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Interconnection Between the OptiX OSN Equipment and Huawei Switch

Publication Date:  2012-07-25 Views:  65 Downloads:  0
Issue Description
Four OptiX OSN NEs form two chains to connect four Huawei switches into a ring. At one end, two Huawei Quidway S6506 switches are deployed. At the other end, two Huawei Quidway S3528 switches are configured. After the STP protocol is started on the switches, the network is divided into two domains. Check the packet count on the interface of a switch. It is found that packet loss exists. 
Alarm Information
Handling Process
1. Discuss the fault with the data communication engineers. It is found that the STP protocols are classified into three types: MSTP, RSTP, and STP. In theory, MSTP, RSTP, and STP are backward compatible. That is, the STP packets can be transported transparently through RSTP and MSTP. The RSTP packets can be transported transparently through MSTP.
2. See the documents on the OptiX OSN equipment. It is found that the equipment supports only RSTP and STP and cannot work with MSTP currently. This is a defect of the Ethernet boards on the OptiX OSN equipment.
3. Advise the data communication engineers to run RSTP. The fault is rectified. 
Root Cause
There are packet sending records but not packet receiving records on the switches. Therefore, it is considered that the packets are discarded on the transport equipment. 
Considering the backward compatibility between MSTP, RSTP, and STP, the Ethernet equipment runs MSTP by default. Due to the defect, however, the Ethernet boards on the OptiX OSN equipment cannot transport MSTP packets transparently. Therefore, the STP setting on the Ethernet equipment needs to be changed. To avoid a backlash from the customer, do not explain the compatibility between MSTP and RSTP to the customer. Inform the customer that Huawei OptiX OSN equipment does not support MSTP.