Chapter 17 System Administration : Interfaces : Probing Interfaces
  
Probing Interfaces
Server probes can be used on interfaces. In order for this to occur, the probe response mode must first be configured, then the probe response must be allowed administrative access on the interface. The probe response mode can be:
none
Disable probe.
http-probe
Http probe.
twamp
Two way active measurement protocol.
Both steps must be done through the CLI.
Configuring the probe
config system probe-response
set mode http-probe
end
Allowing the probe response to have administrative access to the interface
config system interface
edit <port>
set allowaccess probe-response
end
end