On 1/23/20 16:01, Brian wrote:
Hello all. I am having a hard time trying to articulate why a Dual Home ISP should have full tables. My understanding has always been that full tables when dual homed allow much more control. Especially in helping to prevent Async routes.
If you're multi-homed you'll have some asymmetric routes. Even if you aren't, they'll be asymmetric to your upstream. It's easy to manipulate which path traffic leaving your site takes, difficult or impossible to manipulate via which path it enters. If you have sufficient horsepower and memory in your routers, taking full tables won't hurt anything and will help in situations where one of your upstreams loses reachability to a destination. For belt-and-suspenders, take full routes plus a default.
Am I crazy?
Perhaps, but if so it has little if any relationship to the size of the BGP tables in your border routers. -- Jay Hennigan - jay@west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV