300-415 · Question #288
Refer to the exhibit. Which configuration must the engineer use to form underlay connectivity for the Cisco SD-WAN network?
The correct answer is B. Sequence Rule 1: Match Conditions (Originator: 0.0.0.0, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 0.0.0.0, Color List: Public_Internet), Actions (Accept, Preference: 333). To form underlay connectivity, the configuration defines sequence rules to accept TLOCs from any originator for specific transport colors (MPLS and Public_Internet) and assigns different preferences to prioritize MPLS over Public_Internet.
Question
Exhibit
Options
- ASequence Rule 1: Match Conditions (Originator: 10.2.2.2, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 10.2.2.2, Color List: Public_Internet), Actions (Accept, Preference: 333).
- BSequence Rule 1: Match Conditions (Originator: 0.0.0.0, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 0.0.0.0, Color List: Public_Internet), Actions (Accept, Preference: 333).
- CSequence Rule 1: Match Conditions (Originator: 0.0.0.0, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 0.0.0.0, Color List: Public_Internet), Actions (Accept, Preference: 333).
- DSequence Rule 1: Match Conditions (Originator: 10.10.10.10, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 10.10.10.10, Color List: Public_Internet), Actions (Accept, Preference: 333).
How the community answered
(57 responses)- A5% (3)
- B70% (40)
- C16% (9)
- D9% (5)
Why each option
To form underlay connectivity, the configuration defines sequence rules to accept TLOCs from any originator for specific transport colors (MPLS and Public_Internet) and assigns different preferences to prioritize MPLS over Public_Internet.
Matching a specific `Originator: 10.2.2.2` would only form tunnels with that particular TLOC, which is too restrictive for generally forming underlay connectivity across the network's various sites and transports.
This configuration uses `Originator: 0.0.0.0` as a wildcard to match TLOCs from any source, which is appropriate for establishing general underlay connectivity across different transports. It then explicitly accepts TLOCs of `MPLS` and `Public_Internet` colors, assigning a higher preference (555) to MPLS over Public_Internet (333), which is a common practice for traffic engineering and transport selection.
This option is identical to option B and correctly implements the underlay connectivity. Assuming distinct options are intended, B is the designated correct choice.
Matching a specific `Originator: 10.10.10.10` would limit tunnel formation to only that TLOC, which is not suitable for establishing broad underlay connectivity across multiple sites and transports.
Concept tested: Cisco SD-WAN TLOC policies and preferences
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policy-book/sdwan-policy-book_chapter_011.html
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