
From francesco.fondelli@gmail.com  Tue Mar  1 09:01:46 2011
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From: Francesco Fondelli <francesco.fondelli@gmail.com>
To: Ramon Casellas <ramon.casellas@cttc.es>
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Subject: Re: [Pce] Question / issue PCEP port restriction - multiple PCEP adjacencies
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Hi All,

Where in RFC5440 is written that a PCE MUST reject an incoming connection
if the src port is not 4189? Nowhere if I'm not wrong. Let the OS pick
a random src port and be liberal in what you accept/receive.

"All PCEP messages MUST be sent using the registered TCP port for the
source and destination TCP port" is a very unfortunate statement but it's
about *sending* not receiving.

my 2 cents
Ciao
FF

On Mon, Feb 28, 2011 at 8:10 AM, Ramon Casellas <ramon.casellas@cttc.es> wrote:
> Fei, All,
>
> See my comments inline
>
> On 28/02/2011 7:48, zhang.fei3@zte.com.cn wrote:
>
> We verify the implementation in Linux again , just as Oscar said, different
> orders give different results.
>
> As a summary: even with the use of socket options, one cannot bind a client
> socket after binding a listening socket, portably.
>
> In practice this seems to affect GNU/Linux in particular and windows / *BSD
> seem to work ok, but the fact that e.g. java programs behave differently on
> different platforms is not good.
>
>
> Just my two cents, although it MUST be careful to change the description of
> standards, it seems that we SHOULD do so to cover all kinds of scenarios and
> for easy implementation if it is necessay.
>
> I tend to agree, this is not something trivial, but we can raise the issue
> in Prague. Although it is an important change, I would say that old
> implementations that bind source ports should work without change.
>
> It does affect implementations that enforce that the (remote) source port is
> 4189.
>
> According to Christian's mail and references within, the rationale for this
> does not seem to apply anymore and the use cases have changed/evolved (i.e.
> there are use cases with 2 ore more PCC 'processes' within a node)
>
> There are two potential changes: a) do not restrict source port and b) allow
> for parallel connections between nodes, the latter no longer being
> restricted by the former.
>
> IMHO a) should be discussed, b) is a more complex change and the
> implications may be different. A given implementation may (nonconforming-ly)
> allow different connections from the same IP address (e.g. NAT?)
>
>
> All comments welcome.
>
> Thank you
>
> R.
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>
>

From ramon.casellas@cttc.es  Tue Mar  1 09:48:13 2011
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Subject: Re: [Pce] Question / issue PCEP port restriction - multiple PCEP adjacencies
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On 01/03/2011 18:02, Francesco Fondelli wrote:
> Where in RFC5440 is written that a PCE MUST reject an incoming connection
> if the src port is not 4189? Nowhere if I'm not wrong. Let the OS pick
> a random src port and be liberal in what you accept/receive.
I agree, I was just trying to identify potential reasons for _not_ 
relaxing the requirement. It is not written, but I could not blame an 
implementor that chooses not to accept a non-compliant peer.

R


From Christian.Kaas-Petersen@tieto.com  Tue Mar  1 22:15:25 2011
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Thread-Topic: [Pce] Question / issue PCEP port restriction - multiple PCEP adjacencies
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Subject: Re: [Pce] Question / issue PCEP port restriction - multiple PCEP adjacencies
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Gentlemen,

The argument presented here is the kind of argument layers make.  The=20
text in RFC 5440 says, that a sender MUST use a specified source=20
port, and therefore a receiver also must expect that source port and hence =
ignore
other source ports.  We are not layers, but technical minded people, and
technical people should make a clear statement saying, that the party initi=
ating
a PCEP TCP session can use any source port, whereas the party=20
responding (ie listening part) must listen on the specified port.

Christian
________________________________________
From: pce-bounces@ietf.org [pce-bounces@ietf.org] On Behalf Of Ramon Casell=
as [ramon.casellas@cttc.es]
Sent: Tuesday, March 01, 2011 7:51 PM
To: Francesco Fondelli
Cc: pce@ietf.org
Subject: Re: [Pce] Question / issue PCEP port restriction - multiple PCEP a=
djacencies

On 01/03/2011 18:02, Francesco Fondelli wrote:
> Where in RFC5440 is written that a PCE MUST reject an incoming connection
> if the src port is not 4189? Nowhere if I'm not wrong. Let the OS pick
> a random src port and be liberal in what you accept/receive.
I agree, I was just trying to identify potential reasons for _not_
relaxing the requirement. It is not written, but I could not blame an
implementor that chooses not to accept a non-compliant peer.

R

_______________________________________________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce

From julien.meuric@orange-ftgroup.com  Mon Mar  7 03:31:48 2011
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Hi readers of the PCE list.

The request period for a time slot in the PCE agenda during IETF 80 is 
opened and will last till Monday March 14. If you need one, please sent 
an e-mail to the chairs and secretary, including the estimated duration, 
a title and/or the corresponding document name(s).

Please keep in mind that presentations must be focused on main issues 
and that minor refreshes of I-Ds already seen several times will be 
treated with lower priority in time allocation.

Beware of the deadlines (today for 00 versions):
# *2011-03-07 (Monday):* Internet Draft Cut-off for initial document 
(-00) submission by 17:00 PT (01:00 Tuesday, March 8 UTC), upload using 
IETF ID Submission Tool <https://datatracker.ietf.org/idst/upload.cgi>.
# *2011-03-14 (Monday):* Internet Draft final submission cut-off by 
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# *2011-03-18 (Friday):* Early Bird registration and payment cut-off at 
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# *2011-03-21 (Monday):* Revised Working Group agendas due by 17:00 PT 
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# *2011-03-21 (Monday):* Registration cancellation cut-off at 17:00 PT 
(01:00 Tuesday, March 22 UTC).
# *2011-03-25 (Friday):* Final Pre-Registration and Pre-Payment cut-off 
at 17:00 local meeting time.
# *2011-03-27 - 2011-04-01: 80th IETF Meeting in Prague, Czech Republic*.

Regards,

JP & Julien


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Subject: [Pce] New Liaison Statement, "LS274 - SG15 OTNT Standardization Work          Plan"
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Title: LS274 - SG15 OTNT Standardization Work Plan
Submission Date: 2011-03-09
URL of the IETF Web page: https://datatracker.ietf.org/public/liaison_detail.cgi?detail_id=1029 
Please reply by 2011-11-18

From: Greg Jones(ITU-T SG 15) <tsbsg15@itu.int>
To: IETF (CCAMP, PCE and MPLS WGs)(lberger@labn.net,dbrungard@att.com,jpv@cisco.com,rcallon@juniper.net,swallow@cisco.com,loa@pi.nu,julien.meuric@orange-ftgroup.com)
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yoichi.maeda@ttc.or.jp
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Reponse Contact: tsbsg15@itu.int
greg.jones@itu.int
hiroshi.ota@itu.int
Technical Contact: koike.yoshinori@lab.ntt.co.jp
Purpose: For comment 
Body: Thank you for your previous review and comments for ï¿½Optical Transport Networks & Technologies Standardization Work Planï¿½.  Attached is the updated version from this SG15 meeting (Geneva, 14-25 February 2011).  This version reflects recent development of related standards and your valuable input.  We appreciate your review of this latest version and comments.

Attachment: OTNT Standardization Work Plan, Issue 14 (TD408R1/PLEN)
Attachment(s):
     LS274 - SG15 OTNT Standardization Work Plan - pdf body (https://datatracker.ietf.org/documents/LIAISON/file1201.pdf)
     LS274 - SG15 OTNT Standardization Work Plan - pdf attach (https://datatracker.ietf.org/documents/LIAISON/file1202.pdf)




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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 Path Computation Element Working Group of the IETF.


	Title           : PCEP Requirements for WSON Routing and Wavelength Assignment
	Author(s)       : Y. Lee, et al.
	Filename        : draft-ietf-pce-wson-routing-wavelength-04.txt
	Pages           : 13
	Date            : 2011-03-10

This memo provides application-specific requirements for the Path
Computation Element communication Protocol (PCEP) for the support of
Wavelength Switched Optical Networks (WSON). Lightpath provisioning
in WSONs requires a routing and wavelength assignment (RWA) process.
>From a path computation perspective, wavelength assignment is the
process of determining which wavelength can be used on each hop of a
path and forms an additional routing constraint to optical light path
computation. Requirements for Optical impairments will be addressed
in a separate document.

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Dear All,

Please send your email to both co-chairs and please copy Dan King.

Thanks.

JP.

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	Title           : PCEP extensions for GMPLS
	Author(s)       : C. Margaria, et al.
	Filename        : draft-ietf-pce-gmpls-pcep-extensions-02.txt
	Pages           : 39
	Date            : 2011-03-11

This memo provides extensions for the Path Computation Element
communication Protocol (PCEP) for the support of GMPLS control plane.

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From wang.xuerong@zte.com.cn  Sun Mar 13 18:44:26 2011
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Subject: [Pce] New I-D : draft-wang-pce-inter-as-extentions-00.txt
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Dear all, 

We have uploaded a draft, which is about  extensions of Backward-Recursive 
PCE-Based Computation (BRPC) to support bidirectional  inter-AS LSP path 
computation.
 
I think it is important  to get bidirectional Inter-AS TE link information 
for inter-AS  path  computation.
 
If you are interested in this topic, hope you can have a look and review 
this draft.
URL : http://www.ietf.org/id/draft-wang-pce-inter-as-extentions-00.txt
 
We would like to appreciate your comments and suggestions.
 
Thanks
 Xuerong
 

 



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<br><font size=3 face="Arial">Dear all,&nbsp;</font>
<br>
<table width=100%>
<tr>
<td width=100% bgcolor=white><font size=3 face="Arial">We have uploaded
a draft, which is about &nbsp;extensions of Backward-Recursive PCE-Based
Computation (BRPC) to support bidirectional &nbsp;inter-AS LSP path &nbsp;computation.</font>
<br><font size=3>&nbsp;</font>
<br><font size=3 face="Arial">I think it is important &nbsp;to get bidirectional
Inter-AS TE link information for inter-AS &nbsp;path &nbsp;computation.</font>
<br><font size=3>&nbsp;</font>
<br><font size=3 face="Arial">If you are interested in this topic, hope
you can have a look and review this draft.</font>
<br><font size=3 face="Arial">URL&nbsp;: </font><a href="http://www.ietf.org/id/draft-pouyllau-pce-enhanced-errors-00.txt"><font size=3 color=blue face="Arial"><u>http://www.ietf.org/id/draft-wang-pce-inter-as-extentions-00.txt</u></font></a>
<br><font size=3>&nbsp;</font>
<br><font size=3 face="Arial">We would like to appreciate your comments
and suggestions.</font>
<br><font size=3>&nbsp;</font><font size=3 face="Arial"><br>
Thanks<br>
&nbsp;Xuerong<br>
&nbsp;<br>
</font></table>
<br><font size=2 face="sans-serif">&nbsp;</font>
<br>
<br><br><pre>
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Dear WG,

We had a discussion about adopting this document as a PCE WG document. =
Still, before proceeding
further, could tell us if you have plans to implement this MIB ?

