
Sample ATM Network
D-5
Understanding the Control Software
The sample ATM network consists of various control software components. Each
of these components provides a necessary function within the ATM network.
Role of the CMS
The ATM CMS software provides connection services within the ATM network.
Functions of the CMS include
• Managing call setup, maintenance, and clearing within a switch domain
• Negotiating network resources, a network path, and bandwidth prior to
sending ATM traffic
• Ensuring that the required network resources, network path, and minimum
bandwidth exist prior to sending ATM traffic
• Automatically sending calls along available paths and, in the event of a
network fault, rerouting any new calls
• Collecting, combining, and filtering network management information before
sending it to the ATM network management application (NMA) software
• Providing a central boot server location for a switch and other devices within
the network
• Supporting ILMI, signaling (Q.2931 and Q.SAAL), Quality of Service (QoS),
and Connection Admission Control (CAC) traffic management services as
defined within the ATM Forum UNI Specification Version 3.0
Role of the MCS
The multicast server (MCS) software allows LAN emulation (LANE) services to
operate over an ATM network. The MCS software provides the following LANE
services:
• Virtual LAN definition and management
• MAC address-to-ATM address resolution for attached LANE clients
• Broadcast and multicast support for attached LANE clients
For additional information about the MCS or LANE, refer to Appendix B.
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