Multi-site MPLS with internet backup template

Components in this network diagram

• Carrier MPLS VPN cloud
• PE router: head office
• PE router: data centre
• PE router: branch 1
• PE router: branch 2
• Internet
• Head office firewall
• Data centre firewall
• Branch 1 firewall
• Branch 2 firewall
• CE router: head office, Cisco ISR
• CE router: data centre
• CE router: branch 1
• CE router: branch 2
• MPLS path up? BGP & IP SLA
• Primary: MPLS with QoS for voice
• Failover: IPsec tunnel over internet
• ERP, file & voice servers
• Head office LAN
• Branch 2 LAN

How to use this network diagram template

1. Click Open in the editor. The network diagram opens on a new page in FlowDiagram — nothing is uploaded and there is no sign-up.
2. Rename, add or delete shapes and drag them where you want; connectors stay attached as things move.
3. Drop in vendor logos from the library — 1,160 of them, including every AWS, Azure and Google Cloud service icon — or restyle it with the colour and theme controls.
4. Prefer text? Edit the Mermaid source below and paste it in through ☰ → Import diagram (see the Mermaid editor); it imports as an editable diagram.
5. Export to PNG, SVG or PDF, or press Ctrl+L for a link that carries the whole diagram.

Mermaid source

The whole template is the text below. Paste it into FlowDiagram, keep it in Git next to the code it describes, or hand it to an AI assistant to extend.

flowchart TD
  MPLS((Carrier MPLS VPN cloud)) --> PEHQ[PE router: head office]
  MPLS --> PEDC[PE router: data centre]
  MPLS --> PEB1[PE router: branch 1]
  MPLS --> PEB2[PE router: branch 2]
  INET((Internet)) --> FWHQ[Head office firewall]
  INET --> FWDC[Data centre firewall]
  INET --> FWB1[Branch 1 firewall]
  INET --> FWB2[Branch 2 firewall]
  PEHQ --> CEHQ[CE router: head office, Cisco ISR]
  PEDC --> CEDC[CE router: data centre]
  PEB1 --> CEB1[CE router: branch 1]
  PEB2 --> CEB2[CE router: branch 2]
  CEB1 --> CHECK{MPLS path up? BGP & IP SLA}
  CHECK -->|Yes| PRIMARY[Primary: MPLS with QoS for voice]
  CHECK -->|No| BACKUP[Failover: IPsec tunnel over internet]
  BACKUP --> FWB1
  FWB1 -.->|IPsec| FWDC
  FWB2 -.->|IPsec| FWDC
  CEDC --> APPS[(ERP, file & voice servers)]
  FWDC --> APPS
  CEHQ --> HQLAN[Head office LAN]
  CEB2 --> B2LAN[Branch 2 LAN]
  PRIMARY --> PEB1

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