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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 51 Configuring Multicast Services
Configuring GMRP on the Switch
Leave = 600
LeaveAll = 10000
Port based GMRP Configuration:
GMRP-Status Registration ForwardAll Port(s)
----------- ------------ ---------- --------------------------------------------
Enabled Normal Disabled 1/1-4
2/1-9,2/11-48
3/1-24
5/1
Enabled Forbidden Disabled 2/10
Console> (enable)
Setting the GARP Timers
Note
The commands
set gmrp timer
and
show gmrp timer
are aliases for
set garp timer
and
show garp
timer
. The aliases may be used if desired.
Note
Modifying the GARP timer values affects the behavior of all GARP applications running on the switch,
not just GMRP. (For example, GVRP uses the same timers.)
Note
The only ports that send out the GMRP leaveall messages are the ports that have previously received the
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 the 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.
Caution
Set the same GARP timer values on all Layer 2-connected devices. If the GARP timers are set differently
on the Layer 2-connected devices, the GARP applications (for example, GMRP and GVRP) do not
operate successfully.
To set the GARP timer values, perform this task in privileged mode:
Task
Command
Step 1
Set the GARP timer values.
set garp timer
{
join
|
leave
|
leaveall
}
timer_value
Step 2
Verify the configuration.
show garp timer
