思科交换机快速定位流量异常端口

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