Quick Reference Guide

220 | VLANs
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GARP Commands
In Global Config mode, you can enable GVRP, or GMRP, or both for the switch:
gvrp adminmode enable
gmrp adminmode enable: enables GARP Multicast Registration Protocol
(GMRP) on the system
gmrp interfacemode enable all: enables GARP Multicast Registration Protocol on
all interfaces
In Interface Config mode, enable GVRP for a port:
gvrp interfacemode enable
In Interface Config, Global Config, or Interface Range mode, set the timer values in centiseconds. For
interface-level changes, go to the individual interfaces to apply changes.
set garp timer join <10-100> The default is 20.
set garp timer leave <20-600> The default is 60.
set garp timer leaveall <200-6000> The default is 1000.
Using GVRP
GVRP is used to exchange a VLAN number—in this example, VLAN 3—dynamically from the switch on
which it is configured to the switch on which GVRP is enabled.
• GVRP must be enabled globally and on selected interfaces.
• One end must have a VLAN configured on an interface in order to establish a dynamic VLAN
connection on the other end. In the following example, R2 has VLAN 3 configured.
• Two switches link through a port, 1/0/2 in this case.
Enabling Dynamic VLANs with GVRP
Use the following command sequence on each switch participating in the dynamic VLAN:
Step Command Syntax Command Mode Usage
1 gvrp adminmode enable Global Config
Enable GVRP on each switch and on each port that
is to be part of the GVRP VLAN.
2
interface vlan vlan_id Global Config Specify a new or existing VLAN by VLAN number,
from 2–4094.
3 tagged unit/slot/port
Interface VLAN
Config
Add one or more ports to the VLAN.
4
no shutdown Interface VLAN
Config
Enable each port added to the VLAN.
5
show garp Privileged Exec Verify the GARP admin mode.