Hello, everyone!
I will share one case about the ONT dialup failure 619 below.
Product Model
ONT HG8342M
Problem Description
Huawei ONT HG8342M is connected to the OLT of another vendor. The fault symptom is that the ONU fails to dial-up. The 619 and 628 data negotiation errors are displayed.
Problem Analysis
1. Check whether the lower-layer link is properly connected and whether the optical modem status indicator and OLT status are normal.
2. Check whether the account and password are correct. Use different PCs to perform the dialup test. The message "628." is still displayed.
3. Contact R&D engineers to locate the fault, Enter 192.168.100.1 in the address box of the browser to enter the ONT web page. Enter the account and password to enable the remote login function of the lan port.
Log in to the optical modem and enter collect debug info to collect error information, set ethportethportmirror sourceport 10 destport 1 mmirrordate enable 1
Obtains the packet header of a PON port. Note: The attachment is the PPPoE dialup failure interaction packet.
4. analyzes the PPPoE packet.
The physical address learning of the lan interface of the HG8342M is disabled. As a result, the dialup packets from the PON port cannot be forwarded according to the physical address, and then are forwarded in broadcast mode. Forwards the packets to the PC based on the broadcast table.
Therefore, after the PC sends the PADI packet in PPPoE mode, the server returns two PADO packets, which affects the judgment of the PC. Verification scheme: Create a bridge between the PC and HG8342M to filter the
After a packet is sent, the PC can dial-up.
5. After the optical fiber is removed and then inserted, the following information is displayed: After the HG8342M that is connected to the optical fiber of the OLT is not connected, the physical address can be viewed. After the physical address is inserted, the physical address disappears.
Root Cause
The optical modem cannot obtain the physical address. As a result, the packets replied by the server from the PON port cannot be forwarded according to the physical address table at Layer 2.
Solution Description
1. Enable the physical address learning capability of the ONT when the OLT is connected to the OLT.
2. Upgrade the software version of the optical modem. Preventive measures are taken in the new version, and physical learning is not disabled.
Suggestion
1. During the routine optical modem test, the fault analysis roadmap must be clear. The fault can be excluded from the bottom layer to Layer 3 protocols and packets to avoid missing points.
After each fault is rectified, the
2. can process the same fault. For example, if the fault is rectified, the
2. can obtain and analyze packets. The prerequisite is that each packet can be exchanged until the protocol interacts with each other.
Thank you.
