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Webcast-Catalyst9k
New Member

Ports continously changing state

Hello,

I have installed a new network all with 3750 switches. Everything is going well

except that some ports on some switches are going down and straight back up.

I'm using the Cisco Assistant to monitor the network and send me all the events.

This is how the event look 's like; Are these serious events / errors or can I just ignore them ?

X-Mailer: Cisco Network Assistant System Messages Notification Mailer

Device: OBL-SW-SK4

000084: Sep 9 13:32:35: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/15, changed state to down

X-Mailer: Cisco Network Assistant System Messages Notification Mailer

Device: OBL-SW-SK4

000085: Sep 9 13:32:36: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/15, changed state to down

X-Mailer: Cisco Network Assistant System Messages Notification Mailer

Device: OBL-SW-SK4

000086: Sep 9 13:32:38: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/15, changed state to up

X-Mailer: Cisco Network Assistant System Messages Notification Mailer

Device: OBL-SW-SK4

000087: Sep 9 13:32:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/15, changed state to up

Thanks for ant comments

Walter Dyck

2 REPLIES
Cisco Employee

Re: Ports continously changing state

Hi Walter,

Could you please let me know what is the device connected on this interface ? also please send me the output of the below commands.

Sh int gi1/0/15 | multiple times  in a span of 10 minutes.

sh inv

sh log

Regards,
Souvik

Bronze

Re: Ports continously changing state

Hello,

Please check speed/duplex settings on this local switch and on the remote device. Sometimes this ethernet interface flaps are created due an abnormal amount of broadcast traffic on them.

Regards.

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