Beta Draft Confidential
3-261/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring CBX or GX Logical Ports
Setting Logical Port Attributes
Configuring VCC VPI Start and Stop Values for Virtual UNI
The CBX 500 and GX 550 switches provide a virtual UNI feature. The direct UNI
provides the range of VCC VPI start and stop values (see “Configuring the VPI” on
page 3-25). The range of VPI start and stop values you define for the first virtual UNI
must fall within this range; it cannot overlap with the range you define for subsequent
virtual UNI ports.
For example:
The switch handles SVCs differently, depending on how you configure the
Connection Type field of the virtual UNI (see Table 3-4 on page 3-29). If the logical
port is set to the Network <-> Network Connection Type, it implies a network scenario
as shown in Figure 2-1 on page 2-11. In this case, the first VPI is used for VCCs only.
Additional VPIs can only be used for signaled VPCs with the best effort QoS. If the
logical port is set to the Network <=> Endsystem Connection Type, it implies a
network scenario as shown in Figure 2-2 on page 2-12. In this case, all available VPIs
can be used for either signaled VCCs or VPCs of any QoS class.
The restrictions described above only apply to SVCs. When using virtual UNIs in
conjunction with PVCs, there are no restrictions and the Connection Type field on the
logical port is not used.
Enabling the VP Shaping Option
When you set Administrative Attributes for the virtual UNI logical port, verify that the
VP Shaping option is enabled (see VP Shaping on page 3-21). For additional
information on VP shaping rates used by the FCP, see “Shaping Rates” on page 5-20.
Logical Port VPI Start VPI Stop
First Virtual UNI 2 5
Second Virtual UNI 6 10
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