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.
Question
- public Internet
- business Internet
- MPLS
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)- A86% (24)
- B7% (2)
- C4% (1)
- D4% (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.
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.
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.
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.
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
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