janet6 what it is and what it isn t
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Janet6: What it is, and what it isnt. Rob Evans Chief Network - PowerPoint PPT Presentation

Jul 21, 2023 •326 likes •465 views

Janet6: What it is, and what it isnt. Rob Evans Chief Network Architect, Janet Janet background Backbone IP service managed by the Janet Network Operations Centre More on the transmission management later Regional networks

  1. Janet6: What it is, and what it isn’t. Rob Evans Chief Network Architect, Janet

  2. Janet background • Backbone – IP service managed by the Janet Network Operations Centre • More on the transmission management later • Regional networks – Most managed autonomously by the regions themselves – Some “public service networks” • Accredited to carry other public sector traffic • Mainly MPLS to segregate Janet traffic and Internet from private networks – Connect to the backbone in two different places • Most sites connect to regional networks – Two management boundaries between Janet and the site • Janet – Regional Network • Regional Network – Site

  3. What we had • SuperJANET5 – Contract signed October 23 rd , 2006. – Transmission system dedicated to us, but managed by Verizon Business • Ciena CoreStream and 4200 • Latterly Nortel/Ciena 6500 for 40G SDH and 100GE on high-PMD fibres – Juniper routers managed in-house • Two routing platforms – T series for IP » No MPLS! – MX for EoMPLS, used for lightpaths – End of contract October 23 rd , 2013.

  4. What we wanted • Light the dark fibre ourselves – Reduce complexity of asking Verizon Business to do something, then Verizon having to ask Ciena to do it • Lots of contractual negotiations for anything ‘new’ – Scale under our control • Lots of high-speed circuits – Currently peaking at about 160Gbit/s of IP traffic from GEANT, peering and transit • Still growing exponentially • Ability to offer consistent set of services – Bring management of regional networks in-house

  5. What we got • 6,500km of dark fibre • Ciena 6500 transmission system – 28 x 100GE circuits – 160(ish) 10G circuits – All coherent • 10G carried over 40G muxponders • No dispersion compensation • 100GE uses SR10 optics – Cheaper optics, but more expensive cabling – Only use within a data centre – Saved ~£1M (~ € 1.2M) across network • Janet manages most regional networks – Not all – Regional network infrastructure not refreshed as part of this, but ongoing project

  6. A picture is worth 1,000 words Fife & Aberdeen Tayside ClydeNET NIRAN Glasgow EaStMAN CANLMAN NNW YHMAN NorMAN Manchester Leeds Telecity KH AQL The TransPennine Arc Birmingham Nottingham Erdington Lowdham Bristol PSBA WMRN EMMAN Bradley Stoke South West London EastERN London London South Telecity Telehouse KPSN Powergate West London London TVN Telecity Telehouse Harbour Ex North Core PoP (Point of Presence) Regional network Transmission site

  7. What we got • Keeping two routing platforms • Juniper T4000 for IP service – Upgrade from T1600 • Sorta – 100GE cost on T4000 is fraction of cost on T1600 – Introducing point-to-point circuits with uncommitted bandwidth • Juniper MX for guaranteed bandwidth circuits – Upgrade interconnects from 10GE to 100GE – Can provision 10GE point to point circuits rapidly

  8. What we didn’t get • OTN Switching – Had considered it for some parts of the network • Bandwidth drop at each point didn’t need to be high • Wasn’t available on many smaller chassis • Added cost – We use the routing platform for building point-to-point circuits • More flexible and dynamic • Transponder-less DWDM system – Router optics not there for long-haul 100G

  9. Here is the second thousand East of Scotland Fife & Aberdeen 2 2 2 Tayside ClydeNET 2 2 NIRAN EaStMAN 1 1 1 Glasgow 1 1 edin sc glas vz PoP belf nl 1 1 1 1 PoP 1 PoP 3 4 CANLMAN NNW YHMAN NorMAN 2 3 2 4 2 2 manc rh leed lu leed lm newc ct 4 1 1 1 1 1 1 PoP PoP PoP PoP TransPennine Arc Manchester Leeds Telecity AQL Kilburn House Global 3 1 Transit HEAnet 1 Public & Private Peers Birmingham Nottingham Erdington Lowdham PSBA WMRN 2 3 3 2 1 1 emPSN Bristol Bradley Stoke South West 2 EMMAN 2 2 2 TVN London 2 6 6 2 London London 4 Telecity Telehouse RAL 4 Powergate West South KPSN EastERN 3 2 2 2 3 2 London London Telecity Telehouse Harbour Ex North GÉANT 100G 2 Global 2 2 2 Transit 2 Public & Private Peers 100Gbps channel Regional network External connectivity Core PoP (Point of Presence) Telehouse fibre Elsewhere N x 10Gbps channels N

  10. Some (technical) challenges • Router power and cooling • Wavelogic 3 Cards, shelf software and management software (OneControl under Linux) from Ciena were all new – Do release dates ever slip? • Odd timing problem on 100Gbit/s OCLD (line-side) cards – Manifested as flapping links – Required a firmware fix • Underwater links to Ireland require lots of amplification – 235km unamplified – Co- and counter-pump Raman amplifiers – Odd blip • Pump amplifiers up to maximum • Clean fibres – No, I mean REALLY clean the fibres – Never, ever, ever unplug this fibre again

  11. Future looks • Where now? • Transmission capacity to scale for some time • Router density is a concern • Space and power for multiple chassis is difficult

  12. Comments? Questions? Janet, Lumen House Library Avenue, Harwell Oxford Didcot, Oxfordshire t: +44 (0) 1235 822200 f: +44 (0) 1235 822399 e: Service@ja.net

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