Traffic takes different routes depending on application

[FlowBank-IT]

Hi community,

I am facing a weird behavior that is driving me nuts.

I have 2 sites linked by a Leased Line (zone L3-GW-InterDC) and an IPSec tunnel (zone L3-VPN) as a backup. 2 static routes are therefore configured, with different weight and path monitoring. I don't use PBF in this setup

Everything works fine, except for this traffic between 2 hosts where some applications go via the Leased Line, but the sip traffic still try to go via the IP Sec Tunnel and I can't understand why :

Do you have any idea of what could cause this behavior ?

Tx in advance for your help,

[BPry]

@FlowBank-IT,

If you aren't using PBF then application shouldn't be coming into play at all, but it could simply be taking an established session continually so it isn't having to go through route lookup again. When you can without causing issues, I would simply try clearing all sessions by going into the CLI and issuing clear session all filter destination <ip> and then testing again.