Cisco 2950G 24 Software Configuration Guide - Page 41
Network Demands, Suggested Design Methods, Gigabit Ethernet segment. - catalyst port switch
UPC - 746320687711
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Chapter 1 Overview Network Configuration Examples Table 1-2 Increasing Network Performance Network Demands Suggested Design Methods Too many users on a single network segment and a growing number of users accessing the Internet • Create smaller network segments so that fewer users share the bandwidth, and use VLANs and IP subnets to place the network resources in the same logical network as the users who access those resources most. • Use full-duplex operation between the switch and its connected workstations. • Increased power of new PCs, workstations, and servers • High demand from networked applications (such as e-mail with large attached files) and from bandwidth-intensive applications (such as multimedia) • Connect global resources-such as servers and routers to which network users require equal access-directly to the Fast Ethernet or Gigabit Ethernet switch ports so that they have their own Fast Ethernet or Gigabit Ethernet segment. • Use the Fast EtherChannel or Gigabit EtherChannel feature between the switch and its connected servers and routers. Bandwidth alone is not the only consideration when designing your network. As your network traffic profiles evolve, consider providing network services that can support applications such as voice and data integration and security. Table 1-3 describes some network demands and how you can meet those demands. Table 1-3 Providing Network Services Network Demands Suggested Design Methods High demand for multimedia support • Use IGMP and MVR to efficiently forward multicast traffic. High demand for protecting mission-critical applications • Use VLANs and protected ports to provide security and port isolation. • Use VLAN trunks, cross-stack UplinkFast, and BackboneFast for traffic-load balancing on the uplink ports so that the uplink port with a lower relative port cost is selected to carry the VLAN traffic. 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 802.1P/Q. 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 2950 LRE switches to provide up to 15 Mb of IP connectivity over existing infrastructure (existing telephone lines). Figure 1-1 shows configuration examples of using the Catalyst switches to create these networks: • Cost-effective wiring closet-A cost-effective way to connect many users to the wiring closet is to connect up to nine Catalyst 2900 XL, Catalyst 2950, Catalyst 3500 XL, and Catalyst 3550 switches through GigaStack GBIC connections. When you use a stack of Catalyst 2950G-48 switches, you can connect up to 432 users. To preserve switch connectivity if one switch in the stack fails, connect the bottom switch to the top switch to create a GigaStack loopback, and enable cross-stack UplinkFast on the cross-stack Gigabit uplinks. 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 1-9