STP Configuration and Verification
Cisco switches usually use STP (IEEE 802.1D) by default. You can buy some Cisco switches and connect them with Ethernet cables in a redundant topology, and STP will ensure that frames do not loop. And you never even have to think about changing any settings!
Although STP works without any configuration, most medium-size to large-size campus LANs benefit from some STP configuration. With all defaults, the switches choose the root based on the lowest burned-in MAC address on the switches because they all default to use the same STP priority. As a better option, configure the switches so that the root is predictable.
For instance, Figure 2-1 shows a typical LAN design model, with two distribution layer switches ...
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