By David Barnes, Basir Sakandar
Local-area networks (LANs) have gotten more and more congested and overburdened due to a dramatic bring up in site visitors, speedier CPUs and working structures, and extra network-intensive functions. Many enterprises that use community and computing expertise use LAN switching to exploit high-speed site visitors forwarding and more advantageous functionality of conventional Ethernet applied sciences that do not require expensive wiring improvements or time-consuming host reconfiguration. "Cisco LAN Switching basics" offers directors of campus networks with the main updated advent to LAN switching inside a conventional Ethernet surroundings.
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Additional info for Cisco LAN switching fundamentals
Catalyst Switching Architectures This chapter covers the following topics: • Catalyst 5000/5500 (Project Synergy) • Catalyst 6000/6500 (Constellation, Constellation+, and Constellation II) • Catalyst 4500 (Galaxy 3 and 4) Components and Architecture • Catalyst 3750 (Lord of the Rings) Components and Architecture • Comparing the architectures Chapter 3 introduces the architectures behind Cisco LAN switching, ranging from the first Catalyst switches to the most recent introductions from Cisco into the switching market.
Cisco offers both non-blocking and blocking configurations on various platforms, depending on bandwidth requirements. Check the specifications of each platform and the available line cards to determine the aggregate bandwidth of the connection into the switch fabric. < Day Day Up > < Day Day Up > Congestion and Head-of-Line Blocking Head-of-line blocking occurs whenever traffic waiting to be transmitted prevents or blocks traffic destined elsewhere from being transmitted. Head-of-line blocking occurs most often when multiple high-speed data sources are sending to the same destination.
In Figure 2-7, a congestion scenario is created using a traffic generator. Port 1 on the traffic generator is connected to Port 1 on the switch, generating traffic at a 50 percent rate, destined for both Ports 3 and 4. Port 2 on the traffic generator is connected to Port 2 on the switch, generating traffic at a 100 percent rate, destined for only Port 4. This situation creates congestion for traffic destined to be forwarded by Port 4 on the switch because traffic equal to 150 percent of the forwarding capabilities of that port is being sent.
Cisco LAN switching fundamentals by David Barnes, Basir Sakandar