%LINK-3-UPDOWN: continuous message on random ports

[shain bharati]

Hi,

I have this log continuous since long time. There is no impact on network. but we would like to know why this messages are coming. 

Chassis Type : WS-C4507R+E

 Sup 8-E 10GE (SFP+), 1000BaseX (SFP)   WS-X45-SUP8-E 

Oct 3 09:01:57: %LINK-3-UPDOWN: Interface GigabitEthernet7/13, changed state to up
Oct 3 09:03:27: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:03:37: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:05:28: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to up
Oct 3 09:05:31: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to down
Oct 3 09:05:41: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to up
Oct 3 09:06:08: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to down
Oct 3 09:06:18: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to up
Oct 3 09:08:13: %LINK-3-UPDOWN: Interface GigabitEthernet6/36, changed state to up
Oct 3 09:08:44: %LINK-3-UPDOWN: Interface GigabitEthernet6/36, changed state to down
Oct 3 09:08:54: %LINK-3-UPDOWN: Interface GigabitEthernet6/36, changed state to up
Oct 3 09:10:50: %LINK-3-UPDOWN: Interface GigabitEthernet1/38, changed state to up
Oct 3 09:13:04: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:13:15: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:13:26: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:13:36: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:13:37: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to down
Oct 3 09:19:05: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down

thanks,

S

[Georg Pauwen]

Hello,

what is connected to these interfaces ? If there is nothing connected, you could configure 'no logging event link-status' on these interfaces in order to get rid of the log entries...

[shain bharati]

Hi,

Users are connected to all interfaces.

[balaji.bandi]

If connected interfaces to users, this is normal - until you see anything major logs.

as suggested if you do no like to see these logs disable, suggest to monitor only impacted service ports for major servers or device connected.

[Georg Pauwen]

Hello,

the log message is generated automatically whenever a port goes up or down. You said there is no network impact...what about the users connected to the ports, are they experiencing any problems ? What are the users doing when the ports go down ?

[shain bharati]

Hi,

we only see on interfaces where windows machines are connected. we do not see any logs for printers or access point.

users were complaining about the disconnection and we found that the DHCP lease time was 3 min instead 3 days. we changed to 3 days and now users have no issue but why we still see the message %LINK-3-UPDOWN:" on users ports.

thanks,
S

[Georg Pauwen]

Hello,

at what intervals are you getting these messages ? The logs will show up every time a user starts or disconnects his or her Windows machine...

[shain bharati]

Hi,

Normally Down to up time is 10 sec and up to down is random second. see the logs;

Oct 3 09:05:28: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to up
Oct 3 09:05:31: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to down
Oct 3 09:05:41: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to up
Oct 3 09:06:08: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to down
Oct 3 09:06:18: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to up
Oct 3 09:08:13: %LINK-3-UPDOWN: Interface GigabitEthernet6/36, changed state to up
Oct 3 09:08:44: %LINK-3-UPDOWN: Interface GigabitEthernet6/36, changed state to down
Oct 3 09:08:54: %LINK-3-UPDOWN: Interface GigabitEthernet6/36, changed state to up
Oct 3 09:10:50: %LINK-3-UPDOWN: Interface GigabitEthernet1/38, changed state to up
Oct 3 09:13:04: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:13:15: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:13:26: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:13:36: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:13:37: %LINK-3-UPDOWN: Interface GigabitEthernet1/33, changed state to down
Oct 3 09:19:05: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:19:15: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:19:25: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to down
Oct 3 09:19:34: %LINK-3-UPDOWN: Interface GigabitEthernet2/19, changed state to up
Oct 3 09:27:09: %LINK-3-UPDOWN: Interface GigabitEthernet6/2, changed state to up
Oct 3 09:31:39: %LINK-3-UPDOWN: Interface GigabitEthernet1/16, changed state to up
Oct 3 09:31:45: %LINK-3-UPDOWN: Interface GigabitEthernet1/16, changed state to down
Oct 3 09:31:55: %LINK-3-UPDOWN: Interface GigabitEthernet1/16, changed state to up
Oct 3 09:39:58: %LINK-3-UPDOWN: Interface GigabitEthernet1/6, changed state to down

[shain bharati]

Hi,

from down to up it is always 10 second and from up to down it is random seconds.

Thanks,

S

[balaji.bandi]

At this stage too immature to say what is wrong, If i were you, i pickup one of the port going up and down. Visit the user PC and monitor what is happening on the PC when the port go down in switch syslog. 

another question you seeing this issue recently, how long it is happening, what is the change ? to understand better.

[engineer467]

Hi, did you find the reason behind it?

I am facing same issue in my network.

[waiming]

Hi,

Can i know any solution for this? As i am facing this issue also, user randomly get disconnected from the switch ports as per checking from switch syslog, the ports is up and down.