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Testing the Throughput and Packet Loss Ratio of the Upstream Port Is Abnormal After the Unknown Unicast Suppression on the Upstream Port of the MA5680T Is Enabled

Publication Date:  2012-07-25 Views:  38 Downloads:  0
Issue Description
Networking description:
--(port 1) SmartBits (port 5)---ONT―Optical splitter--(EPBA) MA5680T (GICE)---
Purpose: To test the throughput of the upstream port on the MA5680T.
Problem description: The SmartBits transmits 100 M unicast traffic from port 1. Through the GICE upstream port of the MA5680T and the ONT, the unicast traffic is received by port 5 of the SmartBits. The traffic received, however, becomes 9 M. 
Alarm Information
Handling Process
1. It was believed that the rate was limited in the configuration. After the check, however, it is found that no related rate limit is configured, and the ports are in the 100 M full-duplex mode.
2. Replace the control board. It is found that the problem persists. Therefore, the problem is not caused by the hardware.
3. After the careful check and analysis, it is found that after the SmartBits transmits the unicast traffic from port 1, because the MAC address of port 5 of the SmartBits is not learned by the MA5600T, the MA5600T processes the unicast packets as the unknown unicast packets. The default bandwidth is 9 Mbit/s for the suppressed unknown unicast packets on the upstream port of the MA5680T, so port 5 of the SmartBits can receive only 9 M traffic.
Solution: The problem can be solved when the MA5680T learns the MAC address of port 5. For this purpose, enable the port 5 of the SmartBits to transmit a unicast stream. In addition, you can solve this problem by disabling the unknown unicast suppression function of the upstream port. 

Root Cause
1. The configuration is incorrect.
2. The hardware is faulty.
3. Other causes.