To make a long story short, I have some newer off-brand switches in just a few locations. The main feature I'm missing on these switches vs our nicer (but old) 3Com equipment is the ability to trace a mac address down to a specific port in the address tables. The off-brand switches do support snmp. Can someone recommend a good (and cheap/free) software tool (probably snmp-based) that will allow me to trace a mac address down to a specific switch port?
Are there cli tools? You could do something like (I know it's cisco, bear with me):
switch>ping 192.168.101.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.101.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Then search the arp for the IP:
switch>show arp | include 101.1 Internet 192.168.101.12 37 0020.6b61.a83d ARPA Vlan101 Internet 192.168.101.1 - 001d.09fd.71c0 ARPA Vlan101
Now that you know the MAC address, search the mac address table:
switch>show mac-address-table | include 71c0 * 1 000d.662f.71c0 static No - Router * 10 001d.09fd.71c0 dynamic Yes 20 Gi2/43
Voila! Port 43 on the second internal switch.
I have no idea whether or not Netdisco supports your devices, but that's the tool I've turned to in the past for keeping track of the physical location of MAC addresses on my networks.
I agree with him, you need to find the mac address first, and look for it ini your 3Com switch.
I have 3Com SuperStack III 4200 series, you need to login to your switch, and use these command: bridge --> addressDatabase --> summary to display all mac address on your switch.