validating reachability via an ISP

[aa at qrator.net (Alexander Azimov)]

Hi Andy,

You can use Qrator.Radar API: https://api.radar.qrator.net/.
The get-all-paths method will return the set of active paths for selected
prefix.


2018-03-29 2:22 GMT+03:00 Andy Litzinger <andy.litzinger.lists at gmail.com>:

> Hi all,
>   I have an enterprise network and do not provide transit. In one of our
> datacenters we have our own prefixes and rely on two ISPs as BGP neighbors
> to provide global reachability for our prefixes.  One is a large regional
> provider and the other is a large global provider.
>
> Recently we took our link to the global provider offline to perform
> maintenance on our router.  Nearly immediately we were hit with alerts that
> our prefix was unreachable and BGPMon alerted that nearly 80 AS's noted our
> route had been withdrawn.  We were not unreachable from every AS, but we
> certainly were from some of the largest.
>
> The root cause is that the our prefix is not being adequately
> re-distributed globally by the regional ISP.  This is unexpected and we are
> working through this with them now.
>
> My question is, how can I monitor global reachability for a prefix via this
> or any specific provider I use over time?  Are there various route-servers
> I can programmatically query for my prefix and get results that include AS
> paths? Then I could verify that an "acceptable" number of paths exist that
> include the AS of the all the ISPs I rely upon.  And what would an
> "acceptable" number of alternate paths be?
>
>
> thanks in advance,
>   -andy
>



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