H3C Technologies H3C S10500 Series Switches - Manual (Page 174)

163
A GARP participant starts a Leave timer when it receives a Leave message for an attribute value. If the
GARP participant receives no Join message for the attribute value before the timer expires, it deregisters
the attribute value.
4. LeaveAll timer
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.
NOTE:
•
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 52 GARP PDU format
As shown in Figure 52 , GARP PDUs are encapsulated in IEEE 802.3 Ethernet frames.
Table 19 GARP PDU fields
Field Description Value
Protocol ID Protocol identifier for GARP 0x0001
Message
One or multiple messages, each of which
contains an attribute type and an attribute
list
––
End mark Indicates the end of a GARP PDU 0x00
Attribute type Defined by the GARP application
0x01 for GVRP, which indicates the VLAN
ID attribute
Attribute list Contains one or multiple attributes ––