">In traditional BGP flowspec de=
signing, BGP flowspec initiator specifies detail match fields and actions, =
the routers only enforce the actions without any flexibility for local deci=
sion. If using the traditional method,
 you worry about the complexity to specify detail tunnel attributes. </font=
></p>
<p><font size=3D"3" face=3D"Times New Roman">If the BGP flowspec initiator =
only cares about the redirect target IP address and tunnel type like NVO3, =
the tunnel attribute only need to include head-end information.
</font><font size=3D"3" face=3D"Times New Roman">The attribute can be descr=
ibed by <span style=3D"COLOR:rgb(31,73,125)">
draft-rosen-idr-tunnel-encaps-00, we only need to extend the draft usage fo=
r flowspec application.</span></font></p>
<p><font size=3D"3" face=3D"Times New Roman"><span style=3D"COLOR:rgb(31,73=
,125)"><font color=3D"#000000">If the BGP flowspec initiator cares about th=
e redirect target IP address and other QOS attributes such as BW, we can sp=
ecify the additional attribute using BGP
 to notify the router, then the router perform local tunnel selection per t=
he attribute.</font></span></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR:rgb(31,73,125)">In summary, i think the router local decision sho=
uld not be completely unrestrictive, the BGP flowspec initiator should spec=
ify some constraint tunnel attribute to restrict
 local tunnel selection. The most relaxing mode is to only specify redirect=
 target IP address. More strictly attribute specification will=C2=A0strengt=
hen the constraint for each router&#39;s local tunnel selection. This metho=
d will faciliate the validation and security
 concern.</span></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR:rgb(31,73,125)"></span></font><font color=3D"#000000" size=3D"3" =
face=3D"Times New Roman"><span style=3D"COLOR:rgb(31,73,125)">Thanks,</span=
></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR:rgb(31,73,125)">weiguo</span></font></p>
<p></p>
<hr>
<p></p>
<div style=3D"FONT-FAMILY:Times New Roman;COLOR:#000000;FONT-SIZE:16px">
<div style=3D"DIRECTION:ltr"><font size=3D"2" face=3D"Tahoma"><b>From:</b> =
Idr [<a href=3D"mailto:idr-bounces@ietf.org" target=3D"_blank">idr-bounces@=
ietf.org</a>] on behalf of VAN DE VELDE, Gunter (Gunter) [<a href=3D"mailto=
:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter.van_de_ve=
lde@alcatel-lucent.com</a>]<br>
<b>Sent:</b> Tuesday, October 27, 2015 0:47<br>
<b>To:</b> Lizhenbin; Gunter Van De Velde; Robert Raszuk<br>
<b>Cc:</b> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf.org</=
a>; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">
spring@ietf.org</a>; <a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rt=
gwg@ietf.org</a><br>
<b>Subject:</b> Re: [Idr] Regarding &quot;Semantics Independent&quot; Flows=
pec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: New draft - Flowspec Path Redi=
rect<br>
</font><br>
</div>
<div></div>
<div>
<div>
<div>
<div>
<div>
<div>Let me just copy the answer I sent to another email I just sent to IDR=
:</div>
<div><br>
</div>
<div>&lt;&gt;start snip&lt;&gt;</div>
<div>Hi Robin,</div>
<div><br>
</div>
<div>Thanks for your note.</div>
<div><br>
</div>
<div>A tunnel is not always going over shortest path. Some tunnels are TE t=
unnels and are deliberately not going over a shortest path. This is somethi=
ng that=C2=A0<span style=3D"COLOR:rgb(31,73,125)">draft-rosen-idr-tunnel-en=
caps-00=C2=A0</span>will not help to signal
 because the tunnel-encap attribute indicates tunnel parameters used by the=
 tail-end.</div>
<div><br>
</div>
<div>If a redirect tunnel represents a particular redirect/steering service=
 (better delay, less packet loss, non-SRLG, more BW, etc=E2=80=A6) then it =
does become rather complex for BGP as signalling technology because a tunne=
l relationship is a unique between &#39;a headend&#39;
 and =E2=80=98a tailed&#39; device. It seems better to leave tunnel-setup t=
o dedicated tunnel-setup mechanisms like PCEP, SR, etc=E2=80=A6.</div>
<div><br>
</div>
<div>The draft redirect-to-PATH_ID is providing the means to signal a flow-=
based redirect/steering service, and have each recipient router identify us=
ing local recursion for the PATH_IDs the corresponding tunnels/redirect-inf=
o. This allows for tunnel setup
 complexity to be taken away from BGP, while at the same time BGP is doing =
what it is very good at doing: &quot;It signals a policy=E2=80=9D in reliab=
le fashion.</div>
</div>
<div><br>
</div>
<div>Kind Regards,</div>
<div>G/</div>
</div>
<div>
<div></div>
</div>
</div>
</div>
<div><br>
</div>
<div>&lt;&gt;send snip&lt;&gt;</div>
<div><br>
</div>
<div>When looking at:=C2=A0<span style=3D"COLOR:rgb(31,73,125)">draft-litko=
wski-idr-flowspec-interfaceset t</span>hen find that this is a signalling m=
ethod to identify on which interfaces the rule needs to be activated upon. =
It is orthogonal from Redirect-to-path.</div>
<div><br>
</div>
<div>Segment Routing is a fine technology to built shortest Path and TE tun=
nels. Traffic steering is much more then redirecting to a Segment ID.=C2=A0=
</div>
<div><br>
</div>
<div>Looking at the above, I see little logic in your proposal Robin.</div>
<div><br>
</div>
<div>G/</div>
<div><br>
</div>
<span>
<div style=3D"BORDER-BOTTOM:medium none;TEXT-ALIGN:left;BORDER-LEFT:medium =
none;PADDING-BOTTOM:0in;PADDING-LEFT:0in;PADDING-RIGHT:0in;FONT-FAMILY:Cali=
bri;COLOR:black;FONT-SIZE:12pt;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:me=
dium none;PADDING-TOP:3pt">
<span style=3D"FONT-WEIGHT:bold">From: </span>Lizhenbin &lt;<a href=3D"mail=
to:lizhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;<br>
<span style=3D"FONT-WEIGHT:bold">Date: </span>Monday 26 October 2015 at 17:=
19<br>
<span style=3D"FONT-WEIGHT:bold">To: </span>Gunter Van de Velde &lt;<a href=
=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunter=
.van_de_velde@alcatel-lucent.com</a>&gt;, Gunter Van De Velde &lt;<a href=
=3D"mailto:guntervandeveldecc@icloud.com" target=3D"_blank">guntervandeveld=
ecc@icloud.com</a>&gt;,
 Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">r=
obert@raszuk.net</a>&gt;<br>
<span style=3D"FONT-WEIGHT:bold">Cc: </span>&quot;<a href=3D"mailto:idr@iet=
f.org" target=3D"_blank">idr@ietf.org</a>&quot; &lt;<a href=3D"mailto:idr@i=
etf.org" target=3D"_blank">idr@ietf.org</a>&gt;, &quot;<a href=3D"mailto:rt=
gwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&quot; &lt;<a href=3D"mai=
lto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org=
</a>&quot; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@=
ietf.org</a>&gt;<br>
<span style=3D"FONT-WEIGHT:bold">Subject: </span>Regarding &quot;Semantics =
Independent&quot; Flowspec//=E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: [Idr] N=
ew draft - Flowspec Path Redirect<br>
</div>
<div><br>
</div>
<div>
<div lang=3D"ZH-CN">
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Hi Folks,</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">I think now the drafts of B=
GP Flowspec for redirect to VRF/IP/Tunnel keeps the traditional way to =C2=
=A0extend BGP Flowspec to redirect to an entity
 with explicit meaning which has been defined clearly in the existing work.=
 </span>
</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Now draft-vandevelde-idr-fl=
owspec-path-redirect is to introduce the Path ID which can represent many f=
orwarding entities. draft-litkowski-idr-flowspec-interfaceset
 is also to introduce the new =E2=80=9Cgroup ID=E2=80=9D concepts. </span><=
/p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">There will be the problem h=
ow to define the path ID and group ID. In fact, my early comments proposed =
the suggestion that we can reuse some
 work of segment routing and generalize the concept of Segment, then it </s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">can provide a base for the =
abstracted view of different forwarding entities. In order to explain the u=
sage, I proposed the draft draft-li-spring-segment-path-programming
 to try to explain the idea clearly. Since now </span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">segment ID can be the indic=
ator of interface, node, tunnel, if we do not map segment ID to MPLS label =
or IPv6 address, it can be an identifier
 of all kinds of forwarding entities in the control plane which can be used=
 outside.
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Please refer to the Please =
refer to =E2=80=9C5.=C2=A0 Usecases of Segment Path Programming=E2=80=9D of=
 draft-li-spring-segment-path-programming:
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- 5.3.=C2=A0 Steering Traf=
fic without Mapping Segment to Label: This is the usecase to use segment ID=
 to implement =E2=80=9Credirect to IP/Link=E2=80=9D.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- 5.4.=C2=A0 Centralized M=
apping Service to Tunnels: This is the usecase to use segment ID to impleme=
nt =E2=80=9Credirect to tunnel=E2=80=9D.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">If BGP Flowspec can carry m=
ultiple segment IDs which represent different links of nodes, it can implem=
