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Allied Telesis AT-9724TS Manual

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Figure 6- 32.STP Instance Operational Status – Previously Configured MSTI
The following parameters may be viewed in the
STP Instance Operational Status windows:
Parameter Description
Designated Root Bridge This field will show the priority and MAC address of the Root Bridge.
External Root Cost This defines a metric that indicates the relative cost of forwarding packets to the specified port list.Port cost
can be set automatically or as a metric value.The default value is 0 (auto).
0 (auto) – Setting 0 for the external cost will automatically set the speed for forwarding packets to the specified
port(s) in the list for optimal efficiency.Default port cost:100Mbps port = 200000.Gigabit port = 20000.
value 1-200000000 – Define a value between 1 and 200000000 to determine the external cost.The lower the
number,the greater the probability the port will be chosen to forward packets.
Regional Root Bridge This field will show the priority and MAC address of the Regional (Internal) Root Bridge.This MAC address
should be the MAC address of the Switch.
Internal Root Cost This parameter is set to represent the relative cost of forwarding packets to specified ports when an interface
is selected within a STP instance.The default setting is 0 (auto).There are two options:
0 (auto) – Selecting this parameter for the internalCost will set quickest route automatically and optimally for an
interface
.The default value is derived from the media speed of the interface.
value 1-2000000 – Selecting this parameter with a value in the range of 1-2000000 will set the quickest route
when a loop occurs.A lower Internal cost represents a quicker transmission.
Designated Bridge This field will show the priority and MAC address of the Designated Bridge.The information shown in this table
comes from a BPDU packet originating from this bridge.
Root P
ort
This is the por
t on the Switch that is physically connected to the Root Bridge.
Max Age The Max Age ma
y be set to ensur
e that old inf
ormation does not endlessl
y cir
culate through redundant
paths in the network,preventing the effective propagation of the new information.Set by the Root Bridge,this
value will aid in determining that the Switch has spanning tr
ee configuration values consistent with other
devices on the bridged LAN.If the value ages out and a BPDU has still not been received from the Root Bridge,
the Switch will start sending its own BPDU to all other switches for permission to become the Root Bridge.If
it turns out that your switch has the lowest Bridge Identifier,it will become the Root Bridge.The user may
choose a time betw
een 6 and 40 seconds.
The default value is 20.
F
orw
ard Delay
The F
orw
ard Delay
can be fr
om 4 to 30 seconds.
Any port on the Switch spends this time in the listening
state while mo
ving fr
om the blocking state to the f
orwar
ding state
.
Last Topology Change This field shows the time,in seconds,since the last spanning tree topology change.
Topology Changes Count This field displays the number of times that the spanning tree topology has changed since the original initial
boot up of the Switch.
50
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch
… 51 …


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