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define service{
use generic-service ; Inherit values from a template
host_name SW-1
service_description Port 1 Bandwidth Usage
check_command check_local_mrtgtraf!/var/www/mrtg/192.168.1.253_1.log!30,40!100,200!10
}
Let's also check your RRD files for MRTG. Not entirely certain how you installed MRTG on your system, but on mine they are located under /var/lib/mrtg - run ls -l against them.
For good measure, let's also see what MRTG says about your configs. Same deal, not sure where your binaries and whatnot ended up, but on my system that would be: