How To Configure The Media Mtu; Encapsulation Overhead By Encapsulation Type - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

How to Configure the Media MTU

Encapsulation Overhead by Encapsulation Type

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To modify the default media MTU size for a physical interface, include the
at the
[edit interfaces interface-name]
[edit interfaces interface-name]
mtu bytes;
If you change the size of the media MTU, you must ensure that the size is equal to or
greater than the sum of the protocol MTU and the encapsulation overhead.
NOTE: Changing the media MTU or protocol MTU causes an interface to be
deleted and added again.
You configure the protocol MTU by including the
levels:
[edit interfaces interface-name unit logical-unit-number family inet]
[edit interfaces interface-name unit logical-unit-number family inet6]
If you configure the protocol MTU at any of these hierarchy levels, the configured value
is applied to all families that are configured on the logical interface.
NOTE: If you are configuring the protocol MTU for both
on the same logical interface, you must configure the same value for both
the families. It is not recommended to configure different MTU size values
for and
inet inet6
Table 16: Encapsulation Overhead by Encapsulation Type
Interface Encapsulation
802.1Q/Ethernet 802.3
802.1Q/Ethernet Subnetwork Access Protocol (SNAP)
802.1Q/Ethernet version 2
ATM Cell Relay
ATM permanent virtual connection (PVC)
Cisco HDLC
Ethernet 802.3
hierarchy level:
statement at the following hierarchy
mtu
families that are configured on the same logical interface.
mtu statement
and families
inet inet6
Encapsulation Overhead (Bytes)
21
26
18
4
12
4
17
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