Brocade Network OS Administrator’s Guide v4.1.1 User Manual

Page 356

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Any tagged frames coming with a VLAN tag equal to the configured native VLAN are
processed.

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For ingress and egress, non-native VLAN tagged frames are processed according to the
allowed VLAN user specifications. This is called trunk mode.

NOTE
Ingress VLAN filtering is enabled by default on all Layer 2 interfaces. This ensures that VLANs are
filtered on the incoming port (depending on the user configuration).

The following illustrates the frame-processing logic for an incoming frame.

FIGURE 43 Ingress VLAN filtering

There are important facts you should know about Ingress VLAN filtering:

• Ingress VLAN filtering is based on port VLAN membership.
• Port VLAN membership is configured through the Network OS CLI.
• Dynamic VLAN registration is not supported.
• The Brocade VDX hardware does VLAN filtering at both the ingress and egress ports.

Configuring 802.1Q VLANs

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Network OS Administrator’s Guide

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