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Chapter 10 VLAN
10.1.2 VLAN Tagging Priority
When the Switch is IEEE 802.1Q VLAN-enabled, all incoming tagged traffic is forwarded according
to the VLAN table on the Switch. If the incoming traffic is untagged, the Switch applies the VLAN
rules based on the following priority:
MAC-based VLAN > Subnet-based VLAN > Protocol-based VLAN > PVID
10.2 Automatic VLAN Registration
GARP and GVRP are the protocols used to automatically register VLAN membership across switches.
10.2.1 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.
10.2.1.1 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 Declarations are withdrawn by issuing a Leave message.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.
10.2.2 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 41 IEEE 802.1Q VLAN Terminology
VLAN PARAMETER TERM
VLAN Type
VLAN Administrative
Control
VLAN Tag Control
130
DESCRIPTION
Permanent VLAN
This is a static VLAN created manually.
Dynamic VLAN
This is a VLAN configured by a GVRP registration/deregistration
process.
Registration Fixed
Fixed registration ports are permanent VLAN members.
Registration
Ports with registration forbidden are forbidden to join the
Forbidden
specified VLAN.
Normal Registration
Ports dynamically join a VLAN using GVRP.
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.
VES1724-56 User's Guide
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