How to Monitor the Status of an Errdisabled Port by Using the Show Errdisable Recovery Command
The show errdisable recovery command is a command that will display information about the errdisable recovery feature running on the switch. This command can help us find out what error conditions this feature can handle, the wait time before the switch reactivates the errdisabled port, and the recovery status of the errdisabled port. The following is an example output of this command:
Switch# show errdisable recovery ErrDisable Reason Timer Status ----------------- -------------- link-flap Enabled bpduguard Enabled psecure-violation Enabled udld Enabled channel-misconfig Enabled Timer interval: 300 seconds Interfaces that will be enabled at the next timeout: Interface Errdisable reason Time left(sec) --------- ----------------- -------------- Gi1/0/1 link-flap 120 Gi1/0/2 bpduguard 180 Gi1/0/3 psecure-violation 240 Gi1/0/4 udld 300 Gi1/0/5 channel-misconfig 300
From the output above, we can see that the errdisable recovery feature is enabled for the five most common error conditions, namely link flapping, STP violation, Port Security violation, UDLD violation, and EtherChannel misconfiguration. In addition, we can also see that the wait time before the switch re-enables the errdisabled port is 300 seconds, and the recovery status of the errdisabled port, including the time remaining before the port is reactivated.
Using the above commands, we can monitor the status of the errdisabled port and the errdisable recovery feature running on the switch.
Conclusion
An errdisabled port is a port that has been disabled by the Cisco switch because an error condition is detected. Errdisabled ports can cause serious network interference, especially if they are connected to critical devices such as servers, routers, or end devices. Therefore, it is important to know how to address errdisabled ports and prevent them from happening in the future.
By understanding and applying the concepts we’ve learned, we can better manage errdisabled ports and improve the performance and reliability of our network.