It is always best practice to perform a full network audit prior to any migration. This should include:
- Full back up of all security systems (including switches, routers) in case a back-out needs to be performed.
- Physical and logical network diagram with visual audit
Understanding exactly where cables run in the network and verifying they are all correctly labeled is essential to avoid mistakes and unnecessary downtime during the upgrade. Don’t overlook simple things such as:
- Do I have enough spare interfaces on my switches?
- Do I have the right fiber (single/multi mode) and right connectors (LC, FC, MTRJ, SC, ST)?
- Do I have spare cables? (in the heat of the moment, it is a simple mistake to break an RJ-45 connector or damage a fiber)
- Do I have space in the rack for the new equipment?
- Do I have enough power sockets?
No matter how securely a FortiGate is configured in the network, it cannot help if it has been bypassed; visually checking where the device sits in the network in relation to other devices will ensure you are maintaining security and verify the network diagram is ‘as built’. Details of all networks including subnet masks should be documented at this point to ensure that the replacement device is configured with the correct information.