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Port Error Disable and Auto Recovery for the EX Switch

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Article ID: KB15494 KB Last Updated: 03 Mar 2017Version: 2.0
Summary:
A port can be transition into error-disabled state due to several reasons such as violating MAC limit condition with a “shut down” action. In order to recover the port from such state the user can manually clear the error. 

Starting with JUNOS 9.6 users can define a disable-timeout value to automatically clear the error after specified timeout.
Symptoms:

Solution:
A port can be transition into an "error-disabled" state due to several reasons such as:
  • exceeding storm-control limit with “shut down” action (starting with JUNOS 9.6)
  • violating MAC limit condition with “shut down” action
  • exceeding MAC-move limit with “shut down” action
Such a condition(s) will effectively disable the port and link will be shut down if configured. In order to recover the port from such state the user can manually do the following:
  • Clear the error using clear ethernet-switching port-error, or
  • Disable the feature on the interface

NOTE: Disabling/re-enabling the affected interface will not clear the error-disabled state.


Users can also define a disable-timeout value to automatically clear the error after a specified timeout period. This is equivalent to manually clearing the port-error.

The following is an example with a disable-timeout value set to 60 seconds.

[edit]
root@EX# show ethernet-switching-options
port-error-disable {
       disable-timeout 60;
}
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