Chapter 3
Technical Overview
SmartSwitch Architecture
The SmartSwitch Architecture of the 9H532-24, 9H533-24, 9H531-24 and 9H539-24 modules, as shown in Figure 3-1,are conÞgurable for one of two modes of operation: traditional IEEE 802.1 switching, or SecureFast switching. The modules support only one of these modes of operation at any one time.
When operating in traditional IEEE 802.1 switch mode, the 9H532-24, 9H533-24, 9H531-24 and 9H539-24 make Þltering/forwarding decisions based on Destination Address (DA), with standard IEEE 802.1D learning. 802.1Q VLANs are also supported.
Spanning tree operation for the 9H532-24, 9H533-24, 9H531-24 and 9H539-24 may be conÞgured to adhere to IEEE 802.1D, DEC, or none. The default Spanning Tree Algorithm is 802.1D.
When operating in SecureFast switch mode, all Þltering/forwarding decisions are made on a DA-SA pair and its in and out port on a connection-orientated basis. SecureFast switching mode provides value-added network services including dynamic VLANs, Topology, Connectivity, IP Multicast, Control, Security, Application, Address Management, Dynamic Mapping, and Directory services. For example, Topology Services includes conÞgurable options ranging from simple spanning tree implementations to fully-meshed active topologies. Other services and features supported in SecureFast switching mode are described in detail in the Cabletron SystemÕs White Paper, IP Host Communication in Bridged, Routed and SecureFast Networks.
