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300-415 · Question #186

Refer to the exhibit showing a network diagram with Customer XYZ, R1, R2, INET, MPLS, and a TLOC Extension. Customer XYZ cannot provision dual connectivity on both of its routers due to budget…

The correct answer is A. R1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.1/30 tunnel-interface color mpls R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0. To enable load balancing for users across two routers without dual WAN connectivity on each, TLOC extension is utilized to share a tunnel interface from one router to another local router's non-tunnel interface.

WAN Edge Router Deployment

Question

Refer to the exhibit showing a network diagram with Customer XYZ, R1, R2, INET, MPLS, and a TLOC Extension. Customer XYZ cannot provision dual connectivity on both of its routers due to budget constraints but wants to use both R1 and R2 interfaces for users behind them for load balancing toward the hub site. Which configuration achieves this objective?

Exhibit

300-415 question #186 exhibit

Options

  • AR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.1/30 tunnel-interface color mpls R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0
  • BR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0 R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.1/30
  • CR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0 R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.1/30
  • DR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0 R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.1/30

How the community answered

(47 responses)
  • A
    83% (39)
  • B
    2% (1)
  • C
    6% (3)
  • D
    9% (4)

Why each option

To enable load balancing for users across two routers without dual WAN connectivity on each, TLOC extension is utilized to share a tunnel interface from one router to another local router's non-tunnel interface.

AR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.1/30 tunnel-interface color mpls R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0Correct

This configuration correctly implements TLOC extension, allowing R1's ge0/2 to extend a TLOC to R2's ge0/0, and R2's ge0/3 to extend a TLOC to R1's ge0/0. This setup enables both R1 and R2 to share the available WAN links (MPLS on R1's ge0/3 and Public-Internet on R2's ge0/2), facilitating load balancing of traffic from devices behind them by virtually extending the tunnel interfaces.

BR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0 R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.1/30

R1's ge0/3 is configured with 'tloc-extension ge0/0' but lacks the 'tunnel-interface' keyword and a color, which is incorrect for either a direct WAN connection or a proper TLOC extension. Additionally, R2's ge0/3 is unconfigured for tunnel or TLOC extension.

CR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0 R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.1/30

This option is identical to B, making it incorrect because R1's ge0/3 is missing the 'tunnel-interface' keyword and a color, which is essential for a WAN connection.

DR1 interface ge0/2 ip address 43.43.43.2/30 tloc-extension ge0/0 interface ge0/3 ip address 34.34.34.2/30 tloc-extension ge0/0 R2 interface ge0/2 ip address 43.43.43.1/30 tunnel-interface color public-internet interface ge0/3 ip address 34.34.34.1/30

This option is identical to B and C, and is incorrect for the same reasons that R1's ge0/3 lacks the necessary 'tunnel-interface' keyword and color configuration.

Concept tested: Cisco SD-WAN TLOC extension for load balancing

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-tloc-extension.html

Topics

#SD-WAN TLOC Extension#WAN Edge Deployment#Multi-homing#Load Balancing

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