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Question 178

Refer to the exhibit. After an engineer configures an EtherChannel between switch SW1 and switch SW2, this error message is logged on switch SW2:

SW2#

09:45:32: %PM-4-ERR_DISABLE: channel-misconfig error detected on Gi0/0, putting Gi0/0 in err-disable state

09:45:32: %PM-4-ERR_DISABLE: channel-misconfig error detected on Gi0/1, putting Gi0/1 in err-disable state

Based on the output from switch SW1 and the log message received on switch SW2, what action should the engineer take to resolve this issue?

    Correct Answer: B

    The error message and the EtherChannel summary on SW1 indicate that while the Port Channel (Po1) exists, no port members have been configured for it. This lack of member ports is causing SW2 to place interfaces Gi0/0 and Gi0/1 in an error-disabled state due to channel misconfiguration. To resolve this, the engineer should define the correct port members on the EtherChannel on switch SW1.

Discussion
HK010Option: B

B because even if it's a wrong protocol, you will get to see the ports that are configured with the command SHOW..... like this SW1#show etherchannel summary | begin Group Group Port-channel Protocol Ports ------+-------------+-----------+----------------------------------------------- 1 Po1(SD) LACP Fa0/13(I) Fa0/14(I) SW2#show etherchannel summary | begin Group Group Port-channel Protocol Ports ------+-------------+-----------+----------------------------------------------- 1 Po1(SD) PAgP Fa0/13(I) Fa0/14(I)

bendarkel

Are the ports expected to show up in the "show etherchannel summary" output even with a wrong/mismatched channel negotiation protocol?

echipbk

According to the output from SW1, there are no port configured yet. It means only the below command was configured: # int port-channel 1 # exit So, essentially, the port-channel exists without any members inside it, then whatever configurations are done on either side won't affect each other, which means there won't be such message displayed on the console in the first place.

echipbk

Which means the correct answer is A

echipbk

Sorry, my bad. Forget what I said. But I think the correct answer is A

kg2280

The correct answer is B. Just like you said po1 on sw1 have no members. This why sw2 had the port putted in errdisable. sw2 is already in mode on, just like sw1. The only that is missing, is the port on sw1. After this, you shut / no shut the port on sw2 and it should be good. With lacp or pagp, the port-channel wneed to negotiate to come up. Until the port-channel come up, all the ports are in stand-alone

ABC123Option: B

Should be B, there's no ports in show output

bendarkel

Are the ports expected to show up in the "show etherchannel summary" output even with a wrong/mismatched channel negotiation protocol?

mgiuseppe86

Yes SW12(config-if)#do show etherchannel summary Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports ------+-------------+-----------+----------------------------------------------- 1 Po1(SU) - Gi0/0(P) Gi0/1(P)

BurikOption: B

It's B, lab it. If you just create a Po1 interface without defining any ports, they won't show up in the output: SW1#show etherchannel summary [..] Group Port-channel Protocol Ports ------+-------------+-----------+----- 1 Po1(SD) - Once SW2 starts receiveing BPDU on its Po1 it will err-disable the ports: *Jun 10 14:24:33.017: %PM-4-ERR_DISABLE: channel-misconfig (STP) error detected on Po1, putting Et0/0 in err-disable state *Jun 10 14:24:33.017: %PM-4-ERR_DISABLE: channel-misconfig (STP) error detected on Po1, putting Et0/1 in err-disable state *Jun 10 14:24:33.018: %PM-4-ERR_DISABLE: channel-misconfig (STP) error detected on Po1, putting Po1 in err-disable state

aatechlerOption: A

A is correct

jorg32Option: B

No member ports seen

ERGEGAOption: B

On switch one the configuration on the ports g0/0-1 "channel-group 1 mode active " don`t exist. So if you run on switch one "show etherchannel summary" then you`ll get the output as the image. The answer B is more appropriate...

marco74_biOption: B

The output of the command doesn't any port related to the Port channel 1

HaidaryOption: A

A is correct

NewLife77Option: A

This question is about etherchannels. Answer is A

ManvekOption: A

Configuring the protocol means adding the channel. If no channel is added to the ercherchannel, then no protocol is configured.

NetworkfateOption: B

see the output log there is no port is shut or up state ,So its clearly saying that , it just cresated port chaneel on global config , not yet interface configuration has started So answer would be define correct port member on sw1

JochenStackerOption: B

There are no ports in the ehterchannel summary

teikitizOption: A

the exhibit will be valid only if the Po1 interface is set and no protocol nor members defined on interface view. B says "Define the correct port members on the EtherChannel on switch SW1", which would assume some ports had already been set, and would result on a different exhibit. Choosing A will both set the adequate protocol and port members. My 1 cent.

[Removed]Option: B

Answer is B Exhibit shows that the port-channel 1 does not have members configured.

[Removed]Option: B

B. The show command shows that there is no interfaces as members of the port-channel

KevA_KevOption: A

A is the correct answer. What is not be shown in the screenshot is the other has only channel-protocol pagp command configured under the interfaces while sw2 interfaces have channel-group 1 mode on configured so no protocol is configured on sw2 while sw1 is saying we use pagp. I tested in lab and got exact same outputs in the question …err-disable message and ether channel shows no ports configured on. If try adding the channel-group 1 mode on the interfaces on sw1 then will get an error stating “channel protocol mismatch for interface gi0/0…. Would need to remove the the channel-protocol command first

HungarianDish

Please do not spam us with chat gpt answers. This is not a valid source for CCNP context.