Hello groupstudy, I've been banging my head against the wall and figured I would defer this question to those of you more learned and experienced. Here is the the scenario: 2 routers running BGP Router 1 has a connection to ISP 1 and router 2 has a connection to ISP 2 Each receives full routes. Each provider has given us a class C address Only the class C from provider 1 is actively used, because provider 2 will probably be dropped eventually(ssshhh don't tell ARIN) The class C is advertised to both ISPs, however ISP 1 aggregates this address space so instead of being 1.1.1.x /24 it's 1.1.x.x /16 This was checked using various looking glasses. What that means is that traffic to my Class C will arrive primarily via ISP 2 because it will see the /24 I advertise though it. That is bad, for various reasons. Mainly because we are charged by usage from ISP2, but also because we are going to upgrade ISP1 to a fractional t3 and use ISP 2 primarily as a backup eventually. Also the traffic coming in is 90% via ISP 2 and 10% via ISP 1. If I remember from my studying so long ago, even prepending my AS number to ISP 2 will not work, becuase it doesn't even make it to that criteria, but rather see the /24 and chooses that route.
I searched some newsgroups, but amazingly enough nobody seemed to have this issue. I saw someone who had a larger block than /24 and some suggestions there but that would not work in this case. Options not available: Using the Class C from Carrier 2 to load balance using IP space and traffic types Getting a class C independant of a provider from ARIN. (That costs money :)) Robert Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=61095&t=61095 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
