3Com 9000 manual Mechanisms for Handling Congestion, Classical IP Clip ATM, Virtual Networks

CoreBuilder 9000 ATM Enterprise Switch Characteristics 29

Mechanisms for Handling Congestion

The following mechanisms are used to manage congestion in the

CoreBuilder 9000 ATM Enterprise Switch Fabric Module:

Back Pressure

Partial Packet Drop (PPD) (Hardware ready)

Early Packet Drop (EPD) (Hardware ready)

￿Call Admission CLP-based Cell Discard.

ATM Networks The CoreBuilder 9000 ATM Enterprise Switch supports the following types of ATM networks:

Classical IP (CLIP) ATM

The CoreBuilder 9000 ATM Enterprise Switch is transparent to CLIP and allows you to use CLIP over the ATM network. For a view of the CoreBuilder 9000 ATM Enterprise Switch when CLIP is used over ATM within a network, see Chapter 3, ATM Network Basics in the Operations Guide.

Virtual Networks

The CoreBuilder 9000 ATM Enterprise Switch handles virtual networks across the enterprise using ATM and LAN Emulation (LANE). Segments in a virtual network can incorporate legacy LANs and ATM devices using LANE, allowing you to organize network users into logical groups, regardless of their physical location. Using this feature, you can set up workgroups comprised of members from various departments or business units around the enterprise, and centralize servers into server farms for better administration. For more information about virtual networks, see Chapter 3, ATM Network Basics in the Operations Guide.