ZyXEL Communications IES-1248-71, User Manual

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Chapter 25 Spanning Tree Protocol
IES-1248-71/73 User’s Guide
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25.3 Spanning Tree Protocol Screen
To open this screen, click Advanced Application , Spanning Tree Protocol , STP Config .
Root port ID This is the priority and number of the port on the switch through which this
switch must communicate with the root of the Spanning Tree. “0x0000” displays
when this device is the root switch.
Root max age
(second)
This is the maximum time (in seconds) the root switch can wait without receiving
a configuration message before attempting to reconfigure.
Root hello time
(second)
This is the time interval (in seconds) at which the root switch transmits a
configuration message. The root bridge determines Hello Time, Max Age and
Forwarding Delay .
Root forward delay
(second)
This is the time (in seconds) the root switch will wait before changing states
(that is, listening to learning to forwarding).
Max age (second) This is the maximum time (in seconds) the IES-1248 can wait without receiving
a configuration message before attempting to reconfigure.
Hello time (second) This is the time interval (in seconds) at which the IES-1248 transmits a
configuration message. The root bridge determines Hello Time, Max Age and
Forwarding Delay .
Forward delay
(second)
This is the time (in seconds) the IES-1248 will wait before changing states (that
is, listening to learning to forwarding).
Port Status This identifies the IES-1248’s ports that support the use of STP.
State This field displays the port’s RSTP (or STP) state. With RSTP, the state can be
discarding , learning or forwarding . With STP, the state can be disabled ,
blocking , listening , learning , or forwarding .
Disabled appears when RSTP has not been turned on for the individual port or
the whole device.
Port ID This is the priority and number of the port on the switch through which this
switch must communicate with the root of the Spanning Tree. “0x0000” displays
when this device is the root switch.
Path cost This is the path cost from this port to the root switch.
Cost to root This is the path cost from the root port on this switch to the root switch.
Designated bridge This is the unique identifier for the bridge that has the lowest path cost to reach
the root bridge, consisting of bridge priority plus MAC address.
Designated port This is the port on the designated bridge that has the lowest path cost to reach
the root bridge, consisting of bridge priority.
Poll Interval(s)
Set Interval The text box displays how often (in seconds) this screen refreshes. You may
change the refresh interval by typing a new number in the text box and then
clicking Set Interval .
Stop Click Stop to halt STP statistic polling.
Table 50 Spanning Tree Protocol Status (continued)
LABEL DESCRIPTION