A Transition Path to Gigabit Ethernet over WDM in Support of Emerging e-Business Applications - PDF by smilanovic


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									     A Transition Path to Gigabit Ethernet over WDM in Support of
                   Emerging e-Business Applications
                        STANISLAV MILANOVIC *, NIKOS E. MASTORAKIS #
                      WSEAS, Highest Institute of Education, Science and Technology
                                        Haghiou I. Theologou 17
                                          15773, Zographou,
                                           Athens, GREECE
                      Stanislav.Milanovic@wseas.org     http://www.wseas.org/hiest
                                  HELLENIC NAVAL ACADEMY
                            Terma Hatzikyriakou, 18539, Piraeus, GREECE.
                          mastor@ieee.org      http://www.hna.gr/index-hna.htm

Abstract: - This paper deals with a real-world Gigabit Ethernet over WDM migration at a corporate
headquarter of a well known international organisation. A prominent communications provider needed to
upgrade its enterprise network in order to ensure reliable infrastructure support to the emerging e-business

Key-Words: - Gigabit Ethernet Technology, WDM, e-Business, Internet/Intranet

1 Introduction                                          them, traditional local area network (LAN)
                                                        infrastructures must be upgraded to higher-
The Internet Revolution is changing how we do           performing switched topologies.
business. Recent advances in mission-critical web
applications (enterprise resource planning, e-          Traditional wide area networks (WAN) may also
commerce, Voice-over-IP, server co-location and         need to be upgraded to higher-speed services
private Intranets), together with the wide-spread use   (xDSL, cable modems, ATM, Frame Relay, ISDN)
of the public Internet, are encouraging the             to ensure robust application performance over
development of new business and consumer                WAN and remote access connections [1-6]. What's
relationships. A growing number of e-business           more, Quality of Service (QoS) is a necessity when
applications are helping plan and manage resources,     mission-critical e-business application traffic is
distribute information, provide customer services,      moving across the network.
and enable electronic commerce. Information is
available from multiple sources, network traffic is     The long-term implication is that users will
unpredictable and performance demands are great.        increasingly demand solutions for gigabit
Change is rapid and constant. And the emergence         networking whose specific requirements include
of newer applications will keep the momentum of         tens if not hundreds of gigabits per second of total
change moving.                                          network capacity, any-to-any communication,
                                                        smooth migration of scalable performance that can
Twenty-first century businesses require intelligent     be incrementally implemented anywhere in the
and economical networks to gather, publish, share       network, and strong compatibility with the
and modify information. At the base of any              infrastructure of existing enterprise networks.
successful e-business application is a highly
sophisticated,     high-performance       network.      The New Internet Economy is profoundly
Corporate network can become the most strategic         transforming all private enterprises and public
asset and the most powerful competitive advantage       institutions. The question is no longer if or when it
in the marketplace. E-business packages generally       will impact an organization, but rather how to
assume a highly scalable and available Internet         execute the transformation.
Protocol (IP) network infrastructure. To support
2. Gigabit           Ethernet         Technology          to mix data and video over Ethernet through a
                                                          combination of the following:
Overview                                                  • Increased bandwidth provided by Fast Ethernet
                                                             and Gigabit Ethernet, enhanced by LAN
Gigabit Ethernet provides 1Gb/s throughput (2Gb/s
full-duplex) for campus networks with the
simplicity of Ethernet at lower cost than other           • The emergence of new protocols, such as
technologies of comparable speed. All three                  Resource Reservation Protocol (RSVP), that
Ethernet speeds use the same IEEE 802.3 frame                provide bandwidth reservation.
format, full-duplex operation and IEEE 802.3x flow        • The emergence of new standards such as
control methods [7]. In half-duplex mode, Gigabit            802.1Q and 802.1p which will provide virtual
Ethernet employs the same fundamental Carrier                LAN (VLAN) and explicit priority information
Sense Multiple Access with Collision Detection               for packets in the network,
(CSMA/CD) protocol to resolve contention for the          • The widespread use of advanced video
shared media.                                                compression such as MPEG-2.

The emergence of Intranet applications portends a         These technologies and protocols combine to make
migration to new data types, including video, voice       Gigabit Ethernet an extremely attractive solution
and 3-D visualizations of complex images. In the          for the delivery of video and multimedia traffic, as
past it was thought that video might require a            illustrated in Figure 1.
different    networking     technology      designed
specifically for multimedia. But today it is possible

                                  Figure 1. High-Speed Network Capabilities

Gigabit Ethernet, like all Ethernet specifications,       communicate the priority          of    packets   to
specifies the data link (layer 2) of the OSI protocol     internetworking devices.
model [8]. Gigabit Ethernet provides high-speed
connectivity, but does not by itself provide a full set   RSVP support can be achieved by mapping RSVP
of services such as Quality of Service (QoS),             sessions into 802.1p service classes. The Resource
automatic redundant fail-over or higher-level             Reservation Protocol (RSVP) is a network-control
routing services; these are added via other open          protocol that enables Internet applications to obtain
standards.                                                special qualities of service (QoSs) for their data
                                                          flows. RSVP is not a routing protocol; instead, it
802.1p and 802.1Q (Layer 2 functions) facilitate          works in conjunction with routing p
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