![Metrodata NetTESTER NT1003 User Manual Download Page 81](http://html1.mh-extra.com/html/metrodata/nettester-nt1003/nettester-nt1003_user-manual_1779476081.webp)
METRODATA NetTESTER FAMILY USER MANUAL
76-02-107 Rev.A
Page 81 of 133
The loopback can be selected to operate at one of 3 different 'Layers':
L2
All packets addressed to either the 'magic' MAC address or the modified
unit MAC address will be looped. Source and destination MAC addresses
will be swapped.
L3
All packets addressed to the unmodified MAC address of the unit, that
carry an IP payload with the Protocol byte matching the selected value
will be looped. Source and destination MAC and IP addresses will be
swapped.
L4
All packets addressed to the unmodified MAC address of the unit, that
carry a UDP payload with the destination port matching the selected
value will be looped. Source and destination MAC and IP addresses, and
UDP ports will be swapped.
14.2.4.2 Protocol
Menu Tree: Main Set-Up /
T
esting /
S
AM Tester /
P
rotocol
If the L3 loopback is selected, a value for the IP Protocol byte must be specified.
Take care to avoid protocols that are used for management of the unit (eg. UDP,
TCP) as the loopback effectively block these from reaching the unit's management
entity.
14.2.4.3 UDP Port
Menu Tree: Main Set-Up /
T
esting /
S
AM Tester /
U
DP Port
If the L4 loopback is selected, a value for the UDP port must be specified. Take care
to avoid ports that are used for management of the unit (e.g. SNMP, TFTP, NTP) as
the loopback effectively block these from reaching the unit's management entity.
14.2.5
SAM Tester (Tester Function)
Menu Tree: Main Set-Up /
T
esting /
S
AM Tester
SAM TESTER
sam Function Tester
Multiple tests Disabled
Report settings <menu>
Test parameters <menu>
Peer <menu>
state Running
Stop test
proGress <display>
View report <display>
sEnd report
14.2.5.1 Multiple Tests
Menu Tree: Main Set-Up /
T
esting /
S
AM Tester /
M
ultiple Tests