MTU is set per port via CLI, Web GUI or cnMaestro.
CLI
config terminal
interface range gi 0/1-24
mtu 9216
end
show interfaces mtu
Web GUI
cnMaestro
MTU setting is in the Switch Port page.
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Assign the switch to a Switch Group
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Select Switch Ports from the Switch Group dash board as shown:
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To change MTU for all ports, check the Port radio box and click Edit. For changing individual port, click the port directly.
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Enter the new MTU
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Navigate to the Switch Configuration
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Sync the configuration to the switch