Cisco WS-C2950-24 Software Configuration Guide - Page 330

Error Message and Recovery Procedures Appendix A System Error Messages RTD Messages This section contains the Runtime Diagnostic (RTD) error messages. RTD-1-ADDR_FLAP [chars] relearning [dec] addrs per min Explanation 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. In this message, [chars] is the interface, and [dec] is the number of addresses being learnt. Action Determine the real path (port) to the MAC address. Use debug ethernet-controller addr 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. RTD-1-LINK_FLAP [chars] link down/up [dec] 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. A-10 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 78-6511-05