HP 5820X series Configuration Manual page 158

LeaveAll timer
4.
When a GARP application is enabled, a LeaveAll timer starts. The GARP participant sends a LeaveAll
message when the timer expires. Then, the LeaveAll timer restarts to begin a new cycle. The LeaveAll
timer and all other GARP timers also restart when the GARP participant receives a LeaveAll message.
Because a LeaveAll message deregisters all attributes in the entire network, do not set the LeaveAll timer
too short. The LeaveAll timer should be at least longer than the Leave timer.
On a GARP-enabled network, a switch may send LeaveAll messages at the interval set by its LeaveAll
timer or the LeaveAll timer on another device on the network, whichever is smaller. This is because each
time a switch on the network receives a LeaveAll message it resets its LeaveAll timer.
GARP message format
Figure 49 GARP message format
As shown in
GARP message fields.
Table 20 Description on the GARP message fields
Field
GARP PDU
Protocol ID
Message
End mark
Attribute type
Attribute list
Figure 49, GARP messages use the IEEE 802.3 Ethernet frame format.
Description
GARP Protocol Data Unit
Protocol identifier for GARP PDU
One or multiple messages, each
containing an attribute type and
an attribute list
Indicates the end of a GARP PDU
Defined by the GARP application
Contains one or multiple attributes
Value
––
0x0001
––
0x00
0x01 for GVRP, indicating the
VLAN ID attribute
––
151
Table 20 describes the