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HAPTER

 12: GARP&GVRP C

ONFIGURATION

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The value of GARP timer will be used in all the GARP applications, including 
GVRP and GMRP, running in one switched network.

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In one switched network, the GARP timers on all the switching devices should 
be set to the same value. Otherwise, GARP application cannot work normally.

GARP timers include Hold timer, Join timer, Leave timer and LeaveAll timer.

The GARP participant sends the Join Message regularly when Join timer times out 
so that other GARP participants can register its attribute values.

When the GARP participant wants to remove some attribute values, it sends the 
Leave Message. The GARP participant that receives the message starts the Leave 
timer. If the Join Message is not received again before the Leave timer expires, the 
GARP attribute values are removed

LeaveAll timer is started as soon as the GARP participant is enabled. The LeaveAll 
message is sent upon timeout so that other GARP participants remove all the 
attribute values of this participant. Then, LeaveAll timer is restarted and a new 
cycle begins.

When the switch receives some GARP registration information, it does not send 
the Join Message immediately. Instead, it enables a Hold timer and sends the Join 
Message upon timeout of the Hold timer. In this way, all the VLAN registration 
information received within the time specified by the Hold timer can be sent in 
one frame so as to save the bandwidth resources.

Configure Hold timer, Join timer and Leave timer in Ethernet port view. Configure 
LeaveAll timer in system view.

By default, Hold timer is 10 centiseconds, Join timer is 20 centiseconds, Leave 
timer is 60 centiseconds, and LeaveAll timer is 1000 centiseconds.

Note that, the value of Join timer should be no less than the doubled value of Hold 
timer, and the value of Leave timer should be greater than the doubled value of 
Join timer and smaller than the Leaveall timer value. Besides, you must set the 
value of the Join timer in terms of 5 centiseconds. Otherwise, the system will 
prompt message of error.

The value range of a timer varies with the values of other timers. So if the value of 
a timer you want to set is not within the available value range, you can change the 
value range by changing the values of other related timers.

Table 61   Set the GARP timer

Set GARP Hold timer, Join timer and Leave 
timer 

garp timer { hold | join | leave } timer_value 

Set GARP LeaveAll timer 

garp timer leaveall timer_value 

Restore the default settings of GARP Hold 
timer, Join timer and Leave timer 

undo garp timer { hold | join | leave } 

Restore the default settings of GARP LeaveAll 
timer