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300-415 · Question #289

Refer to the exhibit. An engineer must configure a QoS policy between the hub and site A (spoke) over a standard Internet circuit where traffic shaping is adjusted based on available bandwidth…

The correct answer is D. Site A (Spoke) sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 10000 downstream range 8000 12000 upstream 9000 upstream range 5000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service all. The correct configuration enables adaptive QoS on the Spoke router's public-internet tunnel interface, allowing traffic shaping to dynamically adjust its bandwidth based on real-time network conditions within specified upstream and downstream ranges.

Security and Quality of Service

Question

Refer to the exhibit. An engineer must configure a QoS policy between the hub and site A (spoke) over a standard Internet circuit where traffic shaping is adjusted based on available bandwidth. Which configuration meets the requirement?

Options

  • AHub sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 8000 downstream range 6000 10000 upstream 8000 upstream range 4000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service all
  • BHub sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 10000 downstream range 8000 12000 upstream 9000 upstream range 5000 16000 exit tunnel-interface encapsulation ipsec weight 1 color mpls no last-resort-circuit vmanage-connection-preference 5 allow-service all
  • CSite A (Spoke) sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 8000 downstream range 6000 10000 upstream 8000 upstream range 4000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service all
  • DSite A (Spoke) sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 10000 downstream range 8000 12000 upstream 9000 upstream range 5000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service all

How the community answered

(39 responses)
  • A
    3% (1)
  • B
    5% (2)
  • C
    10% (4)
  • D
    82% (32)

Why each option

The correct configuration enables adaptive QoS on the Spoke router's public-internet tunnel interface, allowing traffic shaping to dynamically adjust its bandwidth based on real-time network conditions within specified upstream and downstream ranges.

AHub sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 8000 downstream range 6000 10000 upstream 8000 upstream range 4000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service all

This configuration is applied to the `Hub` router, but the requirement specifies configuring a QoS policy 'between the hub and site A (spoke)' where the adaptive shaping is typically applied on the spoke's internet circuit.

BHub sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 10000 downstream range 8000 12000 upstream 9000 upstream range 5000 16000 exit tunnel-interface encapsulation ipsec weight 1 color mpls no last-resort-circuit vmanage-connection-preference 5 allow-service all

This configuration is applied to the `Hub` router and uses the `mpls` color, which does not match the requirement for a 'standard Internet circuit' for Site A (spoke).

CSite A (Spoke) sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 8000 downstream range 6000 10000 upstream 8000 upstream range 4000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service all

While applied to `Site A (Spoke)` and using `public-internet` color, the specific `downstream` and `upstream` bandwidth values and ranges differ from the intended correct answer. Without an exhibit, the precise numerical values are arbitrary, but D is the designated correct option for this scenario.

DSite A (Spoke) sdwan interface GigabitEthernet1 qos-adaptive period 90 downstream 10000 downstream range 8000 12000 upstream 9000 upstream range 5000 16000 exit tunnel-interface encapsulation ipsec weight 1 color public-internet no last-resort-circuit vmanage-connection-preference 5 allow-service allCorrect

This configuration applies `qos-adaptive` to `Site A (Spoke)` on the `public-internet` color tunnel interface, directly fulfilling the requirement for a QoS policy between the hub and a spoke over a standard Internet circuit with traffic shaping adjusted based on available bandwidth. The `qos-adaptive` command with defined `downstream` and `upstream` values and `range` enables dynamic bandwidth adjustment.

Concept tested: Cisco SD-WAN adaptive QoS on spokes

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos-book/sdwan-qos-book_chapter_010.html

Topics

#SD-WAN QoS#Adaptive QoS#WAN Edge Configuration#Tunnel Interface

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