i have two 3548 daisy chained together and am getting the following error "%RTD-1-LINK_FLAP: FastEthernet0/47 link down/up 5 times per min" on one of them. did not get an error in log on the 3548 connected to this port. this occured for about 5 minutes. both switches are up. i have seen this before, but never between 2 switches.