Troubleshooting Tip: FortiLink Ports down, only one port up
| Description | This article explains an issue when user has a FortiGate cluster (A-P) connecting to a FortiSwitch, multiple ports are configured and connected, but only one port shows up. |
| Scope | FortiGate FortiLink FortiSwitch |
| Solution | Topology: FortiGate and FortiSwitch topology match the following two scenarios. HA-mode FortiGate units managing a FortiSwitch two-tier topology HA-mode FortiGate units managing a single FortiSwitch unit Symptom: In this example, the user has two ports configured in a FortiLink and connects to the same FortiSwitch, but only one port shows up:
Reason: This is due to a config mistake in the FortiLink Setup as seen below. By default, the option 'FortiLink Split interface' is enabled and as the tooltip suggested, this should only be enabled when the FortiLink connects to more than 1 FortiSwitch which is not the case here.
Correction: After the option 'FortiLink Split Interface' is disabled as seen in the screenshot below, both links come up. If FortiLink includes more than two ports, then all ports will come up. This option should only be disabled when connecting to the same FortiSwitch device or when connecting to a MCLAG peer group. If this option is disabled and a connection is made to different FortiSwitch devices (without MCLAG), it could cause network loops.
CLI configuration:
config system interface set fortilink-split-interface disable next end
Related documents: HA-mode FortiGate units managing a single FortiSwitch unit. HA-mode FortiGate units managing a FortiSwitch two-tier topology |
