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Exam 350-401 topic 1 question 178 discussion

Actual exam question from Cisco's 350-401
Question #: 178
Topic #: 1
[All 350-401 Questions]


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?

  • A. Configure the same protocol on the EtherChannel on switch SW1 and SW2.
  • B. Define the correct port members on the EtherChannel on switch SW1.
  • C. Correct the configuration error on Interface Gi0/0 on switch SW1.
  • D. Correct the configuration error on Interface Gi0/1 on switch SW1.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by ABC123 at April 17, 2021, 5:19 p.m.

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HK010
Highly Voted 3 years, 11 months ago
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)
upvoted 36 times
echipbk
2 years, 5 months ago
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.
upvoted 5 times
echipbk
2 years, 5 months ago
Which means the correct answer is A
upvoted 4 times
echipbk
2 years, 5 months ago
Sorry, my bad. Forget what I said. But I think the correct answer is A
upvoted 1 times
kg2280
2 years, 2 months ago
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
upvoted 6 times
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bendarkel
2 years, 5 months ago
Are the ports expected to show up in the "show etherchannel summary" output even with a wrong/mismatched channel negotiation protocol?
upvoted 2 times
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ABC123
Highly Voted 4 years, 2 months ago
Should be B, there's no ports in show output
upvoted 18 times
bendarkel
2 years, 5 months ago
Are the ports expected to show up in the "show etherchannel summary" output even with a wrong/mismatched channel negotiation protocol?
upvoted 1 times
mgiuseppe86
1 year, 9 months ago
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)
upvoted 1 times
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N88
Most Recent 5 months, 1 week ago
Selected Answer: B
Just replicated it on a lab and this is the result if SW2 has trunk mode ON and there are no ports on the other side. It goes to err-disable due to the etherchannel missconfig feature enabled.
upvoted 1 times
N88
5 months, 1 week ago
Et0/1 to SW1 err-disabled trunk auto auto unknown Et0/2 to SW1 connected trunk auto auto unknown Et0/3 to SW1 connected trunk auto auto unknown Et1/0 to PC2 connected 11 auto auto unknown Et1/1 connected 1 auto auto unknown Et1/2 connected 1 auto auto unknown Et1/3 connected 1 auto auto unknown Po1 err-disabled trunk auto auto Po2 connected trunk auto auto
upvoted 1 times
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davdtech
9 months, 1 week ago
The error message is channel misconfig. I think the answer is in the tricky questions cisco provide. Not sure if there are miss matched protocols if the member ports are shown. It could be not because they use different modes . I will choose A
upvoted 1 times
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05b11e1
10 months, 3 weeks ago
Selected Answer: B
tried in lab, if tehre is no interface then the channel-group is not configured under interface
upvoted 1 times
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aatechler
11 months, 1 week ago
Selected Answer: A
A is correct
upvoted 1 times
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jorg32
1 year ago
Selected Answer: B
No member ports seen
upvoted 1 times
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ERGEGA
1 year ago
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...
upvoted 1 times
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marco74_bi
1 year, 4 months ago
Selected Answer: B
The output of the command doesn't any port related to the Port channel 1
upvoted 1 times
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Haidary
1 year, 5 months ago
A is correct
upvoted 1 times
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NewLife77
1 year, 9 months ago
Selected Answer: A
This question is about etherchannels. Answer is A
upvoted 1 times
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Manvek
1 year, 10 months ago
Selected Answer: A
Configuring the protocol means adding the channel. If no channel is added to the ercherchannel, then no protocol is configured.
upvoted 1 times
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Networkfate
1 year, 10 months ago
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
upvoted 1 times
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JochenStacker
1 year, 10 months ago
Selected Answer: B
There are no ports in the ehterchannel summary
upvoted 1 times
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teikitiz
1 year, 11 months ago
Selected Answer: 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.
upvoted 1 times
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[Removed]
1 year, 11 months ago
Selected Answer: B
Answer is B Exhibit shows that the port-channel 1 does not have members configured.
upvoted 1 times
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[Removed]
1 year, 11 months ago
Selected Answer: B
B. The show command shows that there is no interfaces as members of the port-channel
upvoted 1 times
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