LAN Switching and Wireless, CCNA Exploration Companion Guide (Genesis Bungque Singson's Library) by Wayne Lewis

Author:Wayne Lewis
Language: eng
Format: epub, mobi
Publisher: Cisco Press
Published: 2008-07-14T16:00:00+00:00

Figure 5-5. Access-Distribution Path Failure

If the link between switch D1 and switch C2 is disrupted, as shown in Figure 5-6, data from PC1 destined for PC4 is prevented from reaching switch C2 on its original path. However, because switch D1 has a second path to PC4 through switch C1, the path is updated and the data is able to reach PC4.

If switch D1 fails, as shown in Figure 5-7, data from PC1 destined for PC4 is prevented from reaching switch C2 on its original path. However, because switch S1 has a second path to PC4 through switch D2, the path is updated and the data is able to reach PC4.

If switch C2 fails, as shown in Figure 5-8, the data from PC1 destined for PC4 is prevented from reaching switch D4 on its original path. However, because switch D1 has a second path to PC4 through switch C1, the path is updated and the data is able to reach PC4.

Redundancy provides flexibility in path selection on a network, allowing data to be transmitted regardless of a single path or device failing in the distribution or core layers. Redundancy does have some complications that need to be addressed before it can be safely deployed on a hierarchical network.

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