show int | include 5 minute input rate
or 
show interfaces | include txload | line protocol
FastEthernet0/0 is administratively down, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255
Serial0/0 is administratively down, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255
FastEthernet0/1 is administratively down, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255
Serial0/1 is administratively down, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255
FastEthernet1/0 is up, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255
FastEthernet1/1 is up, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255
FastEthernet1/2 is up, line protocol is down 
     reliability 255/255, txload 1/255, rxload 1/255