Reference Guide

GARP VLAN Registration Protocol (GVRP) | 355
Based on the configuration in the example shown in Figure 17-5, the interface 1/21 will not be removed
from VLAN 34 or VLAN 35 despite receiving a GVRP Leave message. Additionally, the interface will not
be dynamically added to VLAN 45 or VLAN 46, even if a GVRP Join message is received.
Figure 17-5. Configuring GVRP Registration
Configuring a GARP Timer
GARP timers must be set to the same values on all devices that are exchanging information using GVRP:
• Join: A GARP device reliably transmits Join messages to other devices by sending each Join message
two times. Use this parameter to define the interval between the two sending operations of each Join
message. The FTOS default is 200ms.
• Leave: When a GARP device expects to de-register a piece of attribute information, it will send out a
Leave message and start 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
FTOS default is 600ms.
• LeaveAll: Upon startup, a GARP device globally starts a LeaveAll timer. Upon expiration of this
interval, it will send 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 FTOS default is 10000ms.
Figure 17-6. Configuring GVRP Registration
FTOS(conf-if-gi-1/21)#gvrp registration fixed 34,35
FTOS(conf-if-gi-1/21)#gvrp registration forbidden 45,46
FTOS(conf-if-gi-1/21)#show conf
!
interface GigabitEthernet 1/21
no ip address
switchport
gvrp enable
gvrp registration fixed 34-35
gvrp registration forbidden 45-46
no shutdown
FTOS(conf-if-gi-1/21)#
FTOS(conf)#garp timer leav 1000
FTOS(conf)#garp timers leave-all 5000
FTOS(conf)#garp timer join 300
Verification:
FTOS(conf)#do show garp timer
GARP Timers Value (milliseconds)
----------------------------------------
Join Timer 300
Leave Timer 1000
LeaveAll Timer 5000
FTOS(conf)#