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Community Member

VLAN flapping

Hi,

We are using 3750 switch as core switch, and we are getting an error message VLAN flapping between two switch ports can any one advicxe the cause of this.

3 REPLIES

Re: VLAN flapping

Hi

this is related to STP loop,check for the uplink or redundant connections.

Thanks

Mahmood

Community Member

Re: VLAN flapping

HI,

I identified the loop and shut down the PC. Its was generating the below error. What exactly is the cause of the error. There was a laptop connected on that port.

FastEthernet0/14 relearning 18 addrs per min

May 7 04:53:44.589 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/14 relearning 27 addrs per min

Re: VLAN flapping

Hi

This is the error message when there is a loop in the network.Usually a port learns one address if it is access port.if it is trunk port it will have many address but it not learn so fast.

Thanks

Mahmood

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