Hi Hank It's a good question.
Your approach is good as mentioned by others in the thread, if you advertise both externally at the same time. Private peering agreements may still prefer the prepended route as it costs them less money. Hence do not advertise your prefix on the backup path as long as the backup ebgp peer is advertising the route back to you. This was done with local pref. simon -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hank Nussbacher Sent: 19 October 2008 09:36 To: [email protected] Subject: Re: [c-nsp] Conditional BGP At 09:47 PM 18-10-08 +0500, Masood Ahmad Shah 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? Regards, Hank >A nice book on BGP > >Practical BGP >By Russ White > >Regards, >Masood >BLOG: http://www.weblogs.com.pk/jahil > > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Mark Boolootian >Sent: Wednesday, September 24, 2008 6:06 AM >To: [EMAIL PROTECTED] >Cc: [email protected] >Subject: Re: [c-nsp] Conditional BGP > > > > 2) View the NANOG presentation archives. Several come to mind; I'll try >to > > compile a list of suggestions, or just browse away. > >Search the presentation archive for Smith and BGP. Philip Smith's >BGP tutorials are outstanding. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
