Cisco
300-415 · Question #249
300-415 Question #249: Real Exam Question with Answer & Explanation
The correct answer is B: Rectify issues with the underlay routing configuration.. Control connection failures on specific WAN circuits, like MPLS for a few branches, often indicate underlying routing problems in the physical network that prevent the WAN Edge devices from reaching the controllers.
WAN Edge Router Deployment
Question
Refer to the exhibit. Cisco SD-WAN is deployed with controllers hosted in a data center. All branches have WAN Edge devices with dual connections to the data center, one via internet and the other using MPLS. Three branches out of 20 have issues with their control connections on MPLS circuit. The local error refers to Control Connection Failure. Which action resolves the issue?
Options
- AUpdate the system IP on vManage and then resend it to the controllers.
- BRectify issues with the underlay routing configuration.
- CMatch the TLOC color on the controllers and all WAN Edge devices.
- DMath certificates for the DTLS connection and Root CA must be installed first on WAN Edge devices.
Explanation
Control connection failures on specific WAN circuits, like MPLS for a few branches, often indicate underlying routing problems in the physical network that prevent the WAN Edge devices from reaching the controllers.
Common mistakes.
- A. Updating the system IP on vManage and resending it to controllers is not a solution for control connection failures on specific circuits; system IP is typically stable and critical.
- C. TLOC colors are used for distinguishing transport types and are configured per interface, not typically 'matched on controllers'; mismatches would cause data plane issues rather than control plane reachability failure for a few specific branches.
- D. While certificates are crucial for DTLS connections, if the issue is only with some branches on a specific circuit, it's less likely a wholesale certificate problem (which would affect all branches or all circuits) and more likely a reachability issue.
Concept tested. Cisco SD-WAN control plane troubleshooting
Topics
#SD-WAN Control Plane#Troubleshooting#Underlay Network#MPLS
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