Belden Hirschmann Rail Switch Power Lite User manual

UM RedundConfig RSPL
Release 2.0 02/2013
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https://hirschmann-support.belden.eu.com
User Manual
Redundancy Configuration
Rail Switch Power Lite (RSPL)

The naming of copyrighted trademarks in this manual, even when not specially indicated, should
not be taken to mean that these names may be considered as free in the sense of the trademark
and tradename protection law and hence that they may be freely used by anyone.
© 2013 Hirschmann Automation and Control GmbH
Manuals and software are protected by copyright. All rights reserved. The copying, reproduction,
translation, conversion into any electronic medium or machine scannable form is not permitted,
either in whole or in part. An exception is the preparation of a backup copy of the software for
your own use. For devices with embedded software, the end-user license agreement on the
enclosed CD/DVD applies.
The performance features described here are binding only if they have been expressly agreed
when the contract was made. This document was produced by Hirschmann Automation and
Control GmbH according to the best of the company's knowledge. Hirschmann reserves the right
to change the contents of this document without prior notice. Hirschmann can give no guarantee
in respect of the correctness or accuracy of the information in this document.
Hirschmann can accept no responsibility for damages, resulting from the use of the network
components or the associated operating software. In addition, we refer to the conditions of use
specified in the license contract.
You can get the latest version of this manual on the Internet at the Hirschmann product site
(www.hirschmann.com).
Printed in Germany
Hirschmann Automation and Control GmbH
Stuttgarter Str. 45-51
72654 Neckartenzlingen
Germany
Tel.: [phone]
Rel. 2.0 - 02/2013 – 11.02.2013

Contents
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Contents
About this Manual 5
Key 7
1 Network Topology vs. Redundancy Protocols 9
1.1 Network topologies 10
1.1.1 Meshed topology 10
1.1.2 Ring topology 11
1.2 Redundancy Protocols 12
2 Media Redundancy Protocol (MRP) 13
2.1 Network Structure 14
2.2 Reconfiguration time 15
2.3 Advanced mode 16
2.4 Prerequisites for MRP 17
2.5 Example Configuration 18
3 Spanning Tree 29
3.1 Basics 31
3.1.1 The tasks of the STP 31
3.1.2 Bridge parameters 32
3.1.3 Bridge Identifier 32
3.1.4 Root Path Cost 33
3.1.5 Port Identifier 34
3.1.6 Max Age and Diameter 35
3.2 Rules for Creating the Tree Structure 37
3.2.1 Bridge information 37
3.2.2 Setting up the tree structure 38
3.3 Examples 40
3.3.1 Example of determining the root path 40
3.3.2 Example of manipulating the root path 42
3.3.3 Example of manipulating the tree structure 44
3.4 The Rapid Spanning Tree Protocol 45
3.4.1 Port roles 45
3.4.2 Port states 48

Contents
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3.4.3 Spanning Tree Priority Vector 49
3.4.4 Fast reconfiguration 49
3.4.5 STP compatibility mode 50
3.5 Configuring the device 51
3.6 Guards 57
3.6.1 Activating the BPDU Guard 61
3.6.2 Activating Root Guard / TCN Guard / Loop Guard 64
A Readers’ Comments 66
B Index 69
C Further Support 71

About this Manual
UM RedundConfig RSPL
Release 2.0 02/2013
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About this Manual
The “GUI” reference manual contains detailed information on using the
graphical interface to operate the individual functions of the device.
The “Command Line Interface” reference manual contains detailed
information on using the Command Line Interface to operate the individual
functions of the device.
The “Installation” user manual contains a device description, safety
instructions, a description of the display, and the other information that you
need to install the device.
The “Basic Configuration” user manual contains the information you need to
start operating the device. It takes you step by step from the first startup
operation through to the basic settings for operation in your environment.
The “Redundancy Configuration” user manual document contains the
information you require to select the suitable redundancy procedure and
configure it.
The “HiView” user manual contains information for using the HiView GUI
application. This application allows you to use the graphical user interface of
Hirschmann devices with management independently of other applications,
such as a browser.

About this Manual
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UM RedundConfig RSPL
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The Industrial HiVision Network Management Software provides you with
additional options for smooth configuration and monitoring:
Simultaneous configuration of multiple devices
Graphical user interface with network layout
Auto-topology discovery
Event log
Event handling
Client/server structure
Browser interface
ActiveX control for SCADA integration
SNMP/OPC gateway.

