I have cisco WS-C3650-48TS SW version 03.03.05SE as L3, i need to monitor the traffic on a trunk port?
How much bandwidth its consuming?
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The show interface command will give you 5 minute input and output bandwidth
Switch# show interfaces gigabitethernet3/0/2 GigabitEthernet3/0/2 is down, line protocol is down (notconnect) Hardware is Gigabit Ethernet, address is 2037.064d.4381 (bia 2037.064d.4381) MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 0 input packets with dribble condition detected 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out
If you want to create a graph of the bandwidth, use something like MRTG to set up regular polling of the interface traffic through SNMP. MRTG will create a nice graph of the data i.e.
To enable PRTG, set up a Read-Only community string on the switch:
snmp-server community <your-community-string> ro
Then configure the device in PRTG using the following settings:
IP Address/DNS Name: IP address of switch Sensor Management: Automatic device identification (standard, recommended) Credentials for SNMP Devices: SNMP Version: 2c Community String: <your-community-string>
There are other options which allow you to look at the bandwidth of individual traffic flows on a port such as IP accounting and NetFlow, although these do not usually work properly on L3 switches as they rely on traffic being process switched.