Tuesday, May 1, 2018

Advertising private AS and new public AS to same peer?

Long story short, We are building a rural fiber network, We have been using a borrowed /23 from another rural ISP an announcing that to them via bgp using a private ASN, they strip the private and announce it upstream. We just got approved and now "own" a /21.

I figured I could keep the setup for the borrowed pool and add another BGP profile and announce that via our real AS but the juniper won't let you announce a private AS and subnet plus a public AS and different subnet to the same peer (unless i'm missing something...)

What is the best way to keep our "borrowed" IP space working AND get our new IP space working so I can get all the servers, equipment etc moved over to the new IP space without trying to "fuck it we do it live" and pulling an all-nighter?



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