Network Design Guidelines

Some common network designs are suboptimal in terms of performance; most of these are based on media mismatch as illustrated in Figure 5-12.

This scenario shows two separate cases of common media mismatch problems. The first problem is between Router B and Router C where multiple clients are trying to access a centralized server farm. What may not be obvious at first glance is that the 56-Kbps line is the primary connection between the clients and the servers, and it will quickly become oversubscribed with traffic. At the very least, enough bandwidth to support the maximum expected peak traffic between the clients and servers should be in place. Or, if certain Ethernet segments make extensive use of a particular server, distributing servers to local Ethernet segments will greatly improve network performance.

The second performance problem is through Router A, where the server farm gets backed up to a network of backup servers. The media mismatch from 100 Mbps FDDI to 10 Mbps Ethernet is the bottleneck. To gain optimal performance for high-speed backups going through the router, the media speeds should be maximized.

Figure 5-12 Media Mismatch

Host Host

Figure 5-12 Media Mismatch

Host Host

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