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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 24 Configuring BXM Virtual Trunks
Command Overview
The Constant Bit Rate (Cbr), Variable Bit Rate (Vbr), and Available Bit Rate (Abr) parameters must
also correspond to the Virtual Trunk Type of the virtual trunk. For T3, set PCR to the bandwidth of the
virtual trunk, and CDVT to 24000 for the connection so that the card does not drop cells. These are
values that Cisco recommends based on testing.
Step 3 Configure the Broadband Network Interface (BNI) virtual trunks. On the BNIs that connect to the cloud
ports, configure up to 32 virtual trunks:
uptrk <slot.port.vtrk>
cnftrk <slot.port.vtrk>
For cnftrk, make sure that the virtual trunk type and the VPI correspond to the Virtual Path connections
that have been set up.
addtrk <slot.port.vtrk>
Command Overview
The command summarized here are specific to virtual trunk usage on the BPX, using the BXM cards.
For complete information about each these commands, refer to the Cisco WAN Switching Command
Reference and Cisco WAN Switch SuperUser Command Reference.
For information about the UXM, refer to the IGX 8400 Series documents. Also, refer to the Cisco WAN
Manager documents for application information using a graphical user interface for implementing
command functions.
Primary Configuration Commands
The primary commands used for configuration of virtual trunks are:
• cnftrk
Configure trunk
• cnfrsrc
Configure conids (lcns) and bandwidth
• cnftrkparm
Configure trunk parameters
Configuration using cnftrk
The main parameters for cnftrk are:
• transmit trunk rate
• trunk VPI
• Virtual Trunk Type
• Connection Channels
• Valid Traffic Classes.
The VPI configured for a virtual trunk must match the VPI of the VPC in the public ATM cloud. Every
cell transmitted to the virtual trunk has this VPI value. Valid VPC VPIs depend on the port type as
showninTable24-7