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300-415 · Question #163

300-415 Question #163: Real Exam Question with Answer & Explanation

The correct answer is A: Image showing Tunnel configuration with 'Tunnel Interface' On, 'Color' mpls, 'Restrict' On, 'Maximum Control Connections' default (not 0), 'vBond as Stun Server' On, 'Exclude Controller Group List' selected, 'vManage Connection Preference' 5, 'Port Hop' On, 'Low-Bandwidth Link' On.. To establish BFD neighbors, a TLOC's tunnel interface must be configured to allow control plane connections, enabling it to participate in the SD-WAN overlay.

Question

Company E wants to deploy Cisco SD-WAN with controllers in AWS. The company's existing WAN is on private MPLS without Internet access to controllers in AWS. An Internet circuit is added to a site in addition to the existing MPLS circuit. Which interface template establishes BFD neighbors over both transports?

Options

  • AImage showing Tunnel configuration with 'Tunnel Interface' On, 'Color' mpls, 'Restrict' On, 'Maximum Control Connections' default (not 0), 'vBond as Stun Server' On, 'Exclude Controller Group List' selected, 'vManage Connection Preference' 5, 'Port Hop' On, 'Low-Bandwidth Link' On.
  • BImage showing Tunnel configuration with 'Tunnel Interface' On, 'Color' mpls, 'Restrict' Off, 'Maximum Control Connections' 0, 'vBond as Stun Server' On, 'Exclude Controller Group List' selected, 'vManage Connection Preference' 5, 'Port Hop' On, 'Low-Bandwidth Link' On.

Explanation

To establish BFD neighbors, a TLOC's tunnel interface must be configured to allow control plane connections, enabling it to participate in the SD-WAN overlay.

Common mistakes.

  • B. Setting 'Maximum Control Connections' to 0 prevents this TLOC from establishing any control plane connections, which makes it unable to fully participate in the SD-WAN overlay and establish BFD data plane tunnels.

Concept tested. SD-WAN TLOC tunnel configuration for BFD and control plane

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-interface-configuration.html

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