Setting Up Virtual Path Channels (VPCs)
VPC links can only be defined for Public UNI, VOID, and AUTO interfaces, and may be of UNI, IISP, or
PNNI types.
UNI
is used to connect user devices (such as Ethernet stations).
PNNI
is used to connect switches within the same peer group, via a WAN.
IISP
is used to connect switches in different peer groups, via a WAN.
Figure 2 on page 7 shows an example of these VPC links.
Virtual path channels (VPCs) are created via the SET VPC_LINK command. See the
IBM 8265 Command
Reference Guide for details.
Traffic Shaping
Note: This function is only available on 1–port 622 Mbps and 4–port 155 Mbps modules.
When setting up a VPC, you can specify the traffic type provided by the WAN. To do this, you enter the
VPC_SERVICE_CATEGORY paramter on the SET VPC_LINK command, giving one of the following two
values:
CBR
This activates traffic shaping and the type of traffic allowed can be specified with the
VPC_SERVICE_CATEGORY parameter (see below).
UBR
Traffic shaping is inactive and only Unspecified Bit Rate (UBR) traffic is allowed through this
VPC.
When traffic shaping is active (when the parameter CBR is given to the VPC_SERVICE_CATEGORY
parameter of the SET VPC_LINK command) you can define which traffic types can be chosen by
connections established on this VPC. The possible traffic types are Available Bit Rate (ABR), Constant Bit
Rate (CBR), Unspecified Bit Rate (UBR), and Variable Bit Rate (VBR), and you can specify the following:
CBR VBR only
ABR only
UBR only
CBR VBR, and ABR
CBR VBR, and UBR
ABR and UBR
CBR VBR, ABR, and UBR.
See the
IBM 8265 Command Reference Guide for details.
48
IBM 8265: User's Guide
Summary of Contents for 8265 Nways ATM Switch
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