Question

A service provider is deploying a QoS policy on an IOS XR aggregation router carrying both voice (VoIP) and best-effort internet traffic. The design team wants to guarantee that VoIP experiences minimal latency and jitter even during periods of congestion, while ensuring the voice queue cannot completely starve other traffic classes indefinitely. Which QoS architectural mechanism best meets these requirements?

Accepted Answer

Apply a low-latency queue (priority level 1) to the VoIP class combined with a policer to cap the priority traffic rate

Answer

Assign the VoIP class a class-based weighted fair queue (CBWFQ) with a high bandwidth percent value

Answer

Configure WRED on the VoIP class to drop packets before the queue fills

Answer

Use a shaper on the best-effort class so the VoIP class always receives the remaining bandwidth