There are PC A and PC B. PC A has an IP address reserved in DHCP. PC A was switched on and after some work was done user switched it off. PC B is configured with a static IP address belonging to PC A (by accident). It is left switched on. When PC A is switched on, port security is activated and the port is shutdown. The port reported that the MAC address of PC B was found.
Sounds like you need to correct the duplicate IP address and then 'clear arp-cache'. Since PC B has the current entry in the arp cache when PC A comes on and shows the same IP address it matches it to the duplicate arp entry.
Whose arp cache is corrupted? The switch does not have any arp entries on PC A and PC B. Port security is only activated when the illegal MAC is seen from the port. So how did the illegal MAC end up there?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...