On Sun, Oct 19, 2008 at 04:36:41AM, Hank Nussbacher wrote: > I am curious if anyone else uses conditional BGP as a poor man's DRP? > > Suppose you have site A with 192.168.1.0/24. The site is > connected to 2 upstream ISPs and they have a number of > servers at site A. They now create a DRP site (site B), > which is also connected to 2 upstream ISPs and they > create a mirror copy of those servers from site A over at > site B and assign them the *exact* same IP addresses as at > site A. They have the router at site B do conditional BGP, > checking to see if it sees 192.168.1.0/24 from the Internet. > As soon as it disappears (site A is gone), site B starts > announcing 192.168.1.0/24 to the Internet and all the DRP > servers at site B are suddenly active. Ignoring the syncing > of the servers from site B to site A, what is the downside > of such a "poor mans' DRP solution?
I've done something similiar, but went with what I perceived to be the somewhat less complex route of advertising the routes from both places at all times, but with AS Prepending and such so that Site A was always preferred when reachable. It worked well, and no DNS games required for failover. -Terry _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
