Technical Tip: Spanning tree in LAG and MCLAG

sachitdas_FTNT · 09-04-2025

Description This article describes the reason for 'FortiLink Switch new peer detected' logs on FortiGate Switch-Controller Event logs. Scope FortiGate versions 7.4.8, 7.6.3, Managed FortiSwitch v7.6.2/v7.4.7. Solution Functionality Impact and Symptom...

sachitdas_FTNT · 07-28-2025

Description This article describes how to configure loop guard, BPDU guard, and root guard on multiple managed FortiSwitches, multiple ports from the FortiGate GUI. Scope Managed FortiSwitches, FortiGate, v7.4.x and above. Solution Refer to the link ...

sachitdas_FTNT · 07-24-2025

Description This article describes the reason for the 'ED' flag on the MCLAG-ICL interface when MCLAG-ICL peers' FortiSwitches are root Bridges. Scope FortiSwitch version 7.x and above. Solution In a multi-tier MC-LAG ICL topology, where Tier-1 Forti...

sachitdas_FTNT · 06-25-2025

Description This article describes the process of application debugging to determine when 802.1x authentication fails. Scope FortiSwitch 7.x and above. Solution Refer to the following configuration on the FortiSwitch port: edit "port5" set native-vla...

sachitdas_FTNT · 06-02-2025

What Is QoS? QoS (Quality of Service) refers to the ability of a network to provide different priority levels to different applications, users, or data flows, or to guarantee a certain level of performance. QoS helps ensure: Low latency for real-time...

sachitdas_FTNT · 04-08-2025

Hi Kurt, I am assuming that you have given IP of 10.100.99.2 to the FortiSwitch's internal interface and not the SVI. In that case, when we connect 10.100.99.2 to FGT X2 interface 10.100.99.1, the traffic will flow as untagged vlan. Usually this shou...

sachitdas_FTNT · 02-18-2025

Hi Björnar, Currently we don't have the option to prioritize one link over another and configure a fallback scenario.

sachitdas_FTNT · 02-16-2025

Thats correct, p2p is not possible in this design. p2p means FGT-FSW-cisco-FSW.https://docs.fortinet.com/document/fortiswitch/7.6.1/fortilink-guide/801183/fortilink-over-a-point-to-point-layer-2-network Fortilink over layer3 is the correct approach.

sachitdas_FTNT · 02-16-2025

I tested in FSW version 7.4.4 against FortiGuest and it works fine. Have you tried configuring from FSW CLI? It could be a GUI issue where 'remote' option shows greyed out. Try upgrading FSW to the latest 7.4.6. my config FYI:- config system adminedi...

sachitdas_FTNT · 02-16-2025

Please refer this: https://docs.fortinet.com/document/fortiswitch/7.6.1/fortilink-guide/617516/determining-the-network-topology

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Troubleshooting Tip: FortiLink Switch new peer detected logs on FortiGate Switch-Controller Event logs

Technical Tip: Configuring loop guard, BPDU guard, root guard on managed FortiSwitches from FortiGate GUI

Technical Tip: ED flag on ICL interface

Troubleshooting Tip: 802.1x auth failing due to match condition

Understanding Quality of Service (QoS) in Networks – From Ethernet to FortiSwitch

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Technical Tip: Spanning tree in LAG and MCLAG

Troubleshooting Tip: Multicast traffic causing hig...

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Troubleshooting Tip: MCLAG-ICL interface in STP di...

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Re: Multi-tier ICL-MCLAG configuration

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