ZyXEL Communications XGS2220 Series User Manual page 368

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 196 IEEE 802.1Q VLAN Terminology
VLAN PARAMETER
VLAN Type
VLAN Administrative
Control
VLAN Tag Control
VLAN Port
56.2.0.2 Port VLAN Trunking
Enable VLAN Trunking on a port to allow frames belonging to unknown VLAN groups to pass through
that port. This is useful if you want to set up VLAN groups on end devices without having to configure the
same VLAN groups on intermediary devices.
Refer to the following figure. Suppose you want to create VLAN groups 1 and 2 (V1 and V2) on devices
A and B. Without VLAN Trunking, you must configure VLAN groups 1 and 2 on all intermediary switches C,
D and E; otherwise they will drop frames with unknown VLAN group tags. However, with VLAN Trunking
enabled on ports in each intermediary switch you only need to create VLAN groups in the end devices
(A and B). C, D and E automatically allow frames with VLAN group tags 1 and 2 (VLAN groups that are
unknown to those switches) to pass through their VLAN trunking ports.
Figure 266 Port VLAN Trunking
Chapter 56 VLAN
TERM DESCRIPTION
Permanent VLAN This is a static VLAN created manually.
Dynamic VLAN This is a VLAN configured by a GVRP registration or de-registration
process.
Registration Fixed Fixed registration ports are permanent VLAN members.
Registration Ports with registration forbidden are forbidden to join the specified
Forbidden 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 do not tag all outgoing
frames transmitted.
Port VID This is the VLAN ID assigned to untagged frames that this port
received.
Acceptable Frame You may choose to accept both tagged and untagged incoming
Type 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.
XGS2220 Series User's Guide
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