Chapter 7 VLAN
GS3700/XGS3700 Series User’s Guide
82
7.2 Automatic VLAN Registration
GARP and GVRP are the protocols used to automatically register VLAN membership across switches.
7.2.1 GARP
GARP (Generic Attribute Registration Protocol) allows network switches to register and de-register
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
.
7.2.1.1 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 Declarations are withdrawn by issuing a Leave message.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.
7.2.2 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 VLAN
groups beyond the local Switch.
Please refer to the following table for common IEEE 802.1Q VLAN terminology.
Table 29
IEEE 802.1Q VLAN 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
Control
Registration Fixed
Fixed registration ports are permanent VLAN members.
Registration
Forbidden
Ports with registration forbidden are forbidden to join the
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 VLAN don't tag all outgoing
frames transmitted.
VLAN Port
Port VID
This is the VLAN ID assigned to untagged frames that this
port received.
Acceptable Frame
Type
You may choose to accept both tagged and untagged
incoming frames, just tagged incoming frames or just
untagged incoming frames on a port.
Ingress filtering
If set, the Switch discards incoming frames for VLANs that do
not have this port as a member.