In computer networking, the term Maximum Transmission Unit (MTU) refers to the size (in bytes) of the largest packet that a given layer of a communications protocol can pass onwards. MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.). The MTU may be required by standards (as is the case with Ethernet) or decided at connect time (as is usually the case with point-point serial links). A higher MTU brings higher bandwidth efficiency. However large packets can block up a slow interface for some time, increasing the lag on other packets. For example a 1500 byte packet, the largest allowed on an Ethernet, will block up a 14.4k modem for about one second.
It is often misunderstood, but there is a difference between both values.
IP MTU Is the size of the IP Packet.
This can be configured with 'ip mtu xxxx' on the interface and its value checked with 'show ip interface x'. MPLS labels are also considered here.( Although you can specify a different value for those)
MTU is the also referred to as 'FRAME SIZE' and it is IP MTU + 14 (including DA, SA type or length). This is what you configure with the interface level command 'mtu xxx'
Last, you have preamble and CRC added to the Frames, but you should not concern with those as those are stripped on the controllers and driver respectably.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.