Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). To address
the integration of [IP/MPLS (multiprotocol label-switching)] packet and (optical)
transport networks, the Optical Internetworking Forum (OIF) has defined a
user-to-network interface (UNI) for overlay networks: the OIF UNI version 1.0, also
referred to as the Public UNI. However, since its implementation agreement
specification, it has become clear that this UNI--based on OIF-specific extensions
to the generalized MPLS (GMPLS) protocols--will not be able to meet the future
requirements of some operational environments. Hence a flexible, extensible, and
fully GMPLS-compliant UNI is being defined at the Internet Engineering Task Force
(IETF): the Private UNI (aka GMPLS for overlay networks). The Private UNI enhances
the interaction between the packet and transport network control planes of a
multilayer network architecture. This interface is particularly suitable for a
control-plane interconnection model in which the equipment belongs to a common
administrative entity (i.e., a single carrier environment). Signaling sessions
through the Private UNI are used to invoke two main services that require
constructive coordination between the network layers: provisioning and network
recovery. Here we present the Private UNI specific GMPLS resource reservation
protocol-traffic engineering (RSVP-TE) extensions in support of these services in
IP/MPLS over SONET/SDH (synchronous optical network/synchronous digital hierarchy)
GMPLS multilayer networks and illustrate how Private UNI signaling enhances
coordination in multilayer network recovery.
© 2003 Optical Society of America
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