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Performance and Fault Management by James M. Thompson, Kent J. Phelps, Robert L. Pavone, Christopher E. Elliott, Paul L. Della Maggiora

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Overview of VLAN Characteristics

Before diving into the details of performance and fault management for VLANs, we define some of the relevant terms and features of the technology. We'll look specifically at the following:

  • Logical ports versus physical ports

  • VLAN trunking

  • Spanning tree as it applies to VLANs

This is not an exhaustive discussion regarding VLANs, just a brief overview. For more details regarding VLAN architecture, refer to the documentation on CCO or some of the specific references cited at the end of this chapter.

Logical Versus Physical Ports

One of the main reasons for lack of system resources on Catalyst Series switches is the presence of too many logical ports configured or allowed on the switch. Each VLAN instance configured ...

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