Extreme congestion (was Re: inter-domain link recovery)

Fred Baker fred at cisco.com
Wed Aug 15 15:47:42 UTC 2007


On Aug 15, 2007, at 8:35 AM, Sean Donelan wrote:

> Or should IP backbones have methods to predictably control which IP  
> applications receive the remaining IP bandwidth?  Similar to the  
> telephone network special information tone -- All Circuits are  
> Busy.  Maybe we've found a new use for ICMP Source Quench.

Source Quench wouldn't be my favored solution here. What I might  
suggest is taking TCP SYN and SCTP INIT (or new sessions if they are  
encrypted or UDP) and put them into a lower priority/rate queue.  
Delaying the start of new work would have a pretty strong effect on  
the congestive collapse of the existing work, I should think.



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