On Wed, Nov 07, 2007 at 11:25:21AM +1100, Robin Whittle wrote: > Incremental deployment means (perhaps amongst other things) that > there are immediate overall benefits for the early adopters of a new > technology. Any scheme which requires complete upgrades of all BGP > routers, all hosts etc. is not at all incrementally adoptable. > Likewise, a scheme in which the address space managed by the new > system is unreachable from non-upgraded networks is not > incrementally deployable, because virtually all of the people who > might initially adopt this new space would find the loss of > connectivity a far greater problem than whatever benefits the new > system provided.
I wanted to chime in on this point. Incremental deployment is vital to the success of any new routing methodology. It doesn't matter how much of an improvement any of the available proposals produce if it cannot offer incremental deployment, as operators will simply not use it. For non-incrementally deployable methods, there are only two choices for a service provider like my organization. We can either build another instance of our entire service that uses the new method while the old one continues to use traditional routing until our last customer moves to the new scheme, or we can depend on a third-party for some sort of proxy service between the two routing regimes. The former is clearly financially impractical, and the latter would require a third-party capable of essentially zero downtime. Neither option is particularly palatable. I haven't read deep enough into all of the proposals to figure out which ones are incrementally deployable. While I slowly work on that, I hope that everyone involved keeps the practical requirements in mind. Thanks! -David -- David Williamson Operations Architecture Tellme, a Microsoft subsidiary <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
