Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.8.00 - Page 411

IEEE 802.1D Spanning Tree Protocol (STP) 12 TABLE 74 CLI display of STP information (Continued) This field... Displays... State Design Cost Designated Root Designated Bridge The port's STP state. The state can be one of the following: • BLOCKING - STP has blocked Layer 2 traffic on this port to prevent a loop. The device or VLAN can reach the root bridge using another port, whose state is FORWARDING. When a port is in this state, the port does not transmit or receive user frames, but the port does continue to receive STP BPDUs. • DISABLED - The port is not participating in STP. This can occur when the port is disconnected or STP is disabled on the port. • FORWARDING - STP is allowing the port to send and receive frames. • LISTENING - STP is responding to a topology change and this port is listening for a BPDU from neighboring bridges in order to determine the new topology. No user frames are transmitted or received during this state. • LEARNING - The port has passed through the LISTENING state and will change to the BLOCKING or FORWARDING state, depending on the results of STP's reconvergence. The port does not transmit or receive user frames during this state. However, the device can learn the MAC addresses of frames that the port receives during this state and make corresponding entries in the MAC table. The cost to the root bridge as advertised by the designated bridge that is connected to this port. If the designated bridge is the root bridge itself, then the cost is 0. The identity of the designated bridge is shown in the Design Bridge field. The root bridge as recognized on this port. The value is the same as the root bridge ID listed in the Root ID field. The bridge as recognized on this port. Displaying detailed STP information for each interface To display the detailed STP information, enter the following command at any level of the CLI. BigIron RX Series Configuration Guide 335 53-1002253-01