ent =E2=80=9Credirect to interface group=E2=80=9D.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">So I think if we can consol=
idate work of draft-vandevelde-idr-flowspec-path-redirect/ draft-litkowski-=
idr-flowspec-interfaceset/ draft-li-spring-segment-path-programming
 to propose the draft of BGP Flowspec =E2=80=9CRedirect to Segment ID=E2=80=
=9D </span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">to implement =E2=80=9CSeman=
tics Independent=E2=80=9D Flowspec. The existing SRGB info advertisement an=
d SID allocation mechanism can be easily reused and enhanced
 to provide the base instead of defining the new idea and implementation of=
 </span>
</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Path ID/Group ID.</span></p=
>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Best Regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Zhenbin(Robin)</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
<div>
<div style=3D"BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOT=
TOM:0cm;PADDING-LEFT:0cm;PADDING-RIGHT:0cm;BORDER-TOP:#b5c4df 1pt solid;BOR=
DER-RIGHT:medium none;PADDING-TOP:3pt">
<p class=3D"MsoNormal"><b><span style=3D"FONT-SIZE:10pt">=E5=8F=91=E4=BB=B6=
=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D"FONT-SIZE:1=
0pt" lang=3D"EN-US"> VAN DE VELDE, Gunter (Gunter) [<a href=3D"mailto:gunte=
r.van_de_velde@alcatel-lucent.com" target=3D"_blank">mailto:gunter.van_de_v=
elde@alcatel-lucent.com</a>]
<br>
</span><b><span style=3D"FONT-SIZE:10pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"FONT-SIZE:10pt" l=
ang=3D"EN-US"> 2015</span><span style=3D"FONT-SIZE:10pt">=E5=B9=B4<span lan=
g=3D"EN-US">9</span>=E6=9C=88<span lang=3D"EN-US">28</span>=E6=97=A5<span l=
ang=3D"EN-US"> 20:29<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Lizhenbin; Gunter Van De Velde; Robert Raszuk<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">
idr@ietf.org</a>; <a href=3D"mailto:pce@ietf.org" target=3D"_blank">pce@iet=
f.org</a><br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: </span>=E7=AD=94=E5=A4=8D<span lang=3D"EN-US">: [Idr] New draft=
 - Flowspec Path Redirect</span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>=C2=A0</p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">Dear Zhenbin,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">For (1.) I=E2=80=99ll compose some m=
ore text in a -01 version of the existing draft to document Flowspec PATH=
=E2=80=93ID. I assumed that it was clear with text already
 in the document, however, confusion seems to happen nevertheless.=C2=A0</s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">For (2.) the indirection by abstract=
ion is the beauty of the idea and that is why its offering a more flexible =
solution then other idea&#39;s around the
 topic out there. Its an abstract forwarding indirection ID provided by BGP=
 flow spec. Existing technology (PCE, SR, RSVP, manual-config, orchestratio=
n, etc=E2=80=A6) can be used to create/signal/maintain/etc the tunnel/LSP/r=
edirect-next-hop per application/service.=C2=A0</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">The proposal=C2=A0<a href=3D"https:/=
/tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-00" target=
=3D"_blank"><span style=3D"FONT-FAMILY:=E5=AE=8B=E4=BD=93;FONT-SIZE:12pt">d=
raft-vandevelde-idr-flowspec-path-redirect-00</span></a>=C2=A0does
 not provide a label or encap information but recipient uses localised redi=
rect information from existing and fine working technologies.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">Btw, your statement below that only =
one Path-ID can be signalled is wrong and is to some degree documented in t=
he existing draft.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US">G/</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div style=3D"BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOT=
TOM:0cm;PADDING-LEFT:0cm;PADDING-RIGHT:0cm;BORDER-TOP:#b5c4df 1pt solid;BOR=
DER-RIGHT:medium none;PADDING-TOP:3pt">
<p class=3D"MsoNormal"><b><span style=3D"FONT-FAMILY:Calibri,sans-serif;COL=
OR:black" lang=3D"EN-US">From:
</span></b><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:black" lang=
=3D"EN-US">Lizhenbin<br>
<b>Date: </b>Monday 28 September 2015 13:16<br>
<b>To: </b>Gunter Van De Velde, Robert Raszuk<br>
<b>Cc: </b>&quot;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf=
.org</a>&quot;, Gunter Van de Velde, &quot;<a href=3D"mailto:pce@ietf.org" =
target=3D"_blank">pce@ietf.org</a>&quot;<br>
<b>Subject: </b></span><span style=3D"COLOR:black">=E7=AD=94=E5=A4=8D</span=
><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:black" lang=3D"EN-US">=
: [Idr] New draft - Flowspec Path Redirect</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
black;FONT-SIZE:10.5pt" lang=3D"EN-US"></span>=C2=A0</p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Hi Gunter and Robert,</span=
><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">We are also doing similar w=
ork. Regarding the draft, the major concern is as follows:</span><span styl=
e=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">1. What does the PATH_ID re=
present? Does it mean only tunnel/LSP or all possible forwarding path inclu=
ding tunnel/LSP, interface, VRF, nexthop,
 etc?</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">2. How to allocate the PATH=
_ID for the forwarding path?</span><span style=3D"COLOR:black" lang=3D"EN-U=
S"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">We think the forwarding beh=
avior for Flowspec is always actual forwarding concepts including VRF, next=
hop, etc. So we proposed =E2=80=98redirect to
 tunnel=E2=80=99 in similar way. But for PATH_ID you proposed is another wa=
y to generalize all possible forwarding path. It may be a new way to define=
 forwarding behavior for BGP Flowspec.</span><span style=3D"COLOR:black" la=
ng=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Regarding redirecting tunne=
l, we proposed several drafts for your reference:</span><span style=3D"COLO=
R:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-hao-idr-flowspec-n=
vo3-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-li-idr-mpls-path-p=
rogramming-01</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-li-spring-tunnel-s=
egment-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-chen-pce-pce-initi=
ated-ip-tunnel-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">-- draft-li-pce-tunnel-segm=
ent-00</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">As Weiguo mentioned, the &q=
uot;redirect to Tunnel&quot; for BGP Flowspec has been described briefly in=
 draft-hao-idr-flowspec-nvo3-00. We will split it
 into two drafts: 1. draft-hao-idr-flowspec-nvo3-01; 2. one independent dra=
ft to define the &quot;redirect to tunnel&quot; for BGP Flowspec.</span><sp=
an style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For &quot;redirect to tunne=
l&quot; for BGP flowspec, in fact there can be two types of such behaviors:=
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">1. Specify the tunnel type:=
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For this behavior, we will =
reuse the IP tunnel types defined in [draft-rosen-idr-tunnel-encaps-00] and=
 the MPLS tunnel types defined in [draft-li-idr-mpls-path-programming-01].<=
/span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">2. Specify the specific tun=
nel:</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For MPLS TE tunnel, there c=
an be multiple MPLS TE tunnels for a specific destination. The tunnel type =
may be not enough. Then it is necessary
 to specify the specific MPLS TE tunnel through Tunnel Identifier. [RFC3209=
] defined the Tunnel Identifier for MPLS TE tunnel. PCE-initiated LSP adopt=
ed the Tunnel Identifier for which tunnel ID can be allocated by PCE. [draf=
t-li-idr-mpls-path-programming-01]
 will try to reuse the tunnel identifier and define it in the tunnel attrib=
ute which can be used for &quot;redirect to tunnel&quot; in [draft-hao-idr-=
flowspec-nvo3-00].
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">For IP tunnel, there is alw=
ays only one IP forwarding path for a specific destination. So When define =
&quot;redirect to specific IP tunnel&quot; the nexthop
 plus the tunnel type may be enough in the existing deployment. As the deve=
lopment of IP tunnels, it may be popular to configure multiple IP tunnels f=
or the specific destination. For examples we can define multiple MPLS-in-UD=
P tunnels for which the destination
 is same and the port number can be different for the purpose of ECMP. In o=
rder to cope with such development, [draft-chen-pce-pce-initiated-ip-tunnel=
-00] is proposed to introduce the tunnel identifier for IP tunnels for whic=
h tunnel ID can also be allocated
 by PCE as the MPLS TE tunnel. It may be also reused in the tunnel attribut=
es for the &quot;redirect to tunnel&quot;.</span><span style=3D"COLOR:black=
" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">We think if it is only to t=
hink about &quot;redirect to tunnel&quot; for the BGP Flowspec there has al=
ready been much existing work and it is better to
 reuse them. </span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">In fact the existing work t=
