As stated earlier, STP makes two assumptions about the environment in which it has been enabled, as follows:
- All links are bidirectional and can both send and receive Bridge Protocol Data Units
- All switches can regularly receive, process, and send Bridge Protocol Data Units
In real-world networks, these two assumptions are not always correct. In situations where that is the case, STP may not be able to prevent loops from being formed within the network. Because of this possibility, and to improve the performance of the basic IEEE 802.1D STA, Cisco has . . .
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