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ccna exam in nepal.14.3.1 Introduction to Switch StackingCisco StackWise technology can provide an innovative approach to utilizing the capabilities of a group of switches in a unified manner. Individual switches can be intelligently combined together to create a single switching unit, a technique called stacking. Stackable configurations of switches can be interconnected using dedicated cables that provide large bandwidth throughput capabilities between switches, and the stacked switches can operate effectively as one larger switch. For example, the CiscoCatalyst3750 Series uses StackWise technology to provide a 32Gbps stacked interconnect using backplane stacking; Cisco's newer model, the Switch 3650, can provide a 160Gbps stacked interconnect connecting up to nine switches. Switch stacking connections are shown in Figure 14.9, which shows stacking cables daisy-chaining switches to stack one switch onto another. The switches are logically the same device when they are stacked. If you want to set up these switches, just connect to any of the.226.Cisco Networking Lab CCNA Lab Guide (2nd Edition)Figure 14-9 Switch Stacking ConnectionsIt is best to be able to use the same model of hardware device and the same version of IOS when the switch is stacked o If the hardware models are different, be sure to ensure that the master version number of the stacking protocol used in the IOS on the switch is the same. If the master version number of the stacking protocol used is the same, but the version number after the decimal point is different, it can still be stacked, although it may result in some features being incompatible.14.3.2 Switch Stacking ElectionA stacked switch elects a Master device. The higher priority device is the Master, and if the priority is the same, the Master is elected based on complex factors (e.g., IOS features, version, hardware version, MAC address, etc.). The other switches are Members, and if a Master switch in the stack fails, the Master switch is re-elected. Switch stacking can help reduce the switch diameter and reduce the impact of STP reconvergence because in switch stacking, all switches use the same bridge ID for a specific spanning tree instance o14.4 Configuring STP and STP Protection14.4.1 Experiment 1: Configuring STPSTP role and working principle.