User guide

4-23
Cisco WLAN Controller Web Interface User Guide
OL-7416-04
Chapter 4 Controller Menu Bar Selection
Ports
Command Buttons
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• Apply: Data is sent to the controller and made to take effect, but not preserved across a power cycle;
these parameters are stored temporarily in volatile RAM.
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STP State The port's current state as defined by application of the Spanning Tree
Protocol. This state controls what action a port takes on reception of a
frame. If the bridge has detected a port that is malfunctioning it places that
port into the broken state. For ports disabled by Spanning Tree mode, this
object has a value of disabled. The valid values are:
Disabled
Blocking
Listening
Learning
Forwarding
Broken
STP Port Designated Root The unique Bridge Identifier of the Bridge recorded as the Root in the
Configuration BPDUs transmitted by the Designated Bridge for the
segment to which the port is attached.
STP Port Designated Cost The path cost of the Designated Port of the segment connected to this port.
This value is compared to the Root Path Cost field in received Bridge
PDUs.
STP Port Designated
Bridge
The Bridge Identifier of the bridge that this port considers to be the
Designated Bridge for this port's segment.
STP Port Designated Port The Port Identifier of the port on the Designated Bridge for this port's
segment.
STP Port Forward
Transitions Count
The number of times this port has transitioned from the Learning state to
the Forwarding state.
STP Port Priority The value of the priority field contained in the first (in network byte order)
octet of the (2 octet long) Port ID. The other octet of the Port ID is given
by the value of the Port id. Valid values are from 0 to 255. The factory
default is 128.
STP Port Path Cost Mode Auto (use the STP Port Path Cost parameter) or User Configured.
STP Port Path Cost The contribution of this port to the path cost of paths towards the spanning
tree root that includes this port. 802.1D-1990 recommends that the default
value of this parameter be in inverse proportion to the speed of the attached
LAN. Valid values are from 0 to 65535. The factory default is 0, which
means the cost is adjusted for the speed of the port when the link comes up.
The value used is 100 for 10 Mbps ports, and 19 for 100 Mbps ports.
Table 4-16 Spanning Tree Protocol Configuration (continued)
Parameter Description