Key
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Key
The designations used in this manual have the following meanings:
Symbols used:
List
Work step

Subheading
Link Cross-reference with link
Note: A note emphasizes an important fact or draws your attention to a dependency.
Courier ASCII representation in user interface
Execution in the Graphical User Interface
Execution in the Command Line Interface
WLAN access point
Router with firewall
Switch with firewall
Router
Switch

Key
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Bridge
Hub
A random computer
Configuration Computer
Server
PLC -
Programmable logic
controller
I/O -
Robot

Network Topology vs. Redundancy
Protocols
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1 Network Topology vs.
Redundancy Protocols
When using Ethernet, an important prerequisite is that data packets follow a
single (unique) path from the sender to the receiver. The following network
topologies support this prerequisite:
Line topology
Star topology
Tree topology
Figure 1: Network with line, star and tree topologies
To ensure that the communication is maintained when a connection fails, you
install additional physical connections between the network nodes.
Redundancy protocols ensure that the additional connections remain
switched off while the original connection is still working. If the connection
fails, the redundancy protocol generates a new path from the sender to the
receiver via the alternative connection.
To introduce redundancy onto layer 2 of a network, you first define which
network topology you require. Depending on the network topology selected,
you then choose from the redundancy protocols that can be used with this
network topology.

Network Topology vs. Redundancy
Protocols
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1.1 Network topologies
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1.1 Network topologies
1.1.1 Meshed topology
For networks with star or tree topologies, redundancy procedures are only
possible in connection with physical loop creation. The result is a meshed
topology.
Figure 2: Meshed topology: Tree topology with physical loops
For operating in this network topology, the device provides you with the
following redundancy protocols:
Rapid Spanning Tree (RSTP)

Network Topology vs. Redundancy
Protocols
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1.1 Network topologies
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1.1.2 Ring topology
In networks with a line topology, you can use redundancy procedures by
connecting the ends of the line. This creates a ring topology.
Figure 3: Ring topology: Line topology with connected ends
For operating in this network topology, the device provides you with the
following redundancy protocols:
Media Redundancy Protocol (MRP)
Rapid Spanning Tree (RSTP)

Network Topology vs. Redundancy
Protocols
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1.2 Redundancy Protocols
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1.2 Redundancy Protocols
For operating in different network topologies, the device provides you with
the following redundancy protocols:
Note: When you are using a redundancy function, you deactivate the flow
control on the participating ports. Default setting: flow control deactivated
globally and activated on every port.
If the flow control and the redundancy function are active at the same time,
the redundancy may not work as intended.
Redundancy
protocol
Network topology Comments
MRP Ring The switching time can be selected and is practically
independent of the number of devices.
An MRP-Ring consits of up to 50 devices that support
the MRP protocol according to IEC 62439.
If you only use Hirschmann devices, up to 100 devices
are possible in the MRP-Ring.
RSTP Random structure The switching time depends on the network topology
and the number of devices.
typ. < 1 s with RSTP
typ. < 30 s with STP
Table 1: Overview of redundancy protocols

Media Redundancy Protocol (MRP)
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2 Media Redundancy Protocol
(MRP)
Since May 2008, the Media Redundancy Protocol (MRP) has been a
standardized solution for ring redundancy in the industrial environment.
MRP is compatible with redundant ring coupling, supports VLANs, and is
distinguished by very short reconfiguration times.
An MRP-Ring consists of up to 50 devices that support the MRP protocol
according to IEC 62439. If you only use Hirschmann devices, up to 100
devices are possible in the MRP-Ring.

Media Redundancy Protocol (MRP)
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2.1 Network Structure
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2.1 Network Structure
The concept of ring redundancy allows the construction of high-availability,
ring-shaped network structures.
With the help of the RM (Ring Manager) function, the two ends of a backbone
in a line structure can be closed to a redundant ring. The ring manager keeps
the redundant line open as long as the line structure is intact. If a segment
becomes inoperable, the ring manager immediately closes the redundant
line, and line structure is intact again.
Figure 4: Line structure
Figure 5: Redundant ring structure
RM = Ring Manager
—— main line
- - - redundant line
RM

Media Redundancy Protocol (MRP)
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2.2 Reconfiguration time
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2.2 Reconfiguration time
If a line section fails, the ring manager changes the MRP-Ring back into a
line structure. You define the maximum time for the reconfiguration of the line
in the ring manager.
Possible values for the maximum delay time:
•500ms
•200ms
Note: You only configure the reconfiguration time with a value less than 500
ms if all the devices in the ring support the shorter delay time.
Otherwise the devices that only support longer delay times might not be
reachable due to overloading. Loops can occur as a result.

