The Direct Standby function allows two PacketShapers to work in a redundant network topology, with each unit connected to a different router, and the two units directly connected to each other. Both units are considered active and each unit can receive and forward traffic.
Follow the link below for a High Availability Overview in PacketGuide:
The following are the requirements to set up Direct Standby:
Both PacketShapers are directly connected to each other through the OUTSIDE port on the upper-most or right-most LAN Expansion Module (LEM). Or on the PacketShaper 12000, the units are connected through their Standby ports.
Both PacketShapers must be running the same version of PacketWise and have the same plug-ins installed.
Both PacketShapers must have the same configuration limits (i.e. both PacketShapers must be 512-class PacketShaper 3500s). You should not mix PacketShapers with different capacities since the they will be passing the same traffic and require identical configurations.
Both PacketShapers must have identical hardware configuration: the same PacketShaper model, link speed, installed memory, number of LEMs installed, and type of LEMs (fiber optic vs. copper Ethernet).
The two PacketShapers must have the same touch password for the direct connection to be established.