LevelOne GTL-2691 User Manual

Page 204

HAPTER

| VLAN Configuration

IEEE 802.1Q VLANs

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Ingress Filtering – Determines how to process frames tagged for

VLANs for which the ingress port is not a member. (Default: Disabled)

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Ingress filtering only affects tagged frames.

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If ingress filtering is disabled and a port receives frames tagged for

VLANs for which it is not a member, these frames will be flooded to

all other ports (except for those VLANs explicitly forbidden on this

port).

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If ingress filtering is enabled and a port receives frames tagged for

VLANs for which it is not a member, these frames will be discarded.

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Ingress filtering does not affect VLAN independent BPDU frames,

such as GVRP or STP. However, they do affect VLAN dependent BPDU

frames, such as GMRP.

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Membership Type – Select VLAN membership for each interface by

marking the appropriate radio button for a port or trunk:

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Tagged: Interface is a member of the VLAN. All packets

transmitted by the port will be tagged, that is, carry a tag and

therefore carry VLAN or CoS information.

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Untagged: Interface is a member of the VLAN. All packets

transmitted by the port will be untagged, that is, not carry a tag

and therefore not carry VLAN or CoS information. Note that an

interface must be assigned to at least one group as an untagged

port.

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Forbidden: Interface is forbidden from automatically joining the

VLAN via GVRP. For more information, see “Automatic VLAN

Registration” on page

199

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None: Interface is not a member of the VLAN. Packets associated

with this VLAN will not be transmitted by the interface.

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VLAN 1 is the default untagged VLAN containing all ports on the

switch, and membership type can only be modified by first assigning a port

to another VLAN and then reassigning the default port VLAN ID.

Edit Member by Interface

All parameters are the same as those described under the preceding

section for Edit Member by VLAN.

Edit Member by Interface Range

All parameters are the same as those described under the earlier section

for Modify VLAN and Member Ports, except for the items shown below.

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Port Range – Displays a list of ports. (Range: 1-26)