Cisco Systems 8540 appendix Configuring Virtual Circuits, Configuring CDP, Creating a PVC, Num-vcs

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:

	Command	Purpose
Step 1
	Router(config)# interface atm	Enters interface configuration mode and specifies the ATM
	slot/subslot/interface	interface to configure.
	Router(config-if)#
Step 2
	Router(config-if)# atm vc-per-vp	Configures the maximum number of VCs per VP to 16, 32, 64,
	num-vcs	128, 256, 512, 1024, 2048, 4096, or 8192.
Step 3
	Router(config-if)# no shutdown	Enables the interface with the previous configuration.

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.

	Layer 3 Switching Software Feature and Configuration Guide
4-34	78-6235-04, Cisco IOS Release 12.0(10)W5(18)