Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 862
Displaying WRED Drop Statistics, Explicit Congestion Notification
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Displaying WRED Drop Statistics To display WRED drop statistics, use the following command. • Display the number of packets that the WRED profile drops. EXEC Privilege mode show qos statistics Examples of the show qos statistics Commands The following shows the show qos statistics output. Dell# show qos statitstics wred-profile WInterface Te 0/49 Drop-statistic Dropped Pkts Green 51624 Yellow 51300 Out of Profile 0 The following shows the show qos statistics output on the port extender. DELL#show qos statistics peGigE 0/1/1 Interface peGigE 0/1/1 Queue# Matched Pkts 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 DELL#show qos statistics wred-profile peGigE 0/1/1 Interface peGigE 0/1/1 Drop-statistic Dropped Pkts Green 0 Yellow 0 Out of Profile 0 Displaying egress-queue Statistics To display the number of transmitted and dropped packets on the egress queues of a WRED-configured interface, use the following command. • Display the number of packets and number of bytes on the egress-queue profile. EXEC Privilege mode show qos statistics egress-queue Explicit Congestion Notification Explicit Congestion Notification (ECN) enhances and extends WRED functionality by marking packets for later transmission instead of dropping them when a threshold value is exceeded. Use ECN for WRED to reduce the packet transmission rate in a congested, heavily-loaded network. While WRED drops packets to indicate congestion, ECN marks packets instead of dropping them when the average queue length exceeds the threshold value. ECN provides an improved method for 862 Quality of Service (QoS)
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