Update on CEF Networks in Slovakia

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Update on CEF Networks in Slovakia

• Pavol Horváth, Marian Durkovic, Tibor Weis

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SANET2 Network

• Fully based on dark fibre
• Ethernet everywhere (LAN, MAN, WAN)
• significant reduction of network complexity
• much lower cost than routers with POS interfaces
• easy and unified management
• First part in production since Feb. 2002

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Progress since CEF2005

• Gigabit ethernet trunks running out of capacity
• especially on cross-border links
• But big DWDM solution unnecessary and too
  expensive for SANETs needs
• One 10-gigabit ethernet fully sufficient
• links are 802.1Q trunks - native support for L2
  services
• Keep the possibility to install second lambda

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International Connectivity

• Cross-border fibre to AT, CZ
• IRU-like contracts for 10 years
• maintenance provided by DF owner
• CBF to PL, HU and UA planned
• Peerings 10 GE connection to SIX, VIX and NIX
• Commodity IP transit (Sprint, GTS)
• Connection to GEANT

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CBF Bratislava - Wien

• Gigabit ethernet in production since Aug. 2002
• 108 km of G.652 fibre - chromatic dispersion too
  high for todays ZR XENPAKs
• Changed the intercity part for G.655 fibre
• 6 km of G.652 90 km of G.655 12 km of G.652
• Connection from G.652 to G.655 had to be spliced
• 10-gigabit ethernet in production since 26.1.2006
• NIL solution, no amplifier nor DCM needed

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CBF Bratislava - Brno

• 200 km of G.652 fibre
• Gigabit ethernet in production since Apr. 2003
• L2 switch used as signal repeater
• not optimal if several lambdas need to be
  installed
• CESNET developed and deployed NIL solution with
  CzechLight amplifiers providing 4 lambdas
• 10-gigabit ethernet in production since 14.2.2006

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External Traffic
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National Backbone

• 1770 km of dark fibre
• 2 providers Orange, Slovak Railways
• IRU-like contracts
• for 10 years
• Maintenance provided by DF owner

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Metropolitan Networks

• Originally in 8 regional centres
• Now also in other towns
• Ducts cables owned by SANET
• upto 144 fibre strands per cable
• maintenance outsourced to specialized company
• Coordinated activities with other investors
• significantly lower trenching costs
• Cooperation with local governments

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Metropolitan Networks (2)

• Some municipalities are members of SANET
• Their dark fibre infrastructure is available to
  other members free of charge
• schools, hospitals, museums, libraries
• SANET provides technical support and know-how

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Backbone Equipment

• 16 x Catalyst 6509
• 4 x 10 GE, 48 x GE, 48 x FE ports
• 10 x Catalyst 3750/3550
• 2 x GE, 24 x FE ports
• Long reach optical transceivers
• approx. 70 pieces in total

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Optical Monitoring

• Recent transceivers have the ability to report
• real-time operating parameters
• laser temperature/current, RX/TX optical power
• Ultimate requirement for CEF networks
• Good support on DWDM/SDH equipment
• But support on ethernet switches or routers is
  sometimes buggy or non-existent
• Need to push vendors to implement it
• Compulsory on all new equipment purchases

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Optical Monitoring (2)

• CVT-Bratislava show interfaces transceiver
• Optical
  Optical
• Temperature Voltage Current Tx Power
  Rx Power
• Port (Celsius) (Volts) (mA) (dBm)
  (dBm)
• ------- ----------- ------- -------- --------
  --------
• Te1/1 34.6 0.00 33.6 -1.5
  -4.6
• Te1/2 32.0 0.00 8.8 -2.5
  -2.9
• Te1/4 34.0 0.00 101.6 1.2
  -21.9
• Te2/1 33.1 0.00 30.5 -1.1
  -5.0
• Te2/2 36.7 0.00 101.2 1.1
  -14.6
• Te2/4 34.4 0.00 102.7 0.7
  -13.6
• Gi3/3 45.9 3.30 34.6 2.9
  -20.2
• Gi4/12 40.7 3.30 36.1 2.8
  -20.8
• Gi5/1 35.6 3.32 5.1 -4.5
  -5.8
• Gi5/2 35.1 3.32 14.4 -5.0
  -15.1

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Research Future Plans

• Advanced layer-2 for ethernet networks
• spanning-tree protocol blocks all redundant links
• leads to inefficient use of resources and
  suboptimal packet flows
• two activities to address these problems
• IEEEs 802.1aq shortest path bridging
• IETFs TRILL (based on routing bridge proposal)

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Research Future Plans (2)

• 100-gigabit ethernet development
• native next step for SANET without the need for
  additional technology
• no change in overall network concept
• with advanced modulation and 4 lambdas _at_ 12.5G
  reach over dark fibre might be similar to 10 GE
• if ready in 2010, it will match SANETs upgrade
  cycle

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• Time for your questions