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Ethernet Bridge and VLANs
4.6
Dynamic VLAN Membership
Introduction
The basic idea of the dynamic VLAN (dynVLAN) membership feature is to assign VLANs to specific MAC
addresses rather than to bridge ports. When a device with such a MAC address is connected to a bridge port,
that port is dynamically added to the correct VLAN.
The dynVLAN membership feature uses two tables:
DynVLAN membership
List of active
The CLI commands explained in this section belong to the command group
General configuration of the bridge
Before using the dynVLAN membership feature, make following preparations:
VLAN awareness of the
Hence, the bridge should be VLAN aware.
By default, the bridge is non-VLAN aware. To make the bridge VLAN aware, execute following command:
=>:eth bridge config vlan=enabled
For more information on VLAN awareness, see
VLANs on the
in addition to the default VLAN:
=>:eth vlan add name=data vid=2
=>:eth vlan list
Vid
---
1
2
DynVLAN membership checking
DynVLAN membership checking can be enabled per bridge port using the command
:eth bridge ifconfig
If this parameter is enabled, the bridge port:
Checks the source MAC address of an incoming frame,
Looks for an entry for that MAC address in the dynVLAN membership table,
Updates the list of active entries if the MAC address was found in the dynVLAN membership table: it
creates an entry or refreshes an existing entry.
22
table: this table contains the mapping between MAC addresses and VLANs.
entries: this table also contains information on the used bridge port.
bridge: extra VLANs will be created in addition to the default VLAN on the bridge.
bridge: as MAC addresses are assigned to VLANs, at least one new VLAN must be created
Name
----
default
data
and the parameter
"4.3 VLAN Awareness" on page 16
dynvlan
.
:eth bridge dynvlan
E-DOC-CTC-20080229-0001 v1.0
.
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