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Thats a tough one to figure out. Phoneboy and Tim made good points, though I would find it a bit odd that upgrade would have caused any issues with MTU. I dont think it matters at all as far as OS version, I see people still have vpn tunnels between R77.30 gateways and R81 and works with no issues. Personally, I would contact TAC, just to verify that something with the config had not changed on the upgraded cluster.
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