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Why QoS EF packet loss occurring without congestion when link switchover

Publication Date:  2012-07-27 Views:  113 Downloads:  1

Issue Description

QoS EF packet loss occurring when link switchover but from DMS performance picture checking, there is no congestion.

Alarm Information

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Handling Process

When use command line to check the PoS link usage each 10 seconds, we find there is congeston in the link which cause the EF packet loss.
For the detail please check the attachment.

Root Cause

The QoS queuing drops packets only when the queuing faces congestion, no matter with the PoS link up/down. The DMS can just detect the link usage each 30 minutes. So from DMS performance picture we can not see the congestion. But when use command line to check the link usage each 10 seconds, we find there is congeston in the link.

Suggestions

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