# Disabling and Reenabling IOAs

Disabling an IOA on the E120 or E320 router has the same effect as removing that IOA from a slot. A disabled IOA cannot operate, although its configuration remains in NVS. To allow the IOA to operate, you must reenable it.

adapter disable

- Use to disable the IOA in the specified IOA bay.
- You can use this command to disable an IOA so that you can run diagnostic tests on it.
- On IOAs that support hot-swapping, issuing this command does not reboot the line module. On unsupported IOAs, issuing this command does reboot the line module associated with the IOA, but does not disable the line module. Issue the slot disable command to disable the line module. For a list of IOAs that support hot-swapping, see Table 39.
- When you issue the adapter disable command in a redundancy configuration, the line module (primary or spare) currently associated with that IOA is rebooted. If the IOA is protected by a line module redundancy group, an automatic line module redundancy switchover or revert can be triggered by the line module reboot. To prevent undesired line module redundancy actions, issue the redundancy lockout command for the primary line module slot before issuing the adapter disable command. For more information, see Line Module Redundancy in JunosE Services Availability Configuration Guide.
- In the software, adapter 0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router).
- Example—Disables the IOA residing in the upper bay of slot 5 in an E320 router
  host1(config)#adapter disable 5/0
- There is no no version.
- See adapter disable.

adapter enable

- Use to enable the IOA in the specified IOA bay.
- Enables you to restart the IOA that was installed in the slot.
- The default is enable.
- On IOAs that support hot-swapping, issuing this command does not reboot the line module. On unsupported IOAs, issuing this command reboots the line module associated with the IOA, but does not enable the line module. Issue the slot enable command to enable the line module. For a list of IOAs that support hot-swapping, see Table 39.
- When you issue the adapter enable command in a redundancy configuration, the line module (primary or spare) currently associated with that IOA is rebooted. If the IOA is protected by a line module redundancy group, an automatic line module redundancy switchover or revert can be triggered by the line module reboot. To prevent undesired line module redundancy actions, issue the redundancy lockout command for the primary line module slot before issuing the adapter enable command. For more information, see Line Module Redundancy in JunosE Services Availability Configuration Guide.
- In the software, adapter 0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router).
- Example—Enables the IOA residing in the upper bay of slot 5 in an E320 router
  host1(config)#adapter enable 5/0
- There is no no version.
- See adapter enable.