Media Mtu Overview - Juniper EX2200 Hardware Manual

Network Interfaces for EX4300 Switches

Media MTU Overview

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Media MTU Sizes by Interface Type for MX Series Routers on page 60
Media MTU Sizes by Interface Type for T320 Routers on page 61
Media MTU Sizes by Interface Type for T640 Platforms on page 61
Media MTU Sizes by Interface Type for J2300 Platforms on page 62
Media MTU Sizes by Interface Type for J4300 and J6300 Platforms on page 62
Media MTU Sizes by Interface Type for J4350 and J6350 Platforms on page 63
Media MTU Sizes by Interface Type for EX Series Switches and ACX Series
Routers on page 65
Media MTU Sizes by Interface Type for PTX Series Packet Transport Routers on page 65
The default media MTU size used on a physical interface depends on the encapsulation
used on that interface. In some cases, the default IP Protocol MTU depends on whether
the protocol used is IP version 4 (IPv4) or International Organization for Standardization
(ISO).
The default media MTU is calculated as follows:
Default media MTU = Default IP MTU + encapsulation overhead
When you are configuring point-to-point connections, the MTU sizes on both sides of the
connections must be the same. Also, when you are configuring point-to-multipoint
connections, all interfaces in the subnet must use the same MTU size. For details about
encapsulation overhead, see "Encapsulation Overhead by Encapsulation Type" on page
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