When working on Cisco Routers and switches, one gives an error command which takes it to long queue of DNS lookup. Not only is critical time wasted , it also becomes an irritant especially for newbies or ones who have started recently working on cisco commands. Infact “Cntrl+Shift+6” is also useless here.
But if one doesn’t want to wait forever when console becomes active again all you have to do is disable DNS lookup on the box.
By default DNS lookup is enabled on Cisco platform which cause delays in traceroutes and in few other cases. You can simply disable it using command :