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.
Question
Exhibit
Options
- A2
- B3
- C5
- D10
How the community answered
(52 responses)- A6% (3)
- B4% (2)
- C75% (39)
- D15% (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.
A value of 2 would only allow vSmart to advertise 2 paths per prefix, dropping 3 valid transport paths per WAN Edge device.
A value of 3 covers only the ISP transports and would omit the 2 MPLS transport paths from OMP advertisements.
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.
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
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