Specifications

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Cisco ATM Services (AXSM) Configuration Guide and Command Reference for MGX Switches
Release 5.2, Part Number OL-6484-01 Rev. C0, September 2005
Chapter 3 Provisioning ATM Services
Quickstart Provisioning Procedures
It is beyond the scope of this guide to describe how to configure each model of CPE to communicate
with the switch. To complete this configuration, you will need to learn the capabilities of the CPE and
the switch and define a set of communications parameters that are supported by both devices. For
example, the Cisco MGX 8850 (PXM45) switches support UNI 3.1 communications, but if the CPE does
not, you must select a signaling protocol (such as UNI 3.0) that is supported by both devices.
After all requirements have been met for SVC connections, CPE devices can establish SVC connections
to other CPE devices on the same switched network.
SPVC and SPVP Configuration Quickstart
A soft permanent virtual circuit (SPVC) is a permanent virtual circuit (PVC) that can be rerouted using
the Private Network-to-Network Interface (PNNI) Version 1.0 protocol. SPVCs are full-time
connections. Using the PNNI protocol, SPVCs can be rerouted to avoid failed communication links or
to use links that offer better bandwidth.
The difference between an SPVC and a soft permanent virtual path (SPVP) is that the SPVP supports
multiple virtual circuits, whereas a SPVC is by definition a single virtual circuit. As with SPVCs, when
an SPVP fails, PNNI can determine if an alternate route exists and reroute the connection.
The following quickstart procedure provides a summary of the tasks required to configure SPVCs and/or
SPVPs on AXSM cards. This procedure is provided as an overview and as a quick reference for those
who have previously configured these types of connections.
Command Comments
Step 1
Follow the steps in the “MPLS and
PNNI Trunk Configuration
Quickstart” section on page 3-3.
Configure the trunks that link the switches through which the ATM
end stations connect. Be sure to add the appropriate controller
(either PNNI or MPLS) on each switch and select that controller
when partitioning trunks.
Step 2
dsppnni-reachable-addr
network
On the PXM, verify connectivity between the node pairs that will
host SVCs.
See the “Verifying PNNI Communications” section on page 4-52.
Step 3
Follow the steps in the “MPLS and
PNNI UNI Port Configuration
Quickstart” section on page 3-5.
Configure UNI ports for the ATM end stations at each end of the
SVC, and assign either static or dynamic addressing to each line.
Be sure to add the appropriate controller (either PNNI or MPLS)
on each switch and select that controller when partitioning trunks.
Step 4
See the CPE documentation. Configure CPE devices for communications with the switch
through the UNI ports configured in the previous step.
Step 5
dsppncons This optional step displays the SVC connections that are
operating. Enter the dsppncons command on the active PXM.