Managed Industrial Ethernet Switch User Manual
3onedata proprietary and confidential 53
Copyright © 3onedata Co., Ltd.
Ring V2: supports single ring and coupling ring;
Ring V3: supports single ring, coupling ring, chain and
Dual_homing;
RSTP (IEEE 802.1W/1D): rapid spanning tree.
Bridge priority
The priority of bridge.
Note:
In STP/RSTP network, the device with smallest bridge ID would be
elected as root bridge. The bridge ID consists of bridge priority and
bridge MAC address.
Hello time
The transmission time interval of the BPDU data packet.
Note:
The protocol message that STP/RSTP adopts is BPDU (Bridge
Protocol Data Unit).
FWD delay
The forward delay time that the port of switch maintains in
transition state (listening and learning).
Note:
STP/RSTP adopts a mechanism of state transition. The
newly-selected root port and specified port have to go through
twice the Forward Delay time to enter the forwarding state.
MAX age
The lifetime of BPDU packets.
RSTP status
Button, used for checking the current status of rapid spanning
tree.
Port
Displays the port number of the device.
Cost
The path cost from network bridge to root bridge.
Note:
Path cost is a reference value for STP protocol to choose links. The
path cost from a port to the root bridge is cumulated by the path
cost it go through each port of each bridge.
Priority
The priority of ports in bridge. The smaller the value, the
higher the priority.
Note:
PID (Port ID) consists of two parts. The high 4 digits are port
priorities, the low 12 digits are port numbers. In the case of same
root path cost, it would not block the port with the smallest PID
value, but the one with greater PID value.
P2P
The directly connected switch port, options are:
Yes;
No;
Auto: adopt negotiation mechanism that could implement
quick conversion of port states.
Edge
The switch that is on the edge of network and connects to the
terminal devices.
