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300-415 · Question #200

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…

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?

Exhibit

300-415 question #200 exhibit

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

How the community answered

(28 responses)
  • A
    86% (24)
  • B
    7% (2)
  • C
    4% (1)
  • D
    4% (1)

Why each option

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.

Aomp no shutdown ecmp-limit 2Correct

The 'ecmp-limit 2' command, configured under the OMP routing protocol, specifies that OMP should advertise up to two equal-cost paths for a given route. This allows the receiving WAN Edge routers to perform Equal-Cost Multi-Path (ECMP) load-sharing across the specified number of links, thereby routing traffic simultaneously via both desired WAN connections.

Bomp no shutdown send-path-limit 2

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.

Comp no shutdown overlay-as 2

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.

Domp no shutdown route-limit 2

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

Source: 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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