| Description | This article explains the process to execute when a port goes down, is re-enabled or bounced, and comes back on half duplex. |
| Scope | FortiGate. |
| Solution |
Whenever a port runs at whichever speed and full duplex, FortiGate can be reloaded under any circumstance or simply bounced. But the port comes back on in half-duplex, as can be seen in the image below by using the following diagnose command:
diagnose hardware deviceinfo nic <desired port>
For example, in this case:
diagnose hardware deviceinfo nic internal2 
If this happens, a simple bounce or configure port in full-duplex won't be enough; hence, to fix this, follow up below steps:
config system interface set status down end
---------Speed--------------
config system interface set speed 1000full set status up end
After executing the above steps, the port will come up with full duplex as in the image below:
Note: Following implementation of all changes, the port shows physical connectivity but remains administratively down, indicating a hardware fault. Initiation of the RMA process is required.
Related articles: Technical Tip: How to adjust the Maximum Transmission Unit (MTU) value |
