Abilene resiliency test
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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

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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


Ominous

Ominous?


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


Abilene resiliency test

Primary & Backup BB Paths


Abilene resiliency test

MPLS Path Structure


Mpls paths

MPLS Paths


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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