[ppml] Effects of explosive routing table growth on ISP behavior

Scott Leibrand sleibrand at internap.com
Tue Oct 30 12:43:59 EDT 2007

Ted Mittelstaedt wrote:
> It's unlikely that if the routing
> table grows past existing ISP equipment that it would result in
> ISP bankruptcies.  A far more likely scenario among the smaller
> cash-poor ISP's is it will encourage single homing with the resultant
> lowering of Internet reliability for customers of those ISPs.

Even that is a bit of a false binary dichotomy.  Small ISPs have several 
options in addition to multihoming with full BGP routes or singly 
homing.  They can multihome with default only, announcing their route(s) 
to the world, but doing their outbound TE by some method other than 
BGP.  They could accept partial routes plus default, giving them a lot 
of the benefit of outbound BGP route selection without having to take a 
full table.  Or, they could actively filter deaggregates, maintaining 
full BGP reachability without having to keep up with their competitors' 
upgrade cycles.


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