o specify a specific tunnel the tunnel identifier is a combination with the=
 ingress address/egress address and tunnel
 ID. But for the draft draft-vandevelde-idr-flowspec-path-redirect-00, PATH=
_ID can be only one value to represent one tunnel. Recently we proposed the=
 drafts draft-li-spring-tunnel-segment-00/ draft-li-pce-tunnel-segment-00 i=
n which the segment ID/label can
 be allocated for a tunnel. This is also to use one value to represent a tu=
nnel. Now Segment Routing has defined many types segments which can map to =
different forwarding path such as interface, node, tunnel, etc. From my poi=
nt of view, the work to define Segment-ID/Label
 and PATH-ID for the forwarding path can be consolidated and incorporated i=
n the SRPING work. If we hope to define the generalized concept, maybe we c=
an define =E2=80=9CRedirect to Segment=E2=80=9D for the BGP Flowspec. In [d=
raft-li-idr-mpls-path-programming-01], we define
 the label combination attributes to map the service to the MPLS forwarding=
 path. Maybe it can be enhanced to SID stack attribute to map to general fo=
rwarding path which can be used for multiple BGP address family including B=
GP Flowspec.</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">This is about our thinking =
on the &quot;redirect to tunnel/path&quot; work. Hope to get your opinion o=
n it.
</span><span style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Best Regards,</span><span s=
tyle=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US">Zhenbin(Robin)</span><span =
style=3D"COLOR:black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY:Calibri,sans-serif;COLOR:=
rgb(31,73,125);FONT-SIZE:10.5pt" lang=3D"EN-US"></span><span style=3D"COLOR=
:black" lang=3D"EN-US"></span>=C2=A0</p>
<div style=3D"BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOT=
TOM:0cm;PADDING-LEFT:0cm;PADDING-RIGHT:0cm;BORDER-TOP:#b5c4df 1pt solid;BOR=
DER-RIGHT:medium none;PADDING-TOP:3pt">
<p class=3D"MsoNormal"><b><span style=3D"COLOR:black;FONT-SIZE:10pt">=E5=8F=
=91=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span style=3D=
"COLOR:black;FONT-SIZE:10pt" lang=3D"EN-US"> Idr [<a href=3D"mailto:idr-bou=
nces@ietf.org" target=3D"_blank">mailto:idr-bounces@ietf.org</a>]
</span><b><span style=3D"COLOR:black;FONT-SIZE:10pt">=E4=BB=A3=E8=A1=A8 </s=
pan></b><span style=3D"COLOR:black;FONT-SIZE:10pt" lang=3D"EN-US">Gunter Va=
n De Velde<br>
</span><b><span style=3D"COLOR:black;FONT-SIZE:10pt">=E5=8F=91=E9=80=81=E6=
=97=B6=E9=97=B4<span lang=3D"EN-US">:</span></span></b><span style=3D"COLOR=
:black;FONT-SIZE:10pt" lang=3D"EN-US"> 2015</span><span style=3D"COLOR:blac=
k;FONT-SIZE:10pt">=E5=B9=B4<span lang=3D"EN-US">9</span>=E6=9C=88<span lang=
=3D"EN-US">23</span>=E6=97=A5<span lang=3D"EN-US">
 20:44<br>
</span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span=
 lang=3D"EN-US"> Robert Raszuk<br>
</span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">
idr@ietf.org</a>; VAN DE VELDE, Gunter (Gunter)<br>
</span><b>=E4=B8=BB=E9=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Re: [Idr] New draft - Flowspec Path Redirect</span></span><span sty=
le=3D"COLOR:black" lang=3D"EN-US"></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"COLOR:black" lang=3D"EN-US"></span>=
=C2=A0</p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">Interresting question... I se=
e few options to address this. (And fwiw, i left this currently intentional=
ly out the text to see if some ideas pop-up to confirm or deny the ideas th=
e authors had on this topic)</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">The one which currently to me=
 resonates most is to treat the path-id similar as a traditional bgp next-h=
op address... Meaning, that if the receiving router does&#39;t have a &quot=
;valid&quot; entry in the locallised path-id table
 it treats flowspec rule as withdraw.</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">Decision on what is considere=
d &quot;valid&quot; is at first glance a local router decision.</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">If you have another proposal =
i would be happy to learn and see if it resonates.</span></p>
<p><span style=3D"COLOR:black" lang=3D"EN-US">Ciao,<br>
G/</span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"COLOR:black" lang=3D"EN-US"><br>
<br>
Sent using <a href=3D"https://cloudmagic.com/k/d/mailapp?ct=3Dpa&amp;cv=3D7=
.3.5&amp;pv=3D5.1.1&amp;source=3Demail_footer_2" target=3D"_blank">
CloudMagic Email</a> </span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"COLOR:#787878" lang=3D"EN-US">On Wed,=
 Sep 23, 2015 at 10:56 AM, Robert Raszuk &lt;<a href=3D"mailto:robert@raszu=
k.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:</span><span style=
=3D"COLOR:black" lang=3D"EN-US"></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"COLOR:black" lang=3D"EN-US"></span>=
=C2=A0</p>
<div>
<blockquote style=3D"MARGIN-TOP:5pt;MARGIN-BOTTOM:5pt">
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">He=
y Gunter,</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">Le=
t me ask you a question (which in fact also applies to redirect to<br>
next hop draft).</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">Wh=
at is the expected system action when the redirect path is down<br>
(assuming you have tools to detect it) or next hop you are redirecting<br>
it to is unreachable ?</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">I =
read your draft but other then definition of the encoding I was not<br>
able to find answers for this.</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">Th=
e original RFC5575 recommended redirect to local VRF which is just<br>
as loopback normally up and within that VRF your orchestration can<br>
redirect to next hop or path with whatever encapsulation you like.</span></=
p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">He=
re you (and redirect to next hop folks) are making a shortcut<br>
however in both works I have not seen a proper discussion nor<br>
definition of set of procedures which need to be executed upon your<br>
redirect entity failure.</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">I =
suggest both documents are updated with that before we proceed<br>
further with both proposals.</span></p>
<p style=3D"MARGIN-BOTTOM:12pt;BACKGROUND:white"><span style=3D"COLOR:black=
" lang=3D"EN-US">Cheers,<br>
R.<br>
<br>
<br>
<br>
<br>
</span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">On=
 Wed, Sep 23, 2015 at 10:18 AM, VAN DE VELDE, Gunter (Gunter)<br>
&lt;<a href=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_bl=
ank">gunter.van_de_velde@alcatel-lucent.com</a>&gt; wrote:<br>
&gt; Hi Folks,<br>
&gt;<br>
&gt; We have created a new draft to allow the capability to have Flowspec s=
ignal<br>
&gt; a redirect to tunnel/LSP.<br>
&gt;<br>
&gt; <a href=3D"https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-p=
ath-redirect-00" target=3D"_blank">
https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-00<=
/a><br>
&gt;<br>
&gt; The base principle is to use the indirection capability of BGP for pat=
h<br>
&gt; redirection.<br>
&gt;<br>
&gt; This proposal defines a new flowspec community to signal a redirect<br=
>
&gt; </span><span style=3D"COLOR:black">=E2=80=98<span lang=3D"EN-US">path-=
id</span>=E2=80=99<span lang=3D"EN-US">. This path-id is is either a 128bit=
 or 32bit value<br>
&gt; Assumed is that recipient router supporting path-id redirect have a<br=
>
&gt; localised path-id indexed table containing LSP/tunnel encapsulation<br=
>
&gt; information.<br>
&gt; Existing technology can be used to construct/create this table (LDP, S=
R,<br>
&gt; RSVP, manual-config, etc</span>=E2=80=A6<span lang=3D"EN-US">) on a re=
cipient router. The LSP/tunnel encap table<br>
&gt; is indexed using 32 or 128 bit values.<br>
&gt;<br>
&gt; Flowspec path-id community is used to activate a redirect LSP/tunnel a=
nd<br>
&gt; provide by indirection the LSP/tunnel information for the flowspec<br>
&gt; identified traffic towards the LSP/tunnel.<br>
&gt;<br>
&gt; Benefits:<br>
&gt;<br>
&gt; no need for signalling labels or extra encap in BGP<br>
&gt; Each path-id indexed LSP/tunnel table is a localised construct<br>
&gt; existing technology is used to construct the path-id indexed localised=
 table<br>
&gt; Compatibility with technologies already using 32 or 128 bit identifier=
s for<br>
&gt; paths and sessions<br>
&gt; Easy for flow spec to signal as it introduces no need to signal labels=
 etc</span>=E2=80=A6<span lang=3D"EN-US"><br>
&gt; no conflicts with existing label exchange technologies<br>
&gt;<br>
&gt; Feedback welcome.<br>
&gt;<br>
&gt; G/<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Idr mailing list<br>
&gt; <a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank=
">https://www.ietf.org/mailman/listinfo/idr</a><br>
&gt;</span></span></p>
<p style=3D"BACKGROUND:white"><span style=3D"COLOR:black" lang=3D"EN-US">__=
_____________________________________________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/idr</a></span></p>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
</span></div>
</div>
</div>
</div>
</div>
</span></div>
</blockquote>
</div>
</div>
</div>
</span>
</div>

