Table 19: Media MTU Sizes by Interface Type for M7i Routers with CFEB-E,
M10i Routers with CFEB-E, and M320 and M120 Routers (continued)
Default IP Protocol
MTU (Bytes)
Maximum MTU
(Bytes)
Default Media
MTU (Bytes)Interface Type
447091924474Channelized STM1 IQ
447045004471DS3
150045001504E1
447045004471E3 IQ
1500 (IPv4),
1497 (ISO)
1533 (4-port)
1532 (8-, 12- and
48-port)
1514Fast Ethernet
1500 (IPv4),
1497 (ISO)
91921514Gigabit Ethernet
447091924474SONET/SDH
150045001504T1
447091924474CT3 IQ
(excluding M120)
Media MTU Sizes by Interface Type for MX Series Routers
Table 20: Media MTU Sizes by Interface Type for MX Series Routers
Default IP Protocol
MTU (Bytes)Maximum MTU (Bytes)
Default Media
MTU (Bytes)Interface Type
1500 (IPv4),
1488 (MPLS),
1497 (ISO)
91921514Gigabit Ethernet
1500 (IPv4),
1488 (MPLS),
1497 (ISO)
9192151410-Gigabit Ethernet
1500 (IPv4),
1488 (MPLS),
1497 (ISO)
91921514Multi-Rate Ethernet
1500 (IPv4),
1488 (MPLS),
1497 (ISO)
91921514Tri-Rate Ethernet
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Network Interfaces for EX4300 Switches