When creating a vlan, I get a loop after 1 hour in network. How can I check it?

[MUNIR_ENG]

hello Guys , I have added new switch type Summit X450-24x DC in my network , when i creating any Vlan after 1 hours loop happen in network , why that happened , Is there commanded or method to shows me where the defect was?

[MUNIR_ENG]

*Apr 14 02:05:53.689: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on Gigab itEthernet0/3.

*Apr 14 02:05:53.689: %PM-4-ERR_DISABLE: loopback error detected on Gi0/3, putti

ng Gi0/3 in err-disable state

*Apr 14 02:05:54.713: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEth

ernet0/3, changed state to down





*Apr 14 02:29:05.485: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on Gigab

itEthernet0/3.

*Apr 14 02:29:05.485: %PM-4-ERR_DISABLE: loopback error detected on Gi0/3, putti

ng Gi0/3 in err-disable state

*Apr 14 02:29:06.500: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEth

ernet0/3, changed state to down

[MUNIR_ENG]

thank you

[Jeremy_Gibbs]

https://supportforums.cisco.com/document/20111/error-ethcntr-3-loopbackdetected-catalyst-switch-runs-cisco-iosr-softwarE

[MUNIR_ENG]

i got on this massage , what mean and how i can fixing? this massage from Cisco switch ,its linking directly with extreme switch