ES-2048 User’s Guide

8.2 Automatic VLAN Registration

GARP and GVRP are the protocols used to automatically register VLAN membership across switches.

8.2.1 GARP

GARP (Generic Attribute Registration Protocol) allows network switches to register and deregister attribute values with other GARP participants within a bridged LAN. GARP is a protocol that provides a generic mechanism for protocols that serve a more specific application, for example, GVRP.

8.2.1.1 GARP Timers

Switches join VLANs by making a declaration. A declaration is made by issuing a Join message using GARP. Declarations are withdrawn by issuing a Leave message. A Leave All message terminates all registrations. GARP timers set declaration timeout values.

8.2.2 GVRP

GVRP (GARP VLAN Registration Protocol) is a registration protocol that defines a way for switches to register necessary VLAN members on ports across the network. Enable this function to permit VLANs groups beyond the local switch.

Please refer to the following table for common GARP terminology.

Table 13 IEEE 802.1q Terminology

VLAN PARAMETER

TERM

DESCRIPTION

 

 

 

VLAN Type

Permanent VLAN

This is a static VLAN created manually.

 

 

 

 

Dynamic VLAN

This is a VLAN configured by a GVRP registration/

 

 

deregistration process.

VLAN Administrative

Registration Fixed

Fixed registration ports are permanent VLAN members.

Control

 

 

 

Registration

Ports with registration forbidden are forbidden to join the

 

Forbidden

specified VLAN.

 

Normal Registration

Ports dynamically join a VLAN using GVRP.

 

 

 

VLAN Tag Control

Tagged

Ports belonging to the specified VLAN tag all outgoing

 

 

frames transmitted.

 

Untagged

Ports belonging to the specified don't tag all outgoing

 

 

frames transmitted.

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Chapter 8 VLAN