List of Common Maintenance Operations

This topic lists common maintenance operations.

Function	Maintenance Function	Usage	Application Scenario
Communication maintenance	Checking the Network Communication Status	Check network communication status to know about the communication between the U2000 Web LCT and NEs.	A running network may suffer intermittent disconnection or NE unreachability due to the unstable data communication network (DCN) between the server and clients. Then you can perform this task.
	Performing NE ID-based Ping Tests	From the test result, you can learn the packet loss rate and delay that reflect the network status.	You can perform an NE ID-based ping (ECC ping) test on NEs to check the communication between two NEs.
	Performing NE ID-based Traceroute Test	From the test result, you can learn transit nodes and the communication status between the two NEs.	You can perform an NE ID-based traceroute (ECC traceroute) test on NEs to check the communication between two NEs, find the transit NEs between them, and locate a fault.
	Performing IP Address-based Ping Tests	The ping result contains information such as packet loss and delay, which helps you ascertain the live network status.	You can ping the IP address of a third-party NE from Huawei NE to check their connection status.
	Performing IP Address-based Traceroute Tests	The traceroute result shows whether the two NEs can communicate with each other and displays their intermediate nodes.	You can traceroute an address of a third-party NE from Huawei NE to check their connection status or identify faulty nodes or links between the two NEs.
Optical power management	Querying Optical Power of a Board	If the optical power is too high or too low, damage to optical components or bit errors may be caused, affecting the service. Querying the optical power of the specific board is a common method used during maintenance to determine whether the optical power has changed.	Periodically query the board optical power to prevent services from impact of abnormal optical power.
Microwave link maintenance	Testing the Fade Margin	Running microwave links may fail because of many factors. To address the abnormal fade caused by climate, users need to ascertain whether microwave links have sufficient fade margin. If the fade margin is insufficient, users can adjust the TX power of the peer NE.	In the hardware acceptance test of a project, the fade margin is tested to check the deviation between the actual value and the theoretical value in network planning.
	Testing the Connectivity of IF Cables	By testing intermediate frequency (IF) cables, you can detect and locate faults on microwave equipment hardware.	The connectivity of IF cables needs to be tested.
	Setting Loopback for the Microwave Link	Loopback status can be queried and set for IF and RF interfaces on the source and sink NEs of a one-hop microwave link, which facilitates NE fault diagnosis.	Faults occur on microwave links and need to be diagnosed.
	Scanning ODU Frequency Interference	Wide use of microwave communication may lead to a shortage of spectrum resources, high usage of channels, and severe interference between channels. You can use the automatic frequency scanning function provided by the U2000 Web LCT to check whether interference occurs on transmit frequencies.	Interference needs to be detected on the local ODU.
Network maintenance	Diagnosing Ethernet Protocol Faults	In the case of an Ethernet service fault, you can diagnose the Ethernet protocol and then restart the protocol state machine by restoring the protocol, to remove the protocol faults.	This operation can be performed when Ethernet services run into faults.
	Checking the Network Communication Status	You can check network communication status to know about the communication between the U2000 Web LCT and NEs.	A running network may suffer intermittent disconnection or NE unreachability due to the unstable data communication network (DCN) between the server and clients. You need to check the network communication status.
	Packet Header Analysis	Packet header data helps diagnose complicated network faults.	When complicated network faults occur, engineers can analyze packet header data to find the fault points.
Service maintenance	Testing Ethernet Service Paths	If network cables are misconnected or are faulty, the Ethernet service paths may be faulty. Services are then affected. Hence, the Ethernet service paths must be normal.	This operation can be performed when Ethernet services run into faults.
Service maintenance	Diagnosing Ethernet Protocol Faults	In the case of an Ethernet service fault, you can diagnose the Ethernet protocol and then restart the protocol state machine by restoring the protocol, to remove the protocol faults.	This operation can be performed when Ethernet services run into faults. Navigation Path: In the NE Explorer, select an Ethernet board and choose Configuration > Ethernet Maintenance > Protocol Fault Management from the Function Tree.
NE maintenance	Performing a PRBS Test	You can perform a PRBS test on a path to check the quality of the path. The test result is displayed in the coordinates pane.	When services run into faults, you can perform a PRBS test to check whether the line board, tributary board, and cross-connect board channels are available. Navigation Path: In the NE Explorer, select a board and choose Configuration > PRBS Test from the Function Tree.
	Performing a Loopback	You can perform loopback tests, a common fault diagnosis function, including: Setting a Loopback for an SDH Interface Setting a Loopback for a PDH Interface Setting a Loopback for an Ethernet Interface Setting a Loopback for an IF Interface Setting a Loopback for an ODU Interface Setting a Loopback for a Digital Interface Setting a Loopback for a VC4 Path Setting a Loopback for a VC3 Path Setting Loopback for the Microwave Link	Loopback needs to be set for NEs on the U2000 Web LCT during NE fault diagnosis.
	Data Service Performance Test	VLAN-based E-Line services are tested with different frame lengths to learn the delay, throughput, packet loss rate, and long-term packet loss rate of these services.	When packet loss or other issues occur on E-Line services, engineers can perform data service performance tests to check the packet loss rate.