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Hierarchy Level

  • For platforms with ELS:

  • For platforms without ELS:

Release Information

Statement introduced in Junos OS Release 9.0 for EX Series switches.

Hierarchy level [edit switch-options] introduced in Junos OS Release 13.2X50-D10 (ELS). (See Using the Enhanced Layer 2 Software CLI for information about ELS.)

Statement introduced in Junos OS Release 13.2X50-D15 for the QFX Series.


Configure a primary link and secondary link on trunk ports. If the primary link fails, the secondary link automatically takes over without waiting for normal spanning-tree protocol convergence.

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

system—To view this statement in the configuration.

system–control—To add this statement to the configuration.