Interface went error disabled mode - Cisco

[Madhu]

Hello Team,

I have replaced the cable, SFP but still the port going to be err-disabled mode. 

Please let me know the reason for the error-disabled.  The port connected to the Palo Alto Firewall on another side.

Model: C9300X-24Y

Logs:

SW#sh int status | i err
Fif2/1/0/36 *** Connected to P err-disabled 1 full 10G SFP-10GBase-SR
SW#

SW# show errdisable flap-values
ErrDisable Reason Flaps Time (sec)
----------------- ------ ----------
pagp-flap 3 30
dtp-flap 3 30
link-flap 5 10
SW#

SW#sh log | i 2/1/0/36
Mar 21 2024 15:47:53.262 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 15:47:54.262 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 15:49:02.568 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 15:49:04.699 IST: %PM-4-ERR_DISABLE: link-flap error detected on Fif2/1/0/36, putting Fif2/1/0/36 in err-disable state
Mar 21 2024 15:49:06.682 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 15:52:07.087 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 15:52:08.087 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 15:55:34.824 IST: %PM-4-ERR_DISABLE: link-flap error detected on Fif2/1/0/36, putting Fif2/1/0/36 in err-disable state
Mar 21 2024 15:55:34.869 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 15:55:36.063 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 15:57:39.272 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 15:57:40.272 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 16:14:20.981 IST: %PM-4-ERR_DISABLE: link-flap error detected on Fif2/1/0/36, putting Fif2/1/0/36 in err-disable state
Mar 21 2024 16:14:21.266 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 16:14:22.266 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 16:47:11.798 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 16:47:12.799 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 16:58:23.055 IST: %PM-4-ERR_DISABLE: link-flap error detected on Fif2/1/0/36, putting Fif2/1/0/36 in err-disable state
Mar 21 2024 16:58:23.543 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 16:58:24.543 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 17:00:30.000 IST: %PM-4-ERR_DISABLE: link-flap error detected on Fif2/1/0/36, putting Fif2/1/0/36 in err-disable state
Mar 21 2024 17:05:58.365 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 17:05:59.365 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 17:10:50.361 IST: %PM-4-ERR_DISABLE: link-flap error detected on Fif2/1/0/36, putting Fif2/1/0/36 in err-disable state
Mar 21 2024 17:10:51.003 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 17:10:52.003 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 17:35:41.882 IST: %LINK-5-CHANGED: Interface FiftyGigE2/1/0/36, changed state to administratively down
Mar 21 2024 17:35:46.097 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to down
Mar 21 2024 17:35:49.391 IST: %LINK-3-UPDOWN: Interface FiftyGigE2/1/0/36, changed state to up
Mar 21 2024 17:35:50.391 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface FiftyGigE2/1/0/36, changed state to up

[Reza Sharifi]

Hi,

Check the PA side to make sure the port duplex and speed are the same as the Cisco side.

HTH

[Richard Pidcock]

It would seem that something is not happy in the physical world.  Is it possible to move this connection to a different port or different ports on each side of the connection?

[MHM Cisco World]

It layer 1 issue' check cable' speed and duplex 

MHM

[Leo Laohoo]

Post the complete output to the following commands: 

sh interface FiftyGigE2/1/0/36 controll
sh platform pm interface-flap FiftyGigE2/1/0/36 | begin Sw LinkNeg State

[Madhu · Accepted solution]

thank you all, again I have replaced all the SFP both end and cables.

Now it's working as expected.