Cisco Cisco IOS Software Release 12.2(25)S

To set the unique event ID, or config ID Cisco IOS device identifier used by CNS services, use the cns 
id command in global configuration mode. To set the identifier to the host name of the Cisco IOS device, 
use the no form of this command.

cns id type number {dns-reverse | ipaddress | mac-address} [event]

no cns id type number {dns-reverse | ipaddress | mac-address} [event]

cns id {hardware-serial | hostname | string string} [event]

no cns id {hardware-serial | hostname | string string} [event]

The system defaults to the host name of the Cisco IOS device as the unique ID.

Global configuration

Type of interface (for example, ethernet, group-async, loopback, or 
virtual-template) and the interface number. Indicates from which interface 
the IP or MAC address should be retrieved in order to define the unique ID.

dns-reverse 

Uses DNS reverse lookup to retrieve the host name of the Cisco IOS device 
and assign it as the unique ID.

ipaddress 

Uses the IP address specified in the type number arguments as the unique ID.

mac-address 

Uses the MAC address specified in the type number arguments as the 
unique ID.

event 

(Optional) Sets this ID to be the event ID value, which is used to identify the 
Cisco IOS device for CNS event services. If both optional keywords are 
omitted, the event ID is set to the host name of the Cisco IOS device.

hardware-serial 

Uses the hardware serial number as the unique ID.

hostname 

Uses the host name as the unique ID. This is the system default.

string string

Uses an arbitrary text string—typically the host name—as the unique ID.