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Chapter 5
Configuring the Switch
38
48-Port 10/100 + 4-Port Gigabit Switch with WebView and Power over Ethernet
The Port Information displays the current status of the
ports in the Spanning Tree.
Port Displays the port number.
State Shows if Spanning Tree has been enabled on this
interface. To enable STP on a port click the state checkbox
for that port then click Save Settings to save the changes.
Status Displays current state of this port within the
Spanning Tree:
Discarding Port receives STA configuration messages,
but does not forward packets.
Learning Port has transmitted configuration messages
for an interval set by the Forward Delay parameter
without receiving contradictory information. Port
address table is cleared, and the port begins learning
addresses.
Forwarding Port forwards packets, and continues
learning addresses.
Role Roles are assigned according to whether the port
is part of the active topology connecting the bridge to
the root bridge (i.e., root port), connecting a LAN through
the bridge to the root bridge (i.e., designated port), or is
the MSTI regional root (i.e., master port); or is an alternate
or backup port that may provide connectivity if other
bridges, bridge ports, or LANs fail or are removed. The role
is set to disabled (i.e., disabled port) if a port has no role
within the spanning tree.
Forward Transitions The number of times this port has
transitioned from the Learning state to the Forwarding
state.
Operational Edge Port This parameter is initialized
to the setting for Administrative Edge Port in STP Port
Setting detail, but will be set to false if a BPDU is received
indicating that another bridge is attached to this port.
Click on Detail to configure STP Port Settings for an
interface.
Click Detail to configure Path Cost, Priority, Administrative
Edge Port (Fast Forwarding), and Administrative Link Type.
Use the text fields provided to edit the values, then click
Apply.
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Spanning Tree > STP Port Settings > STP Port Setting Detail
Designated Cost The cost for a packet to travel from this
port to the root in the current Spanning Tree configuration.
The slower the media, the higher the cost.
Designated Port The port priority and number of the
port on the designated bridging device through which the
Switch must communicate with the root of the Spanning
Tree.
Designated Bridge The bridge priority and MAC address
of the device through which this port must communicate
to reach the root of the Spanning Tree.
Path Cost This parameter is used by the STP to determine
the best path between devices. Therefore, lower values
should be assigned to ports attached to faster media, and
higher values assigned to ports with slower media. Path
cost takes precedence over port priority.
NOTE: When the Path Cost Method is set to
“short,” the maximum path cost is 65,535.
Range –
Ethernet: 200,000-20,000,000
Fast Ethernet: 20,000-2,000,000
Gigabit Ethernet: 2,000-200,000
Default –
Ethernet – Half duplex: 2,000,000; full duplex: 1,000,000;
LAG: 500,000
Fast Ethernet – Half duplex: 200,000; full duplex: 100,000;
LAG: 50,000
Gigabit Ethernet – Full duplex: 10,000; LAG: 5,000