Microsoft AZ-700: Improve Data Path Performance Between Networks with ExpressRoute FastPath

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Notes from MS Learn AZ-700 Module 3: Design and Implement Azure ExpressRoute – Unit 9: Improve Data Path Performance Between Networks with ExpressRoute FastPath

FastPath is intended to improve path performance between on-prem and virtual network. Enabling has FastPath send traffic straight to VMs bypassing the gateway

  • Circuits
    • FastPath is available on all ExpressRoute Circuits
  • Gateways
    • FastPath still needs Virtual Network Gateway to exchange route between virtual and on-prem networks
  • Gateway requirements for ExpressRoute FastPath
    • Configuration – Virtual Network Gateway must be
      • Ultra-Performance
      • ErGw3AZ
        • If planned use for IPv6 private peering must be this SKU only available for ExpressRoute Direct circuits
    • Limitations
      • Does not support
        • UDR on gateway subnet: UDR has 0 impact on traffic FastPath sends from on-prem to VMs in a VNet
        • Private link: If connecting private endpoint in VNet to on-prem it goes through virtual network gateway
  • Configure ExpressRoute FastPath
    • Requirements/Worekflow
      • Active ExpressRoute Circuit required
      • Follow instruction for ExpressRoute circuit and have provider enable
      • Make sure Azure private peering configured for circuit
      • Make sure Azure private peering configured and successful BGP between network and MS
      • Make sure VNet and Virtual Network Gateway fully provisioned using GatewayType ‘ExpressRoute’
      • Possible to link up to 10 VNets on standard SKU. All VNets in same geopolitical region when using standard
      • Single VNet links up to 16 ExpressRoute Circuits
      • If ExpressRoute premium, can link VNets outside of geopolitical region of circuit.
        • Allows for more than 10 VNets based on chosen bandwidtch
      • To create from ExpressRoute Circuit to target ExpressRoute Virtual Network Gateway
        • Address spaces advertised from local/peered VNet must be = or < 200
        • Once success can add up to 1000 address spaces
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Matt Ouellette

Matt Ouellette is a certified information technology professional residing in Southwest Michigan. His technology findings and advice can be found on his PacketPilot blog. Mr. Ouellette spent 4 years as an I.T. Technician before stepping into a Network Engineer role at Bronson Health Group. Since completing his Associates Degree in Network Administration Matt has taken a head on approach to career enrichment through obtaining credentials such as CCNP, CCNA Voice, MCSA: Server 2008, and VCP5. This passion for continued learning allows him to deliver up to date quality technical solutions.

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