[x] Allow prefix in our ACLs (`prefix-list wikimedia4`) - `198.35.26.0/23` already present (and used as `orlonger`)
[x] Create ARINs IRR DB objects (route & inetnum object for `198.35.26.0/24` and `198.35.27.0/24`)
[x] Create RPKI ROAs for `198.35.26.0/24` and `198.35.27.0/24`
[x] Confirm records are correct with http://irrexplorer.nlnog.net/search/AS14907 and Routinator
[x] Wait at least 24h for providers to pickup new records
[x] Depool ulsfo - https://gerrit.wikimedia.org/r/597738
[x] Shrink ulsfo's `198.35.26.0/23` to `198.35.26.0/24` (`aggregate`, `bgp-out`, `pop4`) - https://gerrit.wikimedia.org/r/597486
[x] Verify prefix is propagated properly ([[ https://stat.ripe.net/widget/looking-glass#w.resource=198.35.26.0/24 | looking glass ]])
[x] Repool ulsfo - https://gerrit.wikimedia.org/r/597742
[x] Delete ulsfo's `198.35.26.0/23` from ARIN IRR
[x] Delete ulsfo's `198.35.26.0/23` RPKI ROA
[x] Confirm records are correct with http://irrexplorer.nlnog.net/search/AS14907
[] Configure conditional aggregate advertising to peers of `198.35.27.0/24` ("only if one local contributing route" + `bgp-out`) - https://gerrit.wikimedia.org/r/597603
[] Configure routers/authdns BGP sessions (can be done out of order)
[x] Accept `198.35.27.0/24` IPs from anycast peers (can be done out of order) - https://gerrit.wikimedia.org/r/597507
[] Add `198.35.27.27` to `border-in4 term authdns` (can be done out of order) - https://gerrit.wikimedia.org/r/597598
[] Verify prefix is propagated properly ([[ https://stat.ripe.net/widget/looking-glass#w.resource=198.35.27.0/24 | looking glass ]])
[] Test that it's not being advertised if no local contributing route exist