Link Flaps

[sjamison]

Do these hurt anything? If something keeps flapping alot, is there anyway to shut it down or do something about it?

I keep getting these messages from our syslog box. Hard setting the duplex/speed has had no effect nor keeping it set to auto negotiate.

2004-11-15 13:58:49 Local7.Alert xx.xx.xx.xx 4134: 1w4d: %RTD-1-LINK_FLAP: FastEthernet0/21 link down/up 15 times per min

[amitsin]

RTD-1-LINK_FLAP link down/up times per min

Explanation This message means that an excessive number of link down-up events has been noticed on this interface: [chars] is the interface, and [dec] is the number of times the link goes up and down. This might be the result of reconfiguring the port, or it might indicate a faulty device at the other end of the connection.

Action If someone is reconfiguring the interface or device at the other side of the interface, ignore this message. However, if no one is manipulating the interface or device at the other end of the interface, it is likely that the Ethernet transceiver at one end of the link is faulty and should be replaced.

Hope this helps !! :)