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140
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 root-inconsistent 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.
Default Settings
STP/RSTP
: disabled.
STP/RSTP mode
: RSTP.
Forward Time
: 15 seconds.
Hello Time
: 2 seconds.
Maximum Age
: 20 seconds.
System Priority
: 32768.
Transmission Limit
: 3 seconds.
Per port STP state
: enabled.
Per port Priority
: 128.
Per port Edge port
: disabled.
Per port BPDU filter
: disabled.
Per port BPDU guard
: disabled.
Per port BPDU Root guard: disabled.
Per port Path Cost
: depend on port link speed.
Example: Bandwidth -> STP Port Cost Value
10 Mbps -> 100
100 Mbps-> 19
1 Gbps -> 4
10 Gbps -> 2