Allied Telesis AT-iMG634 - R2 User's Guide Page 807

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Basic bridge configuration Bridge
8-37
iMG/RG Software Reference Manual (ADSL Port)
FIGURE 8-2 Basic software bridge configuration
The bridge software and the overall system architecture has been designed in order to have frames forwarded
by the bridge always being tagged frames. All the bridge interfaces must therefore be able to manage tagged
frames.
The bridge software has two interfaces named defaulti and qinterface respectively.
The defaulti interface receives always tagged frames from the switch chipset that is configured to support multi-
ple vlan on the Ethernet ports and manage tagged/untagged frames. The defaulti interface forwards tagged
frames either to the bridge qinterface or to other configured bridge interfaces based on the destination MAC
address (see below).
The Allied Telesis Media Gateway is always configured with one ip interface ip0 attached (connection b) on an
Ethernet transport named t1.
The transport t1 add a tag header with VID = 1 to all the outgoing packets routed or generated by ip0 interface.
These packets arriving on the bridge interface qinterface will be forwarded to the other bridge interfaces
depending on the destination MAC address registered in the bridge database: if the bridge has previously regis-
tered the destination MAC address as belong to a specific interface, the packet will be forwarded only to this
interface, otherwise the packet is forwarded to all the existing interfaces.
qinterface
Bridge Software
L2 switch
bunbridge
dynamic
VID 1 (tagged) a
VID 1 (untagged)
b
t1
ip0
defaulti
VID 1 (tagged)
c VID 1 (tagged)
default
cpu
lan1 lan2 lan3 lan4
ethernet0
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