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Dual-mode vlan ports – Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual

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Dual-mode VLAN ports

Configuring a tagged port as a dual-mode port allows it to accept and transmit both tagged traffic and
untagged traffic at the same time. A dual-mode port accepts and transmits frames belonging to VLANs
configured for the port, as well as frames belonging to the default VLAN (that is, untagged traffic).

For example, in the following figure, port 2/11 is a dual-mode port belonging to VLAN 20. Traffic for
VLAN 20, as well as traffic for the default VLAN, flows from a hub to this port. The dual-mode feature
allows traffic for VLAN 20 and untagged traffic to go through the port at the same time.

Dual-mode VLAN ports

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FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide

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