Avaya VSP7254 default MTU 9216??

Hi,

I was looking more into the use of jumbo frames, and it's pretty obvious it should only be used with internal storage.

Now, I also read that in your LAN all your devices should support jumbo frames before you enable it anywhere. Because when enabled on your router, but disabled on your L2 switches you could have lots of issues with retransmissions etc. Is this information correct??

Second of all, why does an Avaya VSP7254 (for example), have MTU default set to 9216? Shouldn't it be set to ~1500 to avoid network performance decreasing?

Thanks for the information.