The CPU overload control policy is not configured on the MA5600T. As a result, not all packets necessary for filtering are filtered out during the running of the live network and therefore the equipment CPU is overloaded in specific scenarios.
Product Model: MA5600T PCN/FN ID: N/A
If packets flood the CPU of the MA5600T, the CPU usage may reach 100%, causing service board reset and NMS unreachablility.
Generally, the CPU is able to process a limited number of service packets per second. In case of packet flooding, the CPU usage increases. After the CPU usage reaches 100%, the system failed to handle new packets from service boards and the communication between the control board and service boards is interrupted. Also, the device fails to be managed by the NMS and fails to be pinged. To ensure proper operation of the CPU, packets must be controlled according to the CPU usage so that important packets can be processed and the device can be properly managed.
[Impact and Risks]
The system is unreachable and services are interrupted.
[Measures and Solutions]
Currently, required patches for preventing CPU overload have been released to ensure that the devices are functioning properly in case of concurrent massive dialup or packet flooding:
V800R52SPC020: The number of PPPoE and DHCP dial-up packets is under control according to the CPU usage.
V800R62SPC118 and V800R007C00SPC307: Packets are dynamically controlled if the CPU usage keeps being higher than 80%, ensuring that the packets and tasks with high priority can be scheduled and the CPU usage is not too high.
You are advised to upgrade the involved versions on the live network to versions later than the versions above.
[Rectification Scope and Time Requirements]
This notice automatically expires after related patches are loaded.
Global Technical Assistance Center: Gong Huaimin (employee ID: 00055818)
Huawei Headquarters service maintenance representative: Feng Bo (employee ID: 000466624)
R&D of the MA5600T: Zhang Yanhua (employee ID: 0067881)
Approved by: Zou Yuelin (employee ID: 00066579)