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Err-disabled Recovery Questions

November 25th, 2018 in SWITCH 300-115 Go to comments

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6


In order to turn on errdisable recovery and choose the errdisable conditions, issue this command:
cat6knative#errdisable recovery cause ?

gbic-invalid Enable timer to recover from invalid GBIC error disable state

Reference: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/69980-errdisable-recovery.html

Question 7

Question 8


This is the paragraph which describes about the “show errdisable recovery” command on Cisco website:

“If you have enabled errdisable recovery, you can determine the reason for the errdisable status if you issue the “show errdisable recovery” command. An example of the output of this command is shown below:

Switch#show errdisable recovery
ErrDisable Reason    Timer Status
-----------------    --------------
udld                 Enabled
bpduguard            Enabled
security-violatio    Enabled
channel-misconfig    Enabled
pagp-flap            Enabled
dtp-flap             Enabled
link-flap            Enabled
l2ptguard            Enabled
psecure-violation    Enabled
gbic-invalid         Enabled
dhcp-rate-limit      Enabled
mac-limit            Enabled
unicast-flood        Enabled
arp-inspection       Enabled

Timer interval: 300 seconds

Interfaces that will be enabled at the next timeout:

Interface      Errdisable reason      Time left(sec)
---------    ---------------------    --------------
  Fa2/4                bpduguard          273

Reference: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/69980-errdisable-recovery.html

So answer A seems to be correct but the above quote is very misleading. In fact, this command is used to verify which services/features were enabled for err-disable recovery (notice that the err-disable recovery feature is disabled by default for all services and features and we have to manually turn them on if we want to use via the command “errdisable recovery cause …”). If we allows all above services/features to automatically recover then we will not know the reason a port was error-disabled.

In fact, the best way to determine why a port is in the err-disabled state is to view the Syslog messages. For example:

%PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/1, putting Fa0/1 in err-disable state

This means Fa0/1 is put in err-disabled state because of a port security violation.

Note: The command “show errdisable detect” is used to identify which services are enabled for Errdisable only (for example, services like “arp-inspection”, bpduguard, UDLD,…)

Question 9


When a port is error-disabled, the LED associated with the port on the front panel is solid orange.

Reference: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/12017-20.html

Error-disabled is same as shut down state so all traffic on this port are stopped.

Question 10


When a port security is violated, that port can be put into errdisable state -> B is correct.

When a maximum number of hosts per port was reached, learning a new MAC address can put that port into errdisable state -> D is correct.

  1. tcp22
    December 4th, 2018

    A question about a fiber connected EtherChannel after the switches were powered on the ports went errdisable.
    A. Due to UDLD errdisable it.
    B. Due to EtherChannel misconfig.

    why B is not correct?

  2. driguilim
    December 5th, 2018

    Where can I see thi question about “Err-disabled Recovery Questions”? I’ve got the lastest download from the PDF questions (SWITCH_Nov_2019), but I didn’t found any topic about it.

  3. ccnp engineer
    December 10th, 2018

    Which errdisable recovery command option enables a device to recover from an incorrect SFT state?

    A. link-monitor-failure
    B. sfp-config-mismatch
    C. gbic-invalid
    D. port-mode-failure

    I think the answer should be C ( gbic-invalid) not A.

    Please verify and confirm..

    Reference link below…

  4. Anonymous
    December 12th, 2018

    @CCNP Engineer

    I thought the same thing when I read. Can someone confirm?

  5. patan
    December 15th, 2018

    i also think gbic-invalid is the correct answer. I donĀ“t see “link-monitor-failure” is a valid errdisable recovery command.
    Someone else could please confirm?

  6. Anonymous
    December 19th, 2018

    Which errdisable recovery command option enables a device to recover from an incorrect SFT state?
    A. link-monitor-failure
    B. sfp-config-mismatch
    C. gbic-invalid
    D. port-mode-failure

    Hi May i know the true answer to this one?
    says that the right answer is C.GBIC-INVALID however here in certprepare the answer is ‘A’


  7. Choochin
    December 22nd, 2018

    For question 8:

    You can issue a show log
    Check the Syslog server
    You can issue show errdisable recovery.

    show errdisable recovery is the preferred method because it’s the most straight forward when you are on the switch and the disablement may have cut access to a syslog server. It will show you all recovery options that are enabled and all current disabled ports.

