Juniper JUNOSE 11.1.X - COMMAND REFERENCE N TO Z 4-6-2010 Command Reference Manual page 1405

tunnel mtu
tunnel mtu mtuSize
Syntax
no tunnel mtu
Command introduced before JUNOSe Release 7.1.0
Release Information
IPSec Tunnel Profile Configuration mode added in JUNOSe Release 7.3.0.
IP Tunnel Destination Profile Configuration mode added in JUNOSe Release 8.2.0.
Configures the maximum transmission unit size for the particular tunnel. The no
Description
version restores the default value, 1024 for static DVMRP and GRE tunnels, 10240
for dynamic DVMRP and GRE tunnels, 1440 for static IPSec tunnels, and 1400 for
dynamic IPSec tunnels.
Options
Interface Configuration, IP Tunnel Destination Profile Configuration, IPSec Tunnel
Mode
Profile Configuration
mtuSize Packet size in bytes allowed for transmission through the tunnel in the
range; in the range 1024–10240 for DVMRP and GRE tunnels, in the range
160–9000 for IPSec tunnels.
Chapter 8: T Commands
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tunnel mtu