ABSTRACT:
Several existing and proposed network architectures are discussed.
The two-layer model, which aims at a tighter integration between IP
and optical layers, offers a series of important advantages over the
current multi-layer architecture. The benefits include more
flexibility in handling higher capacity networks, better network
scalability, more efficient operations and better traffic
engineering.
Multiprotocol Label Switching (MPLS) has been proposed as the
integrating structure between IP and optical layers. Routing in the
non-optical and optical parts of the hybrid IP network needs to be
coordinated. Several models have been proposed including overlay,
augmented, and peer-to-peer models. These models and the required
enhancements to IP routing protocols, such as, OSPF and IS-IS are
provided.
Control in the IP over Optical networks is facilitated by MPLS
control plane. Each node consists of an integrated IP router and
optical layer crossconnect (OLXC). The interaction between the
router and OLXC layers is defined. Signaling among various nodes is
achieved using CR-LDP and RSVP protocols.
The management functionality in optical networks is still being
developed. The issues of link initialization and performance
monitoring are summarized in this document.
With the introduction of IP in telecommunications networks, there is
tremendous focus on reliability and availability of the new IP-
optical hybrid infrastructures. Automated establishment and
restoration of end to end paths in such networks require
standardized signaling and routing mechanisms. Layering models that
facilitate fault restoration are discussed. A better integration
between IP and optical will provide opportunities to implement a
better fault restoration.
This draft presents a summary of issues related to transmission of
IP packets over optical networks. This is a compilation of many
drafts presented so far in IETF. The goal is to create a common
document, which by including all the views and proposals will serve
as a better reference point for further discussion. The novelty of
this draft is that we try to cover all the main areas of integration
and deployment of IP and optical networks including architecture,
routing, signaling, management, and survivability.
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Note: This is a revised version (version 01) of that submitted to IETF (version 00). Most revisions are minor/editoral.