If you don’t know especially if you’re a newbie with Cisco Routers, one of the annoying thing is the message;

Translating….. domain server (255.255.255.255)

 

User Mode
R1>xxxx

Translating "xxxx"...domain server (255.255.255.255)

(255.255.255.255)

Translating "xxxx"...domain server (255.255.255.255)

% Unknown command or computer name, or unable to find computer address

R1>
Enable Mode
R1#xxxx

Translating "xxxx"...domain server (255.255.255.255)

(255.255.255.255)

Translating "xxxx"...domain server (255.255.255.255)

% Unknown command or computer name, or unable to find computer address

R1#

 

Well, it is there for a reason and is doing something that may not be obvious. So here is the deal in Cisco’s own words;

By default, when a command in user or enable mode is entered into a router and this command is not recognized, the router believes that this is the host name of a device that the user is attempting to reach using telnet. Therefore, the router tries to resolve the unrecognized command into an IP address by doing an IP domain lookup. If no specific domain server has been configured on the router, the router will issue a broadcast for the command to be translated into an IP address. It can take several seconds for the router prompt to return while the router waits for a response to its Domain Name System (DNS) broadcast.

 

Simple fix?

Just add ‘no ip domain-lookup’ and save it. It should be gone!

Source : [ Cisco Online Doc ]