In a general sense, high availability is a network topology feature that ensures mission critical applications are available 100% of the time. This goal is typically accomplished by having multiple access routers with multiple WAN interfaces. PacketShapers can sit in these redundant router topologies and perform their traffic management responsibilities, without disrupting the existing high availability configuration. PacketShapers integrate in high availability and redundant environments including HSRP (Hot Standby Routing Protocol) and VRRP (Virtual Router Redundancy Protocol).