Tripp Lite NGI-M05-C1 Owner's Manual page 155

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
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