nanog mailing list archives
Re: Selfish routing
From: "Stephen Sprunk" <stephen () sprunk org>
Date: Sat, 26 Apr 2003 16:22:58 -0500
Thus spake <alex () yuriev com>
Ah, but there are times when suboptimal paths have spare capacity but you are dropping packets on the optimal path(s) due to congestion. An "unselfish" routing model would allow you to use _all_ available capacity in the network before packets get dropped.Make optimal path have more capacity.
If your lead time for ordering circuits is <1 day and your cost for excess bandwidth is zero, that's certainly a viable strategy. Most of us, even facilities-based carriers, don't live in that dreamland.
No need for FastPath(tm) or any other market hype. Case closed.
Please distinguish between startups desperately marketing OSPF under a trademark, and tier 1 carriers who use _significantly different_ routing strategies and won't even acknowledge it without an NDA.
"My outbound is your inbound" "I always can control my outbound" "Therefore, you cannot control your inbound" "Therefore, your claims of 'traffic management' is marketing hype"
A carrier can't exercise fine-grained control over what traffic levels their peers/customers/upstreams send them, but it is possible to react in real-time to varying traffic levels and prevent congestion (within your own network) from flash crowds, link outages, peer flaps, etc. Capcity, even in our current bandwidth glut, is expensive. If you can maintain the same performance level with less capacity, you keep more profits at the end of the day -- and that's the real goal, not design purity. S Stephen Sprunk "God does not play dice." --Albert Einstein CCIE #3723 "God is an inveterate gambler, and He throws the K5SSS dice at every possible opportunity." --Stephen Hawking
Current thread:
- RE: Selfish routing, (continued)
- RE: Selfish routing jeffrey.arnold (Apr 23)
- Re: Selfish routing Mike Lloyd (Apr 25)
- Re: Selfish routing alex (Apr 25)
- Re: Selfish routing Petri Helenius (Apr 25)
- Re: Selfish routing Stephen J. Wilcox (Apr 26)
- Re: Selfish routing alex (Apr 26)
- Re: Selfish routing Mike Lloyd (Apr 26)
- Re: Selfish routing alex (Apr 27)
- Re: Selfish routing Stephen Sprunk (Apr 25)
- Re: Selfish routing alex (Apr 25)
- Re: Selfish routing Stephen Sprunk (Apr 26)
- Re: Selfish routing alex (Apr 27)
- Re: Selfish routing Scott Granados (Apr 27)
- Re: Selfish routing Richard A Steenbergen (Apr 25)
- Re: Selfish routing alex (Apr 25)
- Re: Selfish routing Richard A Steenbergen (Apr 25)
- Re: Selfish routing Barney Wolff (Apr 26)
- Re: Selfish routing Mike Lloyd (Apr 26)