Some application cannot work with VRRP

[Supakorn Visutthicho]

I got the problem when deploying 2 vEdge at HQ Site with VRRP and 1 cEdge (ISR) at Branch site, Everything can work via SD-WAN tunnel except some application etc. SAP cannot work. I tried to down 1 vEdge (VRRP Standby) at HQ Site. The result shows that everything (all application) can be used normally include SAP.

I'm not sure if there is a problem with VRRP or not?. Has anyone ever encountered problems about this. 

[ekhabaro]

Can you please tell us more about your HQ site. Do you have HW based vEdges or vEdge-cloud in HQ? which version do you use? It would be great if you can provide us with configurations.

[Supakorn Visutthicho]

Thanks for reply. I found the root cause. TCP Optimization is cause of this problem. Now i disabled TCP Optimization feature.

[ekhabaro]

Yes, it's common and well known problem. tcp-optimization requires flows to be symmetric.