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Abilene Resiliency Test. John Moore Technical Director Centaur Lab North Carolina ITEC [email protected] SDSC Kevin Walsh Tom Hutton Abilene NOC Andrew Lee Matt Davy CENIC Erick Sizelove. Spirent Communications Qwest Internet2 Jeff Boote Chris Heermann. Acknowledgements.

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abilene resiliency test

Abilene Resiliency Test

John Moore

Technical Director

Centaur Lab

North Carolina ITEC

[email protected]

acknowledgements
SDSC

Kevin Walsh

Tom Hutton

Abilene NOC

Andrew Lee

Matt Davy

CENIC

Erick Sizelove

Spirent Communications

Qwest

Internet2

Jeff Boote

Chris Heermann

Acknowledgements
motivations
Motivations
  • OC-192 backbone links from Qwest “unprotected”
    • Previous OC-48 backbone circuits had SONET protection (sub- 50 ms)
  • Ongoing MPLS investigation requires understanding of various protection options available
test objectives
Test Objectives
  • Measure convergence time after a link outage
    • End-to-end and backbone edge-to-edge
    • Use longest convenient path
      • SDSC to NCSU
  • Examine effect of modifying IGP settings
    • Chose spf delay value as variable
  • Examine different MPLS recovery schemes
    • Soft LSP (loose hop)
    • Explicit route (strict hops)
    • Fast re-route
test traffic
Test Traffic
  • Spirent Communications AX/4000 tester in CA-ITEC and NC-ITEC Labs
    • One IPv4 stream
    • Five MPLS streams
    • Unidirectional
  • AMI owamp streams between LOSA and WASH
    • Actually, we have data for any-any Abilene nodes
  • IS-IS monitor tool
    • Not deployed in time
test traffic1
Test Traffic
  • Owamp traffic
    • 64 bytes, 10 pps
      • Increased rate for test, will leave as new default
    • Measure latency and packet loss (indirectly)
  • AX/4000 traffic
    • 1000 bytes frames, 20 Mbps per stream
    • MPLS tunnel traffic was Ethernet
      • Used Juniper L2 circuits to get vlan-tagged traffic into LSP
    • Measure packet rate and packet loss
is is parameters
IS-IS Parameters
  • Link failure hold time
    • Delay in declaring link down
    • Default: zero
  • LSP interval
    • Rate limit for LSP flooding (per interface)
    • Default: 30 LSPs per second
  • SPF delay
    • Delay in running spf algorithm
    • Default: 200 ms
  • SPF recalculation time
    • Time required to run spf algorithm
    • Abilene: usually < 1 ms, some spikes to 2 ms
observations so far
Observations (so far…)
  • Decreasing spf delay seems to make convergence time worse
  • MPLS FRR offers a possible alternative way to minimize convergence time
  • More analysis needed
  • More testing needed
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