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300-415 · Question #118

A network administrator is configuring a centralized control policy based on match action pairs for multiple conditions. Which order must be configured to prefer Prefix List over TLOC and TLOC over…

The correct answer is D. lowest to highest sequence number. Centralized control policies in Cisco SD-WAN are configured with match-action pairs evaluated in order from the lowest to the highest sequence number.

Policies

Question

A network administrator is configuring a centralized control policy based on match action pairs for multiple conditions. Which order must be configured to prefer Prefix List over TLOC and TLOC over Origin?

Options

  • Ahighest to lowest sequence number
  • Bnonsequential order
  • Cdeterministic order
  • Dlowest to highest sequence number

How the community answered

(45 responses)
  • A
    4% (2)
  • B
    2% (1)
  • C
    2% (1)
  • D
    91% (41)

Why each option

Centralized control policies in Cisco SD-WAN are configured with match-action pairs evaluated in order from the lowest to the highest sequence number.

Ahighest to lowest sequence number

Processing from highest to lowest sequence number would reverse the intended precedence for policy evaluation.

Bnonsequential order

A nonsequential order would lead to unpredictable policy application and is not how Cisco SD-WAN control policies are evaluated.

Cdeterministic order

While the order is deterministic, this option does not specify the direction of evaluation (lowest to highest sequence number) which is crucial for precedence.

Dlowest to highest sequence numberCorrect

In Cisco SD-WAN centralized control policies, the evaluation of match-action pairs follows a deterministic order from the lowest to the highest sequence number. This ensures that more specific conditions, such as a Prefix List match, can be placed at lower sequence numbers to take precedence over broader matches like TLOC or Origin.

Concept tested: Centralized control policy sequence evaluation

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-centralized-control-policy.html

Topics

#SD-WAN Control Policy#Policy Sequence Number#Route Preference

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