exclude un configured ports/interfaces on cisco

[aiiqbal]

I am trying to get interface usage on interfaces but i do not want to view interfaces which are by default down or not yet configured. is there a way to exclude them in the check. i am doing snmpv3

i am using following string.

./check_nwc_health -H 10.x.x.x --port 161 --username myusername --authpassword mypasswd --authprotocol sha --privpassword privpasswd --privprotocol aes --modre interface usage --units MB --lookback 3600 --multiline --selectedperfdata traffic_in,traffic_out

also, need to know how define warning thresholds and critical thresholds