My org is preparing to multi-home. We have a legacy /16 that we own as well as a /24 from our current provider. Our plans are to start advertising a /24 out of our /16 so we can readdress at our discretion out of provider space. My question is: Do we need to advertise both /24s from both ebgp routers, or would it suffice to only advertise the ISP's /24 from their connection, and our own /24 from the new connection?
Hope my question is clear. Please let me know if more info is needed.
Giuseppe, our new ISP has given us their blessing to advertise the other ISP's /24 out the connection as well. What I'm looking for is reasons to do it or not. By the time I turn up our bgp sessions, we will not have re-addressed completely out of our existing range so it's not an option to only advertise our ISP-independent space only to both.
We currently use our ISP's netblock for about 95% of our services with only a very small portion being used out of our direct assignment ips....so, right now we'd really need to advertise both in order to have complete reachability. From earlier posts, I guess it would be acceptable to advertise only one from each, but then we would leave ourselves open to a failure in case one link went down...
So it seems as if advertising both would be the answer. You agree?
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...