I have a client who's company was split in half. One half is keeping their IP ranges and ASN, and the other half must be reconfigured with a new
ASN and IP block. We have obtained the new ASN and block from ARIN and have peering agreements in place. The routers are still advertising the old ASN, and we need to make a cutover. What is the most efficient way to cut to the new IPs and ASN with the minimum amount of downtime?
I have not done it but how about using the BGP 'local-as' feature. Have the neighbor AS peer with your new AS as true ebgp connection with ' local-as ' command and advertise the new IP ranges to the BGP neighbor.Once everything stabilizes then start taking out the older IP ranges from the router.
I will let someone else comment on that as well and its been a while and I need to brush up my things again.
Thanks everyone. I was already looking into this but wanted to check here to make sure that I was going down the correct path. We're going to do this next Monday and I will post back with status and ratings.
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