High Availability using 2 sites -- yep, "propogation."

[lesmikesell at gmail.com (Les Mikesell)]

On Thu, 2006-01-05 at 12:18, Bryan J. Smith wrote:

> Exactomundo.  Even Google has to accomodate such.  That's why
> their model is piecemeal and localizes as much as they can.
> 
> But even Google has an ASN, AS15169, when it comes to their
> combined presence.

I think they know better than to try to flap BGP routing
around to accomodate a failed computer at one site or
another, though.  Is that what you are suggesting? 

BGP would normally be used to handle routing over multiple
paths to a fixed location and would change in response to
the route availability.  You can play tricks by shuffling
a route to a completely new destination if a whole site fails
but the minimum you could move would be a whole class
C at a time, and some bad things will happen during the
switch as different machines with the old IP's become visible.

-- 
  Les Mikesell
   lesmikesell@xxxxxxxxx