Gvrp - ZyXEL Communications MSC1000G User Manual

15.3.2 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
VLANs groups beyond the local switch.
Please refer to the following table for common IEEE 802.1Q VLAN terminology.
Table 320 IEEE 802.1Q VLAN Terminology
VLAN PARAMETER TERM
VLAN Type
VLAN Administrative
Control
VLAN Tag Control
VLAN Port
15.4 Tagged Frames Forwarding Example
First the MSC checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs to untagged
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frames.
The MSC then checks the VID in a frame's tag against the SVLAN table.
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The MSC notes what the SVLAN table says (that is, the SVLAN tells the MSC whether or not to
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forward a frame and if the forwarded frames should have a tag).
Then the MSC applies the port filter to finish the forwarding decision. This means that frames may
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be dropped even if the SVLAN says to forward them. Frames might also be dropped if they are sent
to a CPE (customer premises equipment) DSL device that does not accept tagged frames.
15.5 Untagged Frames Forwarding Example
An untagged frame comes in from the LAN.
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Management Switch Card User's Guide
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 don't 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 or just tagged 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
Chapter 15 VLAN Screens
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