Parallel Backbones

In some of the cases where collapsed backbones are untenable, a modified version may prove ideal. This modification is known as the parallel backbone. The reasons for installing a parallel backbone are many. User communities may be widely dispersed throughout a building; some groups and/or applications may have stringent network security requirements; or high network availability may be required. Regardless of the reason, running parallel connections from a building's collapsed backbone router to the same telephone closet enables supporting multiple segments to be run from each closet, as shown in Figure 3-15.

Figure 3-15: An example of parallel backbone topology.

Figure 3-15: An example of parallel backbone topology.

The parallel backbone topology is a modification of the collapsed backbone. Much like the collapsed backbone, this backbone topology can create multiple media access and MAC broadcast domains. The key distinction is that this topology can achieve a finer degree of segmentation than a collapsed backbone can provide.

This approach marginally increases the cost of the network, but can increase the performance of each segment and satisfy additional network criteria, such as security and fault tolerance.

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