My choice would be full routing tables from both ISP's, the customer to change his local pref on the backup link. if done correctly his own address space will not be advertised to the backup ISP as it would be advertised from the the backup ISP to the client.
When the primary link fails the backup BGP link would see its own prefix's disappear and start advertising its own prefix's out the backup link with a 60 sec delay of course. Thus avoiding problems with private peering arrangements, where asymetric routing happens. Good luck have fun Simon -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of a. rahman isnaini r.sutan Sent: 23 September 2008 14:19 To: Paul Stewart Cc: 'cisco-nsp' Subject: Re: [c-nsp] Conditional BGP Hi, My choice : Inject them a default route & ask them to prepend their prefixes to you rgs a. rahman isnaini rangkayo sutan Paul Stewart wrote: > Hi folks.. > > > > We have a couple of customers that are looking to purchase an Internet > connection from us - this will be a BGP feed to each customer as they > are multihomed today etc. > > > > Normally, we would just supply a full table and let them decide what > to do with it. In this scenario, they both wish to use us as a backup > provider and wish to ONLY use our network if their primary provider (Cogent) is down. > > > > What is common practice for this scenario? We would still prefer to > just send a full table and put the control into their hands but I'm > also concerned if they will have the technical expertise to accomplish > this.. On their side, what would be common practice? I've been > looking at conditional BGP advertisements using route-maps but don't > believe that's the best solution.. > > > > Thanks for your input. > > > > Paul > > > > > > > > _______________________________________________ > 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/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
