[Case Show] ONT Configuration Status Is Abnormal When VLAN ID Is Set to 0

Procedure

1. Check the operation log. It is found that no error prompt or alarm is displayed during the configuration.
2. Check the line profile. It is found that the line profile is correct.
3. Run the display ont port vlan command to query the ONT port VLAN. It is found that the port VLAN of an ONT port is set to 0. It is suspected that this port VLAN causes the problem.
4. Run the undo ont port vlan 0 command to delete port VLAN 0. It is found that Config state of the ONT becomes normal. Then, run the ont port vlan command to add port VLAN 0. It is found that Config state of the ONT is failed again. Therefore, it can be determined that the ONT port does not support VLAN 0.
5. Query the value range of the port VLAN in the system. It is found that the value range of the port VLAN is 0 to 4095. Therefore, it is suspected that ONT ports do not support boundary VLAN IDs. Set the port VLAN to other boundary values, such as 4094 and 4095. Config state of the ONT is still normal.