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not be unconfigured when it receives a Leave PDU. Therefore, the registration mode on that interface
is FIXED.
• Forbidden Mode — Disables the port to dynamically register VLANs and to propagate VLAN
information except information about VLAN 1. A port with forbidden registration type thus allows only
VLAN 1 to pass through even though the PDU carries information for more VLANs. Therefore, if you
do not want the interface to advertise or learn about particular VLANS, set the interface to the
registration mode of FORBIDDEN.
Based on the configuration in the following example, the interface 1/21 is not removed from VLAN 34 or
VLAN 35 despite receiving a GVRP Leave message. Additionally, the interface is not dynamically added to
VLAN 45 or VLAN 46, even if a GVRP Join message is received.
Example of the gvrp registration Command
Dell(conf-if-te-1/21)#gvrp registration fixed 34,35
Dell(conf-if-te-1/21)#gvrp registration forbidden 45,46
Dell(conf-if-te-1/21)#show conf
!
interface TenGigabitEthernet 1/21
no ip address
switchport
gvrp enable
gvrp registration fixed 34-35
gvrp registration forbidden 45-46
no shutdown
Dell(conf-if-te-1/21)#
Configure a GARP Timer
Set GARP timers to the same values on all devices that are exchanging information using GVRP.
There are three GARP timer settings.
• Join — A GARP device reliably transmits Join messages to other devices by sending each Join
message two times. To define the interval between the two sending operations of each Join message,
use this parameter. The default is 200ms.
• Leave — When a GARP device expects to de-register a piece of attribute information, it sends out a
Leave message and starts this timer. If a Join message does not arrive before the timer expires, the
information is de-registered. The Leave timer must be greater than or equal to 3x the Join timer. The
default is 600ms.
• LeaveAll — After startup, a GARP device globally starts a LeaveAll timer. After expiration of this interval,
it sends out a LeaveAll message so that other GARP devices can re-register all relevant attribute
information. The device then restarts the LeaveAll timer to begin a new cycle. The LeaveAll timer must
be greater than or equal to 5x of the Leave timer. The default is 10000ms.
Example of the garp timer Command
Dell(conf)#garp timer leav 1000
Dell(conf)#garp timers leave-all 5000
Dell(conf)#garp timer join 300
Verification:
Dell(conf)#do show garp timer
GARP Timers Value (milliseconds)
----------------------------------------
Join Timer 300
Leave Timer 1000
382
GARP VLAN Registration Protocol (GVRP)