Show port Utilization command

[Alex23]

Hello, I have a question regarding the way Extreme switches display traffic direction on its ports.

We have a GPS/weather-receiver station connected to one of our switches (Summit X450e) that transmit data only one way (from the GPS unit to our network). Thus, I'd expected to see traffic going 'into' the switchport and nothing else. However, when I issue a 'sh port 1:44 utilization' command I get the total opposite, with traffic being transmitted 'from' the switchport instead of 'to' the switchport. Am I reading this wrong? Please see output below:

Slot-1 MySwitch# sh por 1:44 utilization
Link Utilization Averages Thu Aug 14 14:17:13 2014Port Link Rx Peak Rx Tx Peak Tx
State pkts/sec pkts/sec pkts/sec pkts/sec
================================================================================
GPS_Unit A 0 0 7 10

Any input is appreciated. Thanks.

[DeangeloRoob]

On Extreme switches like the Summit X450e, the “Rx” column reflects packets received by the switch from that port, while the “Tx” column shows packets sent from the switch out that port. In your GPS/weather-receiver scenario, the device is sending data to the switch, so you would expect to see this counted under Rx.

[DeangeloRoob]

It looks like the behavior you're seeing is due to how Extreme switches report port statistics. In the output of the show port utilization command, the "Tx" (transmit) column represents traffic sent from the switch out to the connected device, and "Rx" (receive) shows traffic received by the switch from the device.

[abhijit_roy]

Hi All, I am new here, just willing to know is there any way to know a particular port is going in bad state in respect of hardware, or you can say the port is healthy or not, my switch is X440G2-48p-10G4, many thanks in advance.

[Alex]

Daniel, I have reviewed the Command Reference Guide and could not find the answer... that's why I posted it here. The show ports statistics command is consistent with what I found on the show ports utilization command... I know that the GPS only transmits one-way (from the GPS unit to the port). However, the switch is reporting the packets being transmitted on that switchport port, not received. Unless Extreme meant that the 'Tx' on the show port statistics means 'packets transmitted to this port' instead of 'packets transmitted to this port'.