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New Member

ISE error disable interface

After configuring DOT1x on access ports , some ports show error disabled without enabling the port-security , is their any way to increase the number of MAC addresses allowed on the port ? , is it possible to disable this feature

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New Member

ISE error disable interface


Sent us the show run commands of interfaces.



New Member

ISE error disable interface

here you are

interface GigabitEthernet1/0/2

switchport mode access

switchport voice vlan 91

authentication event fail action next-method

authentication event server dead action reinitialize vlan 184

authentication event server dead action authorize voice

authentication host-mode multi-domain

authentication order mab dot1x

authentication priority dot1x mab

authentication port-control auto


dot1x pae authenticator

spanning-tree portfast

Cisco Employee

Re: ISE error disable interface

Hi Eng.malak,

The port config provided by you the interface GigabitEthernet1/0/2 is configured for MDA that means an IP phone and a single host behind the IP phone are authenticated independently, even though both the IP phone and host machine are connected to a single switch port on the switch. If more than once device is detected in either domain, a security violation will be triggered. This can be a problem when a phone fails to authenticate properly. If a phone fails authentication, then the switch does not receive the "device-traffic-class=voice" VSA from the radius server and the switch will assume that the failed device was in the data domain. However if there is already a data device behind the phone, there will be now 2 devices in the data domain, and a security violation is triggered.  On this port only 2 MAC addresses are allowed. The switch place the client machine in a data vlan and the IP phone in a voice vlan. 

Configure the violation mode. The keywords have these meanings:

authentication violation shutdown | restrict | protect | replace}

•shutdown-Error disable the port.

•restrict-Generate a syslog error.

•protect-Drop packets from any new device that sends traffic to the port.

•replace-Removes the current session and authenticates with the new host.

Configuring 802.1x Violation Modes

Jatin Katyal

**Do rate helpful posts**

~BR Jatin Katyal **Do rate helpful posts**
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