A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Internet Traffic Engineering Working Group of the IETF.
Title : Network Hierarchy and Multilayer Survivability
Author(s) : W. Lai et al.
Filename : draft-ietf-tewg-restore-hierarchy-01.txt
Pages : 25
Date : 23-Jul-02
This document is the deliverable out of the Network Hierarchy
and Survivability Techniques Design Team established within the
Traffic Engineering Working Group. This team collected and
documented current and near term requirements for survivability
and hierarchy in service provider environments. For clarity,
an expanded set of definitions is included. The team
determined that there appears to be a need to define a small
set of interoperable survivability approaches in packet and
non-packet networks. Suggested approaches include path-based
as well as one that repairs connections in proximity to the
network fault. They operate primarily at a single network
layer. For hierarchy, there did not appear to be a driving
near-term need for work on 'vertical hierarchy,' defined as
communication between network layers such as TDM/optical and
MPLS. In particular, instead of direct exchange of signaling
and routing between vertical layers, some looser form of
coordination and communication, such as the specification of
hold-off timers, is a nearer term need. For 'horizontal
hierarchy' in data networks, there are several pressing needs.
The requirement is to be able to set up many LSPs in a service
provider network with hierarchical IGP. This is necessary to
support layer 2 and layer 3 VPN services that require edge-to-
edge signaling across a core network.
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