We have items and triggers automatically created for all interfaces, and we could also have a graph created for each interface, combining incoming and outgoing traffic.

In the same way as before, this is done with the help of prototypes:

1. Go to Configuration | Templates, click on Discovery next to C_Template_Linux, and then click on Graph prototypes. Click on Create graph prototype and enter Traffic on {#IFNAME} in the Name field.
2. Click on Add prototype in the Items section, and mark the checkboxes next to the incoming and outgoing network traffic items. Then, click on Select. Choose Gradient line for both items in the Draw style drop-down:

3. When done, click on the Add button at the bottom. Note that we had to specify the LLD macro in the graph name—otherwise, Zabbix would be unable to create graphs, as they would have had the same name.

With the prototype in place, let's go to Configuration | Hosts and click on Graphs next to A test host. If you see no graphs, wait a couple of minutes and refresh the page—the graphs should show up, one for each interface, again prefixed with the LLD rule name:

Navigating to Monitoring | Graphs and selecting A test host in the Host drop-down will show all of these graphs in the Graph drop-down. This way, traffic on a specific interface can be easily reviewed by selecting the appropriate graph—and without configuring those graphs manually first.