IPSEC TUNNEL SHOW ACTIVE BUT TRAFFICE NOT FLOWING

[HARIS_HUSSAIN]

I have a test setup with CSR1 and CSR2 connected via the dummy Internet. as below

When i Configure Tunnel mode to be GRE ip everything work I am able to ping between routers and also the tunnel interface.

But if i set tunnel mode ipsec ipv4 it stops working. Can any one help here.

Attached configuration ofr CSR1 and CSR2

[Rob Ingram]

Hi,
I have previously tested OSPF with VTI (tunnel mode ipsec ipv4) and it does work. Can you confirm what doesn't work, do you mean the IKEv2 and IPSec SA are not formed or the OSPF adjacency isn't established?

I noticed you have different MTU on your tunnel interfaces, make them the same value - this could stop OSPF adjacency forming.

HTH