which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?

When LLQ is being configured, which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?

When LLQ is being configured, which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?

A.
priority

B.
bandwidth

C.
queue-limit

D.
police

E.
hold-queue

Explanation:

bandwidth – Allows for the configuration of CBWFQ. The specifics of CBWFQ operation are beyond the scope of this explanation, but this command provides a minimum bandwidth guarantee to this class of traffic.
fair-queue – Not available in all classes. This command enables Flow-based Weighted Fair Queuing within this class.
police – Allows for the configuration of a policer, also known as rate limiting . The police command, when used within a class, is called class-based policing.
priority – Designates that this class is a Low Latency Queuing (LLQ) class, which should receive strict scheduling priority to minimize delay, jitter and packet loss. Also specifies the amount of bandwidth for this class.
queue-limit – Designates the maximum number of packets that can be in this queue.
random-detect – Enables Weighted Random Early Detection (WRED) for congestion avoidance. By default, IP precedence is used for weight determination, but additional options within this command allow for the WRED algorithm to look at the DSCP. This command also provides an option for enabling explicit congestion notification (ECN) on this class.
service-policy – Allows for the configuration of hierarchical policies (policy within a policy), which may be used to achieve functionality not possible in a single policy. For example, a T1 can be shaped to 512 kbps via a top-level policy, and then that 512 kbps can be divided (using CBWFQ/LLQ) within a second-level policy.



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Marv

Marv

I disagree. This answer should be A. Priority. Read the provided definition of the priority command from the included text:

“priority – Designates that this class is a Low Latency Queuing (LLQ) class, which should receive strict scheduling priority to minimize delay, jitter and packet loss. Also specifies the amount of bandwidth for this class.”

The ‘priority [kbps] commands designates a max bandwidth it will receive too. Meets all the requirements of the question best.

Marco Marzetti

Marco Marzetti

I agree with Marv.
Answer is A since the policer is a built-in feature of that command

Marco Marzetti

Marco Marzetti

I’m so sorry that I was wrong.
Since the built-in policer is CONGESTION AWARE, you must actually police if the queues are not full.

Right answer is D.