ZyXEL Communications AAM1212, User Manual

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AAM1212 User’s Guide
130 Chapter 14 Spanning Tree Protocol
Our bridge ID This is the unique identifier for this bridge, consisting of bridge priority plus MAC
address. This ID is the same in Designated root ID if the AAM is the root switch.
Designated root ID This is the unique identifier for the root bridge, consisting of bridge priority plus
MAC address. This ID is the same in Our bridge ID if the AAM is the root switch.
Topology change
times
This is the number of times the spanning tree has been reconfigured.
Time since change This is the time since the spanning tree was last reconfigured.
Cost to root This is the path cost from the root port on this AAM to the root switch.
Root port ID This is the priority and number of the port on the AAM through which this AAM
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 AAM can wait without receiving a
configuration message before attempting to reconfigure.
Hello time
(second)
This is the time interval (in seconds) at which the AAM 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 AAM will wait before changing states (that is,
listening to learning to forwarding).
Port Status This identifies the AAM’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 AAM through which this AAM
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 AAM 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) 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 35 Spanning Tree Protocol: Status (continued)
LABEL DESCRIPTION