Thanks.

JP and Julien.=

From dhruvd@huawei.com  Mon Mar 14 19:36:23 2011
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Date: Tue, 15 Mar 2011 08:07:07 +0530
From: Dhruv Dhody <dhruvd@huawei.com>
In-reply-to: <51BEC869-E938-47E0-9807-9A58447CA4B6@cisco.com>
To: 'JP Vasseur' <jpv@cisco.com>, pce@ietf.org, 'Julien Meuric' <julien.meuric@orange-ftgroup.com>
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Subject: Re: [Pce] Status of draft-dhody-pce-pcep-pathkey-mib-01
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Dear Co-chairs,

 

We have a plan to implement this MIB, request others in WG to give their
opinion! 

 

Regards,

Dhruv

 

Dhruv Dhody

Senior Technical Leader

Huawei Technologies,

Bangalore

+91-9845062422

 

This email and its attachments contain confidential information from HUAWEI,
which is intended only for the person or entity whose address is listed
above. Any use of the information contained here in any way (including, but
not limited to, total or partial disclosure, reproduction, or dissemination)
by persons other than the intended recipient(s) is prohibited. If you
receive this email in error, please notify the sender by phone or email
immediately and delete it!

 

 

-----Original Message-----
From: pce-bounces@ietf.org [mailto:pce-bounces@ietf.org] On Behalf Of JP
Vasseur
Sent: Monday, March 14, 2011 9:24 PM
To: pce@ietf.org
Subject: [Pce] Status of draft-dhody-pce-pcep-pathkey-mib-01

 

Dear WG,

 

We had a discussion about adopting this document as a PCE WG document.
Still, before proceeding

further, could tell us if you have plans to implement this MIB ?

 

Thanks.

 

JP and Julien.

_______________________________________________

Pce mailing list

Pce@ietf.org

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


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<p class=MsoPlainText><font size=2 face=Candara><span style='font-size:11.0pt;
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<p class=MsoPlainText><font size=2 face=Candara><span style='font-size:11.0pt;
font-family:Candara'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face=Candara><span style='font-size:11.0pt;
font-family:Candara'>We have a plan to implement this MIB, request others in WG
to give their opinion! <o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face=Candara><span style='font-size:11.0pt;
font-family:Candara'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face=Candara><span style='font-size:11.0pt;
font-family:Candara'>Regards,<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face=Candara><span style='font-size:11.0pt;
font-family:Candara'>Dhruv<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>Dhruv Dhody<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>Senior Technical Leader<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>Huawei Technologies,<o:p></o:p></span></font></p>

<p class=MsoPlainText><st1:City w:st="on"><st1:place w:st="on"><font size=2
  face="Courier New"><span style='font-size:10.0pt'>Bangalore</span></font></st1:place></st1:City><o:p></o:p></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>+91-9845062422<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>This email and its attachments contain confidential information from
HUAWEI, which is intended only for the person or entity whose address is listed
above. Any use of the information contained here in any way (including, but not
limited to, total or partial disclosure, reproduction, or dissemination) by
persons other than the intended recipient(s) is prohibited. If you receive this
email in error, please notify the sender by phone or email immediately and
delete it!<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>-----Original Message-----<br>
From: pce-bounces@ietf.org [mailto:pce-bounces@ietf.org] On Behalf Of <st1:PersonName
w:st="on">JP Vasseur</st1:PersonName><br>
Sent: Monday, March 14, 2011 9:24 PM<br>
To: pce@ietf.org<br>
Subject: [Pce] Status of draft-dhody-pce-pcep-pathkey-mib-01</span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>Dear WG,<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>We had a discussion about adopting this document as a PCE WG document.
Still, before proceeding<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>further, could tell us if you have plans to implement this MIB ?<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>Thanks.<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
10.0pt'>JP and Julien.<o:p></o:p></span></font></p>

<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
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<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
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<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
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<p class=MsoPlainText><font size=2 face="Courier New"><span style='font-size:
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Subject: [Pce] PCE - New Charter Proposal
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Dear WG,

Julien and I have discussed a proposal for PCE rechartering. Would you =
mind commenting before our WG meeting in Prague ? Thanks.

Description of Working Group:

The PCE Working Group is chartered to specify the required protocols so =
as
to enable a Path Computation Element  (PCE)-based architecture for the
computation of paths for MPLS and GMPLS  Point to Point and Point to =
Multi-
point Traffic Engineered LSPs.

In this architecture path computation does not necessarily occur on the
head-end (ingress) LSR, but on some other path computation entity that =
may
physically not be located on each head-end LSR.

The PCE WG works on application of this model within a single domain
or within a group of domains (where a domain is a layer, IGP area or
Autonomous System with limited visibility from the head-end LSR). At
this time, applying this model to large groups of domains such as the
Internet is not thought to be possible, and the PCE WG will not spend
energy on that topic.

The WG specifies the PCE communication Protocol (PCEP) and
needed extensions for communication between LSRs (termed Path
Computation Clients - PCCs) and PCEs, and between cooperating PCEs.
Security mechanisms such as authentication and confidentiality are
included.

The WG determines requirements for extensions to existing routing
and signaling protocols in support of PCE architecture and signaling of
inter-domain paths (e.g. RSVP-TE and its GMPLS variations). Any =
necessary
extensions will be produced in collaboration with the Working Groups
responsible for the protocols.

The WG also works on the mechanisms to for multi-layer path computation
and PCEP extensions for communication between several network layers.

The WG defines the required PCEP extensions for Wavelength Switched
Optical Networks (WSON) while keeping consistency with the GMPLS
architecture specified in the CCAMP WG.

Work Items:

- PCEP extensions for MPLS and GMPLS Traffic Engineered LSP path
computation models involving PCE(s). This includes the case of computing
the paths of intra and inter-domain TE LSPs. Such path computation =
includes
the generation of primary, protection and recovery paths, as well as
computations for (local/global) reoptimization and load balancing. Both
intra- and inter-domain applications are covered.
- In cooperation with protocol specific Working Group (e.g. MPLS, =
CCAMP),
development of LSP signaling (RSVP-TE) extensions required to support =
PCE-
based path computation models.
- Specification of PCEP extensions for communication in the various =
GMPLS-
controlled networks, including WSON.
- Definition of PCEP extensions for path computation in multi-layer
networks.

* To be discussed with the WG:
*1* Specification of PCEP extensions for VPN-specific uses.

Goals and Milestones:

June 2011    Submit WSON requirements to the IESG to be considered as an =
Informational RFC
June 2011    Submit vendor constraints in PCEP to the IESG to be =
considered as a Proposed Standard
Sept 2011    Submit extensions for hierarchical PCE path computation =
model as WG document
Oct 2011    Submit PCEP extensions for WSON as WG I-D
Oct 2011    Submit the PCEP MIB to the IESG to be considered as a =
Proposed Standard
Nov 2011    Submit the discovery MIB to the IESG to be considered as a =
Proposed Standard
Nov 2011    Submit inter-layer extensions to the IESG to be considered =
as a Proposed Standard
Dec 2011    Submit inter-area/AS applicability statement to the IESG as =
an informational RFC
*1*Nov 2011    Submit VPN extensions as WG document
Jan 2012    Submit the GMPLS requirements to the IESG to be considered =
as an Informational RFC
Mar 2012    Submit PCEP extensions for GMPLS to the IESG to be =
considered as a Proposed Standard
May 2012    Submit PCEP extensions for WSON to the IESG to be considered =
as a Proposed Standard
Jul 2012    Submit P2MP MIB to the IESG to be considered as a Proposed =
Standard
Oct 2012    Submit VPN extensions to the IESG to be considered as a =
Proposed Standard
Jan 2013    Submit extensions for hierarchical model to the IESG to be =
considered as a Proposed Standard
Feb 2013    Evaluate WG progress, recharter or close=

