HP 6125G Configuration Manual page 153

On a GARP-enabled network, each port maintains its own Hold, Join, and Leave timers, but only
•
one LeaveAll timer is maintained on each device. This LeaveAll timer applies to all ports on the
device.
• The value ranges for the Hold, Join, Leave, and LeaveAll timers are dependent on one another.
See Table 19
Set the LeaveAll timer greater than any Leave timer and not smaller than its default value, 1000
•
centiseconds. Each time a LeaveAll timer expires, a network-wide re-join occurs.
A device can send LeaveAll messages at the interval set by its LeaveAll timer or the LeaveAll timer
•
of another device on the network, whichever is smaller. This is because each time a device on the
network receives a LeaveAll message, it resets its LeaveAll timer.
GARP PDU format
Figure 45 GARP PDU format
Ethernet frame
DA SA
As shown in
Table 18 GARP PDU fields
Field
Protocol ID
Message
End mark
Attribute type
Attribute list
Attribute
Attribute length
for their dependencies.
Length DSAP SSAP
Protocol ID
Attribute type
Attribute 1
Attribute length Attribute event
Figure 45, GARP PDUs are encapsulated in IEEE 802.3 Ethernet frames.
Description
Protocol identifier for GARP
One or multiple messages, each of which
contains an attribute type and an attribute
list
Indicates the end of a GARP PDU
Defined by the GARP application
Contains one or multiple attributes
Consists of an attribute length, an attribute
event, and an attribute value
Length of an attribute, inclusive of the
attribute length field
Ctrl GARP PDU
Message 1 ...
Attribute list
... Attribute n
Attribute value
Value
0x0001
N/A
0x00
0x01 for GVRP, which indicates the VLAN
ID attribute
N/A
N/A
2 to 255 (in bytes)
144
Message n End mark
End mark