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Layer 3 Switching Software Feature and Configuration Guide
78-6235-04, Cisco IOS Release 12.0(10)W5(18)
Chapter 4 Configuring Interfaces
Configuring the ATM Uplink Interface (Catalyst 8540)
Configuring CDP
The ATM uplink interface is configured by default with Cisco Discovery Protocol (CDP) disabled. To
enable CDP, use the cdp enable command in interface configuration mode.
Configuring the Maximum VCs per VP
The ATM uplink interface is configured by default to allow a maximum of 1024 VCs per VP. To change
this value, perform the following steps, beginning in global configuration mode:
Configuring Virtual Circuits
A virtual circuit is a point-to-point connection between the switch router and a remote system. A virtual
circuit is established for each ATM end node with which the router communicates. The characteristics
of the virtual circuit are established when the virtual circuit is created and include the following:
• Virtual circuit descriptor (VCD), associated with a VPI/VCI paid
• Encapsulation type
• Peak, average, and burst transmission rates
To configure a PVC, you must complete the following tasks:
• Create a PVC
• Map a protocol address to a PVC
Creating a PVC
When you create a PVC, you specify a virtual circuit descriptor (VCD) and associate it with the
VPI/VCI pair.The number chosen from the VCD is independent of the VPI/VCI used. When you create
a PVC, you also specify the AAL and encapsulation type and traffic parameters. Traffic parameters
include peak and average rate, specified in kilobits per second, and burst rate, specified in cells.
Omitting a peak and average value causes the PVC to be connected at the highest bandwidth rate
available. In that case, the peak and average values are equal.
Command Purpose
Step 1
Router(config)# interface atm
slot/subslot/interface
Router(config-if)#
Enters interface configuration mode and specifies the ATM
interface to configure.
Step 2
Router(config-if)# atm vc-per-vp
num-vcs
Configures the maximum number of VCs per VP to 16, 32, 64,
128, 256, 512, 1024, 2048, 4096, or 8192.
Step 3
Router(config-if)# no shutdown Enables the interface with the previous configuration.