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Hi,
I think it is very necessary to do this work in
IETF, Service Providers in China also expressed such requirements during the
technical exchanges.
I have delved into PCE.ppt in the link, however, I
can't find the following drafts, If anyone can share with me? Could you
please send me these drafts in e-mail, Thanks!
draft-mescal-pce-interas-00.txt
draft-mescal-pcp-interas-00.txt
draft-mescal-pceid-00.txt
Best Regards
Defeng Li
----- Original Message -----
Sent: Sunday, August 01, 2004 1:07
PM
Subject: PCE BOF - Thursday August 5,
13:00 to 15:00
Hi,
Just to let you know that the set of slides for the
PCE BOF will be available next Monday morning (http://www.olddog.co.uk/60/pce.ppt)
Cheers,
JP
and Adrian.
Path Computation Element BOF (PCE BOF)
60th IETF,
San Diego, August 2004
Routing Area Ads: Alex Zinin (zinin@psg.com),
Bill Fenner (fenner@research.att.com)
BOF
Chairs: JP Vasseur (jvasseur@cisco.com), Adrian Farrel (adrian@olddog.co.uk)
Description:
In certain MPLS TE networks it may be beneficial or desirable to have path
computation performed by a distinct node (termed the Path Computation
Element PCE) that is not the LSR that needs to know the path. This BOF
examines the scope of such function, what extensions to existing protocols
might required, what additional protocols may need to be developed, and
whether there is cuase and support for this work within the IETF.
Proposed WG Charter
Organizational Overview
The PCE
working group coordinates the work within the IETF of defining the
operation of path computation elements within the Internet. Path
computation elements are responsible for computing paths through IP
networks for uses such as traffic engineering so that a prime consumer of
such paths might be an MPLS-TE LSR. Areas of responsibility will include
the collection of attributes relevant to the computation of paths, the
discovery by LSRs of available path computation elements, the
communication
with LSRs for the request of path computation, the
collaboration between
path computation elements within the network, and
analysis of path
computation algorithms with a view to ensuring
consistency between computed
paths. The working group will work closely
with many working groups in the
Routing Area including the OSPF, IS-IS,
IDR, MPLS and CCAMP working groups.
Working Group Scope
The
PCE working group scope includes:
- Definition of Generalized Traffic
Engineered LSP paths computation
techniques involving Path Computation
Element(s). This includes the intra
IGP area, inter IGP area, inter-AS and
inter-provider TE LSPs path
computation for Point-to-Point,
Point-to-Multipoint and
Multipoint-to-Multipoint TE LSPs.
- Definition
of protocol-independent metrics and constraints defining path
quality
measurement criteria, algorithm complexity and scalability criteria
related to path computation techniques.
- Definition of requirements
for communication between LSRs and PCEs
including routing extensions in
support of PCE discovery techniques within
an IGP area and across multiple
IGP areas, ASes and Provider networks, and
including the development of
new protocols or protocol extensions for
requesting path computation and
supplying responses. Any protocol
extensions will developed in conjunction
with the working groups in charge
of the specific protocols.
-
Specification of routing (OSPF, ISIS, BGP) and signalling extensions
(RSVP-TE) required by PCE-based path computation techniques. The
extensions
will developed in conjunction with the working groups in charge
of the
specific protocols.
- Specification of requirements and
protocol extensions related to the
policy, security and confidentiality
aspects of PCE-based path computation
techniques involving PCEs of
multiple Providers.
- Definition of MIBs, management procedures related to
the protocol
extensions defined by the WG
In doing this work, the WG
will closely work with at least the following
other WGs: CCAMP, MPLS,
ISIS, OSPF, IDR. The WG will also cooperate with
the ITU-T and OIF.
Goals and Milestones
Dates for milestones to be decided later.
- Post strawman WG goals and charter.
- Submit WG document defining
the framework and applicability of the
PCE model.
- Select a single
candidate protocol from communication between LSRs
and PCEs.
- Submit
document(s) that define various path computation models
- Submit an
analysis document examining the requirements for coherent
computation
techniques and the implication of cooperation between
PCEs.
- Submit a
document defining the protocol for communication between
LSRs and PCEs.
- Submit document(s) defining extensions to routing and signalling
protocols necessary to support the use of a PCE model within MPLS
networks.
- Submit a document defining MIB modules for modeling and
management
of PCE systems.
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