Beta Draft Confidential
Configuring CBX or GX Logical Ports
Setting Logical Port Attributes
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/053-29
Table 3-4. Add Logical Port: ATM Tab Fields
Field Logical Port Action/Description
Connection:
Class
UNI
DCE/DTE,
NNI, or
ATMoMPLS
UNI/NNI
Displays the logical port connection type, either Direct or
Virtual. This field is set to Direct when you configure the
first UNI/NNI logical port on this physical port. When you
configure subsequent UNI/NNI ports on this physical port,
this field is set to “Virtual”.
For Trunk logical port types, this field defaults to Direct
and cannot be changed.
Connection:
Type
UNI DCE Displays whether this port connects to another switch or
endsystem, or to a router or host.
This option lets the switch know whether or not to send a
configured node prefix over the ILMI channel to the
attached device. This setting has no effect if ILMI is not
enabled, or ILMI is enabled but you will not use ILMI
address registration.
Network <-> Endsystem – Port connects to a router or host
(UNI-DCE ports only). If this port connects to a customer
premise equipment (CPE) device a compliant configured
node prefix will be sent over the ILMI channel to the device
for ILMI address registration.
Network <-> Network – Port connects to another switch or
an end system. If this port connects to another network
switch, the node prefix should not be sent over the ILMI
channel to the attached device.
The defaults are:
•DCE – Network <-> Endsystem
• DTE/NNI – Network <-> Network
Valid Bits:
VPI
UNI
DCE/DTE
and NNI
Specify a value that is within the valid range for either the
NNI or UNI call header format. See page 2-13 for details.
The default value is 4.
For virtual logical ports, this field is read-only.
Note: If you are using the 3-port Channelized DS3/1 IMA
or 1-port Channelized STM-1/E1 IMA module on CBX 500
or CBX 3500 configured in UNI mode, the default value for
Number of Valid Bits in VPI is 8, based on an SVC
Connection ID Range of 0 (zero) to 255. When the 3-port
Channelized DS3/1 IMA module is configured in Inverse
Multiplexing for ATM (IMA) mode, the standard ATM
default value is used.
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