  8. Anonymous
    January 10th, 2019

    Is Answers to Question 8 correct? I think it should be B & C?

  9. RS
    January 13th, 2019

    I am not able to understand where are the questions ?
    Where to find the questions ?

  10. RS
    January 13th, 2019

    Is it required to get registered to view the questions ?

  11. Nick
    January 16th, 2019

    Where can we find the questions ?

  12. Anonymous
    January 17th, 2019

    About the question 6, nobody knows if the correct answer is c?

    I really think that the option “c” is more suitable.

  13. Wastel
    January 21st, 2019

    Which errdisable recovery command option enables a device to recover from an incorrect SFT state?

    A. link-monitor-failure (abnormal SPAN Port usage )
    B. sfp-config-mismatch (might result from non-cisco compatible SFP)
    C. gbic-invalid
    D. port-mode-failure

    2960G# show errdisable detect

    ErrDisable Reason Detection Mode
    —————– ——— —-
    bpduguard Enabled port
    channel-misconfig Enabled port
    community-limit Enabled port
    dhcp-rate-limit Enabled port
    dtp-flap Enabled port
    gbic-invalid Enabled port
    inline-power Enabled port
    invalid-policy Enabled port
    link-flap Enabled port
    loopback Enabled port
    lsgroup Enabled port
    mac-limit Enabled port
    pagp-flap Enabled port
    port-mode-failure Enabled port
    secure-violation Enabled port/vlan
    security-violation Enabled port
    sfp-config-mismatch Enabled port
    small-frame Enabled port
    storm-control Enabled port
    udld Enabled port
    vmps Enabled port

    Which one is related to “SFT state” ??? is it a typo??? SFP=SmallFormfactorTranceiver

    A. Solution: check if you have a monitor port configuration on the switch (SPAN Port)
    #sh monitor detail (can’t see any relation to SFT)
    B. Solution: configuration to allow SFPs that do not pass IOS’s check for Cisco SFPs.

    Router(config)# service unsupported-transceiver
    Router(config)# no errdisable detect cause gbic-invalid
    Router(config)# errdisable recovery cause gbic-invalid
    Router(config)# no errdisable detect cause sfp-config-mismatch
    Router(config)# errdisable recovery cause sfp-config-mismatch

    C. GBICs -see B.
    D. might be related toTrunk configuration (can’t see any relation to SFT)
    At least not matching native vlan trunk configurations of two connected switches will cause security issues. Trunkports might be disabled if detected and err-disabled is enabled (Haven’t testet it on two real switches yet)

    My tip for this Question: its a typo – read it:

    Which errdisable recovery command option enables a device to recover from an incorrect SFP state? – B

  14. Anonymous
    January 29th, 2019

    I just take the exam today and I fail, just to let you know thaht the IPHelper guide and the Pass Leader document that has 5 PDF are not enough. There are a lot of question that are not in these guides, Just study more and looking for new questions guides :( :(

  15. ugurdy
    February 2nd, 2019

    I agree with Wastel. It is probably a typo and should be “SFP State” and since it can be either GBIC or SFP, then the answer should be “B”.

  16. junborg
    February 25th, 2019

    In Question 10: learned a new MAC address is the same and part of a port security violation!!!! sticky-mac-address

    A. It is connected to a host with an NIC that is unable to recognize
    B. The switch incurred a port security violation
    C. It detected a collision
    D. It learned a new MAC address
    E. It detected a peer with a matching duplex

  17. Muhamad
    March 15th, 2019

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    Few new questions, dump valid. Thanks certprepare!

    My email: muhamadawan1988(at)gmail(dot)com

  18. supportdonkey
    March 24th, 2019

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  19. Vivid
    April 9th, 2019

    Good Day,

    Can someone please assist with providing the questions?

  20. Vivid
    April 9th, 2019

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  21. Han
    April 30th, 2019

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  22. Anonymous
    July 21st, 2019


    There are various reasons for the interface to go into errdisable. The reason can be:
    Duplex mismatch <<<>> Answer B

    I think B and E are better choices.

  23. supportdonkey
    August 1st, 2019

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