PTN 3900s are used for deployment in an office. The networking at the core layer is A-B-C-D-E-F-A. The iManager U2000 V100R002C01SPC002 is used for equipment management. The software version of the PTN 3900 is 5.59.02.34. The versions of the ExtBIOS and BIOS are 9.24.43 and 8.24.21 respectively.
After tunnels are configured on the U2000, the LSP status is displayed as Local Available after query on both sides. After configuring a PWE3 service, a user right-clicks the service and chooses Manage PWE3 Service > Ethernet OAM > LB Test from the shortcut menu, and then clicks Run to perform a loopback (LB) test. When the progress reaches 100%, the user queries the number of transmitted packets and number of received packets in LB Statistic Information and finds that the number of received packets is zero.
In the NE Explorer, the user chooses MPLS Management > PW Management and sets OAM Status to Enable in PW OAM Parameter (the same operation is performed on the peer NE). The User right-clicks PW data, chooses Query OAM Status from the shortcut menu, and finds that Local Working Status is displayed as Local Available and Remote Working Status is displayed as Remote Available. It seems that the PW service is available. Nevertheless, different conclusions are obtained after the same PW service is tested.