11-33
Port-Based Virtual LANs (VLANs) and GVRP
GVRP
GVRP
GVRP—GARP VLAN Registration Protocol—is an application of the Generic
Attribute Registration Protocol—GARP. GVRP is defined in the IEEE 802.1Q
standard, and GARP is defined in the IEEE 802.1D-1998 standard.
Note To understand and use GVRP you must have a working knowledge of 802.1Q
VLAN tagging. (See “Port-Based Virtual LANs (Static VLANs)” on page 11-3.)
GVRP uses “GVRP Bridge Protocol Data Units” (“GVRP BPDUs”) to “adver-
tise” static VLANs. In this manual, a GVRP BPDU is termed an advertisement.
Advertisements are sent outbound from ports on a switch to the devices
directly connected to those ports.
GVRP enables the Switches 2650 and 6108 to dynamically create 802.1Q-
compliant VLANs on links with other devices running GVRP. This enables the
switch to automatically create VLAN links between GVRP-aware devices. (A
GVRP link can include intermediate devices that are not GVRP-aware.) This
operation reduces the chances for errors in VLAN configuration by automat-
ically providing VLAN ID (VID) consistency across the network. That is, you
can use GVRP to propagate VLANs to other GVRP-aware devices instead of
manually having to set up VLANs across your network. After the switch
creates a dynamic VLAN, you can optionally use the CLI static <vlan-id>
command to convert it to a static VLAN or allow it to continue as a dynamic
VLAN for as long as needed. You can also use GVRP to dynamically enable
port membership in static VLANs configured on a switch.
Feature Default Menu CLI Web
view GVRP configuration n/a page 11-42 page 11-43 page 11-46
list static and dynamic VLANs
on a GVRP-enabled switch
n/a — page 11-45 page 11-46
enable or disable GVRP disabled page 11-42 page 11-44 page 11-46
enable or disable GVRP on
individual ports
enabled page 11-42 page 11-44 —
control how individual ports
will handle advertisements for
new VLANs
Learn page 11-42 page 11-44 page 11-46
convert a dynamic VLAN to a
static VLAN
n/a — page 11-46 —
configure static VLANs DEFAULT_VLAN
(VID = 1)
page 11-10 page 11-15 page 11-46
!Software.book Page 33 Thursday, October 10, 2002 6:10 PM
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