What is Active-Passive Redundancy?
Active-Passive Redundancy is a high availability mode of operation whereby two or more identical instances of the same network device or appliance operate simultaneously but only instances marked as active serve client requests.
If an active instance goes offline, passive instances begin to operate as active nodes servicing requests.
Mechanisms such as Virtual Router Redundancy Protocol (VRRP) along with floating IPs can be used to facilitate seamless network endpoint failover among the active-passive redundant instances.
What is Active-Active Redundancy?
Active-Active Redundancy is a high availability mode of operation whereby two or more instances of the same network device or appliance serve clients simultaneously and interchangeably.
A client can connect to any one instance and have requests served in the same way.
If any of the identical instances go offline, any of the other instances can seamlessly serve requests while client sessions persist.