When both ECMP and SDWAN traffic distribution profiles are active on the same interfaces, which one is prioritized?

When both ECMP and SDWAN traffic distribution profiles are active on the same interfaces, which one is prioritized?

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Created On 10/22/23 22:49 PM - Last Modified 03/11/25 23:20 PM


Question


  • When both ECMP and SDWAN traffic distribution profiles are active on the same interfaces, which one is prioritized?

Environment


  • Strata Firewalls
  • PANOS 
  • SDWAN
  • ECMP

Answer


  1. SDWAN traffic distribution profile is prioritized over ECMP.
  2. If ECMP is enabled, it will be disregarded.
  3. Consider the following configuration as an example:
    • If two interfaces with ECMP enabled are configured with different SDWAN-tags.
    • The SDWAN traffic distribution profile operates using a top-down mechanism.
    • When SDWAN makes a routing decision, it matches the traffic to the vif (logical SDWAN interface), and within the vif, there are entries for both interfaces.
    • Consequently, all link selections will be determined based on the SDWAN traffic distribution profile.
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