Cisco WS-C2960-24TC-S Software Guide - Page 46

Network Configuration Examples Chapter 1 Overview Table 1-2 Providing Network Services (continued) Network Demands Suggested Design Methods An evolving demand for IP telephony • Use QoS to prioritize applications such as IP telephony during congestion and to help control both delay and jitter within the network. • Use switches that support at least two queues per port to prioritize voice and data traffic as either high- or low-priority, based on IEEE 802.1p/Q. The switch supports at least four queues per port. • Use voice VLAN IDs (VVIDs) to provide separate VLANs for voice traffic. A growing demand for using existing infrastructure to transport data and voice from a home or office to the Internet or an intranet at higher speeds Use the Catalyst Long-Reach Ethernet (LRE) switches to provide up to 15 Mb of IP connectivity over existing infrastructure, such as existing telephone lines. Note LRE is the technology used in the Catalyst 2900 LRE XL and Catalyst 2950 LRE switches. See the documentation sets specific to these switches for LRE information. You can use the switches to create the following: • Cost-effective Gigabit-to-the-desktop for high-performance workgroups (Figure 1-1)-For high-speed access to network resources, you can use the Cisco Catalyst 2960 switches in the access layer to provide Gigabit Ethernet to the desktop. To prevent congestion, use QoS DSCP marking priorities on these switches. For high-speed IP forwarding at the distribution layer, connect the switches in the access layer to a Gigabit multilayer switch with routing capability, such as a Catalyst 3750 switch, or to a router. The first illustration is of an isolated high-performance workgroup, where the Catalyst 2960 switches are connected to Catalyst 3750 switches in the distribution layer. The second illustration is of a high-performance workgroup in a branch office, where the Catalyst 2960 switches are connected to a router in the distribution layer. Each switch in this configuration provides users with a dedicated 1-Gb/s connection to network resources. Using SFP modules also provides flexibility in media and distance options through fiber-optic connections. Figure 1-1 High-Performance Workgroup (Gigabit-to-the-Desktop) Catalyst 3750 switches Access-layer Catalyst switches 89373 1-14 Catalyst 2960 Switch Software Configuration Guide OL-8603-04