Logical topology design for IP rerouting: ASONs versus static OTNs |
| |
Authors: | Adelbert Groebbens Didier Colle Sophie De Maesschalck Bart Puype Kris Steenhaut Mario Pickavet Ann Nowé Piet Demeester |
| |
Affiliation: | (1) AT&T Labs, 200 S. Laurel Ave, Middletown, NJ 07748, USA |
| |
Abstract: | IP-based backbone networks are gradually moving to a network model consisting of high-speed routers that are flexibly interconnected
by a mesh of light paths set up by an optical transport network that consists of wavelength division multiplexing (WDM) links
and optical cross-connects. In such a model, the generalized MPLS protocol suite could provide the IP centric control plane
component that will be used to deliver rapid and dynamic circuit provisioning of end-to-end optical light paths between the
routers. This is called an automatic switched optical (transport) network (ASON). An ASON enables reconfiguration of the logical
IP topology by setting up and tearing down light paths. This allows to up- or downgrade link capacities during a router failure
to the capacities needed by the new routing of the affected traffic. Such survivability against (single) IP router failures
is cost-effective, as capacity to the IP layer can be provided flexibly when necessary. We present and investigate a logical
topology optimization problem that minimizes the total amount or cost of the needed resources (interfaces, wavelengths, WDM
line-systems, amplifiers, etc.) in both the IP and the optical layer. A novel optimization aspect in this problem is the possibility,
as a result of the ASON, to reuse the physical resources (like interface cards and WDM line-systems) over the different network
states (the failure-free and all the router failure scenarios). We devised a simple optimization strategy to investigate the
cost of the ASON approach and compare it with other schemes that survive single router failures. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|