When a PC is connected to a switch port, firstly the port issues an 802.1x authentication challenge to the attached device (the 802.1x supplicant). The supplicant replies with username and password and then an authentication request is passed to a configured Radius server.
The error message can look similar to this:
%DOT1X_SWITCH-5-ERR_ADDING_ADDRESS: Unable to add address [mac address] on Fa0/10
This means that the supplicant MAC address cannot be added. This can happen when the TCAM is full or the address exists as a secure address on another port.
The message can come from the port-security subsystem. In some cases, these messages are generated by switches that run Cisco IOS Software Release 12.2(25)SEE2.
If this message appears only once, then this can be ignored.
In order to resolve this issue, if the hardware is full, remove some Dynamic addresses with the clear mac address-table command, which are automatically added to the address table and dropped from it when they are not in use.
If the supplicant address is secured on another port, manually remove it from that port with the clear port-security command.
Hello, I received a Cisco Catalyst 9300 and I'm trying to figure out how to set it up. I have looked on Google / YouTube and can't find anything on getting it setup. The attached stock image is the exact setup I have. Do I need to purchase a network ...
Hello. I am trying to configure MVPN profile 0 on my SP lab and one of my PEs is running IOSXR. However, I am a bit confused with the configuration. I tried to follow the IOS XR mVPN profiles configuration guide and my workbook, and they both configured P...
Hi all networking pros, As you can see in the title, I was actually researching on the network topology of the internet backbone and also the internet service providers, but unfortunately I really couldn't find more information despite whole day of g...
In setting up a few ASAv using SR-IOV I'm finding the ordering of the interfaces in vSphere doesn't reliably correspond to the interfaces on the host. For example:Normally:Man0/0: Network Adapter1 [E1000]Te0/0: Network Adapter2 [SR-IOV]Te0/1: Networ...