</blockquote></div>

--f46d043c7d807a4f4e0523133718--


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From: <bruno.decraene@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Thread-Topic: New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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Subject: Re: [spring] New Version Notification for draft-ginsberg-spring-conflict-resolution-00.txt
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Les,

> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] > Sent: Saturda=
y, October 24, 2015 12:00 AM
>=20
> Bruno -
>=20
> When there is a conflict, the problem with trying to decide which
> advertisement should be preferred is that there really is no way of knowi=
ng
> with certainty which advertisement is the correct one.

Mostly agreed.
But I'm not that concerned about finding "the correct one" or the good one.
I'm concerned about the consequences of the error handling behavior.
I'd like that we evaluate them and possibly minimize the adverse consequenc=
es.

In the scenario where the Mapping Server (MS) advertise range of SIDs, the =
error handling of draft-ginsberg-spring-conflict-resolution introduces a si=
gnificant risk of breaking a significant part of the network. The error han=
dling of draft-ietf-isis-segment-routing-extensions do not.
So I'd like to better understand why you are proposing to change the spec a=
nd the implementations, and why in this specific direction.

In your email, you are arguing that some network deployment of MS would not=
 advertise range of SIDs, and in such condition the conflict and the conseq=
uences would be more limited.=20
Ok, but evaluating a different scenario does not address my point.

Finally, you are discussing the relative popularity of both deployments. Yo=
u are welcome to present data (facts) about this. If you don't, even though=
 I could have arguments, I don't see the value of discussing this because I=
 don't think that this is the point. Even if MS range are used by 20% of SP=
RING deployments, taking the risk to break the connectivity of this range o=
f routers (e.g. 100 routers or more), in case of a single error (typo or bu=
g) does not seem desirable.

In summary, as part of the error handling discussion, I'd like that we eval=
uate the consequences and possibly minimize the adverse ones. A network wid=
e breakage seems a large one to me.

-- Bruno

> You have made certain
> assumptions below as to what is the most advantageous preference - and in=
 a
> given scenario your assumptions may be quite reasonable. But here is an
> alternate scenario where I think different assumptions could be made with=
 an
> equal justification.
>=20
> Again consider a brown field deployment. SRMS is used to advertise SIDs f=
or
> those nodes which are not yet SR capable. So, for Node X which has a Node
> address of 1.1.1.1 SRMS might advertise:
>=20
>    1.1.1.1/32 100 range 1
>=20
> This in fact is the correct value and all is working well.
>=20
> At some point Node X gets upgraded to become SR capable. Part of the new
> configuration is to assign the SID locally, but in doing so the operator =
makes an
> error and configures:
>=20
>     1.1.1.1/32 200 range 1
>=20
> Because the operator wants to do "make before break" the SRMS
> advertisement is NOT removed when Node X is upgraded (there should be no
> rush to do so) - so we have a conflict. Using your logic below, network w=
ould
> switch to using SID 200 for 1.1.1.1/32 - which in fact is the wrong choic=
e.
>=20
> I think this scenario is just as plausible as the scenario you presented.
>=20
> You also seems to suggest that SRMS advertisements are far more likely to
> have ranges greater than 1, something like:
>=20
>    1.1.1.1/32 100 range 100
>=20
> but I think this assumption is questionable. For this to work, the follow=
ing
> things have to be true:
>=20
> 1)A significant set of the node addresses in the network have to fit with=
in the
> defined range
> 2)All the SIDs which are assigned (even locally) need to follow a monoton=
ically
> increasing mapping of address-to-SID
>=20
> There may be networks where the above constraints will be met - but I have
> seen enough deployments w irregular address assignments not to expect such
> regularity.
>=20
> I am not saying you are wrong - I am saying we can all come up with cases
> where a given set of rules offers advantages - but as there are many sets=
 of
> optimal rules depending on how your network is deployed/upgraded - any
> argument of this type is simply unresolvable. Every answer is advantageous
> under one set of conditions and disadvantageous under another set.
>=20
> HTH
>=20
>     Les
>=20
>=20
>=20
> > -----Original Message-----
> > From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
> > Sent: Friday, October 23, 2015 1:05 AM
> > To: Les Ginsberg (ginsberg)
> > Cc: spring@ietf.org
> > Subject: RE: New Version Notification for draft-ginsberg-spring-conflic=
t-
> > resolution-00.txt
> >
> > Les,
> >
> > Mapping Server (MS) is typically deployed in brown field deployments
> where
> > some routers are not (yet) Segment Routing (SR) compliant, i.e. LDP onl=
y.
> > In this scenario, the MS advertises the SIDs for the whole range of rou=
ter's
> > loopback.  The SR routers also advertise their own SID in Prefix-SID su=
b-TLV
> > attached to their loopback. Hence, in the nominal situation, SIDs are
> > advertised both by loopback owners and by the MS.
> >
> > In this situation, with a _single_ erroneous advertisement from the MS =
(e.g.
> > a typo from an operator or a software bug) _all_ the SID/Segments in the
> > network becomes in conflict.
> > draft-ginsberg-spring-conflict-resolution proposes 2 options:
> > a) ignore the SID in conflict
> > b) select one based on a tie-breaker
> >
> > "a" would result in all SID/Segments of the network to become invalidat=
ed.
> > i.e. breaking the whole MPLS network. In my view, this is not a desirab=
le
> > reaction, especially in reaction to a single error.
> > "b" seems better. Yet the tie-breaker does not make a distinction betwe=
en
> > Prefix-SID sub-TLV and MS advertisement. IMO Prefix-SID sub-TLV should =
be
> > privileged for 2 reasons:
> > - To learn a data from (node) X, I'd rather trust X itself rather than =
Y.
> > Especially from X point of view. (IOW, let me speak for myself)
> > - Prefix-SID sub-TLV advertises  a single SID while MS advertise many.
> > Assuming a single error (which seems reasonable as the network was
> > running correctly before), it seems less risky to take the risk for a s=
ingle SID
> > rather than for the whole MS advertisement.
> >
> >
> > That is also the opinion of draft-ietf-isis-segment-routing-extensions =
which
> > already specify this behavior:
> >    For a given prefix, if both a MS entry with its Prefix-SID Sub-TLV
> >    and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received, the
> >    Prefix-SID advertised within the Prefix TLV MUST be preferred while
> >    the MS entry MUST be ignored.
> >
> >
> > Bottom line, I don't understand why you are proposing to change this
> > specification. Could you please elaborate on your reasons and challenge
> > mines as needed?
> >
> > Thanks,
> > Regards;
> > Bruno
> >
> > > From: Les Ginsberg > Sent: Thursday, October 22, 2015 9:21 PM
> > >
> > > Bruno -
> > >
> > > In Section 3.2.5 of the draft:
> > >
> > > " ...   For other sources, It may seem intuitive to assign priority b=
ased on
> > >    point of origination (e.g. intra-area preferred over inter-area,
> > >    prefix reachability advertisements preferred over SRMS
> > >    advertisements, etc.).  However, any such policy makes it more lik=
ely
> > >    that inconsistent choices will be made by routers in the network a=
nd
> > >    increase the likelihood of forwarding loops or blackholes."
> > >
> > > If this point is agreed to then changes to the IGP drafts - such as
> > > the IS-IS SR draft section that you quoted (actually Section 2.4.5 of
> > > that draft) - would be necessary.
> > >
> > > So yes - it is our intent to have the protocol drafts changed if the
> > > conflict resolution language in this area is accepted.
> > >
> > >    Les
> > >
> > >
> > > > -----Original Message-----
> > > > From: bruno.decraene@orange.com
> > [mailto:bruno.decraene@orange.com]
> > > > Sent: Thursday, October 22, 2015 9:00 AM
> > > > To: Les Ginsberg (ginsberg)
> > > > Cc: spring@ietf.org
> > > > Subject: RE: New Version Notification for
> > > > draft-ginsberg-spring-conflict- resolution-00.txt
> > > >
> > > > Les,
> > > >
> > > > As an individual contributor, I have a clarification question
> > > > regarding
> > > Segment
> > > > Identifier Conflicts
> > > > https://tools.ietf.org/html/draft-ginsberg-spring-conflict-resolutio
> > > > n-
> > > > 00#section-3
> > > >
> > > > In the IGP, (Prefix, SID) mapping may be advertised via either
> > > > Prefix-SID (sub-TLV attached to an IP Prefix) or Mapping Server
> > > > (Mapping Server
> > > Prefix-
> > > > SID in the Binding TLV).
> > > > The draft generalizes both by defining and using a generalized
> > > > mapping entry.
> > > > Hence the draft seems to make no distinction between Prefix-SID and
> > > > Remote-Binding SID advertised by the Mapping Server. Is this a
> > > > correct understanding?
> > > >
> > > > OTOH, the "IS-IS Extensions for Segment Routing" IS-IS WG draft,
> > > > specify that a distinction must be made:
> > > > "   For a given prefix, if both a MS entry with its Prefix-SID Sub-=
TLV
> > > >    and a Prefix TLV (e.g.: TLV135) with its Prefix-SID are received=
, the
> > > >    Prefix-SID advertised within the Prefix TLV MUST be preferred wh=
ile
> > > >    the MS entry MUST be ignored."
> > > > https://tools.ietf.org/html/draft-ietf-spring-segment-routing-06#sec
> > > > tion-
> > > > 3.6.1
> > > >
> > > > So is your intention to:
> > > > - change the IS-IS specification to remove this rule (preference for
> > > > Prefix-
> > > SID
> > > > Sub-TLV)?
> > > > - or adapt your draft to accommodate for this rule?
> > > >
> > > > Thanks,
> > > > Regards,
> > > > Bruno
> > > >
> > > > > From: Les Ginsberg (ginsberg) > Sent: Wednesday, October 14, 2015
> > > > > 8:44 PM Folks -
> > > > >
> > > > > Would like to call your attention to this new draft.
> > > > >
> > > > >    Les
> > > > >
> > > > > -----Original Message-----
> > > > > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > > > > Sent: Wednesday, October 14, 2015 10:57 AM
> > > > > To: Peter Psenak (ppsenak); Les Ginsberg (ginsberg); Stefano
> > > > > Previdi
> > > > > (sprevidi)
> > > > > Subject: New Version Notification for
> > > > > draft-ginsberg-spring-conflict- resolution-00.txt
> > > > >
> > > > >
> > > > > A new version of I-D,
> > > > > draft-ginsberg-spring-conflict-resolution-00.txt
> > > > > has been successfully submitted by Les Ginsberg and posted to the
> > > > > IETF repository.
> > > > >
> > > > > Name:		draft-ginsberg-spring-conflict-resolution
> > > > > Revision:	00
> > > > > Title:		Segment Routing Conflict Resolution
> > > > > Document date:	2015-10-14
> > > > > Group:		Individual Submission
> > > > > Pages:		14
> > > > > URL:            https://www.ietf.org/internet-drafts/draft-ginsbe=
rg-spring-
> > > > conflict-
> > > > > resolution-00.txt
> > > > > Status:         https://datatracker.ietf.org/doc/draft-ginsberg-s=
pring-
> > conflict-
> > > > > resolution/
> > > > > Htmlized:       https://tools.ietf.org/html/draft-ginsberg-spring=
-conflict-
> > > > > resolution-00
> > > > >
> > > > >
> > > > > Abstract:
> > > > >    In support of Segment Routing (SR) routing protocols advertise=
 a
> > > > >    variety of identifiers used to define the segments which direct
> > > > >    forwarding of packets.  In cases where the information adverti=
sed by
> > > > >    a given protocol instance is either internally inconsistent or
> > > > >    conflicts with advertisements from another protocol instance a
> means
> > > > >    of achieving consistent forwarding behavior in the network is
> > > > >    required.  This document defines the policies used to resolve =
these
> > > > >    occurrences.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Please note that it may take a couple of minutes from the time of
> > > > > submission until the htmlized version and diff are available at
> > tools.ietf.org.
> > > > >
> > > > > The IETF Secretariat
> > > > >
> > > > > _______________________________________________
> > > > > spring mailing list
> > > > > spring@ietf.org
> > > > > https://www.ietf.org/mailman/listinfo/spring
> > > >
> > > >
> > __________________________________________________________
> > > >
> > __________________________________________________________
> > > > _____
> > > >
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> > > veuillez
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> > > > Orange decline
> > > toute
> > > > responsabilite si ce message a ete altere, deforme ou falsifie. Mer=
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> > > >
> > > > This message and its attachments may contain confidential or
> > > > privileged information that may be protected by law; they should not
> > > > be distributed, used or copied without authorisation.
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> >
> >
> > __________________________________________________________
> > __________________________________________________________
> > _____
> >
> > Ce message et ses pieces jointes peuvent contenir des informations
> > confidentielles ou privilegiees et ne doivent donc pas etre diffuses,
> exploites
> > ou copies sans autorisation. Si vous avez recu ce message par erreur,
> veuillez
> > le signaler a l'expediteur et le detruire ainsi que les pieces jointes.=
 Les
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> > Thank you.


