I am reading the CCNP self Study BCMSN Official Exam Certificate Guide Fourth Edition. There is a System priority in the LACP set up. That is 2 bytes for priority value followed by a 6 byte MAC address. I am wondering what is the difference between system priority and the bridge ID related to STP. Bridge ID also consists of 2 bytes bridge priority and 6 bytes MAC address. if they are the same, why they are given two different names? Could any one give me a help on this?