Www.intel.com/research The Interdomain Setting of PlanetLab Nodes Suman Banerjee U of Wisconsin,...
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www.intel.com/research The Interdomain The Interdomain Setting of PlanetLab Setting of PlanetLab Nodes Nodes Suman Banerjee U of Wisconsin, Madison Timothy G. Griffin Intel Research, Cambridge UK Marcelo Pias Intel Research, Cambridge UK (extracts from a PAM 2004 presentation) PlanetLab Metting Cambridge UK May 14, 2004
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Transcript of Www.intel.com/research The Interdomain Setting of PlanetLab Nodes Suman Banerjee U of Wisconsin,...
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The Interdomain The Interdomain Setting of PlanetLab Setting of PlanetLab NodesNodesSuman Banerjee U of Wisconsin, MadisonTimothy G. Griffin Intel Research, Cambridge UKMarcelo Pias Intel Research, Cambridge UK
(extracts from a PAM 2004 presentation)
PlanetLab MettingCambridge UKMay 14, 2004
www.intel.com/research
• Intel Research •Global Research and Education Networks (GREN)Global Research and Education Networks (GREN)
Schematic isHighly Simplified!
GREN contains over 1100ASNs
Abilene has70 BGP neighbors,and 650downstream ASNs
www.intel.com/research
• Intel Research •
Traffic between GREN nodes tends to stay on the GRENTraffic between GREN nodes tends to stay on the GREN
www.intel.com/research
• Intel Research •Mapping PlanetLab Hosts and Sites to GREN and Commercial InternetMapping PlanetLab Hosts and Sites to GREN and Commercial Internet
So more than 70% of traffic between PlanetLab hosts is So more than 70% of traffic between PlanetLab hosts is carried on the GREN (0.85 * 0.85 = carried on the GREN (0.85 * 0.85 = 0.7225). 0.7225).
Using 276 productionhosts of Jan. 15, 2004
Notes: These results assume that research to research traffic is carried on GREN,which traceroute experiments seem to verify. Mapping used 20 BGP tablesand associated host IP addresses with best match routes, which give originating ASN.Research ASNs were extracted from Abilene routing table (obtained from Route-Views).
MOAS = multiple origin ASNs
www.intel.com/research
• Intel Research •
GeographyGeography
more about 60% of traffic between more about 60% of traffic between PlanetLab hosts is carried on the PlanetLab hosts is carried on the Abilene/Geant corner of the GREN Abilene/Geant corner of the GREN (0.78 * 0.78 = 0.6084). (0.78 * 0.78 = 0.6084).
LA = Latin AmericaAP = Asia Pacific (including Australia)EMEA = Europe, Middle East, and AfricaNA = North America
www.intel.com/research
• Intel Research •
A “Bad Triangle” …A “Bad Triangle” …
A HP Palo Alto
B Intel Berkeley
CMoscow State U
A
B
C257 ms
201 ms4 ms
www.intel.com/research
• Intel Research •
… and its routing … and its routing
A
B
CRBNet
AT&T
Cable & Wireless
CAIS
Above Net
Telefonica
www.intel.com/research
• Intel Research •
Look at all “triangles”Look at all “triangles”
r = a/(b+c) * (1 + (a – (b + c)))
a = longest side
www.intel.com/research
• Intel Research •
Closer look at violatorsCloser look at violators
www.intel.com/research
• Intel Research •
ObservationsObservations
The majority of PlanetLab nodes currently sit in the GREN The majority of PlanetLab nodes currently sit in the GREN corner of the Internet. In fact, they largely sit in the corner of the Internet. In fact, they largely sit in the Internet2/Dante corner of the GREN.Internet2/Dante corner of the GREN.
This has implications for measurement studies. This has implications for measurement studies. Forwarding paths between PlanetLab nodes are (currently) not as Forwarding paths between PlanetLab nodes are (currently) not as
complex and convoluted as those on the “wide wide Internet”complex and convoluted as those on the “wide wide Internet”
The GREN has a large amount of network diversity that is The GREN has a large amount of network diversity that is currently not experienced by PlanetLab-PlanetLab traffic. currently not experienced by PlanetLab-PlanetLab traffic.
