When configuring LLQ (strict priority queue) on a traffic class using the Cisco IOS XR priority
command on a Cisco ASR9K router, which additional QoS command is required for this traffic
class?
A.
shape
B.
police
C.
random-detect
D.
bandwidth
Explanation:
The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair
Queueing(CBWFQ).
Configuring Low-Latency Queueing with Strict Priority Queueing
The priority command configures low-latency queueing (LLQ), providing strict priority queueing (PQ). Strict PQ allows delay-sensitive data, such as voice, to be dequeued and sent before packets in other queues are dequeued. When a class is marked as high priority using the priority command, we recommend that you configure a policer to limit the priority traffic. This configuration ensures that the priority traffic does not starve all of the other traffic on the line card, which protects low priority traffic from starvation. Use the police command to explicitly configure the policer.