IP MTU Command on CISCO Router/Switch

Command

IP MTU

Use

This command changes the MTU of a link if required. It is mostly used for DSL or similar setups.

Syntax

Router(config-if)#ip mtu <68-1500>

Example

In this example, we will lower the MTU on R1’s Fa0/0 to 1492.

R1(config-if)#int fa0/0
R1(config-if)#ip mtu 1492

R1(config-if)#do sh int fa0/0 | in MTU
MTU 1492 bytes, BW 100000 Kbit, DLY 100 usec,

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