FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
syadav
Staff
Staff
Article Id 336816
Description This article describes how to resolve a known issue users might face in the topology view of Managed FortiSwitches.
Scope FortiOS.
Solution

Known issue #960240 impacts the topology view of the Managed FortiSwitches in the FortiGate web graphical user interface. 

 

The topology view is accessible under WiFi & Switch Controller -> Managed FortiSwitch and displays the FortiSwitches managed by the FortiGate. 

When multiple FortiSwitches are interconnected via the inter-switch links (ISL), these ISLs may appear as dotted links (highlighted below) as shown in the below screenshot: 

 
 

Screenshot 2024-08-27 103754.png

 

Each of these dotted links represents a disconnected link. However, this is a GUI issue as the management connection to the FortiSwitches on the other end of those links remains active. 

 

This known issue is fixed in FortiOS v7.6.0 and will be fixed in FortiOS v7.4.5. 

 

In case a similar issue is seen in the future, collect the below logs and raise a TAC ticket.

  • Below is the output from the affected FortiSwitch CLI that is not showing the inter-switch line on the FortiGate GUI:

 

FSW# diag debug report

FSW# show full-config

 

  • FortiGate backup config file and screenshot from FortiGate GUI -> Wifi & Switch-Controller -> Managed FortiSwitches (Topology View).

 

  • Below are the outputs from the FortiGate CLI:

 

  1. execute switch-controller get-connection-status

  2. execute switch-controller get-connection-status <affected FSW SN>

  3. execute switch-controller get-physical-conn dot

  4. execute switch-controller get-physical-conn standard

     

  5. diagnose user device list

     

  6. diag switch-controller telemetry show switch-port <affected FSW SN>

  7. #FGT# config switch-controller managed-switch

    (managed-switch) # edit <affected FSW SN>

    (affected FSW SN) # config ports

    FGT (ports) # edit port51   (this is the inter-switch link connected port).

    FGT (port1) # get

    end

 

If the FortiSwitch has multiple inter-switch links, get the above output for each port.

 

Points 8 and 9 should be run simultaneously:

 

  1. FGT# diag debug reset
    FGT# diag debug application httpsd -1
    FGT# diag debug console timestamp enable
    FGT# diag debug enable


    Open the FortiGate GUI -> Select Managed FortiSwitches, open the topology view, wait for the page to load and stop the debug:

     

    FGT# diag debug disable
    FGT# diag debug reset

     

     

  2. Download and Install the FortiGate Support Tool Chrome browser plugin -> Open the FortiGate GUI -> Run the 'new capture' on the FortiGate Support Tool plugin -> Select the Managed FortiSwitches on FortiGate GUI -> Wait for topology view to load -> Stop the Capture.

     

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