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Tables Used in Switching: This section explains how tables of information and computation are used to make switching decisions. Coverage focuses on the content-addressable memory table involved in Layer 2 forwarding, and the ternary content-addressable memory used in packet-handling decisions at Layers 2 through 4. ■ Managing Switching Tables: This section reviews the Catalyst commands that you can use to configure and monitor the switching tables and memory. You will find these commands useful when troubleshooting or tracing the sources of data or problems in a switched network.
Core Size in a Campus Network The core layer is made up of redundant switches and is bounded and isolated by Layer 3 devices. Routing protocols determine paths and maintain the core’s operation. As with any network, you must pay some attention to the overall design of the routers and routing protocols in the network. Because routing protocols propagate updates throughout the network, network topologies might be undergoing change. The network’s size (the number of routers) then affects routing protocol performance as updates are exchanged and network convergence takes place.
At the distribution and core boundary, each distribution switch connects to only two core switches over Layer 3 switch interfaces. Therefore, only pairs of router peers are formed. When multilayer switches are used in the distribution and core layers, the routing protocols running in both layers regard each pair of redundant links between layers as equalcost paths. Traffic is routed across both links in a load-sharing fashion, utilizing the bandwidth of both. One final core layer design point is to scale the core switches to match the incoming load.