SD-WAN

Terms

DIA — Direct Internet Access

• Commodity Internet

MPLS — Multi-protocol Label Switching

• A private network provided by an ISP.
• Expensive and fast.

BFD — Bidirectional Forwarding Detection

Cisco SD-WAN Cloud OnRamp

• Figures out the best path and measures jitter

[Portal Page]

IAAS

flowchart LR
    SDWAN(Cisco SD-WAN)
    OnRamp((Cloud OnRamp<br>for MultiCloud))

    SDWAN --> OnRamp
    OnRamp --> Azure(Azure)
    OnRamp --> AWS(AWS)
    OnRamp --> GCP(Google Cloud)

    subgraph IaaS
        Azure
        AWS
        GCP
    end

SaaS

flowchart LR
    SDWAN(Cisco SD-WAN) --> OnRamp((Cloud OnRamp<br>for SaaS))
    OnRamp --> O365(Office 365)
    OnRamp --> SP(SharePoint)

    subgraph SaaS
        O365
        SP
    end

SD-WAN Policy

Policies are further classified as

• Local Policy: Programed on the edges. ACLs, QoS, routing, and AAA.
• Centralized Policy: Route policy, before being sent to the edges, (Topology, VPN Membership, Application Aware Routing)

Application Aware Routing

AAR — Application Aware Routing

FEC — Forward Error Correction

• Every four packets, send a parity packet

Packet Duplication

• Send twice as much data via two tunnels
• The receiving vEdge router can reconstruct it

TCP Optimization and Session Persistence

• High-latency links: satellite
• Open one TCP session
  • Proxy
  • Reuse
  • Never drop

DRE — Data Redundancy Elimination

• Modern compression
• WAN links

vQoE — Viptela Quality of Experience

• AAR, or CoR
• Edge sends HTTP probes to measure jitter and/or loss
• 0 to 10, 10 being best.

VPNs

Multicast

• PIM-SM is supported
• the RP is one of the control nodes.

Commands

!
! Control Setup
!
show sdwan control local-properties
show sdwan control connections
show sdwan control connection-history
!
! OMP
!
show sdwan omp peers
show sdwan omp routes
show sdwan omp tlocs
show sdwan omp services
show sdwan omp summary
show sdwan omp multicast-routes
!
! Validator
!
show orchestrator connections

References

Cisco Live - SD-WAN Start Here - Lars Granberg - BRKENT-2108

Network Academy - SD-WAN Deep-Dive

Cisco Community - Cisco SD-WAN Webinar

Design Zone for Branch/WAN - Cisco Catalyst SD-WAN Design Guide - Cisco