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TRENDnet User’s Guide
Industrial Managed Switch Series
81
Backup - A backup/redundant path to a segment where another bridge port
already connects.
Disabled - Not strictly part of STP, a network administrator can manually
disable a port
Edge Port:
They are attached to a LAN that has no other bridges attached. These edge ports
transition directly to the forwarding state. RSTP still continues to monitor the port
for BPDUs in case a bridge is connected. RSTP can also be configured to
automatically detect edge ports. As soon as the bridge detects a BPDU coming to
an edge port, the port becomes a non-edge port.
Forward Delay:
The range is from 4 to 30 seconds. This is the maximum time (in seconds) the root
device will wait before changing states (i.e., listening to learning to forwarding).
Transmission Limit:
This is used to configure the minimum interval between the transmissions of
consecutive RSTP BPDUs. This function can only be enabled in RSTP mode. The
range is from 1 to 10 seconds.
Hello Time:
Set the time at which the root switch transmits a configuration message. The
range is from 1 to 10 seconds.
Bridge priority:
Bridge priority is used in selecting the root device, root port, and designated port.
The device with the highest priority becomes the STA root device. However, if all
devices have the same priority, the device with the lowest MAC address will
become the root device.
Port Priority:
Set the port priority in the switch. Low numeric value indicates a high priority. A
port with lower priority is more likely to be blocked by STP if a network loop is
detected. The valid value is from 0 to 240.
Path Cost:
The valid value is from 1 to 200000000. Higher cost paths are more likely to be
blocked by STP if a network loop is detected.
BPDU Guard:
This is a per port setting. If the port is enabled in BPDU guard and receive any
BPDU, the port will be set to disable to avoid the error environments. User must
enable the port by manual.
BPDU Filter:
It is a feature to filter sending or receiving BPDUs on a switch port. If the port
receives any BPDUs, the BPDUs will be dropped.
Notice:
If both of the BPDU filter and BPDU guard are enabled, the BPDU filter has the
high priority.
Root Guard:
The Root Guard feature forces an interface to become a designated port to prevent
surrounding switches from becoming a root switch. In other words, Root Guard
provides a way to enforce the root bridge placement in the network. The Root Guard
feature prevents a Designated Port from becoming a Root Port. If a port on which
the Root Guard feature receives a superior BPDU, it moves the port into a
rootinconsistent state (effectively equal to a listening state), thus maintaining the
current Root Bridge status. The port can be moved to forwarding state if no superior
BPDU received by this port for three hello times.
Содержание TI-G160WS
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