300-415 Question #398: Real Exam Question with Answer & Explanation

The correct answer is B: system on-demand enable. To enable dynamic tunnels for direct communication between spokes that tear down after a call, both the on-demand tunnel feature and an idle-timeout must be configured.

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Question

Refer to the exhibit. The users establish a tunnel between branch A and B to communicate directly during video calls. The tunnel must go down after the call is complete. Which two configurations must be applied on the spokes to meet this requirement? (Choose two.)

Options

Aomp send-path-limit 16
Bsystem on-demand enable
Cvpn 0 service TE
Dsystem on-demand idle-timeout 10
Eomp ecmp-limit 16

Explanation

To enable dynamic tunnels for direct communication between spokes that tear down after a call, both the on-demand tunnel feature and an idle-timeout must be configured.

Common mistakes.

A. omp send-path-limit 16 controls the number of TLOC paths advertised for vRoutes to the vSmart controller, which is not related to on-demand tunnel behavior.
C. vpn 0 service TE configures traffic engineering within VPN 0, which is distinct from the dynamic on-demand tunnel establishment and teardown requirement.
E. omp ecmp-limit 16 sets the maximum number of equal-cost paths for traffic forwarding, not the parameters for on-demand tunnel creation or expiry.

Concept tested. Cisco SD-WAN On-Demand Spoke-to-Spoke Tunnels

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/system-interfaces/ios-xe-17/system-interfaces-book-xe/m-tunnel-interface-parameters.html

Topics

#SD-WAN tunnels#On-demand tunnels#Tunnel lifecycle#Spoke configuration

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