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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear =
WG,<div><br></div><div>Julien and I have discussed a proposal for PCE =
rechartering. Would you mind commenting before our WG meeting in Prague =
? Thanks.</div><div><br></div><div>Description of Working =
Group:<br><br>The PCE Working Group is chartered to specify the required =
protocols so as<br>to enable a Path Computation Element&nbsp; =
(PCE)-based architecture for the<br>computation of paths for MPLS and =
GMPLS&nbsp; Point to Point and Point to Multi-<br>point Traffic =
Engineered LSPs.<br><br>In this architecture path computation does not =
necessarily occur on the<br>head-end (ingress) LSR, but on some other =
path computation entity that may<br>physically not be located on each =
head-end LSR.<br><br>The PCE WG works on application of this model =
within a single domain<br>or within a group of domains (where a domain =
is a layer, IGP area or<br>Autonomous System with limited visibility =
from the head-end LSR). At<br>this time, applying this model to large =
groups of domains such as the<br>Internet is not thought to be possible, =
and the PCE WG will not spend<br>energy on that topic.<br><br>The WG =
specifies the PCE communication Protocol (PCEP) and<br>needed extensions =
for communication between LSRs (termed Path<br>Computation Clients - =
PCCs) and PCEs, and between cooperating PCEs.<br>Security mechanisms =
such as authentication and confidentiality are<br>included.<br><br>The =
WG determines requirements for extensions to existing routing<br>and =
signaling protocols in support of PCE architecture and signaling =
of<br>inter-domain paths (e.g. RSVP-TE and its GMPLS variations). Any =
necessary<br>extensions will be produced in collaboration with the =
Working Groups<br>responsible for the protocols.<br><br>The WG also =
works on the mechanisms to for multi-layer path computation<br>and PCEP =
extensions for communication between several network layers.<br><br>The =
WG defines the required PCEP extensions for Wavelength =
Switched<br>Optical Networks (WSON) while keeping consistency with the =
GMPLS<br>architecture specified in the CCAMP WG.<br><br>Work =
Items:<br><br>- PCEP extensions for MPLS and GMPLS Traffic Engineered =
LSP path<br>computation models involving PCE(s). This includes the case =
of computing<br>the paths of intra and inter-domain TE LSPs. Such path =
computation includes<br>the generation of primary, protection and =
recovery paths, as well as<br>computations for (local/global) =
reoptimization and load balancing. Both<br>intra- and inter-domain =
applications are covered.<br>- In cooperation with protocol specific =
Working Group (e.g. MPLS, CCAMP),<br>development of LSP signaling =
(RSVP-TE) extensions required to support PCE-<br>based path computation =
models.<br>- Specification of PCEP extensions for communication in the =
various GMPLS-<br>controlled networks, including WSON.<br>- Definition =
of PCEP extensions for path computation in =
multi-layer<br>networks.<br><br><b><i>* To be discussed with the =
WG:<br></i></b>*1* Specification of PCEP extensions for VPN-specific =
uses.<br><br>Goals and Milestones:<br><br>June 2011&nbsp;&nbsp;&nbsp; =
Submit WSON requirements to the IESG to be considered as =
an&nbsp;Informational RFC<br>June 2011&nbsp;&nbsp;&nbsp; Submit vendor =
constraints in PCEP to the IESG to be&nbsp;considered as a Proposed =
Standard<br>Sept 2011&nbsp;&nbsp;&nbsp; Submit extensions for =
hierarchical PCE path computation model as WG document<br>Oct =
2011&nbsp;&nbsp;&nbsp; Submit PCEP extensions for WSON as WG I-D<br>Oct =
2011&nbsp;&nbsp;&nbsp; Submit the PCEP MIB to the IESG to be considered =
as a&nbsp;Proposed Standard<br>Nov 2011&nbsp;&nbsp;&nbsp; Submit the =
discovery MIB to the IESG to be considered as a&nbsp;Proposed =
Standard<br>Nov 2011&nbsp;&nbsp;&nbsp; Submit inter-layer extensions to =
the IESG to be considered&nbsp;as a Proposed Standard<br>Dec =
2011&nbsp;&nbsp;&nbsp; Submit inter-area/AS applicability statement to =
the IESG as&nbsp;an informational RFC<br>*1*Nov 2011&nbsp;&nbsp;&nbsp; =
Submit VPN extensions as WG document<br>Jan 2012 &nbsp; &nbsp;Submit the =
GMPLS requirements to the IESG to be considered&nbsp;as an Informational =
RFC<br>Mar 2012&nbsp;&nbsp;&nbsp; Submit PCEP extensions for GMPLS to =
the IESG to be&nbsp;considered as a Proposed Standard<br>May =
2012&nbsp;&nbsp;&nbsp; Submit PCEP extensions for WSON to the IESG to be =
considered&nbsp;as a Proposed Standard<br>Jul 2012&nbsp;&nbsp;&nbsp; =
Submit P2MP MIB to the IESG to be considered as a =
Proposed&nbsp;Standard<br>Oct 2012&nbsp;&nbsp;&nbsp; Submit VPN =
extensions to the IESG to be considered as a&nbsp;Proposed =
Standard<br>Jan 2013 &nbsp; &nbsp;Submit extensions for hierarchical =
model to the IESG to&nbsp;be considered as a Proposed Standard<br>Feb =
2013 &nbsp; &nbsp;Evaluate WG progress, recharter or close</div>
</body></html>=

--Apple-Mail-255--251432629--

From Christian.Kaas-Petersen@tieto.com  Tue Mar 15 23:38:12 2011
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Thread-Topic: Suggestion for LABEL-SET object
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draft-ietf-pce-gmpls-pcep-extensions-02 introduces the LABEL-SET object, wh=
ich
may consist of two LABEL-SET TLVs.  In GMPLS it is often the case, that the
LABEL-SET for the downstream direction and the LABEL-SET for the upstream
direction are identical.  I suggest a LABEL-SET TLV to be provided with a B=
-bit
(B for bidirectional), such that one LABEL-SET TLV could represent both
directions.  This suggestion is not concerned with the saving of bytes on t=
he
wire, rather it concerns with consistency of upstream and downstream data.

Christian=

From julien.meuric@orange-ftgroup.com  Wed Mar 16 10:52:00 2011
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Hi PCE'rs.

The draft agenda for our upcoming meeting is on line: 
http://www.ietf.org/proceedings/80/agenda/pce.html

Please send your comments to the chairs and secretary by next Sunday, 
March 20.

Thanks

JP & Julien


From julien.meuric@orange-ftgroup.com  Mon Mar 21 04:12:25 2011
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Hi all.

If you have of slot in the PCE agenda, please send your slides to the 
chairs and secretary by next Friday, March 25th.

Try to focus them as much as possible and remember that efficient use of 
face to face meetings resides more in discussion than in presenting what 
is already in your draft.

Regards,

JP & Julien


Le 16/03/2011 18:53, Julien Meuric a écrit :
> Hi PCE'rs.
>
> The draft agenda for our upcoming meeting is on line: 
> http://www.ietf.org/proceedings/80/agenda/pce.html
>
> Please send your comments to the chairs and secretary by next Sunday, 
> March 20.
>
> Thanks
>
> JP & Julien
>

From olivier.dugeon@orange-ftgroup.com  Fri Mar 25 10:29:41 2011
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Subject: Re: [Pce] PCE - New Charter Proposal
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Dear all,

After implementing BRPC and studying inter-as PCE applicability, I=20
wonder if there would be an opportunity
in the new charter to introduce a study point on how to fulfil the=20
database of the PCE. Indeed, when using
BRPC across several domain (we play with around 10 AS in our labs) we=20
miss some important information. For
example, we must fulfil PCE database by hand to provision ASBR=20
information, inter link connectivity, IP
address of neighbour PCE, originating network prefix attached to the AS=20
and so on. I now that PCE database
is implementation specific, but these information are needed if we want=20
to optimize the BRPC process (e.g.
by avoiding to flood all PCE). So,I wonder if other peoples are=20
concerned by this problem and if a few study
point couldbe added to the new PCE charter. The idea would be to define=20
a new protocol or extensions to the
PCEP protocol to provide all relevant information to the PCE to run the=20
BRPC.

Regards,

Olivier

--=20
Olivier Dugeon
Senior Research Engineer, QoS and network control
Orange Labs

Le 03/15/11 09:38, JP Vasseur a =E9crit :
> Dear WG,
>
> Julien and I have discussed a proposal for PCE rechartering. Would you =

> mind commenting before our WG meeting in Prague ? Thanks.
>
> Description of Working Group:
>
> The PCE Working Group is chartered to specify the required protocols so=
 as
> to enable a Path Computation Element  (PCE)-based architecture for the
> computation of paths for MPLS and GMPLS  Point to Point and Point to=20
> Multi-
> point Traffic Engineered LSPs.
>
> In this architecture path computation does not necessarily occur on the=

> head-end (ingress) LSR, but on some other path computation entity that =
may
> physically not be located on each head-end LSR.
>
> The PCE WG works on application of this model within a single domain
> or within a group of domains (where a domain is a layer, IGP area or
> Autonomous System with limited visibility from the head-end LSR). At
> this time, applying this model to large groups of domains such as the
> Internet is not thought to be possible, and the PCE WG will not spend
> energy on that topic.
>
> The WG specifies the PCE communication Protocol (PCEP) and
> needed extensions for communication between LSRs (termed Path
> Computation Clients - PCCs) and PCEs, and between cooperating PCEs.
> Security mechanisms such as authentication and confidentiality are
> included.
>
> The WG determines requirements for extensions to existing routing
> and signaling protocols in support of PCE architecture and signaling of=

> inter-domain paths (e.g. RSVP-TE and its GMPLS variations). Any necessa=
ry
> extensions will be produced in collaboration with the Working Groups
> responsible for the protocols.
>
> The WG also works on the mechanisms to for multi-layer path computation=

> and PCEP extensions for communication between several network layers.
>
> The WG defines the required PCEP extensions for Wavelength Switched
> Optical Networks (WSON) while keeping consistency with the GMPLS
> architecture specified in the CCAMP WG.
>
> Work Items:
>
> - PCEP extensions for MPLS and GMPLS Traffic Engineered LSP path
> computation models involving PCE(s). This includes the case of computin=
g
> the paths of intra and inter-domain TE LSPs. Such path computation=20
> includes
> the generation of primary, protection and recovery paths, as well as
> computations for (local/global) reoptimization and load balancing. Both=

> intra- and inter-domain applications are covered.
> - In cooperation with protocol specific Working Group (e.g. MPLS, CCAMP=
),
> development of LSP signaling (RSVP-TE) extensions required to support P=
CE-
> based path computation models.
> - Specification of PCEP extensions for communication in the various GMP=
LS-
> controlled networks, including WSON.
> - Definition of PCEP extensions for path computation in multi-layer
> networks.
>
> */* To be discussed with the WG:
> /**1* Specification of PCEP extensions for VPN-specific uses.
>
> Goals and Milestones:
>
> June 2011    Submit WSON requirements to the IESG to be considered as=20
> an Informational RFC
> June 2011    Submit vendor constraints in PCEP to the IESG to=20
> be considered as a Proposed Standard
> Sept 2011    Submit extensions for hierarchical PCE path computation=20
> model as WG document
> Oct 2011    Submit PCEP extensions for WSON as WG I-D
> Oct 2011    Submit the PCEP MIB to the IESG to be considered as=20
> a Proposed Standard
> Nov 2011    Submit the discovery MIB to the IESG to be considered as=20
> a Proposed Standard
> Nov 2011    Submit inter-layer extensions to the IESG to be=20
> considered as a Proposed Standard
> Dec 2011    Submit inter-area/AS applicability statement to the IESG=20
> as an informational RFC
> *1*Nov 2011    Submit VPN extensions as WG document
> Jan 2012    Submit the GMPLS requirements to the IESG to be=20
> considered as an Informational RFC
> Mar 2012    Submit PCEP extensions for GMPLS to the IESG to=20
> be considered as a Proposed Standard
> May 2012    Submit PCEP extensions for WSON to the IESG to be=20
> considered as a Proposed Standard
> Jul 2012    Submit P2MP MIB to the IESG to be considered as a=20
> Proposed Standard
> Oct 2012    Submit VPN extensions to the IESG to be considered as=20
> a Proposed Standard
> Jan 2013    Submit extensions for hierarchical model to the IESG to be =

> considered as a Proposed Standard
> Feb 2013    Evaluate WG progress, recharter or close
>
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


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> example, we must fulfil PCE database by hand to provision ASBR 
> information, inter link connectivity, IP
> address of neighbour PCE, originating network prefix attached to the AS 
> and so on. I now that PCE database
(...)

> by avoiding to flood all PCE). So,I wonder if other peoples are 
> concerned 

(...)
> point couldbe added to the new PCE charter. The idea would be to define 
> a new protocol or extensions to the
> PCEP protocol

Dear Olivier, all

My 0.02 =E2=82=AC, for what is worth

Until now, our main approach (also shared by other implementors, afaict) is=
 either to behave as a passive OSPF-TE listener, to collocate the PCE in a =
node running OSPF, or to implement a (non-standard) interface (XML/SOAP) to=
 request the TED from a topology server. 

