Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide ...

9Port mirroring and monitoring[loop_detect_lp_ipc_control] rx opcode=3loop_detect_process_loop_detected: (2/5 VLAN: 13 ) sending_port Inv type 2Dec 1 01:21:08 loop_detect_process_loop_detected: loop detect is shutting port2/5 VLAN: 13[loop_detect_lp_ipc_control] rx opcode=3loop_detect_process_loop_detected: (2/7 VLAN: 13 ) sending_port Inv type 2Dec 1 01:21:08 loop_detect_process_loop_detected: loop detect is shutting port2/7 VLAN: 13The following command example displays loop detect detail messages.Brocade# debug loopdetect detailloop_detect_send_bpdu: i/f 2/5 stp state is blocking, do not send loop-detectloop_detect_send_bpdu: send loop-detect to port Inv VLAN: 13loop_detect_send_bpdu: i/f 2/5 stp state is blocking, do not send loop-detectloop_detect_send_bpdu: send loop-detect to port Inv VLAN: 13loop_detect_send_bpdu: i/f 2/5 stp state is blocking, do not send loop-detectloop_detect_send_bpdu: send loop-detect to port Inv VLAN: 13loop_detect_send_bpdu: i/f 2/5 stp state is blocking, do not send loop-detectloop_detect_send_bpdu: send loop-detect to port Inv VLAN: 13loop_detect_send_bpdu: i/f 2/5 stp state is blocking, do not send loop-detectloop_detect_send_bpdu: send loop-detect to port Inv VLAN: 13loop_detect_send_bpdu: i/f 2/5 stp state is blocking, do not send loop-detConfiguration notesThe following information applies to Loose mode loop detection:• Loop detection is configured on the VLAN. Different VLANs may disable different ports.• Loose mode can disable multiple ports of a loop. A disabled port affects every VLAN using it.• Loose mode disables the receiving port if packets originate from any port or member port of aVLAN on the same device.• The VLAN of the receiving port must be configured for loop detection in order to disable theport.• Loose mode floods test packets to the entire VLAN. This can impact system performance if toomany VLANs are configured for Loose mode loop detection.The following information applies to Strict mode loop detection:• A port is disabled only if a packet is looped back to that same port. Loop detection must beconfigured on the physical port.• Strict mode overcomes specific hardware issues where packets are echoed back to the inputport.Port mirroring and monitoringYou can monitor the traffic on the Brocade ports by configuring another port to mirror the traffic onthe ports you want to monitor. The port thus configured is called a mirror port. By attaching aprotocol analyzer to the mirror port, you can observe the traffic on the monitored ports.310 Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide53-1002426-02