08-25-2008 03:37 AM - edited 03-06-2019 12:58 AM
08-25-2008 06:56 AM
Hi,
you can use the command lookup tool to solve your problem ;)
ip mtu (source: command lookup tool)
To set the maximum transmission unit (MTU) size of IP packets sent on an interface, use the ip mtu command in interface configuration mode. To restore the default MTU size, use the no form of this command.
ip mtu bytes
no ip mtu
Syntax Description
bytes
MTU in bytes.
Defaults
Minimum is 128 bytes; maximum depends on the interface medium.
Command Modes
Interface configuration (config-if)
Command History
Release Modification
10.0
This command was introduced.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX
This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
Usage Guidelines
If an IP packet exceeds the MTU set for the interface, the Cisco IOS software will fragment it.
All devices on a physical medium must have the same protocol MTU in order to operate.
Greetz from Germany ;)
08-25-2008 08:59 AM
Yes, they are different. IP MTU only applies to IP packets.
"Note Changing the MTU value (with the mtu interface configuration command) can affect the IP MTU value. If the current IP MTU value is the same as the MTU value, and you change the MTU value, the IP MTU value will be modified automatically to match the new MTU. However, the reverse is not true; changing the IP MTU value has no effect on the value for the mtu command."
08-25-2008 04:06 AM
HI
The hardware MTU configured with the mtu interface configuration command
The IP MTU configured with the ip mtu interface configuration command
The MPLS MTU configured with the mpls mtu interface configuration command
Hope this help
08-25-2008 04:59 AM
Hi,
Thanks for yr reply.
I am not refering to the command but is asking what is the difference between IP MTU and interface MTU ?
Is the IP MTU size always the same as the interface MTU size ?
Regards
08-25-2008 06:56 AM
Hi,
you can use the command lookup tool to solve your problem ;)
ip mtu (source: command lookup tool)
To set the maximum transmission unit (MTU) size of IP packets sent on an interface, use the ip mtu command in interface configuration mode. To restore the default MTU size, use the no form of this command.
ip mtu bytes
no ip mtu
Syntax Description
bytes
MTU in bytes.
Defaults
Minimum is 128 bytes; maximum depends on the interface medium.
Command Modes
Interface configuration (config-if)
Command History
Release Modification
10.0
This command was introduced.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX
This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.
Usage Guidelines
If an IP packet exceeds the MTU set for the interface, the Cisco IOS software will fragment it.
All devices on a physical medium must have the same protocol MTU in order to operate.
Greetz from Germany ;)
08-25-2008 08:59 AM
Yes, they are different. IP MTU only applies to IP packets.
"Note Changing the MTU value (with the mtu interface configuration command) can affect the IP MTU value. If the current IP MTU value is the same as the MTU value, and you change the MTU value, the IP MTU value will be modified automatically to match the new MTU. However, the reverse is not true; changing the IP MTU value has no effect on the value for the mtu command."
08-25-2008 10:42 AM
Hi All,
Thanks for your explanation.
Now it is much clearer.
Thanks again
birdy
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