Interface up/down randomly

DeanL01 — Sat, 09 Mar 2019 00:57:46 GMT

Dear experts

this port is a member of port-channel,it always shows below message in log,but the other end has no issue.There's no mismatch of speed and duplex on both ends. Anyone could advise why it happens? Thanks a lot!

002437: Jan 6 21:32:30.848 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to down
002438: Jan 6 21:32:32.794 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to down
002439: Jan 6 21:32:38.859 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to up
002440: Jan 6 21:32:42.541 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to up
002441: Jan 6 22:01:47.010 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to down
002442: Jan 6 22:01:48.965 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to down
002443: Jan 6 22:01:55.022 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to up
002444: Jan 6 22:01:59.090 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to up
002445: Jan 7 00:00:49.385 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to down
002446: Jan 7 00:00:51.339 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to down
002447: Jan 7 00:00:59.535 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to up
002448: Jan 7 00:01:03.075 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to up
002449: Jan 7 00:29:41.349 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to down
002450: Jan 7 00:29:43.303 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to down
002451: Jan 7 00:29:51.373 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet0/26, changed state to up
002452: Jan 7 00:29:55.039 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/26, changed state to up

Re: Interface up/down randomly

luis_cordova — Mon, 07 Jan 2019 05:27:28 GMT

Hi @DeanL01,

Please, review this other conversation, it can be helpful:

https://community.cisco.com/t5/switching/c3750-stack-lineproto-5-updown-all-three-seconds/td-p/1453670

Regards

Re: Interface up/down randomly

Leo Laohoo — Mon, 07 Jan 2019 06:07:51 GMT

Look at the time and date. The down/up or up/down are spread too far apart.
Normally I see behaviours like this when computers go to sleep/hibernation or when the user logs out.

Re: Interface up/down randomly

Fulvio Ferreira — Mon, 07 Jan 2019 11:45:33 GMT

What is the switch model? Did you try to test the copper cables?

If applicable, try to use the following commands to test the cables:

#test cable-diagnostics tdr interface gi0/26
#show cable-diagnostics tdr interface gi0/26

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