Garp Vlan Registration Protocol (Gvrp); Important Points To Remember - Dell S6100 Configuration Manual

GARP VLAN Registration Protocol (GVRP)

The generic attribute registration protocol (GARP) VLAN registration protocol (GVRP), defined by the IEEE 802.1q specification, is a Layer
2 network protocol that provides for automatic VLAN configuration of switches. GVRP-compliant switches use GARP to register and de-
register attribute values, such as VLAN IDs, with each other.
Typical virtual local area network (VLAN) implementation involves manually configuring each Layer 2 switch that participates in a given
VLAN. GVRP, defined by the IEEE 802.1q specification, is a Layer 2 network protocol that provides for automatic VLAN configuration of
switches. GVRP-compliant switches use GARP to register and de-register attribute values, such as VLAN IDs, with each other.
GVRP exchanges network VLAN information to allow switches to dynamically forward frames for one or more VLANs. Therefore, GVRP
spreads this information and configures the needed VLANs on any additional switches in the network. Data propagates via the exchange of
GVRP protocol data units (PDUs).
The purpose of GVRP is to simplify (but not eliminate) static configuration. The idea is to configure switches at the edge and have the
information dynamically propagate into the core. As such, the edge ports must still be statically configured with VLAN membership
information, and they do not run GVRP. It is this information that is propagated to create dynamic VLAN membership in the core of the
network.

Important Points to Remember

• GVRP propagates VLAN membership throughout a network. GVRP allows end stations and switches to issue and revoke declarations
relating to VLAN membership.
• VLAN registration is made in the context of the port that receives the GARP PDU and is propagated to the other active ports.
• GVRP is disabled by default; enable GVRP for the switch and then for individual ports.
• Dynamic VLANs are aged out after the LeaveAll timer expires three times without receipt of a Join message. To display status, use the
show gvrp statistics {interface interface | summary} command.
Dell(conf)#protocol spanning-tree pvst
Dell(conf-pvst)#no disable
% Error: GVRP running. Cannot enable PVST.
.........
Dell(conf)#protocol spanning-tree mstp
Dell(conf-mstp)#no disable
% Error: GVRP running. Cannot enable MSTP.
.........
Dell(conf)#protocol gvrp
Dell(conf-gvrp)#no disable
% Error: PVST running. Cannot enable GVRP.
% Error: MSTP running. Cannot enable GVRP.
Topics:
• Configure GVRP
• Enabling GVRP Globally
• Enabling GVRP on a Layer 2 Interface
• Configure GVRP Registration
• Configure a GARP Timer
332 GARP VLAN Registration Protocol (GVRP)
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