Home » Juniper » JN0-661 » Which action would solve this problem?
You have a strict-high queue configured. You notice that under bursty traffic conditions, there are tail drops on the strict-high queue.
Which action would solve this problem?
A. Assign a policer on ingress to assign a low packet loss priority to the strict-high queue.
B. Decrease the buffer size of the strict-high queue.
C. Assign a policer on egress to assign a low packet loss priority to the strict-high queue.
D. Increase the buffer size of the strict-high queue.
Correct Answer: D
Explanation/Reference:
A queue with strict-high priority is assured unlimited transmission bandwidth but is not actually assigned a large delay buffer. Not configuring a transmitrate or an explicit buffer-size on a strict-high priority queue only ensures that the queue gets assigned a default minimum delay buffer, making it possible, under bursty conditions, to see tail-drops on strict-high priority queues. Assigning a small transmit-rate or an explicit temporal or percentage buffer-size to the queue ensures that the queue has a large enough buffer to hold bursts and protect against tail-drops.
References: http://www.juniper.net/documentation/en_US/junos15.1/topics/usage-guidelines/cos-configuring-schedulers-for-priority-scheduling.html
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