Technical Tip: Maximum number of interface history widgets supported

[jintrah_FTNT]

Description

This article describes the maximum number of interface history widgets supported in FortiOS.

Scope

Any supported version of FortiGate.

Solution

FortiOS only supports monitoring a maximum of 25 history widgets in the interface.
If there are more than 25 widgets, the 26th widget will not be able to load any data.

Verify if the maximum limit has been reached by running the following debug commands and adding a new interface widget while they are active:

diag debug app forticron 2
diag debug enable

If the maximum number has been reached, the output will appear similar to the following:

Admin table has changed, updating interfaces for traffic history.
update_tr_history_intfs()-253: Maximum # of monitored interfaces reached. Failed to track new interface.

Disable the debugging afterwards:

diag debug disable

The CLI may also show the following error while adding interfaces for monitoring bandwidth:

config system interface

edit <interface name>

set monitor-bandwidth enable 

Cannot monitor this interface, already at max

node_check_object fail! for monitor-bandwidth enable

value parse error before 'enable'

Command fail. Return code -4 (reached the maximum number of entries)

Alternatively, list monitor-bandwidth enabled interfaces with the following command to check if there are already 25 widgets. This CLI command is available in FortiGate 7.0 GA and above.

diag debug enable

diag debug traffic interface
port1

port2

VLAN737

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