House of CardsMonday, April 14. 2008
How open vs. restrictive peering policy affects the AS-Path length
by Fredy Künzler
I got the nice graph below from Oli Hitz, network engineer of senseLAN (AS31736). senseLAN is a regional cable ISP in western Switzerland, and could be classified as a Tier-3 provider. They are peering at SwissIX and are purchasing transit from Level(3) AS3356 and UPC AS6830, and added now a partial feed from Init7 AS13030 (appx. 125k routes).
While Level(3) and UPC both are following a restrictive peering policy (according to the respective entries in the PeeringDB), Init7 peers open. The average AS-Path length went down from 3,18 to 3,13 by adding AS13030. Considering that AS31736 is inbound-heavy, this view may be not too relevant for the actual traffic flow, but it's still a nice statistic (don't we all love statistics?!)
BTW I tried to find a link to UPC's Backbone website ... no luck.
I got the nice graph below from Oli Hitz, network engineer of senseLAN (AS31736). senseLAN is a regional cable ISP in western Switzerland, and could be classified as a Tier-3 provider. They are peering at SwissIX and are purchasing transit from Level(3) AS3356 and UPC AS6830, and added now a partial feed from Init7 AS13030 (appx. 125k routes).
While Level(3) and UPC both are following a restrictive peering policy (according to the respective entries in the PeeringDB), Init7 peers open. The average AS-Path length went down from 3,18 to 3,13 by adding AS13030. Considering that AS31736 is inbound-heavy, this view may be not too relevant for the actual traffic flow, but it's still a nice statistic (don't we all love statistics?!)
BTW I tried to find a link to UPC's Backbone website ... no luck.
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UPC doesn't have a website for their backbone. One good way to contact them is to email peering@aorta.net, emails to that address seem to get escalated up quite a bit inside the company structure, I complained about terrible routing performance inside of UPC's carrier network and once and got an answer from their lead network architect quite quickly.
