300-415 Question 139
Single answerYou are configuring TLOCs for a Cisco SD-WAN deployment. The network has three transport types: MPLS, Internet, and LTE. You need to ensure that specific traffic flows are sent over MPLS by default but can fail over to Internet or LTE if MPLS is unavailable. Which configuration step is necessary to achieve this requirement?
- A
Configure MPLS TLOC with a higher preference value than Internet and LTE TLOCs.
- B
Assign a lower weight to the MPLS TLOC in comparison to Internet and LTE TLOCs.
- C
Configure MPLS as the primary TLOC and Internet and LTE as backup TLOCs using the 'color' parameter.
- D
Set the 'control connection preference' on the MPLS TLOC to prioritize control traffic.
Show answer and explanation
Correct answer: A
Explanation
To meet the requirement of using MPLS by default and failing over to Internet or LTE only when MPLS is unavailable, the MPLS TLOC must be configured with a higher preference value. The TLOC preference parameter directly controls the priority of transport selection, ensuring MPLS is used first, and other TLOCs are only utilized as failover options.
- A. Correct.
Correct: TLOC preference determines which transport is used first. A higher preference value on the MPLS TLOC ensures it is the primary path, while lower-preference TLOCs (Internet and LTE) act as failover options.
- B. Incorrect.
Incorrect: TLOC weight is used for load balancing between multiple TLOCs with the same preference, not for prioritizing one transport over another.
- C. Incorrect.
Incorrect: The 'color' parameter is used to identify the transport type but does not define primary and backup priorities between TLOCs.
- D. Incorrect.
Incorrect: The 'control connection preference' setting is used to prioritize control plane traffic, not data traffic, and does not affect TLOC failover behavior.