We own a few blocks of IP addresses. At several distinct sites we currently advertise our own prefixes on our routers to our upstream transit provider. We are not anycasting. One /24 is originated out of one location, another at another location, etc.
In order to simplify network management we may want our provider to advertise our prefix from their ASN on our behalf. Our provider has the capability to do this. I am wondering if there are any 'gotchas' as I want to get ahead of them?
My plan is roughly to:
- Drop BGP on our routers with the provider.
- Have them advertise.
- Put original IP that was on routers on either provider equipment or L3 switch with a static router to the provider.
I'm worried about the possibility of 'blackholing' traffic.
The provider mentioned I should update the routing DB (radb.net) prior to making this change. Our IP addresses are currently in use. Will updating the RADB prematurely cause other providers to reject routes to my prefixes while I am awaiting the change?
How long should you typically wait after changing the routing DB? I assume that providers 'suck down' this DB at different times to build their prefix lists.
How risky is this in your opinion? There's always a chance that random providers or even my provider's upstream peers do not update their prefix lists and reject routes originated from a foreign AS.