Table 9: Media Mtu Sizes By Interface Type For M5, M7I With Cfeb, M10, M10I With Cfeb, M20, And M40 Routers; Table 10: Media Mtu Sizes By Interface Type For M40E Routers - Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual

JUNOS 10.1 Network Interfaces Configuration Guide
Configuring the Media MTU
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). Table 9 on page 110 through Table 15 on page 113 list the media
and protocol MTU sizes by interface type, and Table 18 on page 116 lists the
encapsulation overhead by encapsulation type.
Table 9: Media MTU Sizes by Interface Type for M5, M7i with CFEB, M10, M10i with
CFEB, M20, and M40 Routers

Table 10: Media MTU Sizes by Interface Type for M40e Routers

110
Configuring the Media MTU
[edit interfaces interface-name]
link-mode (full-duplex | half-duplex);
Default Media
Interface Type MTU (Bytes)
Adaptive Services 9192
(MTU size not
configurable)
ATM 4482
E1/T1 1504
E3/T3 4474
Fast Ethernet 1514
Gigabit Ethernet 1514
Serial 1504
SONET/SDH 4474
Default Media
Interface Type MTU (Bytes)
Adaptive Services 9192
(MTU size not
configurable)
ATM 4482
E1/T1 1504
Maximum MTU Default IP Protocol
(Bytes) MTU (Bytes)
N/A N/A
9192 4470
9192 1500
9192 4470
9192 (4-port) 1500 (IPv4)1497 (ISO)
1532 (8-port)
1532 (12-port)
9192 1500 (IPv4)1497 (ISO)
9192 1500 (IPv4)1497 (ISO)
9192 4470
Default IP Protocol
Maximum MTU (Bytes) MTU (Bytes)
N/A N/A
9192 4470
4500 1500