debug help mac address on Cisco 2950 please!

josunin75josunin75 Member Posts: 44 ■■□□□□□□□□
Hello, Mr. Cisco gurus!

I know that switches by default if it does not know about the host mac address it will broadcast by default to all port except the one it originated from!

Is there any debugging commands to see all this from happening?
Any debugging commands to see the mac address learning?

Thank you!
on to BCMSN ^=============^

2 x 3550 EMI
2 x 2950
2 x 3640
1 x 2621


  • CiskHoCiskHo Member Posts: 188
    "sh mac-add" will show you what has already been learned and added to the mac address table. You could use wireshark to see the broadcast going out to whatever port the sniffer/PC was plugged into. Not sure of anything else.
    My Lab Gear:
    2811(+SW/POE/ABGwifi/DOCSIS) - 3560G-24-EI - 3550-12G - 3550POE - (2) 2950G-24 - 7206VXR - 2651XM - (2) 2611XM - 1760 - (2) CP-7940G - ESXi Server

    Just Finished: RHCT (1/8/11) and CCNA:S (Fall 2010)
    Prepping For: VCP and CCNP SWITCH, ROUTE, TSHOOT
  • jason_lundejason_lunde Member Posts: 567
    debug arp
    debug ip packet

    the list goes on and on. Pls only in lab though, not production hopefully.
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