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longnguyen
New Member
March 30, 2025
Question

SD-WAN design

Can someone explain to me the difference and application scenarios between SD-WAN DUAL HUB Primary/Secondary and SD-WAN DUAL HUB Primary/Primary?

Note that I have 2 private data centers and different network spaces?

5 replies

Toshi_Esumi
SuperUser
SuperUser
March 30, 2025

These two KBs explain the difference. If the resources are split to two HUBs, it's primary/primar. The secondary hub is just duplicate/backup of the primary.
https://community.fortinet.com/t5/4D-Documents/Multi-Datacenter-Primary-Secondary-Enterprise-SD-WAN/ta-p/265844
https://community.fortinet.com/t5/4D-Documents/Multi-Datacenter-Primary-Primary-Enterprise-SD-WAN/ta-p/265846

Toshi

longnguyen
New Member
March 30, 2025

if I have a file server located at HUB1 with IP 10.10.1.100 and a file server located at HUB2 with IP 10.200.1.100, the 2 file servers are synchronized with each other. So can the branches connect to File Server 10.200.1.100 with Pri/Sec model? Assuming Primary Gateway is still working normally.

Toshi_Esumi
SuperUser
SuperUser
March 30, 2025

First, the secondary is inactive while the primary is active.
Second, if IPs are different those FGTs would see them as different hosts in different subnets in the network.

So it wouldn't work with the P/S setup.

Toshi

longnguyen
New Member
March 30, 2025

if I have a file server located at HUB1 with IP 10.10.1.100 and a file server located at HUB2 with IP 10.200.1.100, the 2 file servers are synchronized with each other. So can the branches connect to File Server 10.200.1.100 with Pri/Sec model? Assuming Primary Gateway is still working normally.

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