CCAMP draft-venkatachalam-ospf-traffic-01.txt

[Senthil Venkatachalam <senthil.venkatachalam@usa.alcatel.com>]

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NAME OF I-D:

http://search.ietf.org/internet-drafts/draft-venkatachalam-ospf-traffic-01.txt

SUMMARY:

This document describes the OSPF "Traffic Engineering Summary LSA"
and its support to enable traffic engineering across area boundaries.
This extension to the OSPF routing protocol is used to support the setup of 
inter-area LSPs. A companion architecture document 
draft-venkatachalam-interarea-mpls-te-01.txt provides the architectural 
requirements for such a concept. 

The TE-summary-LSAs help propagate the traffic engineering metric 
information across areas. The OSPF TE-summary-LSA is defined, along with 
the TE attributes carried in it and their semantics. 

RELATED DOCUMENTS

http://www.ietf.org/internet-drafts/draft-venkatachalam-interarea-mpls-te-01.txt
http://www.ietf.org/internet-drafts/draft-dharanikota-interarea-mpls-te-ext-01.txt
http://www.ietf.org/internet-drafts/draft-ash-ccamp-multi-area-te-reqmts-00.txt

WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK

CCAMP WG - Control C

WHY IS IT TARGETED AT THIS WG.

The setup of Label Switched Paths (LSPs) is a basic component of any MPLS
signalling mechanism. There are no standards that facilitate the setup of 
LSPs across IGP areas. This draft presents extensions to the OSPF
routing protocol and helps support inter-area LSPs, through the use of
OSPF TE-summary-LSAs. 

In addition to other WG tasks, the following WG tasks specifically allows 
this work in the WG:

- Define the relationship between layer 3 routing protocols and the 
  common signalling protocol for establishing and maintaining paths.  

- Define how the properties of network resources gathered by the measurement 
  protocol can be distributed in existing routing protocols, such as OSPF 
  and IS-IS. 

- Develop and define a set of protocol-independent metrics and parameters 
  for describing links and paths that can be carried in protocols. 

JUSTIFICATION

Most work in the CCAMP and indeed many sub-ip groups focuses only 
on the intra-area LSP setup issues. In this draft we propose extensions 
to the OSPF protocol to extend the traffic engineering capability 
across IGP areas. The TE-summary-LSA described in this draft helps propagate 
the TE metric information across areas. The draft describes both
the syntax and semantics of the TE metrics described in the TE-summary-LSA. 

This OSPF extension helps in the measurement of inter-area TE parameters for
LSP setup, one of the central CCAMP features of sub-IP areas such as 
MPLS, IPO and other emerging technology areas to establish switched paths 
across IGP areas, be they LSPs, lightpaths or GMPLS paths.