ABR / ASBRs are "indentified" by parsing External / Summary LSAs (which mea=
ns that not only AS/Area TE opaques must be parsed), along with the relevan=
t CIDR prefixes (we assume that control plane nodeids and router addresses =
-- as in OSPF-TLVs -- are equal). Inter-AS OSPF-TE links are "learnt" by pa=
rsing InterAS new TLV (rfc5392), although only in the outbound direction. T=
his has been "enough" to test BRPC and H-PCE in a multi-AS scenario, with r=
educed manual provisioning, but, as you say, in BRPC, PCE peers (along the =
prefixes / domains they are responsible for) are pre-configured at each PCE=
=2E In H-PCE, the mapping PCEs/domains/endpoints are announced in the OPEN wi=
th the parent.

However, when working on H-PCE, child PCEs cooperate to "build" the parent =
aggregated TED. In this sense, we have also implemented the possibility to =
wrap OSPF-TE (either full LSU packets or selected LSAs, including the adver=
tising router) within PCEP using a non standard Notification type / value a=
nd TLVs (alternatively the TED "pieces" are encoded as XML and also wrapped=
 in another TLV). CIDR Address prefixes for endpoint localization at the pa=
rent level are forwarded in ERO-like objects. This approach has worked on r=
elatively well, -- and I would like to discuss it within draft-h-pce-pcep -=
- but I am still unsure whether it should be included in the charter or not=
 (I would not object to it). I am not knowledgeable enough regarding IS-IS =
to elaborate.

I would also appreciate other PCE'rs feedback.

Best regards,
Ramon

-- 
Ramon Casellas, Ph.D.
Research Associate - Optical Networking Area -- http://wikiona.cttc.es
CTTC - Centre Tecnol=C3=B2gic de Telecomunicacions de Catalunya, PMT Ed B4
Av. Carl Friedrich Gauss 7 08860 Castelldefels (Barcelona) - Spain
Tel.: +34 93 645 29 16 -- Fax. +34 93 645 29 01

 
-- 




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Few comments:
1) What makes you think that you cannot enforce the set of domains that =
you want to explore with BRPC=20
using the IRO object specified in RFC5441?
2) If you have a mesh of domains and you try to compute the shortest =
inter-domain LSP according to some
metric, you just cannot afford not to explore all of them (unless you =
make use of some super-TED comprising=20
resources information on all domains). This is true whether you use of =
forward or backward path computation ?

I am trying to understand your claim about why forward computation would =
solve these problems ?

Thanks.

JP.=

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Dear Authors,

Thanks for your document. Quick question: when relaying the PCReq, why =
not simply
check the TED in the reverse direction and stop relying if constraints =
are not satisfied ?

Thanks.

JP.

On Mar 14, 2011, at 2:45 AM, wang.xuerong@zte.com.cn wrote:

>=20
> Dear all, =20
> We have uploaded a draft, which is about  extensions of =
Backward-Recursive PCE-Based Computation (BRPC) to support bidirectional =
 inter-AS LSP path  computation.=20
>  =20
> I think it is important  to get bidirectional Inter-AS TE link =
information for inter-AS  path  computation.=20
>  =20
> If you are interested in this topic, hope you can have a look and =
review this draft.=20
> URL : http://www.ietf.org/id/draft-wang-pce-inter-as-extentions-00.txt=20=

>  =20
> We would like to appreciate your comments and suggestions.=20
> =20
> Thanks
>  Xuerong
> =20
>=20
>  =20
>=20
>=20
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<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dear Authors,<div><br></div><div>Thanks for your document. Quick question: when relaying the PCReq, why not simply</div><div>check the TED in the reverse direction and stop relying if constraints are not satisfied ?</div><div><br></div><div>Thanks.</div><div><br></div><div>JP.</div><div><br><div><div>On Mar 14, 2011, at 2:45 AM, <a href="mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<br><font size="3" face="Arial">Dear all,&nbsp;</font>
<br>
<table width="100%">
<tbody><tr>
<td width="100%" bgcolor="white"><font size="3" face="Arial">We have uploaded
a draft, which is about &nbsp;extensions of Backward-Recursive PCE-Based
Computation (BRPC) to support bidirectional &nbsp;inter-AS LSP path &nbsp;computation.</font>
<br><font size="3">&nbsp;</font>
<br><font size="3" face="Arial">I think it is important &nbsp;to get bidirectional
Inter-AS TE link information for inter-AS &nbsp;path &nbsp;computation.</font>
<br><font size="3">&nbsp;</font>
<br><font size="3" face="Arial">If you are interested in this topic, hope
you can have a look and review this draft.</font>
<br><font size="3" face="Arial">URL&nbsp;: </font><a href="http://www.ietf.org/id/draft-pouyllau-pce-enhanced-errors-00.txt"><font size="3" color="blue" face="Arial"><u>http://www.ietf.org/id/draft-wang-pce-inter-as-extentions-00.txt</u></font></a>
<br><font size="3">&nbsp;</font>
<br><font size="3" face="Arial">We would like to appreciate your comments
and suggestions.</font>
<br><font size="3">&nbsp;</font><font size="3" face="Arial"><br>
Thanks<br>
&nbsp;Xuerong<br>
&nbsp;<br>
</font></td></tr></tbody></table>
<br><font size="2" face="sans-serif">&nbsp;</font>
<br>
<br><br><pre>--------------------------------------------------------
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</pre>_______________________________________________<br>Pce mailing list<br><a href="mailto:Pce@ietf.org">Pce@ietf.org</a><br><a href="https://www.ietf.org/mailman/listinfo/pce">https://www.ietf.org/mailman/listinfo/pce</a><br></blockquote></div><br></div></body></html>
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From: JP Vasseur <jpv@cisco.com>
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Subject: Re: [Pce] Comments on draft-chen-pce-forward-search-p2p-path-computation-00.txt
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Hi,

On Mar 28, 2011, at 10:32 PM, Huaimo Chen wrote:

> Hi JP,
>=20
>    Thanks for your comments!
>    My answers are inline below.
>=20
> Best Regards,
> Huaimo
> -----Original Message-----
> From: JP Vasseur [mailto:jpv@cisco.com]=20
> Sent: Monday, March 28, 2011 3:36 AM
> To: Huaimo Chen
> Cc: pce@ietf.org
> Subject: Comments on =
draft-chen-pce-forward-search-p2p-path-computation-00.txt
>=20
> Few comments:
> 1) What makes you think that you cannot enforce the set of domains =
that you want to explore with BRPC=20
> using the IRO object specified in RFC5441?
>=20
> Huaimo: This seems that there are some misunderstandings. I did not =
say that we could not enforce the sequence of domains or the set of =
domains that we want BRPC to explore using the IRO object. What I say is =
that the sequence of domains needs to be provided to BRPC in advance.=20
>=20

Not quite either, you could rely on BGP and furthermore this is =
orthogonal to the backward or
forward path computation aspect

> 2) If you have a mesh of domains and you try to compute the shortest =
inter-domain LSP according to some
> metric, you just cannot afford not to explore all of them (unless you =
make use of some super-TED comprising=20
> resources information on all domains). This is true whether you use of =
forward or backward path computation ?
>=20
> Huaimo: My understanding is that BRPC will explore all the possible =
sequence of domains, compute the shortest path for each sequence of =
domains and select the shortest one.

Not really, you could restrict the search or explore all of them.

> The forward search method works differently. It searches the shortest =
path in the way same as the normal CSPF does. It searches the special =
topology once and gets the shortest path. It will not explore all the =
possible sequence of domains.
>=20
> I am trying to understand your claim about why forward computation =
would solve these problems ?
>=20
> Huaimo: In the sense of that the forward search computation does not =
need any sequence of domains in advance, it guarantees that the path =
found is shortest, and it is efficient even for a topology of meshed =
domains.

But if you want to find the shortest constrained path and we have a mesh =
of domains, you still need to explore them all.

Thanks.

JP.

>=20
> Thanks.
>=20
> JP.


From huaimo.chen@huawei.com  Mon Mar 28 13:31:24 2011
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Hi JP,

    Thanks for your comments!
    My answers are inline below.

Best Regards,
Huaimo
-----Original Message-----
From: JP Vasseur [mailto:jpv@cisco.com] 
Sent: Monday, March 28, 2011 3:36 AM
To: Huaimo Chen
Cc: pce@ietf.org
Subject: Comments on draft-chen-pce-forward-search-p2p-path-computation-00.txt

Few comments:
1) What makes you think that you cannot enforce the set of domains that you want to explore with BRPC 
using the IRO object specified in RFC5441?

Huaimo: This seems that there are some misunderstandings. I did not say that we could not enforce the sequence of domains or the set of domains that we want BRPC to explore using the IRO object. What I say is that the sequence of domains needs to be provided to BRPC in advance. 
 
2) If you have a mesh of domains and you try to compute the shortest inter-domain LSP according to some
metric, you just cannot afford not to explore all of them (unless you make use of some super-TED comprising 
resources information on all domains). This is true whether you use of forward or backward path computation ?

Huaimo: My understanding is that BRPC will explore all the possible sequence of domains, compute the shortest path for each sequence of domains and select the shortest one. The forward search method works differently. It searches the shortest path in the way same as the normal CSPF does. It searches the special topology once and gets the shortest path. It will not explore all the possible sequence of domains.

I am trying to understand your claim about why forward computation would solve these problems ?

Huaimo: In the sense of that the forward search computation does not need any sequence of domains in advance, it guarantees that the path found is shortest, and it is efficient even for a topology of meshed domains.

Thanks.

JP.

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From jpv@cisco.com  Mon Mar 28 22:36:56 2011
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From: JP Vasseur <jpv@cisco.com>
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Subject: [Pce] Compute ingress and egress backup LSP
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Thanks for your drafts. When proposing these solutions to the WG, you =
may want to
specify how the head-end router of the backup LSP gets the labels for =
the backup=20
LSPs ?

Thanks.

JP.=

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Hi,

On Mar 28, 2011, at 4:33 PM, <wang.xuerong@zte.com.cn> =
<wang.xuerong@zte.com.cn> wrote:

>=20
> Dear JP,=20
> There maybe several inter-AS links between two adjacent ASes, so we =
just selected some of them that can satisfy the constraints in both of =
the directions. Of cause, if all of the inter-as links can not satisfy =
the constraints, PCE will stop relying as you say,and will reply an =
PCRep
>=20
>    message including a NO-PATH object.=20
>  =20
> Thanks for your questions=20

Thanks for your reply - this s understood but precisely my point: why =
would you need
protocol extensions ?

thanks.

