On Sun, Sep 27, 2020 at 8:53 AM Dmitry Sherman <dmitry@interhost.net> wrote:
Can you recommend software or cloud based solution which monitors if a prefix is advertised to a peer (via his Looking Glass for example) & if traffic is passing thru an interface and if one of them is false it announce this prefix via other upstream providers & remove blackholes?
Hello, You seem to be looking for external automation to do something that's baked into BGP. Any particular reason? * Announce to all upstreams all the time. * Use prepends on the less-preffered upstreams. * If the less preferred upstream is localprefing to use your routes despite the prepend, ask them what BGP community you should set to disable that behavior. * If an upstream propagates your route without passing your packets often enough to need automation, cancel the contract. I could see value in something local that measures things like packet loss rates and cuts the primary if they get higher than acceptable, but that wouldn't be a cloud service because the cloud wouldn't be reliably reachable when you need to act on that information. Regards, Bill Herrin -- William Herrin bill@herrin.us https://bill.herrin.us/