Beta Draft Confidential
Configuring ATM PVCs
GX 550 VC Provisioning Guidelines
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0510-3
Keep in mind the following considerations when provisioning VCCs and VPCs on the
GX 550 switch:
• When you provision VCCs on a logical port and choose a VPI that is not currently
in use on that logical port, a 1K block of connection entry resource is reserved for
that VPI on that particular logical port (that is, VCIs 0-1023 are reserved for this
VPI; VCIs 32 – 1023 are usable for PVC establishment). The size of the block
reserved depends on the logical port VPI/VCI bit setting. The 1K block size
applies if the default VPI/VCI bit setting of VPI bits = 4 and VCI bits = 10 is used.
This means that if you provision VCCs of VPI/VCI = 1/100, 2/100, 3/100, and
4/100 on a particular logical port, you would reserve 4K of connection entry
resources just for those 4 VCCs. If you provision the VCCs with a VPI/VCI of
1/100, 1/101, 1/102, and 1/103 instead, you would reserve only the 1K block
needed for VPI =1.
Connection entry resources are reserved for each VCC VPI on a per-port basis.
This means that if you configure a phy card with port 1 having a VCC using a
VPI/VCI of 1/100 and port 2 also having a VCC with a VPI/VCI of 1/100, you
reserve 1K for each of the ports (meaning 2K is consumed in total).
• When you provision VPCs on a logical port, the switch uses a different connection
entry resource reservation process. For the first VPI associated with a VPC, 64
connection entries are reserved. Subsequent VPCs on the same phy card consume
the remaining 63 connection entries. Once you provision 64 VPCs on the phy
card, adding one more VPC reserves another 64 connection entries.
When you provision VPCs, you still have the ability to use the full VCI range of
0-65535 within the VPC for VCCs. The connection entry reservation process does
not limit the quantity of VCCs within the VPC.
The
show ckt slot.port console command provides details on the connection
entry allocation for VCCs and VPCs on a per slot and per port basis. See the
Console Command User’s Reference Guide for CBX 3500, CBX 500, GX 550, and
B-STDX 9000 for more information.
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