PDF user manual for CopperEdge 150

&RQILJXULQJWKH2$0/RRSEDFN)XQFWLRQThe loopback function has two parts: an automatic functionand a manual function. You can operate them at the same timeor separately. The automatic function is simply for discoveringwhen a fault occurs; the manual function is for discoveringwhere the fault is on the connection.Automatic Loopback RequestsThe automatic loopback function will operate as long the portand the VC are UP and as long as the OAMAdminState functionis Enabled. It will operate at the periods specified in the Intervaland Timeout objects. It will record loopback failure in the OAM-State object.To configure the loopback function within the OAM function,first configure the ports and VCs as described in the previoussection, then the OAMAutoLBState object. You may want tomake changes in the loopback interval and the loopback timeout.Follow these steps:1. Check the ATM WAN port and the ATM VC for theirAdminStatus. Make sure they are both set to Up.2. Configure the ATM VC for OAMAutoLBState by settingit to Enable:CRAFT> set cmatmvcl [1.2.1.101]oamautolbstate=enabled3. Check the OAMLBInterval object. Its default is 17seconds; it has a range of 1 to 999 seconds. Reset it ifnecessary.OAMLBInterval specifies how often a Loopback Requestwill be sent until either a Loopback Response isreceived or a timeout occurs. If no response is receivedbefore timeout, the OAMState object indicates aloopback failure.4. Check the OAMLBTimeOut object. Its default is 18; ithas a range of 1 to 999 seconds. Reset it if necessary toa longer period.OAMLBTimeOut specifies how long Loopback Requestswill be sent. The timeout period must always be longerthan the interval period.With this configuration, the OAM function will send out periodicf5End2End Loopback requests to the device on the far end ofthe network. If the device at the far end receives the requests—if no breaks exist on the connection—it will return Loopback responsesduring each period. If the device on the near end doesnot receive a response before the timeout period end, it recordsa loopback failure in the OAMState object.&KDSWHU$GYDQFHG&RQILJXUDWLRQ