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Cisco Bug: CSCvt63039 - Packet loss may occur even if the traffic rate is very low.

Last Modified

Jun 18, 2020

Products (1)

  • Cisco vEdge Router

Known Affected Releases

19.2.2

Description (partial)

Symptom:
Packet loss may occur when configured qos-map even if the traffic rate is very low compared to calculated bandwidth.
This can be seen when qos-map has been applied to the interface and traffics are outgoing through LLQ(Low Latency Queue).

Conditions:
This can be seen when matched all following conditions.

- When traffics are outgoing through LLQ(Low Latency Queue).
- When LLQ qos-scheduler burst is configured and the value is under 5700. (default value: 15000)
- When the number of traffic is over 9.
- When the traffic rate is near 1 Mbps(0.6Mbps to 1.4Mbps).
- When configured QoS as following order.

1. policy class-map
2. policy qos-scheduler
3. policy qos-map
4. qos-map to interface
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  • Status
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