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    pm-4-err_disable – the switchport is down


    If an error occurs on your network, the professional series of Cisco switches would probably shutdown the the network port where the error is detected.
    Even if the error on the network is corrected, the network port is still down. You have to enable it manually.
    The switch is able to automatically enable the port. If the root error on the network remains, the port is immediately shutdown again.

    To check the configuration, use this command:
    show errdisable recovery

    If something is disabled, it means you manually have to activate the port if this specific error has occurred.

    It can all be done automatically with this commands:

    errdisable recovery cause udld
    errdisable recovery cause bpduguard
    errdisable recovery cause security-violation
    errdisable recovery cause channel-misconfig
    errdisable recovery cause pagp-flap
    errdisable recovery cause dtp-flap
    errdisable recovery cause link-flap
    errdisable recovery cause gbic-invalid
    errdisable recovery cause psecure-violation
    errdisable recovery cause dhcp-rate-limit
    errdisable recovery cause unicast-flood
    errdisable recovery cause vmps
    errdisable recovery cause storm-control
    errdisable recovery cause loopback
    errdisable recovery cause sfp-config-mismat

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