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 1/19/053-25
Configuring VP Shaping on CBX 500 Virtual UNI Logical Ports
This section describes how to configure the VP shaping feature on virtual ATM UNI
logical ports on CBX 500 switches. For more information, see “About VP Shaping on
the CBX 500 and CBX 3500” on page 2-20.
Before You Begin
Before you configure VP shaping on a virtual ATM UNI logical port, verify that you
have completed the following tasks:
• Enabled the ATM FCP on a supported CBX 500 module. See “Enabling the FCP”
on page 6-2 for more information on configuring the FCP attributes on an IOM.
• Configured an ATM UNI DCE or NNI logical port with a minimum amount of
bandwidth; this logical port acts as the feeder port. When used as a feeder port,
you can still use the ATM UNI CE or NNI logical port for PVC and SVC
applications, providing enough bandwidth has been assigned to the feeder port.
Virtual ATM UNI Logical Port Configuration Considerations
To configure a virtual ATM UNI logical port, see “Configuring Virtual ATM UNI/NNI
Logical Ports” on page 3-58. In addition, be aware of the special considerations
described in the following sections.
Configuring the VPI
The VPI is the identifier used for all VCC circuits routed over the virtual UNI. The
range of valid VPI values depends upon the number of valid VPI bits you set for the
ATM UNI feeder port (see Table 2-3 on page 2-14). Enter a number from zero
(0)-nnnn to identify the VP for the ATM logical port; nnnn is equal to 2
P
-1, where P is
the value specified in the Valid Bits in VPI field for the UNI feeder port that shares
this physical port (see the example on page 2-13).
For example, if you entered 4 in the Valid Bits in VPI field for the UNI feeder port,
you can have up to 15 VPs on this port (2
4
-1=15); if you entered 8 in the Valid Bits in
VPI field, you can have up to 255 virtual paths on this port (2
8
-1=255). The highest
value you can enter (and therefore, the greatest number of virtual paths you can
configure on the port) depends on the value you entered in the Valid Bits in VPI field
for the ATM UNI feeder port. The virtual UNI’s VPI must be unique to the port.
To Next Page
Loading...
Need help?
General
