3Com REMOTE ACCESS SYSTEM 1500, Management Manual

Page: 115 / 300

Enabling Bridging Over the LAN
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If the bridge does not find the destination hardware address in its
bridging table, the RAS 1500 transmits the frame across the bridge.
If the bridge finds the destination hardware address in its bridging table,
the RAS 1500 transmits the packet across bridge links.
Bridging Tips The following sections provide tips to help you understand bridging with
the RAS 1500.
Configuring PPP
To configure a bridge, you need to configure a bridge network, a user,
and add Point to Point Protocol (PPP) support for that user.
Enabling Bridging
The RAS 1500 specifies a protocol to bridge by disabling routing for that
protocol. (Routing by default takes precedence over bridging.)
Enabling Bridging
Over the LAN
Use the following steps to enable bridging over the local area network
(LAN):
1 Create a user. Use the following command:
add user <name> password <password> type network, dial_out
Example:
add user Boston password sayhey type network, dialout
2 Create a bridge network. Parameters for interface are optional because
the RAS 1500 will choose the first LAN (rm0/eth:1) it finds in your system.
The enable value is selected by default. Use the following command:
add bridge network <name> user <name>
Example:
add bridge network corporatenet user boston
To verify bridge settings, use
show bridge network settings
.
3 Configure network protocols you intend to bridge by editing the earlier
created user profile. Because the RAS 1500 defaults to routing, if you
want to bridge a particular protocol, disable routing for it. (Internet
Protocol [IP], Internetwork Packet Exchange [IPX], AppleTalk, and bridging
are enabled by default.)