JP.

> Xuerong=20
>=20
>=20
>=20
>=20
> JP Vasseur <jpv@cisco.com>
> 2011-03-28 16:47
>=20
> =CA=D5=BC=FE=C8=CB
> wang.xuerong@zte.com.cn
> =B3=AD=CB=CD
> pce@ietf.org
> =D6=F7=CC=E2
> Re: [Pce] New I-D : draft-wang-pce-inter-as-extentions-00.txt
>=20
>=20
>=20
>=20
>=20
> Dear Authors,=20
>=20
> Thanks for your document. Quick question: when relaying the PCReq, why =
not simply=20
> check the TED in the reverse direction and stop relying if constraints =
are not satisfied ?=20
>=20
> Thanks.=20
>=20
> JP.=20
>=20
> On Mar 14, 2011, at 2:45 AM, wang.xuerong@zte.com.cn wrote:=20
>=20
>=20
> Dear all, =20
> We have uploaded a draft, which is about  extensions of =
Backward-Recursive PCE-Based Computation (BRPC) to support bidirectional =
 inter-AS LSP path  computation.=20
> =20
> I think it is important  to get bidirectional Inter-AS TE link =
information for inter-AS  path  computation.=20
> =20
> If you are interested in this topic, hope you can have a look and =
review this draft.=20
> URL : http://www.ietf.org/id/draft-wang-pce-inter-as-extentions-00.txt=20=

> =20
> We would like to appreciate your comments and suggestions.=20
>=20
> Thanks
> Xuerong
>=20
>=20
> =20
>=20
>=20
> --------------------------------------------------------
> ZTE Information Security Notice: The information contained in this =
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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
">Hi,<div><br><div><div>On Mar 28, 2011, at 4:33 PM, &lt;<a =
href=3D"mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a>&gt; =
&lt;<a =
href=3D"mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite">
<div>
<br><font size=3D"3">Dear JP,</font>
<br><font size=3D"2" face=3D"sans-serif">There maybe several inter-AS =
links between
two adjacent ASes, so we just selected some of them that can satisfy the
constraints in both of the directions. Of cause, if all of the inter-as
links can not satisfy the constraints, PCE will stop relying as you =
say,and
will reply an </font><font size=3D"3">PCRep</font>
<div>
<br><font size=3D"3">&nbsp; &nbsp;message including a NO-PATH =
object.</font>
<br><font size=3D"2" face=3D"sans-serif">&nbsp;</font>
<br><font size=3D"2" face=3D"sans-serif">Thanks for your =
questions</font>
<br></div></div></blockquote><div><br></div><div>Thanks for your reply - =
this s understood but precisely my point: why would you =
need</div><div>protocol extensions =
?</div><div><br></div><div>thanks.</div><div><br></div><div>JP.</div><br><=
blockquote type=3D"cite"><div><div><font size=3D"2" =
face=3D"sans-serif">Xuerong</font>
<br>
<br>
<br>
<br>
<br>
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td width=3D"35%"><font size=3D"1" face=3D"sans-serif"><b>JP Vasseur =
&lt;<a href=3D"mailto:jpv@cisco.com">jpv@cisco.com</a>&gt;</b>
</font><p><font size=3D"1" face=3D"sans-serif">2011-03-28 16:47</font>
</p></td><td width=3D"64%">
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=CA=D5=BC=FE=C8=CB</font></div>
</td><td><font size=3D"1" face=3D"sans-serif"><a =
href=3D"mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a></font>=

</td></tr><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=B3=AD=CB=CD</font></div>
</td><td><font size=3D"1" face=3D"sans-serif"><a =
href=3D"mailto:pce@ietf.org">pce@ietf.org</a></font>
</td></tr><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=D6=F7=CC=E2</font></div>
</td><td><font size=3D"1" face=3D"sans-serif">Re: [Pce] New I-D : =
draft-wang-pce-inter-as-extentions-00.txt</font></td></tr></tbody></table>=

<br>
<table>
<tbody><tr valign=3D"top">
<td>
</td><td></td></tr></tbody></table>
<br></td></tr></tbody></table>
<br>
<br>
<br><font size=3D"3">Dear Authors,</font>
<br>
<br><font size=3D"3">Thanks for your document. Quick question: when =
relaying
the PCReq, why not simply</font>
<br><font size=3D"3">check the TED in the reverse direction and stop =
relying
if constraints are not satisfied ?</font>
<br>
<br><font size=3D"3">Thanks.</font>
<br>
<br><font size=3D"3">JP.</font>
<br>
<br><font size=3D"3">On Mar 14, 2011, at 2:45 AM, </font><a =
href=3D"mailto:wang.xuerong@zte.com.cn"><font size=3D"3" =
color=3D"blue"><u>wang.xuerong@zte.com.cn</u></font></a><font size=3D"3">
wrote:</font>
<br>
<br><font size=3D"3" face=3D"Arial"><br>
Dear all, </font><font size=3D"3">&nbsp;</font>
<table width=3D"100%">
<tbody><tr>
<td width=3D"100%" bgcolor=3D"white"><font size=3D"3" face=3D"Arial">We =
have uploaded
a draft, which is about &nbsp;extensions of Backward-Recursive PCE-Based
Computation (BRPC) to support bidirectional &nbsp;inter-AS LSP path =
&nbsp;computation.</font><font size=3D"3">
<br>
 &nbsp;</font><font size=3D"3" face=3D"Arial"><br>
I think it is important &nbsp;to get bidirectional Inter-AS TE link =
information
for inter-AS &nbsp;path &nbsp;computation.</font><font size=3D"3"> <br>
 &nbsp;</font><font size=3D"3" face=3D"Arial"><br>
If you are interested in this topic, hope you can have a look and review
this draft.</font><font size=3D"3"> </font><font size=3D"3" =
face=3D"Arial"><br>
URL : </font><a =
href=3D"http://www.ietf.org/id/draft-pouyllau-pce-enhanced-errors-00.txt">=
<font size=3D"3" color=3D"blue" =
face=3D"Arial"><u>http://www.ietf.org/id/draft-wang-pce-inter-as-extention=
s-00.txt</u></font></a><font size=3D"3">
<br>
 &nbsp;</font><font size=3D"3" face=3D"Arial"><br>
We would like to appreciate your comments and suggestions.</font><font =
size=3D"3">
<br>
 </font><font size=3D"3" face=3D"Arial"><br>
Thanks<br>
 Xuerong<br>
 </font></td></tr></tbody></table>
<br><font size=3D"2" face=3D"sans-serif"><br>
 </font><font size=3D"3">&nbsp;<br>
<br>
</font>
<br><tt><font =
size=3D"3">--------------------------------------------------------<br>
ZTE Information Security Notice: The information contained in this mail
is solely property of the sender's organization. This mail communication
is confidential. Recipients named above are obligated to maintain =
secrecy
and are not permitted to disclose the contents of this communication to
others.<br>
This email and any files transmitted with it are confidential and =
intended
solely for the use of the individual or entity to whom they are =
addressed.
If you have received this email in error please notify the originator of
the message. Any views expressed in this message are those of the =
individual
sender.<br>
This message has been scanned for viruses and Spam by ZTE Anti-Spam =
system.<br>
</font></tt>
<br><font size=3D"3">_______________________________________________<br>
Pce mailing list</font><font size=3D"3" color=3D"blue"><u><br>
</u></font><a href=3D"mailto:Pce@ietf.org"><font size=3D"3" =
color=3D"blue"><u>Pce@ietf.org</u></font></a><font size=3D"3" =
color=3D"blue"><u><br>
</u></font><a href=3D"https://www.ietf.org/mailman/listinfo/pce"><font =
size=3D"3" =
color=3D"blue"><u>https://www.ietf.org/mailman/listinfo/pce</u></font></a>=

<br>
<br></div></div>
<br><pre>--------------------------------------------------------
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From: JP Vasseur <jpv@cisco.com>
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Subject: Re: [Pce] =?utf-8?b?562U5aSNOiBSZTogIOetlOWkjTogUmU6ICBOZXcgSS1EIDog?= =?utf-8?q?draft-wang-pce-inter-as-extentions-00=2Etxt?=
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I have a different read, but let's discuss ... and listen what the WG =
thinks.

On Mar 29, 2011, at 9:25 AM, wang.xuerong@zte.com.cn wrote:

>=20
> Hi,=20
> We need to extend PCEP as well as BRPC.=20
>=20
> With extending PCEP to distinguish and being compatible with the BRPC =
procedure defined in RFC5441, we introduce a new flag to indicate that =
the Inter-AS links which satisfy the congstraints must be carried in =
PCRep.=20
> We may carry the inter-as links in two ways,use ERO or define a new =
object(i.e. CRO in the draft).=20
>=20
> There may be less extensions by using ERO to carry the inter-AS links, =
but this method will also carry some repeated information.=20
>=20
> <Mail Attachment.gif>=20
> For example, there are more than one inter-AS links from R9 to AS2, =
and we assume that=20
> all the inter-AS links satisfy the constraints.=20
> VSPT computed by PCE3  is extended to include Inter-AS link from AS3 =
to AS2, some duplicated information as shown follwing:
>  =20
> <Mail Attachment.gif>=20
> If we define a new object,that will be more efficent:=20
> <Mail Attachment.gif>=20
>=20
>=20
> Besides of that,BRPC procedure will be extended to include follwing =
steps in red colour:=20
> <Mail Attachment.gif>=20
>=20
> <Mail Attachment.gif>=20
>=20
>=20
> Best Regards,=20
>=20
> Xuerong Wang=20
>=20
>=20
>=20
>=20
>=20
>=20
> JP Vasseur <jpv@cisco.com>
> 2011-03-29 13:40
>=20
> =CA=D5=BC=FE=C8=CB
> "<wang.xuerong@zte.com.cn>" <wang.xuerong@zte.com.cn>
> =B3=AD=CB=CD
> <pce@ietf.org>
> =D6=F7=CC=E2
> Re: [Pce] =B4=F0=B8=B4: Re:  New I-D : =
draft-wang-pce-inter-as-extentions-00.txt
>=20
>=20
>=20
>=20
>=20
> Hi,=20
>=20
> On Mar 28, 2011, at 4:33 PM, <wang.xuerong@zte.com.cn> =
<wang.xuerong@zte.com.cn> wrote:=20
>=20
>=20
> Dear JP,=20
> There maybe several inter-AS links between two adjacent ASes, so we =
just selected some of them that can satisfy the constraints in both of =
the directions. Of cause, if all of the inter-as links can not satisfy =
the constraints, PCE will stop relying as you say,and will reply an =
PCRep=20
>=20
>   message including a NO-PATH object.=20
> =20
> Thanks for your questions=20
>=20
> Thanks for your reply - this s understood but precisely my point: why =
would you need=20
> protocol extensions ?=20
>=20
> thanks.=20
>=20
> JP.=20
>=20
> Xuerong=20
>=20
>=20
>=20
> JP Vasseur <jpv@cisco.com>
> 2011-03-28 16:47
>=20
>=20
> =CA=D5=BC=FE=C8=CB
> wang.xuerong@zte.com.cn
> =B3=AD=CB=CD
> pce@ietf.org
> =D6=F7=CC=E2
> Re: [Pce] New I-D : draft-wang-pce-inter-as-extentions-00.txt
>=20
>=20
>=20
>=20
>=20
>=20
>=20
> Dear Authors,=20
>=20
> Thanks for your document. Quick question: when relaying the PCReq, why =
not simply=20
> check the TED in the reverse direction and stop relying if constraints =
are not satisfied ?=20
>=20
> Thanks.=20
>=20
> JP.=20
>=20
> On Mar 14, 2011, at 2:45 AM, wang.xuerong@zte.com.cn wrote:=20
>=20
>=20
> Dear all, =20
> We have uploaded a draft, which is about  extensions of =
Backward-Recursive PCE-Based Computation (BRPC) to support bidirectional =
 inter-AS LSP path  computation.=20
>=20
> I think it is important  to get bidirectional Inter-AS TE link =
information for inter-AS  path  computation.=20
>=20
> If you are interested in this topic, hope you can have a look and =
review this draft.=20
> URL : http://www.ietf.org/id/draft-wang-pce-inter-as-extentions-00.txt=20=

