Graph names are text and up to 20 characters. Only letters, numbers, @, -, and . are allowed. All other characters are removed. It is recommended that names complying with this are used. Any graph name that you try and use that is too long will be replaced with one that uses part of the name and a hash to try and ensure a consistent unique graph name is applied.

Graphs can be defined in some configuration settings such as interface names.

Graphs can also be created dynamically in some cases, e.g. L2TP based graphs are made based on the Chargeable-User-Id, Calling-Station-Id or User-Name for a connected line, and so can be defined from the RADIUS authentication response. It is recommended that the circuit ID is used where available, e.g. from BT platform RADIUS.

Whilst the FB2500 can manage thousands of graphs, new graphs will not be created if memory is not available.