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Chapter 8

Centralized Data Policies

Page 304 • Traffic Engineering

Learning Objectives

SD-WAN Traffic Steering Diagram

Gambar 8.1 - Traffic steering berdasarkan aplikasi ke berbagai WAN transport

Data Policy vs Control Policy

Aspect Control Policy Data Policy
Operates On OMP routes (control plane) Actual traffic (data plane)
Applied At vSmart only vSmart → pushed to edges
Match Criteria Route attributes Packet headers, applications
Use Case Route filtering, topology Traffic steering, QoS marking

Traffic Steering

Data policies dapat mengarahkan traffic ke specific paths berdasarkan various criteria.

Steering Options:

  • TLOC-based: Steer ke specific transport (MPLS, Internet)
  • Color-based: Steer berdasarkan WAN link color
  • Service-based: Redirect ke service node
  • Local-based: Direct Internet Access (DIA)
Data Policy Example 
sequence 10
  match
    app-list critical-apps
  action accept
    set
      local-tloc color mpls
      # Steer critical apps to MPLS

sequence 20
  match
    app-list web-browsing
  action accept
    set
      local-tloc color biz-internet
      # Steer web to Internet

DSCP Marking

Data policies dapat set atau re-mark DSCP values untuk QoS treatment.

DSCP Value Per-Hop Behavior Typical Use
46 (EF) Expedited Forwarding Voice, real-time
34 (AF41) Assured Forwarding Video conferencing
26 (AF31) Assured Forwarding Mission critical
0 (BE) Best Effort Default traffic
End-to-End QoS

DSCP marking di SD-WAN overlay harus aligned dengan underlay QoS policies untuk effective treatment.

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