Nortel Networks 8000 - Manual (Page 419)

Nortel Secure Router 8000 Series
Configuration -WAN Access 10 Low-speed ATM configuration
The system view is displayed.
Step 2 Run:
interface interface-type interface-number[.subinterface-number ]]
The ATM interface view is displayed.
Step 3 Run:
oam
An OAM interface view is displayed.
Step 4 Run:
loopback vpi/vci { end-loopback | seg-loopback [ llid llid ] } [ times ]
The cell loopback function is configured.
The OAM provides the loopback test function for the convenient fault location and test. The
loopback test refers to that the loopback cells is inserted in the VC/VP link of a certain
connection point and is looped back in another connection point. The system detects and
locates the faults of the link through the received loopback cells.
CAUTION
When the cell loopback function is applyed on the links with heavy traffic, some loopback
cells may be lost.
The loopback includes the following three types: segment loopback, end loopback, and
loopback of the specified point.
• Before configuring the loopback of the segment point, you need to configure the end
loopback point as the segment point.
• Before configuring the loopback of the end point, you need to configure the end
loopback point as the end point.
• The end point can only start the loopback of the end point, and the segment point can
start the loopback of the segment or end point.
• Before configuring the loopback of the specified point, you need to configure loopback
point as the segment point.
—End
10.10.5 Inserting the OAM Cells
Do as follows on the routers:
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
Issue 5.3 (30 March 2009) Nortel Networks Inc. 10-33