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300-415 · Question #374

Refer to the exhibit. An engineer must use the existing configurations of the Spoke1 site and build a new one for the Spoke2 site Which configuration establishes the SD-WAN underlay connectivity?

The correct answer is D. system system-ip 10.0.0.102 site-id 10 admin-tech-on-failure organization-name abc vbond 100.0.0.9 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6 ! interface GigabitEthernet1 description MPLS Network *** no shutdown ip address 100.0.0.5 255.255.255.252 ! interface Tunnel1 no shutdown ip unnumbered GigabitEthernet1 tunnel source GigabitEthernet1 tunnel mode sdwan ! sdwan interface GigabitEthernet1 tunnel-interface encapsulation ipsec color mpls no allow-service all. SD-WAN underlay connectivity for a WAN Edge device requires basic system parameters, interface configuration, a default route, and specifically, the sdwan interface configuration with tunnel-interface and color to establish control and data plane tunnels.

WAN Edge Router Deployment

Question

Refer to the exhibit. An engineer must use the existing configurations of the Spoke1 site and build a new one for the Spoke2 site Which configuration establishes the SD-WAN underlay connectivity?

Exhibit

300-415 question #374 exhibit

Options

  • Asystem system-ip 10.0.0.102 site-id 10 admin-tech-on-failure organization-name abc vbond 100.0.0.9 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6 ! interface GigabitEthernet1 description MPLS Network *** no shutdown ip address 100.0.0.5 255.255.255.252
  • Bhostname cEdge2 ! interface GigabitEthernet1 description MPLS Network *** ip address 100.0.0.5 255.255.255.252 ! interface GigabitEthernet3 description Out Of Band Network *** ip address 100.0.0.3 255.255.255.0 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6
  • Chostname cEdge2 ! interface GigabitEthernet1 description MPLS Network *** ip address 100.0.0.5 255.255.255.252 ! interface GigabitEthernet3 description Out Of Band Network *** ip address 100.0.0.3 255.255.255.0 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6
  • Dsystem system-ip 10.0.0.102 site-id 10 admin-tech-on-failure organization-name abc vbond 100.0.0.9 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6 ! interface GigabitEthernet1 description MPLS Network *** no shutdown ip address 100.0.0.5 255.255.255.252 ! interface Tunnel1 no shutdown ip unnumbered GigabitEthernet1 tunnel source GigabitEthernet1 tunnel mode sdwan ! sdwan interface GigabitEthernet1 tunnel-interface encapsulation ipsec color mpls no allow-service all

How the community answered

(32 responses)
  • A
    3% (1)
  • B
    16% (5)
  • C
    9% (3)
  • D
    72% (23)

Why each option

SD-WAN underlay connectivity for a WAN Edge device requires basic system parameters, interface configuration, a default route, and specifically, the `sdwan` interface configuration with `tunnel-interface` and `color` to establish control and data plane tunnels.

Asystem system-ip 10.0.0.102 site-id 10 admin-tech-on-failure organization-name abc vbond 100.0.0.9 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6 ! interface GigabitEthernet1 description MPLS Network *** no shutdown ip address 100.0.0.5 255.255.255.252

This configuration is missing the `sdwan` specific interface configuration (`tunnel-interface` and `color`) and the `tunnel mode sdwan` which are essential for forming the SD-WAN overlay tunnels.

Bhostname cEdge2 ! interface GigabitEthernet1 description MPLS Network *** ip address 100.0.0.5 255.255.255.252 ! interface GigabitEthernet3 description Out Of Band Network *** ip address 100.0.0.3 255.255.255.0 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6

This configuration lacks the `system` block with SD-WAN specific parameters (system-ip, site-id, vbond) and the `sdwan` interface configuration, which are foundational for an SD-WAN device.

Chostname cEdge2 ! interface GigabitEthernet1 description MPLS Network *** ip address 100.0.0.5 255.255.255.252 ! interface GigabitEthernet3 description Out Of Band Network *** ip address 100.0.0.3 255.255.255.0 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6

This configuration is missing the `system` block and the `sdwan` interface configuration necessary for an SD-WAN WAN Edge device, similar to option B.

Dsystem system-ip 10.0.0.102 site-id 10 admin-tech-on-failure organization-name abc vbond 100.0.0.9 ! ip route 0.0.0.0 0.0.0.0 100.0.0.6 ! interface GigabitEthernet1 description MPLS Network *** no shutdown ip address 100.0.0.5 255.255.255.252 ! interface Tunnel1 no shutdown ip unnumbered GigabitEthernet1 tunnel source GigabitEthernet1 tunnel mode sdwan ! sdwan interface GigabitEthernet1 tunnel-interface encapsulation ipsec color mpls no allow-service allCorrect

This configuration snippet correctly establishes the SD-WAN underlay. It includes essential system parameters, configures a physical interface with an IP address, adds a default route for reachability, and crucially defines a `tunnel` interface in `sdwan` mode and marks the physical interface as a `tunnel-interface` with a `color`, which is necessary for forming IPsec tunnels and establishing control connections to the vSmart and vBond controllers.

Concept tested: SD-WAN WAN Edge underlay configuration

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

Topics

#WAN Edge Configuration#SD-WAN Underlay#Tunnel Interface#vBond Connectivity

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