There's a tool built into CiscoWorks that will tell you which port a MAC address is connected to. It matches the switch CAM tables to the router ARP tables, so you can search by IP or MAC address.
-Mike ======================== Mike Smith Network Administrator Information Technology Services Bowling Green State University Email:[EMAIL PROTECTED] Phone (419) 372-9510 >I appreciate the help on this question. I think I need to further define my >question. How do you find out which switch a MAC address resides in a large >network environment. I am working with several large colleges/universities >who need to find a student's location in the network. They know the MAC >address or IP, but not the student who owns its. They all have over 2000+ >students and many switches/hubs where these students reside. The typically >have only 1-3 VLANS for students, so its tough to narrow down the location. >Some of them used to run Cabletron equipment and their proprietary VLAN >software called SecureFast. SecureFast maintained a searchable directory >with MAC, network address (IP, IPX, A-talk, Netbios etc.), switch, port, DNS >name etc. It was very easy to find a MAC address within seconds. Now we are >moving to 802.1Q and Cisco switches and are having severe withdraw. There >must be an easy way to insert a MAC or IP address and find it in the CAM >table without a lot of manual effort. > >Thanks again, I appreciate the help!! > >Jeffrey Reed >Classic Networking, Inc. > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Larry >Letterman >Sent: Saturday, March 16, 2002 6:35 PM >To: [EMAIL PROTECTED] >Subject: RE: Finding a MAC address [7:38560] > >On the router you can do a 'sh mac-addr-table addr xxxx-xxxx-xxxx(mac addr) >and it will show you the interface that the Mac-addr is on. > >On switches you can do a 'show cam xx-xx-xx-xx-xx-xx and it should give you >the port on the switch where the mac-addr is.. > >This works on our 6500 switches with msfc routing and supervisor cards.. > > >Larry Letterman >Cisco Systems >[EMAIL PROTECTED] > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of >Jeffrey Reed >Sent: Saturday, March 16, 2002 2:15 PM >To: [EMAIL PROTECTED] >Subject: Finding a MAC address [7:38560] > > >What utilities are you guys using to find MAC addresses across a large >campus network? If I have an end users IP address, check the routers ARP >for their MAC, whats the easiest way to find out which switch port? > >Thanks!! > >Jeff Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38617&t=38560 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
