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Switchport flapping


wildweaselmi
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I 've got a problem with Catalyst 2980G. Ports on it have been flapping.


This problem concern only one switch in my network only one vlan. There are no errors on this ports, it seems like broadcast or unicast is flooding but I don't know how to fix it.



If the port is going down and up then I would check that PC for virus/spyware. Each time we have a port doing this it is because of an infected PC that is scanning every IP in existence as fast as it can.



If it is MAC address flapping between two ports, you may have a multi-nic server that needs etherchannel support from the switch.



If macs are flappiing between cross-over/trunks you may have some kind of loop or repeated fail-over.


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