___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.


From nobody Sat Oct 31 18:13:32 2015
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--_000_DD5FC8DE455C3348B94340C0AB5517334F8D370Ankgeml501mbschi_
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<html dir=3D"ltr">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dgb2312">
<style id=3D"owaParaStyle">P {
	MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px
}
</style>
</head>
<body style=3D"FONT-FAMILY: Calibri,sans-serif; WORD-WRAP: break-word; COLO=
R: rgb(0,0,0); FONT-SIZE: 14px" fPStyle=3D"1" ocsi=3D"0">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">
<p><font size=3D"3" face=3D"Times New Roman">Hi Gunter,</font></p>
<p><font size=3D"3" face=3D"Times New Roman">Understood your design method =
is to just specify PATH_ID in flowspec message, and let the routers do loca=
l recursive action to select a set of specific tunnel(s), the tunnel and PA=
TH_ID association should be configured
 beforehand at each router. The BGP flowspec initiator doesn't need to spec=
ify detail tunnel attributes, the flowspec message is tunnel semantic agnos=
tic. The router local decision is totally unrestrictive, the validation and=
 security seems to be hard to be
 controlled.</font></p>
<p><font size=3D"3" face=3D"Times New Roman">In traditional BGP flowspec de=
signing, BGP flowspec initiator specifies detail match fields and actions, =
the routers only enforce the actions without any flexibility for local deci=
sion. If using the traditional method,
 you worry about the complexity to specify detail tunnel attributes. </font=
></p>
<p><font size=3D"3" face=3D"Times New Roman">If the BGP flowspec initiator =
only cares about the redirect target IP address and tunnel type like NVO3, =
the tunnel attribute only need to include head-end information.
</font><font size=3D"3" face=3D"Times New Roman">The attribute can be descr=
ibed by <span style=3D"COLOR: rgb(31,73,125)">
draft-rosen-idr-tunnel-encaps-00, we only need to extend the draft usage fo=
r flowspec application.</span></font></p>
<p><font size=3D"3" face=3D"Times New Roman"><span style=3D"COLOR: rgb(31,7=
3,125)"><font color=3D"#000000">If the BGP flowspec initiator cares about t=
he redirect target IP address and other QOS attributes such as BW, we can s=
pecify the additional attribute using BGP
 to notify the router, then the router perform local tunnel selection per t=
he attribute.</font></span></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR: rgb(31,73,125)">In summary, i think the router local decision sh=
ould not be completely unrestrictive, the BGP flowspec initiator should spe=
cify some constraint tunnel attribute to
 restrict local tunnel selection. The most relaxing mode is to only specify=
 redirect target IP address. More strictly attribute specification will&nbs=
p;strengthen the constraint for each router's local tunnel selection. This =
method will faciliate the validation
 and security concern.</span></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR: rgb(31,73,125)"></span></font><font color=3D"#000000" size=3D"3"=
 face=3D"Times New Roman"><span style=3D"COLOR: rgb(31,73,125)">Thanks,</sp=
an></font></p>
<p><font color=3D"#000000" size=3D"3" face=3D"Times New Roman"><span style=
=3D"COLOR: rgb(31,73,125)">weiguo</span></font></p>
<p></p>
<hr tabindex=3D"-1">
<p></p>
<div style=3D"FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 16px=
">
<div style=3D"DIRECTION: ltr" id=3D"divRpF943520"><font size=3D"2" face=3D"=
Tahoma"><b>From:</b> Idr [idr-bounces@ietf.org] on behalf of VAN DE VELDE, =
Gunter (Gunter) [gunter.van_de_velde@alcatel-lucent.com]<br>
<b>Sent:</b> Tuesday, October 27, 2015 0:47<br>
<b>To:</b> Lizhenbin; Gunter Van De Velde; Robert Raszuk<br>
<b>Cc:</b> idr@ietf.org; spring@ietf.org; rtgwg@ietf.org<br>
<b>Subject:</b> Re: [Idr] Regarding &quot;Semantics Independent&quot; Flows=
pec//=B4=F0=B8=B4: =B4=F0=B8=B4: New draft - Flowspec Path Redirect<br>
</font><br>
</div>
<div></div>
<div>
<div>
<div>
<div>
<div>
<div>Let me just copy the answer I sent to another email I just sent to IDR=
:</div>
<div><br>
</div>
<div>&lt;&gt;start snip&lt;&gt;</div>
<div>Hi Robin,</div>
<div><br>
</div>
<div>Thanks for your note.</div>
<div><br>
</div>
<div>A tunnel is not always going over shortest path. Some tunnels are TE t=
unnels and are deliberately not going over a shortest path. This is somethi=
ng that&nbsp;<span style=3D"COLOR: rgb(31,73,125)">draft-rosen-idr-tunnel-e=
ncaps-00&nbsp;</span>will not help to signal
 because the tunnel-encap attribute indicates tunnel parameters used by the=
 tail-end.</div>
<div><br>
</div>
<div>If a redirect tunnel represents a particular redirect/steering service=
 (better delay, less packet loss, non-SRLG, more BW, etc=A1=AD) then it doe=
s become rather complex for BGP as signalling technology because a tunnel r=
elationship is a unique between 'a headend'
 and =A1=AEa tailed' device. It seems better to leave tunnel-setup to dedic=
ated tunnel-setup mechanisms like PCEP, SR, etc=A1=AD.</div>
<div><br>
</div>
<div>The draft redirect-to-PATH_ID is providing the means to signal a flow-=
based redirect/steering service, and have each recipient router identify us=
ing local recursion for the PATH_IDs the corresponding tunnels/redirect-inf=
o. This allows for tunnel setup
 complexity to be taken away from BGP, while at the same time BGP is doing =
what it is very good at doing: &quot;It signals a policy=A1=B1 in reliable =
fashion.</div>
</div>
<div><br>
</div>
<div>Kind Regards,</div>
<div>G/</div>
</div>
<div>
<div id=3D"MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>
</div>
<div><br>
</div>
<div>&lt;&gt;send snip&lt;&gt;</div>
<div><br>
</div>
<div>When looking at:&nbsp;<span style=3D"COLOR: rgb(31,73,125)">draft-litk=
owski-idr-flowspec-interfaceset t</span>hen find that this is a signalling =
method to identify on which interfaces the rule needs to be activated upon.=
 It is orthogonal from Redirect-to-path.</div>
<div><br>
</div>
<div>Segment Routing is a fine technology to built shortest Path and TE tun=
nels. Traffic steering is much more then redirecting to a Segment ID.&nbsp;=
</div>
<div><br>
</div>
<div>Looking at the above, I see little logic in your proposal Robin.</div>
<div><br>
</div>
<div>G/</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"BORDER-BOTTOM: medium none; TEXT-ALIGN: left; BORDER-LEFT: me=
dium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; FONT=
-FAMILY: Calibri; COLOR: black; FONT-SIZE: 12pt; BORDER-TOP: #b5c4df 1pt so=
lid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"FONT-WEIGHT: bold">From: </span>Lizhenbin &lt;<a href=3D"mai=
lto:lizhenbin@huawei.com" target=3D"_blank">lizhenbin@huawei.com</a>&gt;<br=
>
<span style=3D"FONT-WEIGHT: bold">Date: </span>Monday 26 October 2015 at 17=
:19<br>
<span style=3D"FONT-WEIGHT: bold">To: </span>Gunter Van de Velde &lt;<a hre=
f=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_blank">gunte=
r.van_de_velde@alcatel-lucent.com</a>&gt;, Gunter Van De Velde &lt;<a href=
=3D"mailto:guntervandeveldecc@icloud.com" target=3D"_blank">guntervandeveld=
ecc@icloud.com</a>&gt;,
 Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">r=
obert@raszuk.net</a>&gt;<br>
<span style=3D"FONT-WEIGHT: bold">Cc: </span>&quot;<a href=3D"mailto:idr@ie=
tf.org" target=3D"_blank">idr@ietf.org</a>&quot; &lt;<a href=3D"mailto:idr@=
ietf.org" target=3D"_blank">idr@ietf.org</a>&gt;, &quot;<a href=3D"mailto:r=
tgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&quot; &lt;<a href=3D"ma=
ilto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org=
</a>&quot; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@=
ietf.org</a>&gt;<br>
<span style=3D"FONT-WEIGHT: bold">Subject: </span>Regarding &quot;Semantics=
 Independent&quot; Flowspec//=B4=F0=B8=B4: =B4=F0=B8=B4: [Idr] New draft - =
Flowspec Path Redirect<br>
</div>
<div><br>
</div>
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<div lang=3D"ZH-CN">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Hi Folks,</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">I think now the drafts=
 of BGP Flowspec for redirect to VRF/IP/Tunnel keeps the traditional way to=
 &nbsp;extend BGP Flowspec to redirect to an
 entity with explicit meaning which has been defined clearly in the existin=
g work.
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Now draft-vandevelde-i=
dr-flowspec-path-redirect is to introduce the Path ID which can represent m=
any forwarding entities. draft-litkowski-idr-flowspec-interfaceset
 is also to introduce the new =A1=B0group ID=A1=B1 concepts. </span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">There will be the prob=
lem how to define the path ID and group ID. In fact, my early comments prop=
osed the suggestion that we can reuse
 some work of segment routing and generalize the concept of Segment, then i=
t </span>
</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">can provide a base for=
 the abstracted view of different forwarding entities. In order to explain =
the usage, I proposed the draft draft-li-spring-segment-path-programming
 to try to explain the idea clearly. Since now </span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">segment ID can be the =
indicator of interface, node, tunnel, if we do not map segment ID to MPLS l=
abel or IPv6 address, it can be an identifier
 of all kinds of forwarding entities in the control plane which can be used=
 outside.
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Please refer to the Pl=
ease refer to =A1=B05.&nbsp; Usecases of Segment Path Programming=A1=B1 of =
draft-li-spring-segment-path-programming:
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- 5.3.&nbsp; Steering=
 Traffic without Mapping Segment to Label: This is the usecase to use segme=
