You need to understand the source of the traffic and those network polices , all the pre-pending will do nothing if it avoids cogent . You might have to look to advertising more or less specific prefixes to get the desired result I don’t think this is Asia specific issue On Wed, Mar 9, 2022 at 5:33 AM Edvinas Kairys <edvinas.email@gmail.com> wrote:
Hello,
We've introduced Cogent network in Equinix Honk Kong DC. But seems via that link we're just receiving just only 5% of our traffic, other part of incoming traffic is received via our other ISPs like NTT, Simcentrc, and Equinix IXP. I know it's very naïve to expect the traffic load balance equally between 3 ISPs (4 if IXP is counted) using just one /24 subnet. According to most of BGP looking glasses in Asia, traffic via Cogent is least preferred even when i've added 6x prepend AS on our other mentioned providers to make route via Cogent more attractive. But nothing helps - seems main providers in Asia made routes via Cogent least preferable by lowering the local preference to it, that why prepending from our side doesn't help.
Maybe someone has experience or similar problems with ISPs in Asia network ?