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Knowledge Base

The Negotiation of AR46 Router and Transmission Device of Z Corporation is Inconsistent and Packet is Dropped

Publication Date:  2012-07-27  |   Views:  108  |   Downloads:  0  |   Author:  Qin Xuetao  |   Document ID:  EKB0000203214


Issue Description

S8505 switch---Huawei MSTP transmission device---MSTP transmission device of Z corporation---AR46-80 router
Have ping test between S8505 switch and AR46-80 router. There are dropped packets and loss rate is not stable. When the service is small, there is no loss. When the service is large, there is much loss and the rate reaches 5%.

Alarm Information


Handling Process

1、Change self-negotiation mode of interconnected Ethernet interface on AR46-80 router and S8505 switch as forced MB full-duplex and have ping test. There is still loss.
2、Ping S8505 switch from Huawei MSTP transmission device and there is no loss.
3、Ping AR46-80 router from MSTP transmission device of Z corporation and there is loss.
4、Check interconnected Ethernet interface of MSTP transmission device of Z corporation and AR46-80 router. The interface is self-negotiation. Change it as forced MB full-duplex. And then there is no loss. The problem is solved.

Root Cause

Ethernet interface of each device is self-negotiation mode under default. The interconnection of devices is problematic, it is possible that  the interface negotiation of AR46-80 router and MSTP transmission device of Z corporation is inconsistent and there is loss.


Notice negotiation of transmission device when network devices are connected through transmission device.