Transcript 20020507-e2e-Lord

Route Optimization
Abilene Route Quality Control Initiative
Aaron D. Britt [email protected]
Guy Almes [email protected]
June 11, 2002
Problem Statement(s)
•How does Internet2 continue to add to its
initiative of “Superlative Networking” ?
•Does the Abilene backbone outperform the
Commodity Internet?
•What problems are there, if any, regarding
the routing over the Abilene Backbone?
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Internet2 Route Optimization Objective
•Increase the Performance of the Internet2
Infrastructure
•Use Route Optimization Technology to gather
Performance Metrics for the Internet2 Network
•Use the captured data to Identify Problem Areas
and report overall how the Abilene Network is
Performing
•Identify Solutions for any problems discovered
•Implement a given subset of these solutions, if
they make sense.
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What is BGP Route Optimization?
•Definition: Continually (or periodically)
determining the performance of various links
(routes), measured through the use of active
probes, and weighting those measurements
based on tunable metrics and weights.
•Simply put, using additional intelligence to
measure and define the performance of a
route, above and beyond that of the standard
BGP metrics.
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Capture Performance Metrics
•What Metrics are Important?
•Latency - The time it takes to get information
through a network. Measured for the round trip.
•Packet Loss - Packet loss reflects the amount of
packets sent through a given network that when
sent from a host never reach the intended
destination.
•Unreliability – How reliable the route is or is not
based on a sub-set of metrics.
•Route Asymmetry
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Metrics Gathered and Calculated
• OpScore
• Algorithm based on the probe data weighted,
normalized and calculated based on customer
defined settings (Min/Max/Weight).
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Latency
Unreliability
Congestion Points
Layer 3 Hops
Carrier Preference (Least Cost Routing)
• The route with the lowest score wins!
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How to gather these Metrics
•High Level Architecture
•Orbit1000-CPE
•Orbit1000-Stats
•Private AS Space eBGP Multihop
Commodity
Internet
AS 64701
AS 64701
PROBES
Abilene Router
Orbit1000 CPE
Internet2
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Type of Probe
•UDP Based
•ICMP - Routers drop ICMP
•TCP – Sets off IDS systems
•UDP probe, though proprietary in nature, very
similar to that of a typical traceroute.
•UDP Probe data is within 2% of the accuracy of
TCP probe data, but it doesn’t set off IDS
systems.
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Probing Mechanism
•Where should we send the probes?
• Prefix list we receive from the Internet2 edge router
• ’Prefix + 1’ methodology, unless a more specific IP address is
specified in the discovery-include list
• Using a bisecting search algorithm that finds the endpoint
while minimizing traffic.
– Based on ICMP response (did we get there or not)
– When the probe reaches an endpoint, or it runs out of TTL’s, we
blast out any missing/remaining TTL’s
•Using the Source Port and Destination Port we
can track the probes, where they went and why.
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Where does all the Data Go?
•Probe Data is stored and collected in a
central CORE – SQL dB.
•All Probing Devices store their data in the
same CORE
PROBE DATA
PROBE DATA
orb01.i2.annarbor
orb01.i2.armonk
CORE
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The CORE
•Responsible for:
• Data Collection & Storage
• OpScore Calculation
CORE
View
Optimizer
Balancer
SQL
dB
Reporting
Engine
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Reporting Engine
•Web Interface
•Graphical and Analytical
•Summary Statistics
•Can drill down to the
packet of each probe sent
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Identify Problem Areas
•Identify Problem Areas
•Throughput and Latency Issues
– Jitter
– Packet Loss
– Congestion Points
•Routing Issues (Misconfigured?)
– Asymmetry
– Routing Loops
– Black Holes?
•What else will we find?
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Project Scope
• Install probe devices – 1 GigaPOP at a time
• Probe Internet2 prefixes over both Internet2
and commodity internet
• Collect data
• Tweak metrics
• Report on published results
• Define recommended changes based on
analysis of data.
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Project Timeline
•Armonk site installed – 1st week of April
•Merit GigaPOP – 1st week of May
•Determine on ICB, which POPs to move
forward through summer months
•Start to review data July through August
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Internet2 and Opnix Collaboration
Abstract:
With the advancement of powerful applications on the
Internet, the improvement of Internet performance to enable
these applications can be a difficult challenge. Opnix, Inc.
has developed route control and performance enhancing
tools to help address these challenges in ways not done
previously. Internet2, the well-known next generation
network, will work closely with Opnix to exploit these tools
and technology. Internet2 and Opnix will work in the
Internet2 environment to monitor and improve the
technology’s based on what we learn together. Sharing the
results with the Internet2 community to further the
advancement of next generation applications will be the goal.
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Internet2 and Opnix Endgame
•Establish baselines of performance for Internet2.
•Verify the Internet2 network should be preferred over
commodity Internet for Research/Education
destinations.
•Illuminate performance inhibiting issues from
network to continue with leading edge performance.
•Develop next generation applications for detection of
performance inhibiting issues.
•Support Internet2 engineers with the use of next
generation Route Control technology.
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