Hello, everyone!
MxU fails to go online because the upstream ETH port is configured in an Isolation Group. This is how to tackle this issue.
Problem diagnostic
The upstream port of an OLT is also used as the upstream port over the management channel of MxUs connected to the OLT. The OLT can access the Internet, but an MxU fails to go online. On the OLT, a user can access the MxU by using Telnet. The OLT and MxU can ping each other, but the MxU cannot ping the gateway.
Handling process
1. Check the MxU configuration. It is found that the MAC address of the MxU is special. Because some devices cannot ping the gateway because of special MAC addresses, the MAC address of the MxU may need to be changed.
Run the sysman MAC-Address command in diagnose mode to change the MAC address of the MxU. Then restart the MxU.
Note:
Generally, the MAC address of a Huawei device starts with 00-E0 which is a vendor ID. If the MAC address does not comply with specific rules, the device may fail to ping the gateway.
2. Check the upstream ETH port and upstream VLAN of the OLT. No configuration exception is found.
3. Check the service port of the MxU management channel. No abnormality is found.
4. Check the security settings of the OLT (such as firewall and MAC address filtering). No abnormality is found.
5. Verify all configurations related to MxU upstream transmission one by one. During a check on the ETH port, it is found that the port has been configured in an isolation group. After the isolation group is canceled, the MxU can go online.
6. View the online help and query information about an isolation group. The following information is found:
The isolate group command is used to configure an isolation group for a port or board. To solve the problem of insufficient MAC addresses, the MA5600T and MA5603T usually use the SVLAN+CVLAN forwarding mode and prohibit MAC address learning. This mechanism may cause a broadcast storm. To prevent a broadcast storm, run this command to configure an isolation group so that packets are flooded only within the isolation group. After this command is executed successfully, the ports or boards in the isolation group are isolated from each other and service packets cannot be forwarded between these ports or boards.
The undo isolate group command is used to delete a configured isolation group. After an isolation group is deleted, packets can be forwarded between ports or between a port and a board.
Thanks.
