Allied-telesis AT 8000/8POE User Manual download pdf (Page 131)

AT-S81 Management Software User’s Guide

Section I: Using the Menus Interface 131

GVRP

This section describes GVRP and contains the following topics:

 “GVRP Overview,” next

 “Enabling or Disabling GVRP” on page 132

GVRP Overview The GARP VLAN Registration Protocol (GVRP) allows network devices to

share VLAN information. The main purpose of GVRP is to allow switches

to automatically discover some of the VLAN information that would

otherwise need to be manually configured in each switch. This is helpful in

networks where VLANs span more than one switch. Without GVRP, you

must manually configure your switches to ensure that the various parts of

a VLAN can communicate across the different switches. GVRP, which is

an application of the Generic Attribute Registration Protocol (GARP), does

this for you automatically.

Figure 32 provides an example of how the GVRP feature works:

Figure 32. GVRP Example

Switches 1 and 3 contain the Sales VLAN, but switch 2 does not.

Consequently, the end nodes of the two parts of the Sales VLANs are

unable to communicate with each other.

Without GVRP, you would need to configure switch 2 by creating a Sales

VLAN on the switch and adding ports 2 and 3 as members of the VLAN. If

you have a large network and a large number of VLANS, this type of

manual configuration can be cumbersome and time consuming. Instead,

let GVRP set up the communications path for you.

Guidelines Following are guidelines to observe when you use GVRP:

 Both ports that constitute a data link between the

switch and the other device must be running GVRP.

 You cannot modify a GVRP VLAN; you can only

enable or disable it.

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Allied-telesis AT 8000/8POE User Manual Page 131