Dell PowerConnect B-FCXs, Руководство по настройке

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PowerConnect B-Series FCX Configuration Guide 221
53-1002266-01
Configuring standard STP parameters
8
Displaying detailed STP information for a single port in a specific VLAN
Enter a command such as the following to display STP information for an individual port in a
specific VLAN.
Port number and STP state The internal port number and the port STP state.
The internal port number is one of the following:
•
The port interface number, if the port is the designated port for the LAN.
•
The interface number of the designated port from the received BPDU, if
the interface is not the designated port for the LAN.
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 administratively 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 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.
NOTE: If the state is DISABLED, no further STP information is displayed for
the port.
Port Path cost The STP path cost for the port.
Port Priority This STP priority for the port. The value is shown as a hexadecimal number.
Root The ID assigned by STP to the root bridge for this spanning tree.
Designated Bridge The MAC address of 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.
Designated Port The port number sent from the designated bridge.
Designated Path Cost The cost to the root bridge as advertised by the designated bridge that is
connected to this port. If the bridge is the root bridge itself, then the cost is 0.
The identity of the designated bridge is shown in the Designated Bridge field.
Active Timers The current values for the following timers, if active:
•
Message age – The number of seconds this port has been waiting for a
hello message from the root bridge.
•
Forward delay – The number of seconds that have passed since the last
topology change and consequent reconvergence.
•
Hold time – The number of seconds that have elapsed since
transmission of the last Configuration BPDU.
BPDUs Sent and Received The number of BPDUs sent and received on this port since the software was
reloaded.
TABLE 51 CLI display of detailed STP information for ports (Continued)
This field... Displays...