联网系统中Cisco交换机的注意事项
1、Cisco交换机预设会过滤掉一些它认为明显不合法的MAC地址，比如：如果你的设备的MAC地址是57-14-00-xx-xx-xx，无能如何都不能通讯。具体是如何过滤的，哪些被过滤掉了，不清楚，从“思科网络中文助理5.2”工具中也没有看到如何取消过滤功能。因此不要乱烧录MAC地址。MAC地址码前3码的占用情况：
00000CCisco
00000EFujitsu
00000FNeXT
000010Sytek
00001DCabletron
000020DIAB (Data Intdustrier AB)
000022Visual Technology
00002ATRW
000032GPT Limited (reassigned from GEC Computers Ltd)
00005AS & Koch
00005EIANA
000065Network General
00006BMIPS
000077MIPS
00007AArdent
000089Cayman SystemsGatorbox
000093Proteon
00009FAmeristar Technology
0000A2Wellfleet
0000A3Network Application Technology
0000A6Network General (internal assignment, not for products)
0000A7NCD X-terminals
0000A9Network Systems
0000AAXerox Xerox machines
0000B3CIMLinc
0000B7Dove Fastnet
0000BCAllen-Bradley
0000C0Western Digital
0000C5Farallon phone net card
0000C6HP Intelligent Networks Operation (formerly Eon Systems)
0000C8Altos
0000C9Emulex Terminal Servers
0000D7Dartmouth College (NED Router)
0000D83Com? Novell? PS/2
0000DDGould
0000DEUnigraph
0000E2Acer Counterpoint
0000EFAlantec
0000FDHigh Level Hardvare (Orion, UK)
000102BBN BBN internal usage (not registered)
0020AF3COM ???
001700Kabel
008064Wyse Technology / Link Technologies
00802BIMAC ???
00802DXylogics, Inc.Annex terminal servers
00808CFrontier Software Development
0080C2IEEE 802.1 Committee
0080D3Shiva
00AA00Intel
00DD00Ungermann-Bass
00DD01Ungermann-Bass
020701Racal InterLan
020406BBN BBN internal usage (not registered)
026086Satelcom MegaPac (UK)
02608C3Com IBM PC; Imagen; Valid; Cisco
02CF1FCMC Masscomp; Silicon Graphics; Prime EXL
0800023Com (Formerly Bridge)
080003ACC (Advanced Computer Communications)
080005Symbolics Symbolics LISP machines
080008BBN
080009Hewlett-Packard
08000ANestar Systems
08000BUnisys
080011Tektronix, Inc.
080014Excelan BBN Butterfly, Masscomp, Silicon Graphics
080017NSC
08001AData General
08001BData General
08001EApollo
080020Sun Sun machines
080022NBI
080025CDC
080026Norsk Data (Nord)
080027PCS Computer Systems GmbH
080028TI Explorer
08002BDEC
08002EMetaphor
08002FPrime ComputerPrime 50-Series LHC300
080036Intergraph CAE stations
080037Fujitsu-Xerox
080038Bull
080039Spider Systems
080041DCA Digital Comm. Assoc.
080045???? (maybe Xylogics, but they claim not to know this number)
080046Sony
080047Sequent
080049Univation
08004CEncore
08004EBICC
080056Stanford University
080058??? DECsystem-20
08005AIBM
080067Comdesign
080068Ridge
080069Silicon Graphics
08006EConcurrent Masscomp
080075DDE (Danish Data Elektronik A/S)
08007CVitalink TransLAN III
080080XIOS
080086Imagen/QMS
080087Xyplex terminal servers
080089Kinetics AppleTalk-Ethernet interface
08008BPyramid
08008DXyVision XyVision machines
080090Retix Inc Bridges
484453HDS ???
800010AT&T
AA0000DEC obsolete
AA0001DEC obsolete
AA0002DEC obsolete
AA0003DEC Global physical address for some DEC machines
AA0004DEC Local logical address for systems running DECNET
2、Cisco交换机端口预设的恢复时间是30秒左右，即拔掉网线再插上，指示灯从黄色变到绿色大概需要30秒，而一般交换机只需要4秒左右。
因此，如果你的设备要在想在开机5秒内连上线就要注意了，可能一般的500块的TPLink交换机可以，而2000块的Ciso反而无法连线。
还好，这个参数可以修改，打开“思科网络中文助理5.2”工具这个界面：
将端口的“快速端口恢复”设置为enabled。
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