You shouldn't have a problem at all. I have done this a few times, just make sure that both ISP's know you have a multihomed network and what block the other ISP provided. Just like Jason mentioned, it's AS to AS...but we had a situation where the ISP had to add the other ISP's block into an access list.
Most of the bigger providers will have a form to fill out, with Sprint and WCOM they ask if you are multihomed and also ask for all of the public blocks You're good with it... -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Steven A. Ridder Sent: Thursday, May 02, 2002 4:28 PM To: [EMAIL PROTECTED] Subject: BGP question [7:43163] Here's a question I can't seem to answer. I came up with a scenario in my head, and now I can't find a solution. Example: I have a dual homed network via BGP. I have ISP 1 and they give me 209.21.220.1/20 for use, and ISP gives me 199.33.23.1/21. Say I use the 209.x.x.x for my web servers, mail server, etc, and advertise that back out to the Internet via ISP 1 (the ISP that assigned me the block) and in DNS. I'm assuming ISP 2 will not advertise that block for me, as it's ISP 1's block. So, now the whole world knows to get to me via ISP 1. Then let's say ISP 1 goes down, how would the world know how to get to me, if they only knew how to get to me Via ISP 1 and it's IP's? -- RFC 1149 Compliant Get in my head: http://sar.dynu.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=43192&t=43163 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
