350-501 · Question #82
Refer to the exhibit. Which statement supports QPPB implementation?
The correct answer is B. QoS policies rely exclusively on BGP attributes to manipulate traffic. QPPB (QoS Policy Propagation via BGP) is a Cisco feature that uses BGP attributes - specifically BGP community strings or AS-path information - to classify traffic and assign QoS policies at ingress. The router reads the BGP attributes associated with a destination prefix and…
Question
Refer to the exhibit. Which statement supports QPPB implementation?
Exhibit
Options
- AQoS policies are identified in the MPLS forwarding table
- BQoS policies rely exclusively on BGP attributes to manipulate traffic
- CQoS policies use BGP to gain full coverage on the network.
- DQPPB policies affect only egress traffic
How the community answered
(30 responses)- B93% (28)
- C3% (1)
- D3% (1)
Explanation
QPPB (QoS Policy Propagation via BGP) is a Cisco feature that uses BGP attributes - specifically BGP community strings or AS-path information - to classify traffic and assign QoS policies at ingress. The router reads the BGP attributes associated with a destination prefix and maps those to a QoS group, which then drives queuing and scheduling decisions. Therefore, QPPB does rely exclusively on BGP attributes to manipulate how traffic is treated. Option A is wrong because QPPB works off the BGP routing table, not the MPLS forwarding table. Option C overstates coverage. Option D is incorrect because QPPB is applied at ingress, not exclusively egress.
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