When you increase the MTU make sure you do to the devices interconnected, in your case I presume switches.
If one device has a smaller MTU than the other, it will cause fragmentation.
For reminder, MTU: Is the maximum packet size, in bytes, that can be transmitted across a link. The MTU determines the size of your packets, so if it is too small, your computer will be responding often. If it is too big, errors will cause each packet to be resent or there will be fragmentation.
for example i configured a port on a 6500 to haave an mtu of 9000. All the switches that will be cascaded via this port should also be configured with that mtu, and all of the computer/servers connected via this switches should also have an mtu of 9000? am i correct?
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