Quick Reference Guide

PowerConnect B-Series TI24X Configuration Guide 101
53-1002269-02
Configuring standard STP parameters
6
Root Cost The cumulative cost from this bridge to the root bridge. If this device is the root
bridge, then the root cost is 0.
Root Port The port on this device that connects to the root bridge. If this device is the root
bridge, then the value is “Root” instead of a port number.
Priority Hex This device or VLAN STP priority. The value is shown in hexadecimal format.
NOTE: If you configure this value, specify it in decimal format. Refer to “Changing
STP bridge parameters” on page 96.
Max age sec The number of seconds this device or VLAN waits for a configuration BPDU from
the root bridge before deciding the root has become unavailable and performing a
reconvergence.
Hello sec The interval between each configuration BPDU sent by the root bridge.
Hold sec The minimum number of seconds that must elapse between transmissions of
consecutive Configuration BPDUs on a port.
Fwd dly sec The number of seconds this device or VLAN waits following a topology change and
consequent reconvergence.
Last Chang sec The number of seconds since the last time a topology change occurred.
Chg cnt The number of times the topology has changed since this device was reloaded.
Bridge Address The STP address of this device or VLAN.
NOTE: If this address is the same as the Root ID, then this device or VLAN is the
root bridge for its spanning tree.
Port STP parameters
Port Num The port number.
Priority Hex The port STP priority, in hexadecimal format.
NOTE: If you configure this value, specify it in decimal format. Refer to “Changing
STP port parameters” on page 97.
Path Cost The port STP path cost.
State The port 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 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.
Fwd Trans The number of times STP has changed the state of this port between BLOCKING
and FORWARDING.
TABLE 24 CLI display of STP information (Continued)
This field... Displays...