>=20
> We would like to appreciate your comments and suggestions.=20
>=20
> Thanks
> Xuerong
>=20
>=20
>=20
>=20
>=20
>=20
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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I =
have a different read, but let's discuss ... and listen what the WG =
thinks.<div><br><div><div>On Mar 29, 2011, at 9:25 AM, <a =
href=3D"mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a> =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite">
<br><font size=3D"2" face=3D"sans-serif">Hi,</font>
<br><font size=3D"2" face=3D"sans-serif">We need to extend PCEP as well =
as BRPC.</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">With extending PCEP to =
distinguish and
being compatible with the BRPC procedure defined in RFC5441, we =
introduce
a new flag to indicate that the Inter-AS links which satisfy the =
congstraints
must be carried in PCRep.</font>
<br><font size=3D"2" face=3D"sans-serif">We may carry the inter-as links =
in two
ways,use ERO or define a new object(i.e. CRO in the draft).</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">There may be less extensions by =
using
ERO to carry the inter-AS links, but this method will also carry some =
repeated
information. </font>
<br>
<br><span>&lt;Mail Attachment.gif&gt;</span>
<br><font size=3D"2" face=3D"sans-serif">For example, </font><font =
size=3D"2">there
are more than one inter-AS links from R9 to AS2, and we assume that =
</font>
<br><font size=3D"2">all the inter-AS links satisfy the =
constraints.</font>
<br><font size=3D"2" face=3D"Calibri">VSPT</font><font size=3D"2" =
face=3D"sans-serif">
</font><font size=3D"2" face=3D"Calibri">compute</font><font size=3D"2" =
face=3D"sans-serif">d
by PCE3</font><font size=3D"2" face=3D"Calibri"> &nbsp;is extended to =
include
Inter-AS link from AS3 to AS2</font><font size=3D"2">, some duplicated =
information
as shown follwing:<br>
 &nbsp;</font>
<br><span>&lt;Mail Attachment.gif&gt;</span>
<br><font size=3D"2" face=3D"sans-serif">If we define a new object,that =
will
be more efficent:</font>
<br><span>&lt;Mail Attachment.gif&gt;</span>
<br>
<br>
<br><font size=3D"2" face=3D"sans-serif">Besides of that,BRPC procedure =
will
be extended to include follwing steps in red colour:</font>
<br><span>&lt;Mail Attachment.gif&gt;</span>
<br>
<br><span>&lt;Mail Attachment.gif&gt;</span>
<br>
<br>
<br><font size=3D"2" face=3D"sans-serif">Best Regards,</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">Xuerong Wang</font>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td width=3D"35%"><font size=3D"1" face=3D"sans-serif"><b>JP Vasseur =
&lt;<a href=3D"mailto:jpv@cisco.com">jpv@cisco.com</a>&gt;</b>
</font><p><font size=3D"1" face=3D"sans-serif">2011-03-29 13:40</font>
</p></td><td width=3D"64%">
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=CA=D5=BC=FE=C8=CB</font></div>
</td><td><font size=3D"1" face=3D"sans-serif">"&lt;<a =
href=3D"mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a>&gt;"
&lt;<a =
href=3D"mailto:wang.xuerong@zte.com.cn">wang.xuerong@zte.com.cn</a>&gt;</f=
ont>
</td></tr><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=B3=AD=CB=CD</font></div>
</td><td><font size=3D"1" face=3D"sans-serif">&lt;<a =
href=3D"mailto:pce@ietf.org">pce@ietf.org</a>&gt;</font>
</td></tr><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=D6=F7=CC=E2</font></div>
</td><td><font size=3D"1" face=3D"sans-serif">Re: [Pce] =B4=F0=B8=B4: =
Re: &nbsp;New I-D
: =
draft-wang-pce-inter-as-extentions-00.txt</font></td></tr></tbody></table>=

<br>
<table>
<tbody><tr valign=3D"top">
<td>
</td><td></td></tr></tbody></table>
<br></td></tr></tbody></table>
<br>
<br>
<br><font size=3D"3" face=3D"sans-serif">Hi,</font>
<br>
<br><font size=3D"3" face=3D"sans-serif">On Mar 28, 2011, at 4:33 PM, =
&lt;</font><a href=3D"mailto:wang.xuerong@zte.com.cn"><font size=3D"3" =
color=3D"blue" =
face=3D"sans-serif"><u>wang.xuerong@zte.com.cn</u></font></a><font =
size=3D"3" face=3D"sans-serif">&gt;
&lt;</font><a href=3D"mailto:wang.xuerong@zte.com.cn"><font size=3D"3" =
color=3D"blue" =
face=3D"sans-serif"><u>wang.xuerong@zte.com.cn</u></font></a><font =
size=3D"3" face=3D"sans-serif">&gt;
wrote:</font>
<br>
<br><font size=3D"3" face=3D"sans-serif"><br>
Dear JP, </font><font size=3D"2" face=3D"sans-serif"><br>
There maybe several inter-AS links between two adjacent ASes, so we just
selected some of them that can satisfy the constraints in both of the =
directions.
Of cause, if all of the inter-as links can not satisfy the constraints,
PCE will stop relying as you say,and will reply an </font><font size=3D"3"=
 face=3D"sans-serif">PCRep
</font>
<br><font size=3D"3" face=3D"sans-serif"><br>
 &nbsp; message including a NO-PATH object. </font><font size=3D"2" =
face=3D"sans-serif"><br>
 </font><font size=3D"3" face=3D"sans-serif">&nbsp;</font><font size=3D"2"=
 face=3D"sans-serif"><br>
Thanks for your questions</font><font size=3D"3" face=3D"sans-serif"> =
</font>
<br>
<br><font size=3D"3" face=3D"sans-serif">Thanks for your reply - this s =
understood
but precisely my point: why would you need</font>
<br><font size=3D"3" face=3D"sans-serif">protocol extensions ?</font>
<br>
<br><font size=3D"3" face=3D"sans-serif">thanks.</font>
<br>
<br><font size=3D"3" face=3D"sans-serif">JP.</font>
<br>
<br><font size=3D"2" face=3D"sans-serif">Xuerong</font><font size=3D"3" =
face=3D"sans-serif">
<br>
<br>
<br>
<br>
</font>
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td width=3D"31%"><font size=3D"1" face=3D"sans-serif"><b>JP Vasseur =
&lt;</b></font><a href=3D"mailto:jpv@cisco.com"><font size=3D"1" =
color=3D"blue" =
face=3D"sans-serif"><b><u>jpv@cisco.com</u></b></font></a><font size=3D"1"=
 face=3D"sans-serif"><b>&gt;</b>
</font><p><font size=3D"1" face=3D"sans-serif">2011-03-28 =
16:47</font><font size=3D"3" face=3D"sans-serif">
</font>
</p></td><td width=3D"68%">
<br>
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td width=3D"8%">
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=CA=D5=BC=FE=C8=CB</font></div>
</td><td width=3D"91%"><a href=3D"mailto:wang.xuerong@zte.com.cn"><font =
size=3D"1" color=3D"blue" =
face=3D"sans-serif"><u>wang.xuerong@zte.com.cn</u></font></a><font =
size=3D"3" face=3D"sans-serif">
</font>
</td></tr><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=B3=AD=CB=CD</font></div>
</td><td><a href=3D"mailto:pce@ietf.org"><font size=3D"1" color=3D"blue" =
face=3D"sans-serif"><u>pce@ietf.org</u></font></a><font size=3D"3" =
face=3D"sans-serif">
</font>
</td></tr><tr valign=3D"top">
<td>
<div align=3D"right"><font size=3D"1" =
face=3D"sans-serif">=D6=F7=CC=E2</font></div>
</td><td><font size=3D"1" face=3D"sans-serif">Re: [Pce] New I-D : =
draft-wang-pce-inter-as-extentions-00.txt</font></td></tr></tbody></table>=

