3Com ADSL Modem Ethernet - Manual (Page 18)

3-2 C HAPTER 3: M ANUAL SETUP
You modify the profile using set port commands to setup the WAN connection
and network information.
Remember to save your configuration using the save all command before
rebooting your 3Com HomeConnect ADSL Modem Ethernet so that your changes
will be written to permanent FLASH memory.
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You can obtain a list of all currently configured port profiles using the
command:
list ports
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You can view the contents of a particular profile using the command:
show port <port_number>
The 3Com HomeConnect ADSL Modem Ethernet always has a default profile.
Any value that is not set in a profile that you create will assume the values that are
present in the default profile.
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You can view the default profile using the command:
show port default
Bridge port profiles can be enabled or disabled. When a port is enabled using the
enable port command, the 3Com HomeConnect ADSL Modem Ethernet reads the
connection parameters for the port from the profile and establishes a connection.
When a port is disabled using the disable port command, the connection will be
terminated and no other data will be directed out the bridge port. Configuration
changes to a bridge port profile do not take effect until the next time the profile is
enabled. Thus, if you want to make changes to the profile you should disable the
profile, make your changes, and then re-enable the profile.
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For example, if you want to change the VCI value to 35 for bridge port 2:
disable port 2
set port 2 vci 35
enable port 2
Configuring ATM
Information
The 3Com HomeConnect ADSL Modem Ethernet bridges packets over ATM virtual
circuits. ATM allows for permanent connections (PVCs) and switched connections
(SVCs). Each PVC is identified by its Virtual Path and Connection Identifiers
(VPI/VCI). The VPI/VCI uniquely specifies a path to a remote site and is placed in
the ATM cell header that is used to route each cell through the network.
Two ports with the same VPI and VCI can not be enabled simultaneously. You
should disable all ports that use the same VPI/VCI and then enable the one that
should be active.
For SVCs, there is not a fixed VPI/VCI. Instead, a destination address is used to set
up a path through the ATM backbone network when the connection is to be
established.
Currently, the SVC capability is disabled in the 3Com HomeConnect ADSL Modem
Ethernet. The VPI/VCI values to use for a bridge port are specified using the ’set
port’ command:
set port <port_number> vci <vci_value> vpi <vpi_value>