Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?





Hierarchy Level

Release Information

Statement introduced in Junos OS Release 10.0.

Statement introduced in Junos OS Release 12.2 for the ACX Series Universal Metro Routers.


Specify IMA group options.


differential-delay msecMaximum differential delay among links in msec.

Range: 1 through 56

Default: 25

frame-length (32 |64 |128 |256)IMA frame length in number of cells.

Default: 128

frame-synchronizationIMA group frame synchronization selection.
alpha numberNumber of consecutive invalid ICP cells for IFSM.

Range: 1 through 2

Default: 2

beta numberNumber of consecutive errored ICP cells for IFSM.

Range: 1 through 2

Default: 2

gamma numberNumber of consecutive valid ICP cells for IFSM.

Range: 1 through 5

Default: 1

minimum-links numberIMA group minimum active links.

Range: 1 through 8

Default: 1

symmetry (symmetrical-config-and-operation | symmetrical-config-asymmetrical-operation)IMA group symmetry mode selection.
test-procedureSpecify an IMA link interface test.
ima-test-startStart IMA group test.
ima-test-stopStop IMA group test.
interface nameInterface name of the IMA link to test.
pattern numberIMA test pattern.

Range: 1 through 254

Default: 170

period secondsLength of IMA pattern test in seconds.

Range: 1 through 4,294,967,294.

Default: 10

transmit-clock (common |independent)Transmit clock configuration.

Default: 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.