Check prefix visibility via specific upstream ASNs #1526
Description
I was checking whether path matching could help us implement continuous checks of whether all of our sites have all of their prefixes visible via both Upstream providers. We do have all the data necessary to build a suitable ruleset. However I've not been able to do this and I'm positive it would require some code changes, correct?
It may even be suitable to do this as part of the visibility monitor, eg. supply an ASN or list of Upstream ASNs as a parameter and alert once they fail to advertise the prefix?
An example:
Prefix P is advertised to AS100 and AS200. There may also be peers, IXPs etc. so this list is not exhaustive. We need to alert if we find AS100 not advertising P or AS200 not advertising P. Additional advertisements via AS300 are fine and should not trigger alerts.
We'd consider this a very useful feature and might be able to look into contributing ourselves if this idea is received positively.