Technical Documentation



ima-group-options {differential-delay number;frame-length (32 |64 |128 |256);frame-synchronization {alpha number;beta number;gamma number;}minimum-links number;symmetry (symmetrical-config-and-operation | symmetrical-config-asymmetrical-operation);test-procedure {ima-test-start;ima-test-stop;interface name;pattern number;period number;}transmit-clock (common |independent);version (1.0 |1.1);}

Hierarchy Level

[edit interfaces (t1-fpc/pic/port:m:n | e1-fpc/pic/port:n | t1|e1-fpc/pic/port)]

Release Information

Statement introduced in JUNOS Release 10.0.


Specify IMA group options.


differential-delay 1–56

Maximum differential delay among links in msec, the default is 25.

frame-length (32 |64 |128 |256)

IMA frame length in number of cells; default is 128.


IMA group frame synchronization selection.

alpha 1–2

Number of consecutive invalid ICP cells for IFSM, the default is 2.

beta 1–2

Number of consecutive errored ICP cells for IFSM, the default is 2.

gamma 1–5

Number of consecutive valid ICP cells for IFSM, the default is 1.

minimum-links 1-8

IMA group minimum active links; the default is 1.

symmetry (symmetrical-config-and-operation | symmetrical-config-asymmetrical-operation)

IMA group symmetry mode selection.


Specify an IMA link interface test.


Start IMA group test.


Stop IMA group test.

interface name

Interface name of the IMA link to test.

pattern 1–254

IMA test pattern, default is 170.

period 1-4294967294

Length of IMA pattern test in seconds, the default is 10.

transmit-clock (common |independent)

Transmit clock configuration; the default is common.

version (1.0 |1.1)

IMA specification version.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Published: 2010-04-20