metrotek Bercut-ET, Руководство по эксплуатации

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50 Analysis. Typical tasks and solutions
5.10 OAM
An important task is to provide high quality of administrating and main-
tenance for Ethernet-networks. To regulate these tasks the IEEE 802.3ah[8]
standard (also known as
Ethernet in the First Mile (EFM) OAM ) has been
worked out.
OAM (Operations, Administration, and Maintenance) is a protocol of
monitoring the link state. The protocol operates at the Data Link Layer of
OSI model. To transmit data between two Ethernet-devices, OAM protocol
data units (OAMPDU) are used.
An important feature of the OAM protocol is providing the ability to use
Loopback mode for the remote end. Both devices should support the IEEE
802.3ah standard.
To establish connection between Bercut-ET and remote device via OAM
protocol and to switch on Loopback mode it is necessary to execute the fol-
lowing actions.
•
Connect Bercut-ET and remote device directly in accordance with
fig. 5.49 given below.
physical connection
remote device
loopback
Figure 5.49. OAM testing scheme
On the remote device:
•
Enable OAM protocol function in active or passive mode.
On the local device:
•
Switch to the OAM menu (see fig. 5.50).
•
In the menu item Port select port the remote device is connected to.
•
In the menu item Mode select active operating mode of OAM protocol.
•
The discovery state of the remote device must be Send any .
•
Switch to the Remote device menu. Information about remote device
will be displayed on the screen.
Bercut-ET. Operations manual