An engineer set up a VoWLAN with QoS on the WLC and a class map on the switch, but the markings are not being preserved correctly in the end-to-end traffic flow. Which two configurations on the wired network ensure end-to-end QoS? (Choose two.)
Trust Boundaries (A):
Trust boundaries ensure that QoS markings (e.g., DSCP, CoS) are preserved as traffic flows through the network. If the switch or other network devices do not trust the markings from the wireless controller or endpoints, the QoS markings may be overwritten, leading to inconsistent QoS treatment.
For example, configure the switch port connected to the WLC to trust DSCP or CoS markings:
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interface GigabitEthernet1/0/1
switchport mode trunk
mls qos trust dscp
Policy Maps (C):
Policy maps define how traffic should be treated based on its QoS markings. They are used to enforce QoS policies, such as prioritizing voice traffic (e.g., marking DSCP EF for VoIP traffic) and ensuring consistent treatment across the network.
For example, create a policy map to prioritize voice traffic:
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policy-map VOICE-QOS
class VOICE
priority percent 20
Trust boundaries: By configuring trust boundaries, you can define which network devices should trust and prioritize the QoS markings from the VoWLAN traffic. This ensures that the QoS markings are preserved as the traffic flows through the wired network.
Policy maps: Policy maps allow you to define specific QoS policies for different traffic classes. By configuring a policy map on the switch, you can ensure that the correct QoS markings are applied to the VoWLAN traffic and preserved throughout the end-to-end traffic flow. This helps prioritize the VoWLAN traffic and ensure it receives the necessary bandwidth and quality of service.
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