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  • SWITCH 2012

    Strategy for SWITCH's next generation optical networkTerena Network Architecture Workshop 2012

    Felix Kugler, Willi Huber

    felix.kugler@switch.chwilli.huber@switch.ch

    21.11.2012

  • SWITCH 2012

    Introduction !The project for the SWITCHlan renewal was formally accepted on November 15, 2012.

    no detailed concept is available yet we present our vision, goals, and the

    rough concepts

    2

  • SWITCH 2012

    Agenda!

    where we are today where we want to go how to get there

    fibers and optical transmissionswitching layer

    summary

    3

  • SWITCH 2012

    11 years since first light 2500 km of fiber pairs ~60 PoPs

    SWITCHlan mid 2012!

    6

    high quality, high performance, low latency IP backbone multiple upstreams to commercial Internet @ 2 large

    exchange points exclusive GEANT access

    hotspots: areas with largest bandwidth needs

    regional links 1Gbps few with 10Gbps

    core backbone DWDM 10..16 lambdas max 10Gbps/lambda

  • SWITCH 2012

    SWITCHlan is doing fine!! IP service

    0.1..20 Gbps access speeds

    OPN (optical private network) EoMPLS based P2P and multipoint links (0.1..10Gbps) resilient no bandwidth guarantee (but overprovisioning and careful monitoring)

    lambda services unprotected only so far exclusively used for LHCOPN CBF links sub-standard availability !

    7

    CNAF - KIT

    CNAF - CERNCNAF - FERMILAB

    our No.1 service!

  • SWITCH 2012

    Why fix what aint broken ?!

    SWITCHlans DWDM gear is getting old some components face their end of life number of free lambdas decreasing rapidely investments no longer pay out no development to 40G/100G inflexible operations

    8

    though less than 50% of lambdas are in use today!

  • SWITCH 2012

    Technology has gone a long way !

    9

    optical switching (ROADMs)

    2005

    2012

    size

    sophisticated modulation schemes

    tunable optics

    Let us make best use of it!

  • SWITCH 2012

    Agenda!

    where we are today where we want to go how to get there

    fibers and optical transmissionswitching layer

    summary

    10

  • SWITCH 2012

    What we anticipate! new users to be connected, mostly small ones continued average traffic growth of 40%, and sudden high bandwidth demands triggered by outplacement

    of storage & computing only few users will need full 100G any time soon 10G will prevail for the next years new trend: sensor sites at far away locations

    bandwidths needs exceeding GPRS, ADSL range but very limited budget often not permanent

    11

  • SWITCH 2012

    Long Term Development Strategy

    optical layer forced upgrade all our DWDM infrastructure

    within 3 years (amplifiers, ROADMs, filters etc) a long term investment (for a 10 years life) additional channels and new functionalities

    deployed when needed select a vendor with

    a clearly defined, realistic road-map willingness for a continuing, close collaboration

    13

  • SWITCH 2012

    Long Term Development Strategy

    network layer evolutionary approach continue to use existing (10G capable) routers new 100G capable router will be deployed as

    needed shorter renewal cycle compared to the optical

    equipment

    14

  • SWITCH 2012

    Four things we want to improve! bandwidth reserves

    more lambdas 100Gbps capability

    flexibility transparent lambdas between all core nodes rapid channel setup auto-calibration of power levels

    stability topology improvements to enhance resilience optical switching capability at major junctions

    coverage enlarge fiber footprint extend core backbone over whole country

    15

  • SWITCH 2012

    Agenda!

    where we are today where we want to go how to get there

    fibers and optical transmissionswitching layer

    summary

    16

  • SWITCH 2012

    Overall network stability! based on 10 years experience we postulate

    three independent paths into hotspots Zrich, Geneva, Lugano

    two-way resilience on the core backbone single fiber paths sufficient within city limits

    stability of electric power worse than availability of fibers crucial: keep connectivity up even if a whole region goes black

    for a long time run two powerful exit points to the Internet build bypasses around major network hubs

    17

  • SWITCH 2012

    Proposed fiber footprint 2015 !

    19

    moderate expansionof fiber footprint

  • SWITCH 2012

    Optical transport 2001..2012 !

