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The Two-Way Active Measurement Protocol (TWAMP) is a protocol that is used for measuring network performance between devices.
The FortiGate link-monitor can be configured to use TWAMP.
- To configure a remote FortiGate to act as a TWAMP server.
config system probe-response
set port <port>
set mode twamp
set security-mode authentication
set password <password>
end
The probe response must be set to listen on the incoming interface:
config system interface
edit "port5"
set ip 10.103.0.2 255.255.255.0
set allowaccess probe-response
next
end
Note: ‘set allowaccess probe-response’ will only allow the probe-response and will overwrite other access configured on the interface. If other access is required, such as ‘https’ or ‘ping’, this will have to be configured as well. If ‘allowaccess’ is already configured for other types of access. then the ‘append’ command can be used to add the 'probe-response’
Example:
config system interface
edit "port5"
append allowaccess probe-response
next
end
- Configure the link-monitor on the local FortiGate. The port here must match the port used in step 1.
config system link-monitor
edit "LM_TWAMP"
set srcintf "port5"
set server "10.103.0.2"
set protocol twamp
set port <port>
set security-mode authentication
set password <password>
next
end
- Once the link monitor is configured, verify it is working with the ‘diagnose sys link-monitor status’ command.
diagnose sys link-monitor status
Link Monitor: LM_TWAMP, Status: alive, Server num(1), HA state: local(alive), shared(alive)
Flags=0x1 init, Create time: Fri Oct 25 17:23:08 2024
Source interface: port5 (7)
VRF: 0
Interval: 500 ms
Service-detect: disable
Diffservcode: 000000
Class-ID: 0
Peer: 10.103.0.2(10.103.0.2)
Source IP(10.103.0.1)
Route: 10.103.0.1->10.103.0.2/32, gwy(10.103.0.1)
protocol: twamp(9200), state: alive
Latency(Min/Max/Avg): 0.323/0.845/0.495 ms
Jitter(Min/Max/Avg): 0.001/0.400/0.093 ms
Packet lost: 0.000%
MOS: 4.404
Number of out-of-sequence packets: 0
Fail Times(0/5)
Packet sent: 759, received: 758, Sequence(sent/rcvd/exp): 759/759/760
Directional Stats:
IN:
Latency(Min/Max/Avg): 0.323/0.845/0.495 ms
Jitter(Min/Max/Avg): 0.001/0.400/0.093 ms
Packet lost: 0.000%
MOS: 4.404
Number of out-of-sequence packets: 0
Peer packet sequence(current/exp): 759/760
OUT:
Latency(Min/Max/Avg): 0.000/0.000/0.000 ms
Jitter(Min/Max/Avg): 0.000/0.000/0.000 ms
Packet lost: 0.000%
MOS: 4.404
Number of out-of-sequence packets: 0
Related articles:
Technical Tip: Link monitor
Technical Tip: Configuring Performance SLA with TWAMP probes
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