Network Loop emergency

[ecafracs]

I'd been receiving this error in my switches, Im trying to determine which device and to which switch the error has been originating from but in vain,
%RTD-1-ADDR_FLAP: FastEthernet0/19 relearning 5 addrs per min

can anybody in here recommend a detailed approach on how i'd be able to resolve the issue.

 

[IPKONFIG]

You say "switches" like you have multiple ones that are doing this? Or is it just this one port? Did this message just now start or has it being doing this for awhile?

 

[IPKONFIG]

Normally, MAC addresses are learned once on a port. Occasionally, when a switched network reconfigures, due to either manual or STP reconfiguration, addresses learned on one port are relearned on a different port. However, if there is a port anywhere in the switched domain that is looped back to itself, addresses will jump back and forth between the real port and the port that is in the
path to the looped back port.

What you need to do is determine the real path (port) to the MAC address. Use the debug ethernet-controller addr command to see the alternate path-port on which the
address is being learned. Go to the switch attached to that port. Note that the show cdp neighbors command is useful in determining the next switch. Repeat this procedure until the port is found that is receiving what it is transmitting, and remove that port from the network.

 

[fynx]

Hi - what is your network topology? what switches are you using, let me guess... 6500's as a core with 3500's / 2900's as workgroup switches???

If everything is coming your way then you're in the wrong lane.