It is important to understand which uplink a VM or VMK interface uses for communication for both troubleshooting and design aspects.
#TRACK CISCO MAC ADDRESS PORT HOW TO#
We made it to Friday! And, believe it or not, it is about to be May 2022.This document describes how to trace MAC addresses of a virtual machine (VM) and VMkernel (VMK) interface at these network levels:
#TRACK CISCO MAC ADDRESS PORT SOFTWARE#
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Most of the switches will show that MAC address on a single port, usually 1 or 24, that is trunked to another switch. OP, sounds like a great excuse to start doing some research and reading on your Cisco CLI? ) All you need to do is log into the switches and display the ARP tables. While tracing it back using the ARP table is a better method if you have managed switches, running a ping and manually unplugging stuff until the ping stops IS a foolproof, if slow, way of doing it! ) Well, it technically WAS the best answer. Please give us the courtesy of letting us know what you found as the problem and fix. You marked one question as Best Answer, but you have not said if you actually fixed the issue. At least that was my understanding of what was said. the OP didn't say if they could or couldn't find 00:1b:54:c7:31:40. If you read the message correctly, I believe the MAC 00:1B:54:C7:31:7F is the one they cant physically find, the one that's showing on the IP Scanner App. This would give you an idea of what kind of Cisco device you’re looking for at least. With such a similar MAC address, if you can physically find the device 00:1b:54:c7:31:40, it stands a good chance that the other device is an identical or very similar model.
Even if it’s not a mix up, and I can’t imagine it is. So the device I've been talking about on the IP Scanner apps says it's 00:1B:54:C7:31:7F but I can't find it on any of the MAC Address Tables on the switches.īut on the Mac Address Tables, It shows a similar MAC Address 00:1b:54:c7:31:40, But I cannot find it anywhere on any IP Scanner application.Ĭan you physically find the device 00:1b:54:c7:31:40, disconnect it afterhours, see if the IP Scanner apps 00:1B:54:C7:31:7F disappears. Is it possible that my two IP scanner applications or the switches are getting the MAC Address of the device mixed up? Once you find the cable then you have to find where it goes physically from there.Īlternatively you can run CDP or LLDP on all switches until you find the adjacency for the device in question. Eventually you will trace it to the switch it is plugged into. If it is the port of another switch, login to that switch and run the exact same command as above. This will give you either the port the device is plugged into or a port of another switch. Next: (replace x's with mac address found above) This will give you the mac address you are looking for to track this device down. This will give you the entry in the arp table which has the IP address to mac address association. x.x.x.x is for the ip address of the device. On whatever device is hosting layer 3 for that specific subnet run the following command. The below commands are assuming cisco switches. And that Mac must be in your CAM tables on the switches. If the device is reachable on your network, it must have a mac address. I would suggest not tot trusting the scanner app for a second.
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