Specifications

Functions
110
4.4 Spanning Tree Algorithm
RS2-4R
Release 1.0 03/04
Fig. 37: Port role assignment
D Alternate port
The port that takes over the function of the root port if the connection
to the root bridge fails. The alternative port re-establishes a reliable
connection from the bridge to the root bridge.
D Backup port
A port that is available as a replacement in case the connection to the
designated port of this network segment (without RSTP bridge) fails.
The replacement port leads to the branches of the Spanning Tree.
D Disabled-Port,
Port that has no meaning within the Spanning Tree operation, so is
disabled or has no link.
Brücke 5
Brücke 4
Brücke 2
Brücke 3
Brücke 1
Brücke 7
BID Bridge identifier
Root path
Interrupted path
Root port
Designated port
Alternate port
Backup port
Edge port
BID =40 BID =50
BID =30BID =20
BID =10
BID =70
Port 1
Port 2