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Configuring Bridge/Router AutoSense (BRAS) Mode
In Bridge-Router AutoSense (BRAS) mode, the Ethernet Modem
Router chooses at startup whether to operate in Routing and
Bridging mode or in Bridging-only mode, based on information it
learns while communicating with the LAN PCs. This capability
allows units to be delivered to customers with one preconfiguration
for both deployment types.
If BRAS is to be used, the modem must be preconfigured with both
PPPoE and EoA interfaces, and bridging must be enabled. When
the modem is booted up with BRAS enabled, the mode is
determined as follows:
1. The modem comes up with both bridging and routing
enabled, with its own internal PPPoE client active.
2. If the modem subsequently detects PPPoE traffic from the
LAN PC's PPPoE client (indicating a bridge deployment),
then the modem automatically switches to bridging mode by
stopping its own PPPoE client, causing PPPoE packets to
be bridged from the LAN side.
3. Otherwise (no PPPoE traffic is detected) the modem
continues to operate as before in bridging mode (non-
PPPoE traffic) as well as routing mode.
Follow these instructions to enable Bridge-Router AutoSense:
1. Ensure that both a PPPoE and an EoA interface is
established and that the EoA interface has been made
bridgeable (see "Making Interfaces Bridgeable (Bridge-
Enabled)" on page 79).
2. Click the Home tab to display the Home page, then select
System Mode in the task bar.
3. Ensure that the Bridging: Enabled radio button is selected.
4. Click the BRAS: Enabled radio button, and then click
.
A page displays briefly to confirm the change, and the System
Mode page redisplays.
5. If you want the changes to be permanent, follow the
instructions on page 46 to commit them.
Enabling or disabling BRAS takes effect immediately; i.e., a system
reboot is not required.
Chapter 6. Configuring the System Operating Modes
85
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