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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

mtu — interface

Synopsis

mtu bytes
no mtu bytes

Configures

Maximum transmission unit (MTU)

Default

Depends on media type (defaults for some common media are listed in Table 17-11, under the ip mtu command)

Description

This command allows you to modify the MTU for any interface. The default MTU depends on the media you are using (FDDI, Ethernet, etc.); for example, Ethernet has an MTU of 1,500.

Performance considerations may lead you to modify this value; a smaller MTU might give better performance on a lossy or noisy line.

Example

interface ethernet0
  mtu 1250

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