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300-415 · Question #353

Refer to the exhibit. A user has selected the options while configuring a VPN Interface Ethernet feature template. The exhibit shows a "TUNNEL" configuration with "Tunnel Interface" (On)…

The correct answer is C. The "Bandwidth Downstream" field must be configured with a value. When Per-tunnel QoS Aggregator is enabled on a VPN Interface Ethernet feature template, the Bandwidth Downstream field must be configured to define the downstream capacity used for QoS shaping calculations.

Security and Quality of Service

Question

Refer to the exhibit. A user has selected the options while configuring a VPN Interface Ethernet feature template. The exhibit shows a "TUNNEL" configuration with "Tunnel Interface" (On), "Per-tunnel QoS" (On), and "Per-tunnel QoS Aggregator" (On). What is the required configuration parameter the user must set in this template for this feature to function?

Options

  • AThe "Shaping Rate (Kbps)" field must be configured with a value.
  • BThe "IP MTU" field must be increased from the default value of 1500 to support the additional overhead.
  • CThe "Bandwidth Downstream" field must be configured with a value.
  • DThe "Adaptive QoS" field must be set to "on".

How the community answered

(33 responses)
  • A
    9% (3)
  • B
    3% (1)
  • C
    85% (28)
  • D
    3% (1)

Why each option

When Per-tunnel QoS Aggregator is enabled on a VPN Interface Ethernet feature template, the Bandwidth Downstream field must be configured to define the downstream capacity used for QoS shaping calculations.

AThe "Shaping Rate (Kbps)" field must be configured with a value.

The 'Shaping Rate (Kbps)' field is not a required parameter for Per-tunnel QoS Aggregator; the downstream bandwidth value is what drives the shaping calculation.

BThe "IP MTU" field must be increased from the default value of 1500 to support the additional overhead.

Increasing IP MTU above 1500 addresses tunnel overhead handling and is not a mandatory requirement for enabling Per-tunnel QoS Aggregator functionality.

CThe "Bandwidth Downstream" field must be configured with a value.Correct

The 'Bandwidth Downstream' field is mandatory when Per-tunnel QoS Aggregator is enabled, as it tells the system the downstream bandwidth capacity of the tunnel. This value is used to calculate and enforce per-tunnel QoS shaping rates, and without it the aggregator feature cannot function correctly.

DThe "Adaptive QoS" field must be set to "on".

The 'Adaptive QoS' field is a separate optional feature that dynamically adjusts shaping rates and is not required for Per-tunnel QoS Aggregator to function.

Concept tested: Per-tunnel QoS Aggregator bandwidth downstream configuration requirement

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos/ios-xe-17/qos-book-xe/per-tunnel-qos.html

Topics

#Cisco SD-WAN#Quality of Service (QoS)#VPN Interface Configuration#Feature Templates

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