Ethernet Switches & Routers

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Posts: 1
Registered: ‎10-13-2010

Link-up, Link-down notification

Hi,

I have a question regarding some events on many of our switches. The events in question are shown as "link-down notification" followed almost instantly by a "link-up notification". Here's a very small sample of much bigger log file.

07:09:17 05/23/2012

   "Unit 1, Port  5 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:09:15 05/23/2012

   "Unit 1, Port  5 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:09:04 05/23/2012

   "Unit 1, Port 43 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:09:02 05/23/2012

   "Unit 1, Port 43 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:09:00 05/23/2012

   "Unit 1, Port  5 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:08:58 05/23/2012

   "Unit 1, Port  5 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:08:56 05/23/2012

   "Unit 1, Port  5 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:08:54 05/23/2012

   "Unit 1, Port  5 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:08:38 05/23/2012

   "Unit 1, Port  5 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:08:36 05/23/2012

   "Unit 1, Port  5 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:00:53 05/23/2012

   "Unit 1, Port 35 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

07:00:51 05/23/2012

   "Unit 1, Port 35 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

04:46:39 05/23/2012

   "Unit 1, Port 48 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

04:46:23 05/23/2012

   "Unit 1, Port 48 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

22:43:53 05/22/2012

   "Unit 1, Port 29 link-up notification."

   level: 6, module: 5, function: 1, and event no.: 1

22:43:50 05/22/2012

   "Unit 1, Port 29 link-down notification."

   level: 6, module: 5, function: 1, and event no.: 1

As you can see, the up-down events on a single port usually shows up right after the other, with 2-3 seconds delay. There is all kind of peripherals connected on these ports (workstations, medical equipments, printers, etc.) and these events show up on almost all our switches. There isnt an impact on users, else I would I've heard about it, but on some occasion I wonder if some of our glichts could be cause by those small "deconnection".

Any light on these events would be much appreciated.

New Contributor
Posts: 4
Registered: ‎05-09-2012

Re: Link-up, Link-down notification

On my recent deployment of BI-RX-8's I had the same issue when connecting certain manufacture's lan cards.  We tracked it down to issues with auto-negotate on the links. Some intel boards had out of date linux drivers and worked fine after we updated the,  With some older sun v20z I had to change to speed to 100-full from auto.

I hope that helps.

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