[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
CCAMP draft-venkatachalam-ospf-traffic-01.txt
-----------------------------------------------------------------------
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.