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300-415 · Question #90

Refer to the exhibit. A network administrator is configuring OMP in vManage to advertise all the paths for the same prefix from a site that has two WAN Edge devices Each WAN Edge device is connected…

The correct answer is C. 5. With two WAN Edge devices each connected to 5 transports, the minimum OMP paths-per-prefix value that allows all local transport paths to be advertised is 5, covering all transports on a single WAN Edge.

WAN Edge Router Deployment

Question

Refer to the exhibit. A network administrator is configuring OMP in vManage to advertise all the paths for the same prefix from a site that has two WAN Edge devices Each WAN Edge device is connected to three ISPs and two private MPLS transports. What is the minimum value for "Number of Paths advertised per Prefix" that should be configured?

Exhibit

300-415 question #90 exhibit

Options

  • A2
  • B3
  • C5
  • D10

How the community answered

(52 responses)
  • A
    6% (3)
  • B
    4% (2)
  • C
    75% (39)
  • D
    15% (8)

Why each option

With two WAN Edge devices each connected to 5 transports, the minimum OMP paths-per-prefix value that allows all local transport paths to be advertised is 5, covering all transports on a single WAN Edge.

A2

A value of 2 would only allow vSmart to advertise 2 paths per prefix, dropping 3 valid transport paths per WAN Edge device.

B3

A value of 3 covers only the ISP transports and would omit the 2 MPLS transport paths from OMP advertisements.

C5Correct

Each WAN Edge device has 5 transport connections (3 ISPs plus 2 MPLS), meaning each device can generate up to 5 OMP routes for the same prefix - one per TLOC. The 'Number of Paths Advertised per Prefix' setting on vSmart must be at least 5 to ensure all paths from a single WAN Edge are included in OMP advertisements to remote sites. A value of 5 is the minimum required to avoid dropping valid TLOC paths.

D10

A value of 10 would accommodate both WAN Edge devices fully (5 paths each), but 5 is the minimum needed to at least advertise all paths from one device without dropping any.

Concept tested: OMP number of paths advertised per prefix configuration

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-omp.html

Topics

#OMP#WAN Edge#Path Advertisement#TLOC

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