Notes for Cisco switches in networked systems

1. The Cisco switch filters out MAC addresses that are deemed to be obviously invalid. For example, if your device's MAC address is 57-14-00-xx-xx-xx, you cannot communicate with each other. It is unclear how to filter out and which are filtered out. The "Cisco Network Chinese assistant 5.2" tool does not see how to cancel the filter function. Therefore, do not overwrite the MAC address.

 

Usage of the first three digits of the MAC address code:

00000C  Cisco00000E  Fujitsu00000F  NeXT000010  Sytek00001D  Cabletron000020  DIAB (Data Intdustrier AB)000022  Visual Technology00002A  TRW000032  GPT Limited (reassigned from GEC Computers Ltd)00005A  S & Koch00005E  IANA000065  Network General00006B  MIPS000077  MIPS00007A  Ardent000089  Cayman Systems  Gatorbox000093  Proteon00009F  Ameristar Technology0000A2  Wellfleet0000A3  Network Application Technology0000A6  Network General (internal assignment, not for products)0000A7  NCD             X-terminals0000A9  Network Systems0000AA  Xerox           Xerox machines0000B3  CIMLinc0000B7  Dove            Fastnet0000BC  Allen-Bradley0000C0  Western Digital0000C5  Farallon phone net card0000C6  HP Intelligent Networks Operation (formerly Eon Systems)0000C8  Altos0000C9  Emulex          Terminal Servers0000D7  Dartmouth College (NED Router)0000D8  3Com? Novell?   PS/20000DD  Gould0000DE  Unigraph0000E2  Acer Counterpoint0000EF  Alantec0000FD  High Level Hardvare (Orion, UK)000102  BBN             BBN internal usage (not registered)0020AF  3COM ???001700  Kabel008064  Wyse Technology / Link Technologies00802B  IMAC ???00802D  Xylogics, Inc.  Annex terminal servers00808C  Frontier Software Development0080C2  IEEE 802.1 Committee0080D3  Shiva00AA00  Intel00DD00  Ungermann-Bass00DD01  Ungermann-Bass020701  Racal InterLan020406  BBN             BBN internal usage (not registered)026086  Satelcom MegaPac (UK)02608C  3Com            IBM PC; Imagen; Valid; Cisco02CF1F  CMC             Masscomp; Silicon Graphics; Prime EXL080002  3Com (Formerly Bridge)080003  ACC (Advanced Computer Communications)080005  Symbolics       Symbolics LISP machines080008  BBN080009  Hewlett-Packard08000A  Nestar Systems08000B  Unisys080011  Tektronix, Inc.080014  Excelan         BBN Butterfly, Masscomp, Silicon Graphics080017  NSC08001A  Data General08001B  Data General08001E  Apollo080020  Sun             Sun machines080022  NBI080025  CDC080026  Norsk Data (Nord)080027  PCS Computer Systems GmbH080028  TI              Explorer08002B  DEC08002E  Metaphor08002F  Prime Computer  Prime 50-Series LHC300080036  Intergraph      CAE stations080037  Fujitsu-Xerox080038  Bull080039  Spider Systems080041  DCA Digital Comm. Assoc.080045  ???? (maybe Xylogics, but they claim not to know this number)080046  Sony080047  Sequent080049  Univation08004C  Encore08004E  BICC080056  Stanford University080058  ???             DECsystem-2008005A  IBM080067  Comdesign080068  Ridge080069  Silicon Graphics08006E  Concurrent      Masscomp080075  DDE (Danish Data Elektronik A/S)08007C  Vitalink        TransLAN III080080  XIOS080086  Imagen/QMS080087  Xyplex          terminal servers080089  Kinetics        AppleTalk-Ethernet interface08008B  Pyramid08008D  XyVision        XyVision machines080090  Retix Inc       Bridges484453  HDS ???800010  AT&TAA0000  DEC             obsoleteAA0001  DEC             obsoleteAA0002  DEC             obsoleteAA0003  DEC             Global physical address for some DEC machinesAA0004  DEC             Local logical address for systems running DECNET

2. the preset recovery time of the Cisco switch port is about 30 seconds. That is, unplug the network cable and plug it in. It takes about 30 seconds for the indicator to change from yellow to green. Generally, the switch only takes about 4 seconds.

Therefore, if your device needs to be connected to IOT platform within 5 seconds after it is started up, it may be possible to connect 500 tplink switches, but 2000 ciso cannot connect.

Fortunately, you can modify this parameter to open the interface of the "Cisco Network Chinese assistant 5.2" tool:

Set "Fast port recovery" to enabled.