http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00801c9199.shtml
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094a9b.shtml
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00801576ff.shtml
http://tools.cisco.com/Support/SNMP/do/BrowseMIB.do?local=en&mibName=BRIDGE-MIB
http://www.gambitcomm.com/site/products/snmp_simulator.shtml
http://blog.****.net/nickkwan/article/details/5535685
http://blog.****.net/stevexk/article/details/559246