can buy and hardware loadbalancer from f5. > > From: "Robert Fowler" > Date: 2003/01/15 Wed AM 09:31:49 EST > To: [EMAIL PROTECTED] > Subject: BGP load balancing questions [7:61095] > > 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 Greg Owens 202-398-2552
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