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16. GARP VLAN Registration
Protocol (GVRP)
Introduction
GVRP (GARP VLAN Registration Protocol) is part of the IEEE 802.1Q standard for Virtual
Bridged LANs, sponsored by the LAN MAN standards Committee of the IEEE Computer
Society. The GVRP protocol allows a LAN device to notify neighbors that it is prepared to
receive packets for one or more VLANs. The main purpose of the GVRP is to allow GVRP-
aware devices to automatically obtain VLAN information without requiring each device to be
manually configured to obtain this information. Network servers can also run GVRP. These
servers are usually configured to join several VLANs, and then notify the network switches of
the VLANs they want to join. The dynamic VLANs that were learned can be viewed by the
command
show vlan dynamic
(For more information, see the Commands to Display the VLAN
Configuration section in the VLANs (Virtual LANs) chapter).
Configuring and Displaying GVRP Settings
You can use the following GVRP commands:
Table 16-1 GVRP Commands
C o m m a n d D e s c r i p t i o n
gvrp
Displays the GVRP.
show gvrp
Displays the GVRP status.
gvrp enable
Enables GVRP.
gvrp disable
Disables GVRP.
no gvrp
Disables GVRP.
Table 16-2 GVRP-Related Commands
C o m m a n d D e s c r i p t i o n
garp timer
Sets the GARP timer values.
show garp timerport gvrp
enableport gvrp disable
Displays the GARP timer configuration.Enables GVRP on
thespecified port.Disables GVRP on thespecified port.