Implementing Cisco SD-WAN Solutions: Policy Application for Routing Path Influence

Policy Application for Routing Path Influence

Question

A policy is created to influence routing path in the network using a group of prefixes.

Which policy application will achieve this goal when applied to a site list?

Answers

Explanations

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A. B. C. D.

A.

https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/vedge/policies-book/control-policies.html

The correct answer is A. control-policy.

In Cisco SD-WAN, a control-policy is a type of policy that is used to influence routing and forwarding decisions for traffic within the SD-WAN fabric. Control policies are used to apply business intent, security policies, and application performance requirements to the SD-WAN fabric.

A control-policy can be applied to a site list, which is a collection of SD-WAN sites that share a common set of characteristics. When a control-policy is applied to a site list, it can influence the routing path for traffic that is destined to a group of prefixes that are associated with that site list.

For example, suppose that you have two SD-WAN sites, Site A and Site B, and you want to ensure that traffic destined for a group of prefixes, such as a set of public cloud applications, is always routed through Site A. To achieve this goal, you could create a control-policy that prioritizes Site A as the primary egress point for traffic destined to those prefixes. You could then apply the control-policy to a site list that includes Site A and Site B, and the SD-WAN fabric would automatically route traffic to those prefixes through Site A whenever possible.

In contrast, the other answer choices are not directly related to routing path selection for traffic within the SD-WAN fabric:

  • B. vpn-membership policy is used to determine which VPNs a site is a member of, and to define the policies and parameters for each VPN. It does not directly influence routing path selection.
  • C. app-route policy is used to map applications to specific paths or egress points in the SD-WAN fabric, based on application-specific requirements. It does not directly address routing path selection for a group of prefixes.
  • D. cflowd-template is used to define the parameters for exporting NetFlow data from the SD-WAN fabric to a collector device. It does not directly influence routing path selection.

Therefore, the correct answer is A. control-policy.