Switch port down\down

[yaredo70]

Hi All,

I have found one of the port has no night and it showed the interface down\down (notconnect) on the 2960 cisco switch. I tried to reload the switch and change the cable still not working. Any ideas?

Yared

[balaji.bandi]

Possible cause :

1. Port may be bad

2. Patch cable issue

3. try shut and no shut

still issue give below information :

show version

show interface x/x

show run interface x/x

show interface status

some tips :

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/12027-53.html

[yaredo70]

i have to check it if the port is bad or not but I tied shut and no shut and I tried by changing the cable. 

[balaji.bandi]

post below information as requested :

show version

show interface x/x

show run interface x/x

show interface status

Also when you reboot the switch post complete boot output.

[IP_Cartel]

Make sure to look for err disabled under the show int status.  If there is an err disable go on the interface and do a shut and no shut.   You will need to troubleshoot if it went into err disable mode what is causing that.  Ive had that happen a lot on optical connections with a of CRC's.

[yaredo70]

not seen err-disabled but i tried shut and no shut still not working.

[Martin L]

When you reload switch; it goes thru self-check including checking for bad ports, bad power over Ethernet, etc.

you should be able to see if there are errors or issues with ports, like bad port xyz will be listed.  Just make sure you connected via Console to see output.

Regards, ML
**Please Rate All Helpful Responses **

[Leo Laohoo]

Do this: 

1. Command:  test cable tdr interface <PORT>
2. Wait for approximately 5 to 7 seconds for the process to complete
3. Command:  show cable tdr interface <PORT>
4. Post the complete output to #3.