    20

    Sorrento DWDM2001..200316 lambdas

    BTI DWDM2005..201010 lambdas

    CWDMrouter plugins +passive optics1..4 lambdas

  • SWITCH 2012

    The new optical core! equal capabilities for all regions uniform transmission gear to be built on existing fibers, while services remain up connects all cross border links to neighbor NRENs

    21

    GARR

    Renater

    DFNBelW

    extend corebackbone

  • SWITCH 2012

    Photonic core backbone design!

    most nodes add/drop few lambdas only express lambdas between network hotspots prevail

    minimizing OEO conversions seems reasonable thus we favor photonic ROADMs

    no bundling or sub-lambda switching on optical layer23

    typical span 60..100km

    large university orcomputing center

    large university orcomputing center

    smaller university

    max ring length 1000km

    transponders

    core nodes

    numerous express lambdasbetween network hotspotsnetwork hotspot

  • SWITCH 2012

    Key requirements! 40 lambdas, easily upgradable to 80 native 10G and 100G wavelengths 1000km reach without regeneration auto-calibration of optical power levels support for alien waves tolerance for optical signals outside C-band smooth path toward super-channels for

    400G compatibility appreciated

    24

  • SWITCH 2012

    Optical switching ! optical switching capability mandatory initial deployment of multi-degree ROADMs

    at selected major fiber junctions at entry points of native lambda services

    long-term plans remain to be defined use of direction-, color-, contention-less ROADMswhere and when ? functionality versus reliability ? economics, size, complexity ?

    25

  • SWITCH 2012

    About economics! equipment, connectivity

    dramatic increase in performance & functionality per $$

    maintenancecost approx. stable

    fiber leases (CH) 45% of overall network cost last 10 years: ~30% decrease in lease cost/mwont go significantly down any more

    26

    find ways to mitigate!

  • SWITCH 2012

    Fiber sharing with Hybrid WDM!

    27

    core backbone 40..80 DWDM channels OSC spans up to 100km unrepeatered links up to

    1000km

    1503..1577 [nm]1470 1490 1590 1610

    regional links 4 CWDM channels links up to 60km

    L-Band range, suitable for amplified long range links

    for use by SWITCH to connect small sites by regional networks

    Use existing backbone fibers to connect small sites!

  • SWITCH 2012

    Fiber sharing with Hybrid WDM!

    possible for a few dB more span loss micro-housing at regional junctions: cheap, small, passive

    28

    DWDM node

    DWDM node

    core sitecore site

    (routerless)

    small site

    HW

    DM

    split

    ter

    HW

    DM

    split

    ter

    HW

    DM

    split

    ter

    HW

    DM

    split

    ter

    micro-housing

  • SWITCH 2012

    Agenda!

    where we are today where we want to go how to get there

    fibers and optical transmissionswitching layer

    summary

    29

  • SWITCH 2012

    IP Layer Design Goals network services

    99.99% availability overprovisioning -> virtually no packet loss lowest possible transfer delays IP service & private layer 2 networks

    network infrastructure meshed network two exit points at the extreme (Geneva & Zurich) PoPs at customer premises

    border of responsibility: Ethernet interface footprint & power is an issue

    must scale to small and big sites (1 : 100)

    30

  • SWITCH 2012

    Routing vs. Switching shortest (physical) path first:

    IP routers shortest path bridging (TRILL, IEEE 802.1aq)

    test with TRILL (Brocade switches): missing network management tools lacking interoperability among vendors difficult to provide layer 2 services doesnt scale for a national network

    routed IP backbone robust, proven and well scalable solution small organizations connected with stub links (without router)

    31

  • SWITCH 2012

    Layer 1 & 2 Services emulated layer 2 services

    benefit from meshed backbone topologyEoMPLS point-to-point links, VPLS multipoint

    networks

    lambdasonly for higher bandwidths, 10G and 100Gprotection will be available

    32

  • SWITCH 2012

    MPLS in the Backbone layer 2 services forced us to deploy MPLS in

    the backbone the only available tunneling technology, that was

    implemented in hardware used for a restricted address range for layer 2

    services only

    desirable solution: tunneling technique using encapsulation in IP no need for additional protocols in the backbone a use case for SDN?

    33

  • SWITCH 2012

    Agenda!

    where we are today where we want to go how to get there

    fibers and optical transmissionswitching layer

    summary

    34

  • SWITCH 2012

    Summary fiber footprint

    modest expansion

    t

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