What happens to active sessions in Dual ISP Scenario

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L4 Transporter

What happens to active sessions in Dual ISP Scenario

We have 2 ISP's, primary is down right now. Both ISP's connect to different interfaces. When Primary comes up, the interface will be different for outgoing/incoming traffic. Will the active rdp/web sessions/GlobalProtect/IPSEC tunnels drop when primary link becomes active again. Or will it be seamless.


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L2 Linker

Hi @raji_toor ,

 

Great question . As per my understanding established sessions will not follow the route lookup so in this case it will continue to use ISP 2 once the ISP 1 became active. New sessions initiated will route through ISP 1. Hope it helps.

 

Thanks,

Ram

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Highlighted
L2 Linker

Hi @raji_toor ,

 

Great question . As per my understanding established sessions will not follow the route lookup so in this case it will continue to use ISP 2 once the ISP 1 became active. New sessions initiated will route through ISP 1. Hope it helps.

 

Thanks,

Ram

View solution in original post

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L4 Transporter

Yes, existing sessions take some time to route through ISP1. We were in this situation yesterday and can confirm it.

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