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Media MTU Sizes by Interface Type for MX Series Routers on page 60
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Media MTU Sizes by Interface Type for T320 Routers on page 61
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Media MTU Sizes by Interface Type for T640 Platforms on page 61
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Media MTU Sizes by Interface Type for J2300 Platforms on page 62
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Media MTU Sizes by Interface Type for J4300 and J6300 Platforms on page 62
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Media MTU Sizes by Interface Type for J4350 and J6350 Platforms on page 63
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Media MTU Sizes by Interface Type for EX Series Switches and ACX Series
Routers on page 65
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Media MTU Sizes by Interface Type for PTX Series Packet Transport Routers on page 65
Media MTU Overview
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 56.
Copyright © 2015, Juniper Networks, Inc.54
Network Interfaces for EX4300 Switches