====== B ======

  * BGP = Border Gateway Protocol
    * Wikipedia: standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet
    * Variants: Internal BGP within an AS, External BGP on the internet
  * Blue/Green deployment: a progressive deployment strategy in which both versions get a part of traffic which varies over time, avoiding by cache stampedes on the new release and preserving user experience for the duration of a session in most cases.
    * It instantiates a new version and then moves traffic to it when its resources are stable.
    * The blue version (your original version) can be kept up for possible rollback and eventually be decommissioned or used for a subsequent update. There is no downtime associated with blue/green deployments.
    * Compare with [[gcp:r|Red-black]], [[gcp:r|rolling updates]]