Editing Maximum transmission unit (section)

==In other contexts==
MTU is sometimes used to describe the maximum PDU sizes in communication layers other than the network layer.
* [[Cisco Systems]] and [[MikroTik]] use ''L2 MTU'' for the maximum frame size.<ref>{{Cite web|url=http://www.cisco.com/c/en/us/support/docs/switches/nexus-9000-series-switches/118994-config-nexus-00.html#anc6 |title=Configure and Verify Maximum Transmission Unit on Cisco Nexus Platforms |publisher=Cisco |id=Document ID:118994 |date=2016-11-29 |access-date=2017-01-04}}</ref><ref>{{Cite web|url=https://help.mikrotik.com/docs/display/ROS/MTU+in+RouterOS |title=MTU in RouterOS |publisher=MikroTik |date=2022-07-08 |access-date=2022-09-02}}</ref>
* [[Dell]]/[[Force10]] use ''MTU'' for the maximum frame size.<ref>{{Cite web|url=http://www.dell.com/Support/Article/en/us/debsdt1/HOW10713 |title=How to configure MTU (Maximum Transmission Unit) for Jumbo Frames on Dell Networking Force10 switches |publisher=Dell |date=2016-06-02 | access-date=2017-01-06 |id=Article ID: HOW10713}}</ref>
* [[Hewlett-Packard]] used just ''MTU'' for the maximum frame size including the optional [[IEEE 802.1Q]] tag.<ref>{{cite book|title=HP Networking 2910al Switches Management and Configuration Guide |chapter=Jumbo Frames |date=November 2011 |publisher=Hewlett-Packard |id=P/N 5998-2874}}</ref>
* [[Juniper Networks]] use several MTU terms: ''Physical Interface MTU'' (L3 MTU plus some unspecified protocol overhead), ''Logical Interface MTU'' (consistent with IETF MTU) and ''Maximum MTU'' (maximum configurable frame size for jumbo frames).<ref>{{cite web|url=http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/mtu-values-mini-pims-srx-series-services-gateway.html |title=SRX Series Services Gateways for the Branch Physical Interface Modules Reference: ''MTU Default and Maximum Values for Physical Interface Modules'' |publisher=Juniper |date=2014-01-03 |access-date=2017-01-04}}</ref>

The transmission of a [[packet (information technology)|packet]] on a physical network segment that is larger than the segment's MTU is known as [[Ethernet#Jabber|jabber]]. This is almost always caused by faulty devices.<ref>{{citation |url=http://www.thenetworkencyclopedia.com/entry/jabber/ |title=jabber |publisher=The Network Encyclopedia |access-date=2016-07-28}}</ref> [[Network switch]]es and some [[Ethernet hub|repeater hubs]] have a built-in capability to detect when a device is jabbering.<ref>{{citation |url=http://www.juniper.net/documentation/en_US/junos15.1/topics/reference/command-summary/show-interfaces-10-gigabit-ethernet.html |title=show interfaces |publisher=[[Juniper Networks]] |access-date=2016-07-28}}</ref><ref>IEEE 802.3 ''27.3.1.7 Receive jabber functional requirements''</ref>