O'Reilly logo

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

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 15. Monitoring VLANs

The concept of a “virtual” LAN or VLAN is essentially that of an isolated broadcast domain that exists in LAN-switched environments. Ports sharing the same VLAN can switch packets between them at Layer 2 of the OSI stack. You can also think of a VLAN as an individual IP subnet. Cisco CCO describes the functions of VLANs as follows:

VLANs enable efficient traffic separation, provide better bandwidth utilization, and alleviate scaling issues by logically segmenting the physical local-area network (LAN) infrastructure into different subnets so that packets are switched only between ports within the same VLAN. When combined with central configuration management support, VLANs facilitate workgroups and client/server additions ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required