3Com Switch 8807, Configuration Manual

Page: 84 / 883

84 C
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.
Setting the GARP Timer 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
Operation Command
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
undo garp timer leaveall