<br>
<br>
<table width=3D"100%">
<tbody><tr valign=3D"top">
<td width=3D"50%">
</td><td width=3D"50%"></td></tr></tbody></table>
<br></td></tr></tbody></table>
<br><font size=3D"3" face=3D"sans-serif"><br>
<br>
<br>
Dear Authors, <br>
<br>
Thanks for your document. Quick question: when relaying the PCReq, why
not simply <br>
check the TED in the reverse direction and stop relying if constraints
are not satisfied ? <br>
<br>
Thanks. <br>
<br>
JP. <br>
<br>
On Mar 14, 2011, at 2:45 AM, </font><a =
href=3D"mailto:wang.xuerong@zte.com.cn"><font size=3D"3" color=3D"blue" =
face=3D"sans-serif"><u>wang.xuerong@zte.com.cn</u></font></a><font =
size=3D"3" face=3D"sans-serif">
wrote: <br>
</font><font size=3D"3" face=3D"Arial"><br>
<br>
Dear all, </font><font size=3D"3" face=3D"sans-serif">&nbsp; </font>
<table width=3D"100%">
<tbody><tr>
<td width=3D"100%" bgcolor=3D"white"><font size=3D"3" face=3D"Arial">We =
have uploaded
a draft, which is about &nbsp;extensions of Backward-Recursive PCE-Based
Computation (BRPC) to support bidirectional &nbsp;inter-AS LSP path =
&nbsp;computation.</font><font size=3D"3" face=3D"sans-serif">
<br>
 </font><font size=3D"3" face=3D"Arial"><br>
I think it is important &nbsp;to get bidirectional Inter-AS TE link =
information
for inter-AS &nbsp;path &nbsp;computation.</font><font size=3D"3" =
face=3D"sans-serif">
<br>
 </font><font size=3D"3" face=3D"Arial"><br>
If you are interested in this topic, hope you can have a look and review
this draft.</font><font size=3D"3" face=3D"sans-serif"> </font><font =
size=3D"3" face=3D"Arial"><br>
URL : </font><a =
href=3D"http://www.ietf.org/id/draft-pouyllau-pce-enhanced-errors-00.txt">=
<font size=3D"3" color=3D"blue" =
face=3D"Arial"><u>http://www.ietf.org/id/draft-wang-pce-inter-as-extention=
s-00.txt</u></font></a><font size=3D"3" face=3D"sans-serif">
<br>
 </font><font size=3D"3" face=3D"Arial"><br>
We would like to appreciate your comments and suggestions.</font><font =
size=3D"3" face=3D"sans-serif">
</font><font size=3D"3" face=3D"Arial"><br>
<br>
Thanks<br>
Xuerong</font></td></tr></tbody></table>
<br><font size=3D"2" face=3D"sans-serif"><br>
</font><font size=3D"3" face=3D"sans-serif"><br>
 <br>
<br>
</font><tt><font size=3D"3"><br>
--------------------------------------------------------<br>
ZTE Information Security Notice: The information contained in this mail
is solely property of the sender's organization. This mail communication
is confidential. Recipients named above are obligated to maintain =
secrecy
and are not permitted to disclose the contents of this communication to
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This email and any files transmitted with it are confidential and =
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solely for the use of the individual or entity to whom they are =
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If you have received this email in error please notify the originator of
the message. Any views expressed in this message are those of the =
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sender.<br>
This message has been scanned for viruses and Spam by ZTE Anti-Spam =
system.</font></tt><font size=3D"3" face=3D"sans-serif"><br>
<br>
_______________________________________________<br>
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ZTE Information Security Notice: The information contained in this mail
is solely property of the sender's organization. This mail communication
is confidential. Recipients named above are obligated to maintain =
secrecy
and are not permitted to disclose the contents of this communication to
others.<br>
This email and any files transmitted with it are confidential and =
intended
solely for the use of the individual or entity to whom they are =
addressed.
If you have received this email in error please notify the originator of
the message. Any views expressed in this message are those of the =
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sender.<br>
This message has been scanned for viruses and Spam by ZTE Anti-Spam =
system.<br>
</font></tt>
<br><font size=3D"3" =
face=3D"sans-serif">_______________________________________________<br>
Pce mailing list</font><font size=3D"3" color=3D"blue" =
face=3D"sans-serif"><u><br>
</u></font><a href=3D"mailto:Pce@ietf.org"><font size=3D"3" color=3D"blue"=
 face=3D"sans-serif"><u>Pce@ietf.org</u></font></a><font size=3D"3" =
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<a =
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ilman/listinfo/pce</a></font>
<br>
<br>
<br><pre>--------------------------------------------------------
=
ZTE&nbsp;Information&nbsp;Security&nbsp;Notice:&nbsp;The&nbsp;information&=
nbsp;contained&nbsp;in&nbsp;this&nbsp;mail&nbsp;is&nbsp;solely&nbsp;proper=
ty&nbsp;of&nbsp;the&nbsp;sender's&nbsp;organization.&nbsp;This&nbsp;mail&n=
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This&nbsp;email&nbsp;and&nbsp;any&nbsp;files&nbsp;transmitted&nbsp;with&nb=
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From g.landi@nextworks.it  Tue Mar 29 03:02:48 2011
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Dear Ramon, all,

we also support the idea to extend the PCEP protocol with notifications for=
 specific topology information.
This could be particularly useful in hierarchical PCE deployments and could=
 also result in a vendor-independent way/mechanism/interface for feeding up=
 routing info.

We're adopting this approach mainly for updating info about inter-domain TE=
 links in the GEYSERS FP7 project (http://www.geysers.eu/). Moreover, the i=
nformation feed-up via PCNtf seems to work well also for the dynamic update=
 of additional TE information, e.g. related to power consumption of nodes a=
nd links (to be used to implement energy-aware routing) and network end-poi=
nts.

Perhaps, this WG re-chartering could be the opportunity for progressing the=
se discussions and try to converge towards common approaches.

Best regards,
Giada Landi


--
Giada Landi=20
R&D - Solutions Architect
Nextworks S.r.l.
Via F.Turati, 43/45
56125 - Pisa - Italy
www.nextworks.it
--






----- Original Message -----
From: "Ramon Casellas" <ramon.casellas@cttc.es>
To: pce@ietf.org
Sent: Friday, 25 March, 2011 18:50:05 GMT +01:00 Amsterdam / Berlin / Bern =
/ Rome / Stockholm / Vienna
Subject: Re: [Pce] PCE - New Charter Proposal

=20
> example, we must fulfil PCE database by hand to provision ASBR=20
> information, inter link connectivity, IP
> address of neighbour PCE, originating network prefix attached to the AS=
=20
> and so on. I now that PCE database
(...)

> by avoiding to flood all PCE). So,I wonder if other peoples are=20
> concerned=20

(...)
> point couldbe added to the new PCE charter. The idea would be to define=
=20
> a new protocol or extensions to the
> PCEP protocol

Dear Olivier, all

My 0.02 =E2=82=AC, for what is worth

Until now, our main approach (also shared by other implementors, afaict) is=
 either to behave as a passive OSPF-TE listener, to collocate the PCE in a =
node running OSPF, or to implement a (non-standard) interface (XML/SOAP) to=
 request the TED from a topology server.=20

ABR / ASBRs are "indentified" by parsing External / Summary LSAs (which mea=
ns that not only AS/Area TE opaques must be parsed), along with the relevan=
t CIDR prefixes (we assume that control plane nodeids and router addresses =
-- as in OSPF-TLVs -- are equal). Inter-AS OSPF-TE links are "learnt" by pa=
rsing InterAS new TLV (rfc5392), although only in the outbound direction. T=
his has been "enough" to test BRPC and H-PCE in a multi-AS scenario, with r=
educed manual provisioning, but, as you say, in BRPC, PCE peers (along the =
prefixes / domains they are responsible for) are pre-configured at each PCE=
. In H-PCE, the mapping PCEs/domains/endpoints are announced in the OPEN wi=
th the parent.

However, when working on H-PCE, child PCEs cooperate to "build" the parent =
aggregated TED. In this sense, we have also implemented the possibility to =
wrap OSPF-TE (either full LSU packets or selected LSAs, including the adver=
tising router) within PCEP using a non standard Notification type / value a=
nd TLVs (alternatively the TED "pieces" are encoded as XML and also wrapped=
 in another TLV). CIDR Address prefixes for endpoint localization at the pa=
rent level are forwarded in ERO-like objects. This approach has worked on r=
elatively well, -- and I would like to discuss it within draft-h-pce-pcep -=
- but I am still unsure whether it should be included in the charter or not=
 (I would not object to it). I am not knowledgeable enough regarding IS-IS =
to elaborate.

I would also appreciate other PCE'rs feedback.

Best regards,
Ramon

--=20
Ramon Casellas, Ph.D.
Research Associate - Optical Networking Area -- http://wikiona.cttc.es
CTTC - Centre Tecnol=C3=B2gic de Telecomunicacions de Catalunya, PMT Ed B4
Av. Carl Friedrich Gauss 7 08860 Castelldefels (Barcelona) - Spain
Tel.: +34 93 645 29 16 -- Fax. +34 93 645 29 01

=20
--=20



_______________________________________________
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From: "Margaria, Cyril (NSN - DE/Munich)" <cyril.margaria@nsn.com>
To: <pce@ietf.org>
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Subject: Re: [Pce] Compute ingress and egress backup LSP
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Hi,=20

I have an additional question=20

According to the document introduction the goal is  to use the PCE to
compute a backup ingress or egress node/detour path in case of P2MP and
P2P TE-LSP.

I would like to understand what is missing in doing the following
requests, using the topology shown in the PCEP IETF80 presentation
(http://tools.ietf.org/wg/pce/agenda?item=3Dagenda80.html,
http://tools.ietf.org/agenda/80/slides/pce-7.ppt) , slide number 7
=20
Request #1 :
o PCReq :=20
  - END-POINTS : CE3, leaf : CE1, CE2
o PCRep : =20
  - ERO : PE5....PE1,CE1=20
  - SERO : n..PE3,CE2
Request #2 (backup ingress) :=20
O PCReq :
  - END-POINTS : CE4, leaf : CE1,CE2
  - XRO : {F bit set, exclude : PE5)=20
  - RRO : PE5....PE1, CE1
  - SRRO : n..PE3,CE2
O PCRep :=20
  - ERO : PE6....PE1,CE1=20
  - SERO : n..PE3,CE2
Request #3 (backup egress) :=20
O PCReq :
  - END-POINTS : CE3, leaf : CE1,CE2
  - XRO : {F bit set, exclude : PE1, PE4)=20
  - RRO : PE5....PE1, CE1
  - SRRO : n..PE3,CE2
O PCRep :=20
  - ERO : PE6....PE2,CE1=20
  - SERO : n..PE4,CE2

The information provided in the response allow the PCC to identify the
backup nodes/detour routes, can you indicate which information is
missing?


> -----Original Message-----
> From: pce-bounces@ietf.org [mailto:pce-bounces@ietf.org] On Behalf Of
> ext JP Vasseur
> Sent: Tuesday, March 29, 2011 7:39 AM
> To: pce@ietf.org
> Subject: [Pce] Compute ingress and egress backup LSP
>=20
> Thanks for your drafts. When proposing these solutions to the WG, you
> may want to specify how the head-end router of the backup LSP gets the
> labels for the backup LSPs ?
>=20
> Thanks.
>=20
> JP.
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce

From huaimo.chen@huawei.com  Wed Mar 30 13:56:27 2011
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From: Huaimo Chen <huaimo.chen@huawei.com>
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Hi Cyril,

    Thanks for your email!
    My answer is inline below.

