Dell Force10 MXL Blade - Configuring a GARP Timer

GARP VLAN Registration Protocol (GVRP) | 209
• Normal Registration: Allows dynamic creation, registration, and de-registration of VLANs (if you
enabled dynamic VLAN creation). By default, the registration mode is set to normal when you enable
GVRP on a port. This default mode enables the port to dynamically register and de-register VLANs,
and to propagate both dynamic and static VLAN information.
• Fixed Registration Mode: Configuring a port in fixed registration mode allows for manual creation
and registration of VLANs, prevents VLAN de-registration, and registers all VLANs known on other
ports on the port. For example, if an interface is statically configured using the command line interface
(CLI) to belong to a VLAN, it should not be un-configured when it receives a Leave PDU. So, 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. So, set the
interface to registration mode of FORBIDDEN if you do not want the interface to advertise or learn
about particular VLANS.
Based on the configuration in the example shown in Figure 11-5, 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.
Figure 11-5. 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 sends 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: 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 FTOS default is 10000ms.
FTOS(conf-if-te-1/21)#gvrp registration fixed 34,35
FTOS(conf-if-te-1/21)#gvrp registration forbidden 45,46
FTOS(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
FTOS(conf-if-te-1/21)#