WAGO 852-1305 Manual page 90

90 Enhanced Features
"Forwarding"
•
The port is in normal operating mode and receives and sends data. STP still
monitors incoming BPDUs that would indicate that the port should return to
the "Blocking" state to prevent a loop.
"Disabled"
•
It is not strictly part of the STP because a network administrator can
manually disable a port.
RSTP Bridge Port Roles
• "Root"
The "Root Port" is a forwarding port that can best transmit data from the
"Non-Root Bridge" to the "Root Bridge".
• "Designated"
This is a forwarding port for every LAN segment.
• "Alternate"
This port represents an alternate path to the "Root Bridge". However, the
path is different than the "Root Port".
• "Backup"
This port is used as a backup/redundant path to a segment to which another
"Bridge Port" is already connected.
• "Disabled"
This is not actually part of STP because a network administrator can
manually disable a port.
STP/RSTP
In this document, "STP" refers to both STP and RSTP.
STP Terminology
Root Bridge
The "Root Bridge" is the "Base" of the spanning tree.
Path Cost
The path costs are the costs for transmitting a frame through the port in the LAN.
This value should be adjusted to the transmission speed.
The valid range is 1 to 200000000. A path with higher costs is more likely to be
blocked by SSTP if a network look is detected.
- "Path Cost Short" is the original size with a 16-bit value.
Only speeds up to 10 GBit can be considered.
- "Path Cost Long" stands for a 32-bit value.
Speeds up to 10 TBit are supported.
WAGO-ETHERNET-Zubehör 852
852-1305 8/4-Port 100BASE-T/1000BASE-SX/LX
Manual
1.1.0