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why VDX responds to icmp requests with payload >1500 bytes, despite L3 MTU being 1500 bytes

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Titlewhy VDX responds to icmp requests with payload >1500 bytes, despite L3 MTU being 1500 bytes
Question
Why VDX responds to icmp requests with payload >1500 bytes, despite L3 MTU being 1500 bytes?

L2 mtu between two boxes is 9216 (VDX) and 9192 (MX204). L3 MTU is 1500 on VDX  and 9174 (MX240). 
Environment
VDX
NOS ALL
Answer
The DF bit will tell only the transit nodes to not fragment, but when the packet reaches the destination (in our case VDX device) the DF bit is ignored and the VDX responds to the ping. 

IF the destination is a host that is connected to the VDX, VDX will drop the packet on the egress if the MTU size configured on the interface is less than the packet MTU.
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