Best Regards,
Huaimo
-----Original Message-----
From: pce-bounces@ietf.org [mailto:pce-bounces@ietf.org] On Behalf Of Margaria, Cyril (NSN - DE/Munich)
Sent: Tuesday, March 29, 2011 11:04 AM
To: pce@ietf.org
Subject: Re: [Pce] Compute ingress and egress backup LSP

Hi, 

I have an additional question 

According to the document introduction the goal is  to use the PCE to
compute a backup ingress or egress node/detour path in case of P2MP and
P2P TE-LSP.

I would like to understand what is missing in doing the following
requests, using the topology shown in the PCEP IETF80 presentation
(http://tools.ietf.org/wg/pce/agenda?item=agenda80.html,
http://tools.ietf.org/agenda/80/slides/pce-7.ppt) , slide number 7
 
Request #1 :
o PCReq : 
  - END-POINTS : CE3, leaf : CE1, CE2
o PCRep :  
  - ERO : PE5....PE1,CE1 
  - SERO : n..PE3,CE2
Huaimo: This request should be for computing a P2MP TE LSP path from PE5 (Ingress) to PE1 (Egress) and PE3 (Egress).It seems that your request is for the P2MP path from CE3 (Ingress) to CE1 (Egress/Leaf) and CE2 (Egress/Leaf).

Request #2 (backup ingress) : 
O PCReq :
  - END-POINTS : CE4, leaf : CE1,CE2
  - XRO : {F bit set, exclude : PE5) 
  - RRO : PE5....PE1, CE1
  - SRRO : n..PE3,CE2
O PCRep : 
  - ERO : PE6....PE1,CE1 
  - SERO : n..PE3,CE2
Huaimo: This request should be for computing a backup ingress of the P2MP TE LSP in red color, which is from PE5 to PE1 and PE3. The reply for the request may just contain the backup ingress such as PE6 and backup path from the backup ingress such as PE6 to the next hop node of the ingress PE5. The request should indicate that the backup ingress computed must be able to get the same data that the ingress such as PE5 receives and imports into the P2MP TE LSP from a node (external source node), which may not be in the same domain as the ingress. 
It seems that your request does not have this information.

Request #3 (backup egress) : 
O PCReq :
  - END-POINTS : CE3, leaf : CE1,CE2
  - XRO : {F bit set, exclude : PE1, PE4) 
  - RRO : PE5....PE1, CE1
  - SRRO : n..PE3,CE2
O PCRep : 
  - ERO : PE6....PE2,CE1 
  - SERO : n..PE4,CE2
Huaimo: This request should be for computing a given set of backup egress nodes of the P2MP TE LSP. For example, we may request PCE to compute a backup egress for PE1 and a backup egress for PE3 in one request. In this case, we need to indicate that the backup egress for egress PE1 must have a connection to CE1, to which the data coming out from the egress PE1 of the P2MP TE LSP is sent; and the backup egress for egress PE3 must have a connection to CE3, to which the data coming out from egress PE3 of the P2MP TE LSP is sent.
It seems that your request does not have this information.

The information provided in the response allow the PCC to identify the
backup nodes/detour routes, can you indicate which information is
missing?


> -----Original Message-----
> From: pce-bounces@ietf.org [mailto:pce-bounces@ietf.org] On Behalf Of
> ext JP Vasseur
> Sent: Tuesday, March 29, 2011 7:39 AM
> To: pce@ietf.org
> Subject: [Pce] Compute ingress and egress backup LSP
> 
> Thanks for your drafts. When proposing these solutions to the WG, you
> may want to specify how the head-end router of the backup LSP gets the
> labels for the backup LSPs ?
> 
> Thanks.
> 
> JP.
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
_______________________________________________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce

From huaimo.chen@huawei.com  Wed Mar 30 14:44:10 2011
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From: Huaimo Chen <huaimo.chen@huawei.com>
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Hi JP,

    Thanks for your comments.
    My answers are inline below.

Best Regards,
Huaimo 

> -----Original Message-----
> From: JP Vasseur [mailto:jpv@cisco.com] 
> Sent: Monday, March 28, 2011 3:38 PM
> To: Huaimo Chen
> Cc: pce@ietf.org
> Subject: Re: Comments on 
> draft-chen-pce-forward-search-p2p-path-computation-00.txt
> 
> Hi,
> 
> On Mar 28, 2011, at 10:32 PM, Huaimo Chen wrote:
> 
> > Hi JP,
> > 
> >    Thanks for your comments!
> >    My answers are inline below.
> > 
> > Best Regards,
> > Huaimo
> > -----Original Message-----
> > From: JP Vasseur [mailto:jpv@cisco.com]
> > Sent: Monday, March 28, 2011 3:36 AM
> > To: Huaimo Chen
> > Cc: pce@ietf.org
> > Subject: Comments on 
> > draft-chen-pce-forward-search-p2p-path-computation-00.txt
> > 
> > Few comments:
> > 1) What makes you think that you cannot enforce the set of domains 
> > that you want to explore with BRPC using the IRO object 
> specified in RFC5441?
> > 
> > Huaimo: This seems that there are some misunderstandings. I 
> did not say that we could not enforce the sequence of domains 
> or the set of domains that we want BRPC to explore using the 
> IRO object. What I say is that the sequence of domains needs 
> to be provided to BRPC in advance. 
> > 
> 
> Not quite either, you could rely on BGP and furthermore this 
> is orthogonal to the backward or forward path computation aspect
> 
We can not rely on BGP. BGP does not have any TE information. 
Forward Search path computation and BRPC is not symetric in many aspects. For example, the former does not need any domain sequence, but the latter needs a sequence of domains.  The former guarantees that the path found from a source to a distination is shortest, but the latter may not (if the sequence of domains given to BRPC does not contain the shortest path from the source to the destination, then BRPC can not find the shortest path).

> > 2) If you have a mesh of domains and you try to compute the 
> shortest 
> > inter-domain LSP according to some metric, you just cannot 
> afford not 
> > to explore all of them (unless you make use of some 
> super-TED comprising resources information on all domains). 
> This is true whether you use of forward or backward path computation ?
> > 
> > Huaimo: My understanding is that BRPC will explore all the 
> possible sequence of domains, compute the shortest path for 
> each sequence of domains and select the shortest one.
> 
> Not really, you could restrict the search or explore all of them.

How do you restrict the search? 

> 
> > The forward search method works differently. It searches 
> the shortest path in the way same as the normal CSPF does. It 
> searches the special topology once and gets the shortest 
> path. It will not explore all the possible sequence of domains.
> > 
> > I am trying to understand your claim about why forward 
> computation would solve these problems ?
> > 
> > Huaimo: In the sense of that the forward search computation 
> does not need any sequence of domains in advance, it 
> guarantees that the path found is shortest, and it is 
> efficient even for a topology of meshed domains.
> 
> But if you want to find the shortest constrained path and we 
> have a mesh of domains, you still need to explore them all.

Not really. 

> 
> Thanks.
> 
> JP.
> 
> > 
> > Thanks.
> > 
> > JP.
> 
> 

From cyril.margaria@nsn.com  Thu Mar 31 02:07:58 2011
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X-List-Received-Date: Thu, 31 Mar 2011 09:07:59 -0000

Hi,=20
Thanks for your answer, I was not detailed enough, please see inline=20

<cut>=20
> I would like to understand what is missing in doing the following
> requests, using the topology shown in the PCEP IETF80 presentation
> (http://tools.ietf.org/wg/pce/agenda?item=3Dagenda80.html,
> http://tools.ietf.org/agenda/80/slides/pce-7.ppt) , slide number 7
>=20
> Request #1 :
> o PCReq :
>   - END-POINTS : CE3, leaf : CE1, CE2
    - IRO : PE5, link CE3-PE5, PE1, Link PE1-CE1, PE3, Link PE3-CE3
  =20
> o PCRep :
>   - ERO : PE5....PE1,CE1
>   - SERO : n..PE3,CE2
> Huaimo: This request should be for computing a P2MP TE LSP path from
> PE5 (Ingress) to PE1 (Egress) and PE3 (Egress).It seems that your
> request is for the P2MP path from CE3 (Ingress) to CE1 (Egress/Leaf)
> and CE2 (Egress/Leaf).
>=20
This is correct, I do request the path from the CE node,=20
the term ingress/egress can be misleading, it is not required that the
endpoint of the path are the LSP ingress/egress

this is the PCC which decide to create an LSP from PE.=20
I missed one important point here : the PE5, as LSP endpoint and likely
PCC,
want the path to go though him, hence the IRO (added to the message)


> Request #2 (backup ingress) :
> O PCReq :
>   - END-POINTS : CE4, leaf : CE1,CE2
>   - XRO : {F bit set, exclude : PE5)
>   - RRO : PE5....PE1, CE1
    - IRO : PE1, Link PE1-CE1, PE3, Link PE3-CE3

>   - SRRO : n..PE3,CE2
> O PCRep :
>   - ERO : PE6....PE1,CE1
>   - SERO : n..PE3,CE2
> Huaimo: This request should be for computing a backup ingress of the
> P2MP TE LSP in red color, which is from PE5 to PE1 and PE3.

Same here, the request is NOT matching the signaling path, this is
intentional
and do *not* mean that the LSP is required to have a 1:1 mapping between
PCReq
 endpoints and LSP ingress/egress.

> The reply
> for the request may just contain the backup ingress such as PE6 and
> backup path from the backup ingress such as PE6 to the next hop node
of
> the ingress PE5. The request should indicate that the backup ingress
> computed must be able to get the same data that the ingress such as
PE5
> receives and imports into the P2MP TE LSP from a node (external source
> node), which may not be in the same domain as the ingress.
> It seems that your request does not have this information.

This is correct, I forgot the IRO, its working with the IRO.


> Request #3 (backup egress) :
> O PCReq :
>   - END-POINTS : CE3, leaf : CE1,CE2
>   - XRO : {F bit set, exclude : PE1, PE4)

    - IRO : PE5, link CE3-PE5,

>   - RRO : PE5....PE1, CE1
>   - SRRO : n..PE3,CE2
> O PCRep :
>   - ERO : PE6....PE2,CE1
>   - SERO : n..PE4,CE2
> Huaimo: This request should be for computing a given set of backup
> egress nodes of the P2MP TE LSP. For example, we may request PCE to
> compute a backup egress for PE1 and a backup egress for PE3 in one
> request. In this case, we need to indicate that the backup egress for
> egress PE1 must have a connection to CE1, to which the data coming out
> from the egress PE1 of the P2MP TE LSP is sent; and the backup egress
> for egress PE3 must have a connection to CE3, to which the data coming
> out from egress PE3 of the P2MP TE LSP is sent.
> It seems that your request does not have this information.

This is also correct, the IRO is missing, this is a key point to force
the request to use the LSP ingress/egress.

Does it fit with the corrected request (IRO) and responses?

Best Regards


