Palo Alto with Cisco router, GRE goes down

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Palo Alto with Cisco router, GRE goes down

L0 Member

Palo Alto with Cisco router, GRE goes down after enabling the keep alive in Palo Alto side,

note that the GRE tunnel goes down from the Palo Alto side but still up from the Cisco side, but there is no ping reachability from both side

Does anyone have an idea



Cyber Elite
Cyber Elite

Hello @Sudqi_I


could you confirm whether you enabled on Cisco side the keepalive under tunnel interface with command "keepalive"? Technically, GRE interface does not have any built-in mechanism to take tunnel down if the other side of the tunnel is unreachable. GRE is up as long as underlaying interface to build tunnel is up and it has a route to tunnel destination.


Kind Regards


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Hi Pavel,

yes, you are right, we set up keepalive under a tunnel in the Cisco router,

but when it is enabled under Palo Alto it goes down after 30 seconds if we put the setup (10, 3) note that it still up in Cisco

and for the routes, it is directly connected, I don't think we should configure any static router, because we have reachability but lose it after a while


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