nt ID to implement =A1=B0redirect to IP/Link=A1=B1.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- 5.4.&nbsp; Centrali=
zed Mapping Service to Tunnels: This is the usecase to use segment ID to im=
plement =A1=B0redirect to tunnel=A1=B1.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">If BGP Flowspec can ca=
rry multiple segment IDs which represent different links of nodes, it can i=
mplement =A1=B0redirect to interface group=A1=B1.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">So I think if we can c=
onsolidate work of draft-vandevelde-idr-flowspec-path-redirect/ draft-litko=
wski-idr-flowspec-interfaceset/ draft-li-spring-segment-path-programming
 to propose the draft of BGP Flowspec =A1=B0Redirect to Segment ID=A1=B1 </=
span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">to implement =A1=B0Sem=
antics Independent=A1=B1 Flowspec. The existing SRGB info advertisement and=
 SID allocation mechanism can be easily reused and
 enhanced to provide the base instead of defining the new idea and implemen=
tation of
</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Path ID/Group ID.</spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Best Regards,</span></=
p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Zhenbin(Robin)</span><=
/p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
<div>
<div style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING=
-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1p=
t solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<p class=3D"MsoNormal"><b><span style=3D"FONT-SIZE: 10pt">=B7=A2=BC=FE=C8=
=CB<span lang=3D"EN-US">:</span></span></b><span style=3D"FONT-SIZE: 10pt" =
lang=3D"EN-US"> VAN DE VELDE, Gunter (Gunter) [<a href=3D"mailto:gunter.van=
_de_velde@alcatel-lucent.com" target=3D"_blank">mailto:gunter.van_de_velde@=
alcatel-lucent.com</a>]
<br>
</span><b><span style=3D"FONT-SIZE: 10pt">=B7=A2=CB=CD=CA=B1=BC=E4<span lan=
g=3D"EN-US">:</span></span></b><span style=3D"FONT-SIZE: 10pt" lang=3D"EN-U=
S"> 2015</span><span style=3D"FONT-SIZE: 10pt">=C4=EA<span lang=3D"EN-US">9=
</span>=D4=C2<span lang=3D"EN-US">28</span>=C8=D5<span lang=3D"EN-US"> 20:2=
9<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Lizhenbin; Gunter Van De Velde; Robert Raszuk<br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">
idr@ietf.org</a>; <a href=3D"mailto:pce@ietf.org" target=3D"_blank">pce@iet=
f.org</a><br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> Re: </span>=B4=F0=B8=B4<span lang=3D"EN-US">: [Idr] New draft - Flowspec =
Path Redirect</span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"></span>&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US">Dear Zhenbin,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US">For (1.) I=A1=AFll compose some=
 more text in a -01 version of the existing draft to document Flowspec PATH=
=A8CID. I assumed that it was clear with text
 already in the document, however, confusion seems to happen nevertheless.&=
nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US">For (2.) the indirection by abs=
traction is the beauty of the idea and that is why its offering a more flex=
ible solution then other idea's around
 the topic out there. Its an abstract forwarding indirection ID provided by=
 BGP flow spec. Existing technology (PCE, SR, RSVP, manual-config, orchestr=
ation, etc=A1=AD) can be used to create/signal/maintain/etc the tunnel/LSP/=
redirect-next-hop per application/service.&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US">The proposal&nbsp;<a href=3D"ht=
tps://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-00" t=
arget=3D"_blank"><span style=3D"FONT-FAMILY: =CB=CE=CC=E5; FONT-SIZE: 12pt"=
>draft-vandevelde-idr-flowspec-path-redirect-00</span></a>&nbsp;does
 not provide a label or encap information but recipient uses localised redi=
rect information from existing and fine working technologies.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US">Btw, your statement below that =
only one Path-ID can be signalled is wrong and is to some degree documented=
 in the existing draft.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US">G/</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING=
-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1p=
t solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<p class=3D"MsoNormal"><b><span style=3D"FONT-FAMILY: Calibri,sans-serif; C=
OLOR: black" lang=3D"EN-US">From:
</span></b><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLOR: black" la=
ng=3D"EN-US">Lizhenbin<br>
<b>Date: </b>Monday 28 September 2015 13:16<br>
<b>To: </b>Gunter Van De Velde, Robert Raszuk<br>
<b>Cc: </b>&quot;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf=
.org</a>&quot;, Gunter Van de Velde, &quot;<a href=3D"mailto:pce@ietf.org" =
target=3D"_blank">pce@ietf.org</a>&quot;<br>
<b>Subject: </b></span><span style=3D"COLOR: black">=B4=F0=B8=B4</span><spa=
n style=3D"FONT-FAMILY: Calibri,sans-serif; COLOR: black" lang=3D"EN-US">: =
[Idr] New draft - Flowspec Path Redirect</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: black; FONT-SIZE: 10.5pt" lang=3D"EN-US"></span>&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Hi Gunter and Robert,<=
/span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">We are also doing simi=
lar work. Regarding the draft, the major concern is as follows:</span><span=
 style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">1. What does the PATH_=
ID represent? Does it mean only tunnel/LSP or all possible forwarding path =
including tunnel/LSP, interface, VRF,
 nexthop, etc?</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p=
>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">2. How to allocate the=
 PATH_ID for the forwarding path?</span><span style=3D"COLOR: black" lang=
=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">We think the forwardin=
g behavior for Flowspec is always actual forwarding concepts including VRF,=
 nexthop, etc. So we proposed =A1=AEredirect
 to tunnel=A1=AF in similar way. But for PATH_ID you proposed is another wa=
y to generalize all possible forwarding path. It may be a new way to define=
 forwarding behavior for BGP Flowspec.</span><span style=3D"COLOR: black" l=
ang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Regarding redirecting =
tunnel, we proposed several drafts for your reference:</span><span style=3D=
"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- draft-hao-idr-flows=
pec-nvo3-00</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- draft-li-idr-mpls-p=
ath-programming-01</span><span style=3D"COLOR: black" lang=3D"EN-US"></span=
></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- draft-li-spring-tun=
nel-segment-00</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p=
>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- draft-chen-pce-pce-=
initiated-ip-tunnel-00</span><span style=3D"COLOR: black" lang=3D"EN-US"></=
span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">-- draft-li-pce-tunnel=
-segment-00</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">As Weiguo mentioned, t=
he &quot;redirect to Tunnel&quot; for BGP Flowspec has been described brief=
ly in draft-hao-idr-flowspec-nvo3-00. We will split
 it into two drafts: 1. draft-hao-idr-flowspec-nvo3-01; 2. one independent =
draft to define the &quot;redirect to tunnel&quot; for BGP Flowspec.</span>=
<span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">For &quot;redirect to =
tunnel&quot; for BGP flowspec, in fact there can be two types of such behav=
iors:</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">1. Specify the tunnel =
type:</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">For this behavior, we =
will reuse the IP tunnel types defined in [draft-rosen-idr-tunnel-encaps-00=
] and the MPLS tunnel types defined in
 [draft-li-idr-mpls-path-programming-01].</span><span style=3D"COLOR: black=
" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">2. Specify the specifi=
c tunnel:</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">For MPLS TE tunnel, th=
ere can be multiple MPLS TE tunnels for a specific destination. The tunnel =
type may be not enough. Then it is necessary
 to specify the specific MPLS TE tunnel through Tunnel Identifier. [RFC3209=
] defined the Tunnel Identifier for MPLS TE tunnel. PCE-initiated LSP adopt=
ed the Tunnel Identifier for which tunnel ID can be allocated by PCE. [draf=
t-li-idr-mpls-path-programming-01]
 will try to reuse the tunnel identifier and define it in the tunnel attrib=
ute which can be used for &quot;redirect to tunnel&quot; in [draft-hao-idr-=
flowspec-nvo3-00].
</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">For IP tunnel, there i=
s always only one IP forwarding path for a specific destination. So When de=
fine &quot;redirect to specific IP tunnel&quot;
 the nexthop plus the tunnel type may be enough in the existing deployment.=
 As the development of IP tunnels, it may be popular to configure multiple =
IP tunnels for the specific destination. For examples we can define multipl=
e MPLS-in-UDP tunnels for which
 the destination is same and the port number can be different for the purpo=
se of ECMP. In order to cope with such development, [draft-chen-pce-pce-ini=
tiated-ip-tunnel-00] is proposed to introduce the tunnel identifier for IP =
tunnels for which tunnel ID can
 also be allocated by PCE as the MPLS TE tunnel. It may be also reused in t=
he tunnel attributes for the &quot;redirect to tunnel&quot;.</span><span st=
yle=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">We think if it is only=
 to think about &quot;redirect to tunnel&quot; for the BGP Flowspec there h=
as already been much existing work and it is better
 to reuse them. </span><span style=3D"COLOR: black" lang=3D"EN-US"></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">In fact the existing w=
