[rudedog]

if your local to the machine.

Pull down the console and type

map x/a

x=game type
a=map name

ie
map dm/the_name_of_the_map

remember that not all map names are the same as their PK3 file

For more info on all these commands, check out my site at
http://www.mohadmin.com
look under guides for Rudedog's complete rcon guide.