N9K cannot ping mtu 1500 df-bit

[admin@atrinnet.net]

Hi i have this Diagaram set ip on VLAN 2 Router and N9K 

Router can ping N9K by mtu 1500 donnot fragment 

But N9K ping router by size 1450 and lower 

No tunnel Only have physical interface and VLANS (3850 is layer 2 switch )

How solve this ?

[Flavio Miranda]

admin@atrinnet.net 

What is the MTU configured on the Nexus. 

It seems the MTU is set to some value lower than 1500

[admin@atrinnet.net]

Mtu set jumbo 9216

[ammahend]

MTU on N9K outgoing interface or 3850 incoming interface is set to 1450, when you send traffic with MTU bigger than that with DF bit set, it has no option than to drop it, as recommend share show interface <interface number> information from both switches.

[admin@atrinnet.net]

How Active clamp tcp mss on gre tunnel by nexus ????