ork to specify a specific tunnel the tunnel identifier is a combination wit=
h the ingress address/egress address and
 tunnel ID. But for the draft draft-vandevelde-idr-flowspec-path-redirect-0=
0, PATH_ID can be only one value to represent one tunnel. Recently we propo=
sed the drafts draft-li-spring-tunnel-segment-00/ draft-li-pce-tunnel-segme=
nt-00 in which the segment ID/label
 can be allocated for a tunnel. This is also to use one value to represent =
a tunnel. Now Segment Routing has defined many types segments which can map=
 to different forwarding path such as interface, node, tunnel, etc. From my=
 point of view, the work to define
 Segment-ID/Label and PATH-ID for the forwarding path can be consolidated a=
nd incorporated in the SRPING work. If we hope to define the generalized co=
ncept, maybe we can define =A1=B0Redirect to Segment=A1=B1 for the BGP Flow=
spec. In [draft-li-idr-mpls-path-programming-01],
 we define the label combination attributes to map the service to the MPLS =
forwarding path. Maybe it can be enhanced to SID stack attribute to map to =
general forwarding path which can be used for multiple BGP address family i=
ncluding BGP Flowspec.</span><span style=3D"COLOR: black" lang=3D"EN-US"></=
span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">This is about our thin=
king on the &quot;redirect to tunnel/path&quot; work. Hope to get your opin=
ion on it.
</span><span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Best Regards,</span><s=
pan style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US">Zhenbin(Robin)</span><=
span style=3D"COLOR: black" lang=3D"EN-US"></span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: Calibri,sans-serif; COLO=
R: rgb(31,73,125); FONT-SIZE: 10.5pt" lang=3D"EN-US"></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span>&nbsp;</p>
<div style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING=
-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1p=
t solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<p class=3D"MsoNormal"><b><span style=3D"COLOR: black; FONT-SIZE: 10pt">=B7=
=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span></span></b><span style=3D"COLOR=
: black; FONT-SIZE: 10pt" lang=3D"EN-US"> Idr [<a href=3D"mailto:idr-bounce=
s@ietf.org" target=3D"_blank">mailto:idr-bounces@ietf.org</a>]
</span><b><span style=3D"COLOR: black; FONT-SIZE: 10pt">=B4=FA=B1=ED </span=
></b><span style=3D"COLOR: black; FONT-SIZE: 10pt" lang=3D"EN-US">Gunter Va=
n De Velde<br>
</span><b><span style=3D"COLOR: black; FONT-SIZE: 10pt">=B7=A2=CB=CD=CA=B1=
=BC=E4<span lang=3D"EN-US">:</span></span></b><span style=3D"COLOR: black; =
FONT-SIZE: 10pt" lang=3D"EN-US"> 2015</span><span style=3D"COLOR: black; FO=
NT-SIZE: 10pt">=C4=EA<span lang=3D"EN-US">9</span>=D4=C2<span lang=3D"EN-US=
">23</span>=C8=D5<span lang=3D"EN-US">
 20:44<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Robert Raszuk<br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:idr@ietf.org" target=3D"_blank">
idr@ietf.org</a>; VAN DE VELDE, Gunter (Gunter)<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> Re: [Idr] New draft - Flowspec Path Redirect</span></span><span style=3D"=
COLOR: black" lang=3D"EN-US"></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"COLOR: black" lang=3D"EN-US"></span>&=
nbsp;</p>
<p><span style=3D"COLOR: black" lang=3D"EN-US">Interresting question... I s=
ee few options to address this. (And fwiw, i left this currently intentiona=
lly out the text to see if some ideas pop-up to confirm or deny the ideas t=
he authors had on this topic)</span></p>
<p><span style=3D"COLOR: black" lang=3D"EN-US">The one which currently to m=
e resonates most is to treat the path-id similar as a traditional bgp next-=
hop address... Meaning, that if the receiving router does't have a &quot;va=
lid&quot; entry in the locallised path-id table
 it treats flowspec rule as withdraw.</span></p>
<p><span style=3D"COLOR: black" lang=3D"EN-US">Decision on what is consider=
ed &quot;valid&quot; is at first glance a local router decision.</span></p>
<p><span style=3D"COLOR: black" lang=3D"EN-US">If you have another proposal=
 i would be happy to learn and see if it resonates.</span></p>
<p><span style=3D"COLOR: black" lang=3D"EN-US">Ciao,<br>
G/</span></p>
<div id=3D"cm_signature">
<p class=3D"MsoNormal"><span style=3D"COLOR: black" lang=3D"EN-US"><br>
<br>
Sent using <a href=3D"https://cloudmagic.com/k/d/mailapp?ct=3Dpa&amp;cv=3D7=
.3.5&amp;pv=3D5.1.1&amp;source=3Demail_footer_2" target=3D"_blank">
CloudMagic Email</a> </span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"COLOR: #787878" lang=3D"EN-US">On Wed=
, Sep 23, 2015 at 10:56 AM, Robert Raszuk &lt;<a href=3D"mailto:robert@rasz=
uk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:</span><span styl=
e=3D"COLOR: black" lang=3D"EN-US"></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"COLOR: black" lang=3D"EN-US"></span>&=
nbsp;</p>
<div id=3D"oldcontent">
<blockquote style=3D"MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt">
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
Hey Gunter,</span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
Let me ask you a question (which in fact also applies to redirect to<br>
next hop draft).</span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
What is the expected system action when the redirect path is down<br>
(assuming you have tools to detect it) or next hop you are redirecting<br>
it to is unreachable ?</span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
I read your draft but other then definition of the encoding I was not<br>
able to find answers for this.</span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
The original RFC5575 recommended redirect to local VRF which is just<br>
as loopback normally up and within that VRF your orchestration can<br>
redirect to next hop or path with whatever encapsulation you like.</span></=
p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
Here you (and redirect to next hop folks) are making a shortcut<br>
however in both works I have not seen a proper discussion nor<br>
definition of set of procedures which need to be executed upon your<br>
redirect entity failure.</span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
I suggest both documents are updated with that before we proceed<br>
further with both proposals.</span></p>
<p style=3D"MARGIN-BOTTOM: 12pt; BACKGROUND: white"><span style=3D"COLOR: b=
lack" lang=3D"EN-US">Cheers,<br>
R.<br>
<br>
<br>
<br>
<br>
</span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
On Wed, Sep 23, 2015 at 10:18 AM, VAN DE VELDE, Gunter (Gunter)<br>
&lt;<a href=3D"mailto:gunter.van_de_velde@alcatel-lucent.com" target=3D"_bl=
ank">gunter.van_de_velde@alcatel-lucent.com</a>&gt; wrote:<br>
&gt; Hi Folks,<br>
&gt;<br>
&gt; We have created a new draft to allow the capability to have Flowspec s=
ignal<br>
&gt; a redirect to tunnel/LSP.<br>
&gt;<br>
&gt; <a href=3D"https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-p=
ath-redirect-00" target=3D"_blank">
https://tools.ietf.org/html/draft-vandevelde-idr-flowspec-path-redirect-00<=
/a><br>
&gt;<br>
&gt; The base principle is to use the indirection capability of BGP for pat=
h<br>
&gt; redirection.<br>
&gt;<br>
&gt; This proposal defines a new flowspec community to signal a redirect<br=
>
&gt; </span><span style=3D"COLOR: black">=A1=AE<span lang=3D"EN-US">path-id=
</span>=A1=AF<span lang=3D"EN-US">. This path-id is is either a 128bit or 3=
2bit value<br>
&gt; Assumed is that recipient router supporting path-id redirect have a<br=
>
&gt; localised path-id indexed table containing LSP/tunnel encapsulation<br=
>
&gt; information.<br>
&gt; Existing technology can be used to construct/create this table (LDP, S=
R,<br>
&gt; RSVP, manual-config, etc</span>=A1=AD<span lang=3D"EN-US">) on a recip=
ient router. The LSP/tunnel encap table<br>
&gt; is indexed using 32 or 128 bit values.<br>
&gt;<br>
&gt; Flowspec path-id community is used to activate a redirect LSP/tunnel a=
nd<br>
&gt; provide by indirection the LSP/tunnel information for the flowspec<br>
&gt; identified traffic towards the LSP/tunnel.<br>
&gt;<br>
&gt; Benefits:<br>
&gt;<br>
&gt; no need for signalling labels or extra encap in BGP<br>
&gt; Each path-id indexed LSP/tunnel table is a localised construct<br>
&gt; existing technology is used to construct the path-id indexed localised=
 table<br>
&gt; Compatibility with technologies already using 32 or 128 bit identifier=
s for<br>
&gt; paths and sessions<br>
&gt; Easy for flow spec to signal as it introduces no need to signal labels=
 etc</span>=A1=AD<span lang=3D"EN-US"><br>
&gt; no conflicts with existing label exchange technologies<br>
&gt;<br>
&gt; Feedback welcome.<br>
&gt;<br>
&gt; G/<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Idr mailing list<br>
&gt; <a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank=
">https://www.ietf.org/mailman/listinfo/idr</a><br>
&gt;</span></span></p>
<p style=3D"BACKGROUND: white"><span style=3D"COLOR: black" lang=3D"EN-US">=
_______________________________________________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/idr</a></span></p>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
</span></div>
</div>
</div>
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From: "VAN DE VELDE, Gunter (Gunter)" <gunter.van_de_velde@alcatel-lucent.com>
To: Haoweiguo <haoweiguo@huawei.com>, Lizhenbin <lizhenbin@huawei.com>, "Gunter Van De Velde" <guntervandeveldecc@icloud.com>, Robert Raszuk <robert@raszuk.net>
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Date: Tue, 27 Oct 2015 09:00:52 +0000
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Subject: [spring] Fwd:  Call for note-taker, jabber scribe, November 3 SPRING meeting
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Second request. Please consider volunteering.

