SWERN Network

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SWERN Network
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SWERN Resilience Proposal
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Disaster Recovery (1)

• Long-term inoperability of Clifton SWERN router,
  UKERNA BAR, WorldCom circuit to BAR
• Medium-term inoperability of Clifton SWERN
  router, UKERNA BAR, WorldCom circuit to BAR

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Disaster Recovery (2)

• Long-term inoperability of PoP
• Long-term unavailability of PoP
• Medium-term inoperability of PoP
• PoP backbone circuit unavailability
• PoP backbone circuit failure
• End site tail telco circuit unavailability
• End site tail circuit failure

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Fault Analysis

• Analysis of 71 faults since August 2002
• 33 client responsibility
• 14 client site equipment
• 31 SWERN responsibility
• 13 site circuit to SWERN PoP
• 8 late-running scheduled maintenance
• 5 hardware faults

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Backup Circuits

• Second route to a client site would protect
  against
• site circuit failure
• SWERN PoP failure
• failure of SWERN backbone circuit to PoP

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Proposed Service
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Broadband Choices

• 44/50 SWERN sites within postcode area of BT ADSL
• Cable also a possibility, and may be faster
  and/or cheaper
• Choice of service
• speed .5, 1, 2Mbps to site
• contention 501, 201

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Traffic Management

• Backup link slower, possibly much slower, than
  production link
• Traffic to and from site should be prioritised to
  reflect needs of the site
• This requires input from site
• Bandwidth Management Advisory Service
• Could also possibly improve service over
  full-utilised production links