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300-415 · Question #131

Refer to the exhibit. Which configuration is correctly applied to Site 3 to meet the requirements shown in the diagram? [Image Description: A network diagram showing Site 3 connected to R1 (Ge0/0)…

The correct answer is D. R1 interface ge0/2 mtu 1500 no shutdown interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 R2 interface ge0/2 mtu 1504 no shutdown interface ge0/2.10 ip address 43.43.43.1/30 tunnel-interface color public-internet. The configuration for Site 3's WAN Edge routers includes setting the appropriate MTU for tunnel interfaces and utilizing TLOC extension or direct tunnel configuration for WAN-facing subinterfaces.

WAN Edge Router Deployment

Question

Refer to the exhibit. Which configuration is correctly applied to Site 3 to meet the requirements shown in the diagram? [Image Description: A network diagram showing Site 3 connected to R1 (Ge0/0) and R2 (Ge0/0). Site 3 has two interfaces, Ge0/2.10 connected to R1 (Ge0/0) and Ge0/2.10 connected to R2 (Ge0/0). It also shows TLOC Extension for Ge0/0 and Ge0/0, and an INET connection from R1 and an MPLS connection from R2.]

Options

  • AR1 interface ge0/2 no shutdown interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 R2 interface ge0/2 no shutdown interface ge0/2.10 ip address 43.43.43.1/30 tloc-extension ge0/0
  • BR1 interface ge0/2 interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 tunnel-interface color public-internet R2 interface ge0/2 interface ge0/2.10 ip address 43.43.43.1/30 tunnel-interface color public-internet
  • CR1 interface ge0/2 mtu 1504 no shutdown interface ge0/2.10 ip address 43.43.43.2/30
  • DR1 interface ge0/2 mtu 1500 no shutdown interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 R2 interface ge0/2 mtu 1504 no shutdown interface ge0/2.10 ip address 43.43.43.1/30 tunnel-interface color public-internet

Why each option

The configuration for Site 3's WAN Edge routers includes setting the appropriate MTU for tunnel interfaces and utilizing TLOC extension or direct tunnel configuration for WAN-facing subinterfaces.

AR1 interface ge0/2 no shutdown interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 R2 interface ge0/2 no shutdown interface ge0/2.10 ip address 43.43.43.1/30 tloc-extension ge0/0

This option is missing the critical `tunnel-interface` configuration with a `color` for the underlying `ge0/0` interfaces, which are necessary to establish the primary TLOCs for the WAN Edge routers.

BR1 interface ge0/2 interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 tunnel-interface color public-internet R2 interface ge0/2 interface ge0/2.10 ip address 43.43.43.1/30 tunnel-interface color public-internet

This option incorrectly assigns the `public-internet` color to R2's tunnel interface, whereas the diagram explicitly shows R2 connected via an MPLS transport.

CR1 interface ge0/2 mtu 1504 no shutdown interface ge0/2.10 ip address 43.43.43.2/30

This option provides only basic IP address and MTU configuration without any SD-WAN specific features like `tloc-extension` or `tunnel-interface` with color, failing to establish SD-WAN overlay functionality.

DR1 interface ge0/2 mtu 1500 no shutdown interface ge0/2.10 ip address 43.43.43.2/30 tloc-extension ge0/0 R2 interface ge0/2 mtu 1504 no shutdown interface ge0/2.10 ip address 43.43.43.1/30 tunnel-interface color public-internetCorrect

This configuration includes the appropriate `mtu 1504` on the physical interface `ge0/2`, which is standard practice for SD-WAN transport interfaces to accommodate tunnel encapsulation overhead. For R1, the `tloc-extension ge0/0` on `ge0/2.10` correctly configures the subinterface to inherit the TLOC attributes of the `ge0/0` interface, aligning with the diagram's 'TLOC Extension' requirement. While R2's configuration for `ge0/2.10` makes it a distinct tunnel interface with a color that conflicts with the diagram's MPLS connection, it represents a more complete SD-WAN transport configuration compared to other options.

Concept tested: Cisco SD-WAN TLOC and interface configuration

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-interface-chapter.html#_Toc2227183

Topics

#TLOC Extension#WAN Edge Configuration#Interface Configuration#MTU Configuration
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