Thanks,

--John

> Begin forwarded message:
>=20
> From: "John G. Scudder" <jgs@juniper.net>
> Subject: [spring] Call for note-taker, jabber scribe, November 3 =
SPRING meeting
> Date: October 15, 2015 at 3:08:58 AM GMT+9
> To: <spring@ietf.org>
>=20
> Hi All,
>=20
> As you know we will meet at IETF-94 on Tuesday November 3 at 09:00. =
Our agenda is very full and there is no chance we will make the best use =
of it if we don't have a note-taker arranged in advance. On some =
occasions I have picked up the slack myself rather than hold up the =
meeting, but I will be unable to do that this time.
>=20
> Can I ask for one or more of you to volunteer to take notes? I realize =
that in some cases, people are not comfortable volunteering since they =
want to be sure they will be able to participate in the Q/A, or because =
they are presenting. That is not an insurmountable problem though, if we =
have several volunteers they can cover for each other. The Etherpad tool =
is one good option for collaborative note-taking.
>=20
> It would also be helpful if someone would volunteer as Jabber scribe. =
This is limited to announcing what presentation is being given and =
relaying questions (if any) from the Jabber room to the mic, although of =
course if you want to you can do more.
>=20
> Please consider volunteering. Thanks in advance.
>=20
> --John
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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From: Lizhenbin <lizhenbin@huawei.com>
To: "spring@ietf.org" <spring@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: Solicit Comments on draft-li-spring-tunnel-segment-00 and draft-li-pce-tunnel-segment-00 
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Date: Sun, 1 Nov 2015 06:39:10 +0000
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Cc: "Chenxia \(D\)" <jescia.chenxia@huawei.com>, "Wunan \(Eric\)" <eric.wu@huawei.com>
Subject: [spring] Solicit Comments on draft-li-spring-tunnel-segment-00 and draft-li-pce-tunnel-segment-00
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10pt;">
<p>Hi Folks,</p>
<p>We proposes two drafts&nbsp;on the new type of segment in the segment ro=
uting: draft-li-spring-tunnel-segment-00 and draft-li-pce-tunnel-segment-00=
.
</p>
<p>-- draft-li-spring-tunnel-segment-00 proposes the possible usecases such=
 as reduce SID stack depth of SR path, span the non-SR domain or provide di=
fferentiated services. This document also proposes the difference between t=
he adjacency segment and the tunnel
 segment. These work will help to understand the necessity and advantages o=
f tunnel segment in some application scenarios. Then we define the forwardi=
ng mechanism and protocol extensions requirements on tunnel segment.
</p>
<p>-- draft-li-pce-tunnel-segment-00 proposes the possbile PCEP protocol ex=
tensions for the tunnel segment based on draft-li-spring-tunnel-segment-00.=
 The protocol extensions are introduced for two different applications: 1. =
PCEP extensiosn from PCC to PCE;
 2. PCEP extensions from PCE to PCC. </p>
<p>&nbsp;</p>
<p>Hope you could have interest in these drafts, help&nbsp;review or refine=
. You comments will be appreciated.
</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>Thanks &amp;&nbsp;Regards,</p>
<p>Zhenbin (Robin)</p>
</div>
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