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300-415 · Question #203

Which OMP route is selected for equal OMP route preference values on WAN Edge routers?

The correct answer is D. route with higher TLOC preference value. When multiple OMP routes have equal preference values, the WAN Edge router selects the route with the higher TLOC preference value as a tie-breaker.

WAN Edge Router Deployment

Question

Which OMP route is selected for equal OMP route preference values on WAN Edge routers?

Options

  • Aroute with origin type of connected
  • Broute with origin type of static
  • Croute with lower TLOC preference value
  • Droute with higher TLOC preference value

How the community answered

(41 responses)
  • A
    2% (1)
  • B
    2% (1)
  • D
    95% (39)

Why each option

When multiple OMP routes have equal preference values, the WAN Edge router selects the route with the higher TLOC preference value as a tie-breaker.

Aroute with origin type of connected

While "connected" is a preferred origin type (lower value), this criterion is applied before the TLOC preference if OMP route preferences for other attributes are equal.

Broute with origin type of static

"Static" is an origin type, which is also considered before TLOC preference as a tie-breaker, assuming other OMP route preferences are equal.

Croute with lower TLOC preference value

The OMP route selection algorithm explicitly prefers a higher TLOC preference value, not a lower one, when other route attributes are equal.

Droute with higher TLOC preference valueCorrect

When a WAN Edge router receives multiple OMP routes for the same prefix with identical OMP route preference values (such as administrative distance, origin type preference, or OMP-specific route preference), the next tie-breaker in the OMP route selection algorithm is to prefer the route that points to a TLOC with a higher TLOC preference value. The TLOC preference is an attribute of the TLOC itself, indicating its desirability.

Concept tested: Cisco SD-WAN OMP Route Selection Algorithm

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-routing-book/sdwan-routing-book_chapter_01.html#_OMP_Best_Path_Selection_Algorithm

Topics

#OMP#Route selection#TLOC preference#WAN Edge

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