Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 698

Configuring GMRP
Modifying the GARP timer values affects the behavior of all GARP applications running on the
Note
switch, not just GMRP. (For example, GVRP uses the same timers.)
The only ports that send out the GMRP LeaveAll messages are the ports that have previously received
Note
GMRP joins.
You can modify the default GARP timer values on the switch.
When setting the timer values, the value for leave must be equal to or greater than three times the join
value (leave >= join * 3). The value for leaveall must be greater than the value for leave (leaveall >
leave). The more registered attributes on the switch, the greater you should configure the difference
between the leave value and the join value.
For better performance on switches with many registered multicast groups, increase the timer values to
the order of seconds.
If you attempt to set a timer value that does not adhere to these rules, an error is returned. For example,
if you set the leave timer to 600 ms and you attempt to configure the join timer to 350 ms, an error is
returned. Set the leave timer to at least 1050 ms and then set the join timer to 350 ms.
Set the same GARP timer values on all Layer 2-connected devices. If the GARP timers are set
Caution
differently on the Layer 2-connected devices, GARP applications (for example, GMRP and GVRP)
do not operate successfully.
To set the GARP timer values, perform this task in privileged mode:
Task
Step 1
Set the GARP timer values.
Step 2
Verify the configuration.
This example shows how to set the GARP timers and verify the configuration:
Console> (enable) set garp timer leaveall 12000
GMRP/GARP leaveAll timer value is set to 12000 milliseconds.
Console> (enable) set garp timer leave 650
GMRP/GARP leave timer value is set to 650 milliseconds.
Console> (enable) set garp timer join 300
GMRP/GARP join timer value is set to 300 milliseconds.
Console> (enable) show garp timer
Timer
--------
Join
Leave
LeaveAll
Console> (enable)
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
40-18
Timer Value (milliseconds)
--------------------------
300
650
12000
Chapter 40 Configuring Multicast Services
Command
set garp timer {join | leave | leaveall}
timer_value
show garp timer
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