A lot of PPPoE users connected to an ME60 suddenly go offline.
Users are connected to the ME60 for Internet access through PPPoE dialup. Aggregation switches are deployed with QinQ to access the network.
Terminal--ONU-OLT-aggregation switch—core switch--ME60
QinQ encapsulation is performed for user packets on the OLT. The ME60 implements QinQ termination.
1. Run the disp aaa online-fail mac H-H-H command on the ME60 to check the causes of the user online failure. No command output is available. It is suspected that packets are not successfully forwarded to the ME60.
2. View MAC entries on the OLT. It is found that the MAC address of the terminal is in the corresponding service VLAN. This indicates that user authentication packets are successfully sent to the OLT.
3. View MAC entries on the core switch. It is found that the MAC address of the terminal exists and the outer VLAN ID is correct. This indicates that packets can be successfully forwarded to core devices.
4. Run the trace access-user object 1 mac-address H-H-H command on the ME60. No command output is available. It is suspected that the switch does not send the authentication request to the ME60.
5. Check the upstream interface configuration on the core switch. It is found that the configuration on the upstream interface is inconsistent with that on the ME60. After the configuration on the upstream interface is changed to be consistent with that on the ME60, trace information can be properly printed. This indicates that an IP address is obtained and the user successfully goes online.
Other on-site engineers may have modified the configuration of the upstream interface and changed interfaces. As a result, the VLAN configuration on the interface is inconsistent with that on the ME60.