How to Configure the Media MTU
To modify the default media MTU size for a physical interface, include the mtu statement
at the [edit interfaces interface-name] hierarchy level:
[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 mtu statement at the following hierarchy
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 inet and inet6 families
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 inet and inet6 families that are configured on the same logical interface.
Encapsulation Overhead by Encapsulation Type
Table 16: Encapsulation Overhead by Encapsulation Type
Encapsulation Overhead (Bytes)Interface Encapsulation
21802.1Q/Ethernet 802.3
26802.1Q/Ethernet Subnetwork Access Protocol (SNAP)
18802.1Q/Ethernet version 2
4ATM Cell Relay
12ATM permanent virtual connection (PVC)
4Cisco HDLC
17Ethernet 802.3
Copyright © 2017, Juniper Networks, Inc.98
ACX Series Universal Access Router Configuration Guide
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