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Configuring Spanning Tree Protocol (STP)
Table 5.3: CLI Display of STP Information (Continued)
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. he device or VLAN can reach the root bridge
using another port, whose state is FORWARDING. hen 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 bridge(s) in order to
determine the new topology. o 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.
Fwd Trans The number of times STP has changed the state of this port between
BLOCKING and FORWARDING.
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.
Design 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.
Design Bridge The designated bridge to which this port is connected. The
designated bridge is the device that connects the network segment on
the port to the root bridge.
This Field... Displays...
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USING THE WEB MANAGEMENT INTERFACE
To display STP information:
1. Log on to the device using a valid user name and password for read-only or read-write access. The System
configuration panel is displayed.
2. Click on the plus sign next to Monitor in the tree view to display the monitoring options.
3. Select the STP
link to display the STP bridge and port parameters.
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