Lucent Technologies 6000 - Manual (Page 523)

Configuring Packet Bridging
Establishing a bridged connection
MAX 6000/3000 Network Configuration Guide 14-3
Address Resolution Protocol (ARP) broadcast packets that contain an IP address specified in
the bridge table are a special case. For details, see “Configuring proxy mode on the MAX” on
page 14-16. (ARP is a protocol that maps an IP address to a physical hardware address, thus
enabling a unit to identify hosts on an Ethernet LAN.)
Establishing a bridged connection
A MAX unit uses station names and passwords to establish a bridging connection, as shown in
Figure 14-1.
Figure 14-1. Negotiating a bridge connection (PPP encapsulation)
Note: The information exchange illustrated in Figure 14-1 differs slightly for Combinet
bridging, in which the bridges’ MAC addresses are exchanged instead of station names, and
passwords can be configured as optional. Otherwise, the way in which the unit establishes a
Combinet bridge connection across the WAN is very similar to the PPP bridged connection in
Figure 14-1. For more information about Combinet, see Chapter 4, “Configuring Individual
WAN Connections.”
The system name assigned to the unit by the Name parameter in the System > Sys Config
profile must exactly match the device name specified in the Connection profile on the remote
bridge, including case changes. Similarly, the name setting in the remote bridge’s Sys Config
profile must exactly match the name specified by the Station parameter in the Connection
profile on the local unit, including case changes.
Note: The most common cause of trouble when initially setting up a PPP bridging connection
is specifying the wrong name for the MAX unit or the remote device. Errors often include not
specifying case changes or not entering a dash, space, or underscore.
Enabling bridging
A MAX unit has a systemwide Bridging parameter that you must enable for any bridging
connection to work. The Bridging parameter directs the unit’s Ethernet controller to run in
promiscuous mode. In promiscuous mode, the Ethernet driver accepts all packets, regardless of
address or packet type, and passes them up the protocol stack for a higher-layer decision on
whether to route, bridge, or reject the packets. (Even if no packets are actually bridged, running
WAN
Ethernet
MAX
MAX
Site B Site A
Name=sitagw
Remote station=sitbgw
Send PW=*noknok*
Recv PW=*comein*
Bridging=yes
Ethernet
Name=sitbgw
Remote station=sitagw
Send PW=*comein*
Recv PW=*noknok*
Bridging=yes