RE: hard questions: request routing

["Hilarie Orman" <HORMAN@volera.com>]

How do you quantify "very sure"?  For how long is the guarantee
good?  Suppose the premises on which the guarantee was made
become invalid, what recovery is possible?

Hilarie

>>> Eric Dean <eric@crystalballinc.com> 03/31/01 04:40PM >>>

I'm a bit confused how routing loops would occur, whether transient or
not, on an internetwork interface especially when the content delivery
uses a completely different network protocol.

Request routing to a peered network should usually result in an utltimate
if not penultimate resolution to a surrogate. Even during transients, it
would be assumed that a CDN network should be converged prior to making
a CDI advertisement.  MPLS makes such an assumption.

In other words, a CDN should be very sure of being capable of delivering
end-to-end content prior to making a CDI advertisement.