Hirschmann RS20 Programming Manual

Rapid Spanning Tree
96
6.6 The Rapid Spanning Tree Protocol
Redundanz L2P
Release 5.0 04/09
X Alternate port
This is a blocked port that takes over the task of the bridge port if the
connection to the root bridge fails. The alternate port guarantees the
connection of the bridge to the root bridge.
X Backup port
This is a blocked port that serves as a backup in case the connection to
the designated port of this network segment (without RSTP bridge) fails.
X Disabled port
This is the port that does not play any role with the Spanning Tree
Operation, and is therefore switched off or does not have any connection.
Figure 50: Port role assignment
P-BID Priority of the bridge identifikation (BID)
= BID without MAC Address
Root path
Interrupted path
Root port
Designated port
Alternate port
Backup port
Edge port
Port 1
Port 2
Bridge 2
P-BID = 20 480
Bridge 3
P-BID = 24 576
Bridge 5
P-BID = 32 768
Bridge 1
P-BID = 16 384
Bridge 7
P-BID = 40 960
P-BID = 28 672
Bridge 4

Hirschmann RS20 Specifications

General

Mounting	DIN Rail
Operating Temperature	-40°C to +70°C
Protection Class	IP30
Switching Technology	Store-and-Forward
Product Type	Industrial Ethernet Switch
Port Details	10/100 Mbps Ethernet ports
Switching Capacity	3.2 Gbps
MAC Address Table	8k
Management	Web, SNMP
Redundancy	MRP
Ports	8 or 16