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HP Velocity Server Side Deployment Guide 10

HP Velocity functional overview Establishing a connection

Beaconing

Once an HP Velocity-enabled endpoint detects that a bidirectional network path is available, it

periodically modifies packet headers (both IP and TCP) in a seamless way to advertise itself to

other HP Velocity-enabled endpoints (Figure 2).

IP headers can contain both IP ID-based beacons (using an option value of 0x420B) and IP

Option-based beacons (using an option value of 0x880477FB). TCP flows can use TCP

Option-based beacons (using an option value of 0x01 No-Operation and seven sets of End of

Option Lists 00000000000000).

Once an HP Velocity-enabled endpoint processes enough beacons on a network flow to

discover that another HP Velocity-enabled endpoint is at the other end, handshaking occurs.

Figure 2. IPQ beaconing

Handshaking

An HP Velocity-enabled endpoint will initiate a three-way handshaking procedure with an

HP Velocity-enabled endpoint discovered during beaconing. Once the handshake is

completed, both HP Velocity-enabled endpoints enter the protected state.

Protected state

In the protected state, HP Velocity-enabled endpoints exchange information about current and

trending network conditions. This information is then used to intelligently activate and adjust

various optimizers.

NOTE: The use of TCP Option-based beacons for TCP flows and IP

Option-based beacons for UDP flows can be controlled through the

HP Velocity Policy Engine.

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HP MT40 Guide de l'utilisateur Page 10