Media Redundancy Protocol (MRP)
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2.3 Advanced mode
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2.3 Advanced mode
For times even shorter than the guaranteed reconfiguration times, the device
provides the advanced mode. The advanced mode speeds up the link failure
recognition when the ring participants inform the ring manager of
interruptions in the ring via link-down notifications.
Hirschmann devices support link-down notifications. Therefore, you
generally activate the advanced mode in the ring manager.
If you are using devices that do not support link-down notifications, the ring
manager reconfigures the line in the selected maximum reconfiguration time.

Media Redundancy Protocol (MRP)
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2.4 Prerequisites for MRP
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2.4 Prerequisites for MRP
Before setting up an MRP-Ring, make sure that the following conditions are
fulfilled:
All ring participants support MRP.
The ring participants are connected to each other via the ring ports. Apart
from the device’s neighbors, no other ring participants are connected to
the respective device.
All ring participants support the configuration time defined in the ring
manager.
There is exactly 1 ring manager in the ring.
If you are using VLANs, configure every ring port with the following settings:
Deactivate ingress filtering - see the
Switching:VLAN:Port dialog.
Define the port VLAN ID (PVID) - see the
Switching:VLAN:Port dialog.
– PVID = 1if the device transmits the MRP data packets untagged
(VLAN ID = 0in
Redundancy:MRP dialog)
– PVID = any if the device transmits the MRP data packets in a VLAN
(VLAN ID ≥1in
Redundancy:MRP dialog)
Define egress rules - see
Switching:VLAN:Static dialog.
–U(untagged) if the device transmits the MRP data packets untagged
(VLAN ID = 0in
Redundancy:MRP dialog)
–T(tagged) if the device transmits the MRP data packets in a VLAN
(VLAN ID ≥1in
Redundancy:MRP dialog)

Media Redundancy Protocol (MRP)
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2.5 Example Configuration
UM RedundConfig RSPL
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2.5 Example Configuration
A backbone network contains 3 devices in a line structure. To increase the
availability of the network, you convert the line structure to a redundant ring
structure. Devices from different manufacturers are used.All devices support
MRP. On every device you define ports 1.1 and 1.2 as ring ports.
Figure 6: Example of MRP-Ring
RM = Ring Manager
—— main line
- - - redundant line
The following example configuration describes the configuration of the ring
manager device (1). You configure the 2 other devices (2 to 3) in the same
way, but without activating the ring manager function. This example does not
use a VLAN. You have entered 200 ms as the ring recovery time, and all the
devices support the advanced mode of the ring manager.
Set up the network to meet your demands.
Configure all ports so that the transmission speed and the duplex settings
of the lines correspond to the following table:
RM
12 3
1.1 1.2 1.1 1.2 1.1 1.2

Media Redundancy Protocol (MRP)
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2.5 Example Configuration
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Note: You configure optical ports without support for autonegotiation
(automatic configuration) with 100 Mbit/s full duplex (FDX) or 1000 Mbit/s full
duplex (FDX).
Port type Bit rate Autonegotiation
(automatic
configuration)
Port setting Duplex
TX 100 Mbit/s off on 100 Mbit/s full duplex (FDX)
TX 1 Gbit/s on on -
Optical 100 Mbit/s off on 100 Mbit/s full duplex (FDX)
Optical 1 Gbit/s on on -
Table 2: Port settings for ring ports

Media Redundancy Protocol (MRP)
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2.5 Example Configuration
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Note: Configure all the devices of the MRP-Ring individually. Before you
connect the redundant line, you must have completed the configuration of all
the devices of the MRP-Ring. You thus avoid loops during the configuration
phase.
You deactivate the flow control on the participating ports.
If the flow control and the redundancy function are active at the same
time, there is a risk that the redundancy function will not operate as
intended. (Default setting: flow control deactivated globally and activated
on all ports.)
Switch Spanning Tree off on all devices in the network:
Open the Redundancy:Spanning Tree:Global dialog.
Switch off the function.
In the state on delivery, Spanning Tree is switched on on the device.
Figure 7: Switching the function off
enable Switch to the privileged EXEC mode.
configure Switch to the Configuration mode.
no spanning-tree operation Switches Spanning Tree off.
show spanning-tree global Displays the parameters for checking.