300-415 Question #200: Real Exam Question with Answer & Explanation

The correct answer is A: omp no shutdown ecmp-limit 2. To route traffic across two available links using Equal-Cost Multi-Path (ECMP), the 'ecmp-limit 2' command under OMP configuration is used to advertise up to two equal-cost paths.

WAN Edge Router Deployment

Question

An enterprise has these three WAN connections:
public Internet
business Internet
MPLS

An engineer must configure two available links to route traffic via both links. Which configuration achieves this objective?

Options

Aomp no shutdown ecmp-limit 2
Bomp no shutdown send-path-limit 2
Comp no shutdown overlay-as 2
Domp no shutdown route-limit 2

Explanation

To route traffic across two available links using Equal-Cost Multi-Path (ECMP), the 'ecmp-limit 2' command under OMP configuration is used to advertise up to two equal-cost paths.

Common mistakes.

B. The 'send-path-limit' command controls the maximum number of paths that a WAN Edge router advertises to the vSmart controller for a given OMP route, not the number of paths used for forwarding by receiving routers.
C. The 'overlay-as' command is used to define the autonomous system number for the OMP overlay network, which is unrelated to configuring ECMP for routing traffic across multiple links.
D. The 'route-limit' command specifies the maximum number of OMP routes that can be sent or received by a router, which does not directly enable ECMP forwarding over multiple paths.

Concept tested. Cisco SD-WAN OMP ECMP Configuration

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/sdwan-routing-book/sdwan-routing-book_chapter_01.html#_Configure_ECMP_Paths

Topics

#SD-WAN#OMP#ECMP#WAN Edge routing

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