Foundry Networks Switch and Router Installation And Configuration Manual page 375

Timers: message age 20, forward delay 5, hold 5
BPDU: sent 5, received 0
For brevity, this example shows information for only two ports. The command displays information for all the ports
on the device.
Syntax: show span detail
The show span detail command shows the following information.
This Field...
Port number
STP state
Port path cost
Port priority
Designated root ID
Designated bridge ID
Designated port
Designated port path cost
December 2000
Table 12.5: CLI Display of Detailed STP Information for Ports
Displays...
The port number.
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 bridge(s) 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 port's STP path cost.
This port's STP priority. The value is shown as a hexadecimal
number.
The ID assigned by STP to the root bridge for this spanning tree.
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.
The port number sent from the designated bridge.
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.
Configuring Spanning Tree Protocol (STP) and IronSpan
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