Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 361)

Multi-Service IronWare Switching Configuration Guide 331
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IEEE 802.1D Spanning Tree Protocol (STP)
12
State 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.
Design Cost 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.
Designated Root The root bridge as recognized on this port. The value is the same as the root
bridge ID listed in the Root ID field.
Designated Bridge The bridge as recognized on this port.
TABLE 53 CLI display of STP information (Continued)
This field... Displays...