Hirschmann RS20 series User manual

Redundancy
Release 6.0 07/2010
Technical Support
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User Manual
Redundancy Configuration
Industrial ETHERNET Switch
RS20, RSB20

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Tel.: [phone]
Rel. 6.01-01 07/2010 – 14.7.10

Contents
About this Manual 5
Key 6
1 Introduction 9
1.1 Overview of Redundancy Topologies 10
1.2 Overview of Redundancy Protocols 11
2 Ring Redundancy 13
2.1 Example of a HIPER-Ring 15
2.1.1 Setting up and configuring the HIPER-Ring 17
2.2 Example of an MRP-Ring 21
3 Multiple Rings 27
3.1 Sub-Ring 28
3.1.1 Example configuration 31
4 Spanning Tree 39
4.1 The Spanning Tree Protocol 41
4.1.1 The tasks of the STP 41
4.1.2 Bridge parameters 42
4.1.3 Bridge Identifier 42
4.1.4 Root Path Cost 43
4.1.5 Port Identifier 45
4.2 Rules for Creating the Tree Structure 46
4.2.1 Bridge information 46
4.2.2 Setting up the tree structure 46
4.3 Example of Root Path Determination 48
4.4 Example of Root Path Manipulation 50
4.5 Example of Tree Structure Manipulation 52
4.6 The Rapid Spanning Tree Protocol 53
4.6.1 Port roles 53
4.6.2 Port states 55
4.6.3 Spanning Tree Priority Vector 56
4.6.4 Fast reconfiguration 57

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4.6.5 Configuring the Rapid Spanning Tree 58
4.7 Combining RSTP and MRP 68
4.7.1 Application example for the combination of RSTP and
MRP 70
A Readers’ Comments 73
B Index 75
C Further Support 77

About this Manual
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About this Manual
The “Redundancy Configuration” user manual contains the information you
need to select a suitable redundancy procedure and configure that
procedure.
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 “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 "Web-based Interface" reference manual contains detailed information
on using the Web 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 Network Management Software HiVision/Industrial HiVision provides
you with additional options for smooth configuration and monitoring:
XConfiguration of multiple devices simultaneously.
XGraphical interface with network layouts.
XAuto-topology discovery.
XEvent log.
XEvent handling.
XClient / Server structure.
XBrowser interface
XActiveX control for SCADA integration
XSNMP/OPC gateway

Key
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Key
The designations used in this manual have the following meanings:
Symbols used:
XList
Work step
Subheading
Link Indicates a cross-reference with a stored link
Note: A note emphasizes an important fact or draws your
attention to a dependency.
Courier ASCII representation in user interface
Execution in the Web-based Interface user interface
Execution in the Command Line Interface user 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

Key
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Introduction
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1 Introduction
The device contains a range of redundancy functions:
XHIPER-Ring
XMRP-Ring

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1.1 Overview of Redundancy Topolo-
gies
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1.1 Overview of Redundancy
Topologies
To introduce redundancy onto layer 2 of a network, first clarify 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.
The following topologies are possible:
Network topology Possible redundancy
procedures
Comments
Tree structure
without loops
(cycle-free)
Only possible in
combination with
physical loop creation
-
Topology with 1
loop
Ring Redundancy -
Table 1: Overview of Redundancy Topologies

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1.2 Overview of
Redundancy Protocols
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1.2 Overview of
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 all ports.
If the flow control and the redundancy function are active at the same time,
there is a risk of the redundancy failing.
Redundancy
procedure
Network topology Switch-over time
RSTP Random structure typically < 1 s (STP < 30 s), up to < 30 s - depends
heavily on the number of devices
Note: Up to 79 devices possible, depending on topology and configuration. If
the default values (factory settings) are used, up to 39 devices are possible,
depending on the topology (see page 39).
HIPER-Ring Ring typically 80 ms, up to < 500 ms or < 300 ms (selectable)
- the number of switches has a minimal effect on the
switch-over time
MRP-Ring ring typically 80 ms, up to < 500 ms or < 200 ms (selectable)
- the number of switches has a minimal effect on the
switch over time
Note: In combination with RSTP in MRP compatibility mode, up to 39 devices
are possible, depending on the configuration. If the default values (factory
settings) for RSTP are used, up to 19 devices are possible (see page 39).
Table 2: Comparison of the redundancy procedures

Introduction
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1.2 Overview of
Redundancy Protocols
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Ring Redundancy
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1.2 Overview of
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2 Ring Redundancy
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 1: Line structure
Figure 2: Redundant ring structure
RM = Ring Manager
—— main line
- - - redundant line
RM

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1.2 Overview of
Redundancy Protocols
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If a section is down, the ring structure of a
XHIPER-(HIGH PERFORMANCE REDUNDANCY) Ring with up to 50
devices typically transforms back to a line structure within 80 ms (possible
settings: standard/accelerated).
XMRP (Media Redundancy Protocol) Ring (IEC 62439) of up to 50 devices
typically transforms back to a line structure within 80 ms (adjustable to
max. 200 ms/500 ms).
Devices with HIPER-Ring function capability:
XWithin a HIPER-Ring, you can use any combination of the following
devices:
–RS1
– RS2-./.
– RS2-16M
–RS2-4R
– RS20, RS30, RS40
– RSR20, RSR30
– OCTOPUS
–MICE
–MS20,MS30
–PowerMICE
– MACH 100
– MACH 1000
– MACH 1040
– MACH 3000
– MACH 4000
XWithin an MRP-Ring, you can use devices that support the MRP protocol
based on IEC62439.
Note: Enabled Ring Redundancy methods on a device are mutually
exclusive at any one time. When changing to another Ring Redundancy
method, deactivate the function for the time being.
Note: The following usage of the term “ring manager” instead of “redundancy
manager” makes the function easier to understand.

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2.1 Example of a HIPER-Ring
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2.1 Example of a HIPER-Ring
A network contains a backbone in a line structure with 3 devices. To increase
the redundancy reliability of the backbone, you have decided to convert the
line structure to a HIPER-Ring. You use ports 1.1 and 1.2 of the devices to
connect the lines1.
Figure 3: Example of HIPER-Ring
RM = Ring Manager
—— main line
- - - redundant line
The following example configuration describes the configuration of the ring
manager device (1). The two other devices (2 to 3) are configured in the
same way, but without activating the ring manager function. Select the
“Standard” value for the ring recovery, or leave the field empty.
1. On modular devices the 1st number of the port designation specifies the
module. The 2nd number specifies the port on the module. The specification
pattern 1.x is also used on non-modular devices to ensure consistent
operation for modular and non-modular devices.
RM
12 3
1.1 1.2 1.1 1.2 1.1 1.2

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2.1 Example of a HIPER-Ring
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Note: Configure all the devices of the HIPER-Ring individually. Before you
connect the redundant line, you must complete the configuration of all the
devices of the HIPER-Ring. You thus avoid loops during the configuration
phase.

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2.1 Example of a HIPER-Ring
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2.1.1 Setting up and configuring the HIPER-Ring
Set up the network to meet your demands.
You configure all 6 ports so that the transmission speed and the duplex
settings of the lines correspond to the following table:
Note: When activating the HIPER-Ring function, the device sets the
corresponding settings for the pre-defined ring ports in the configuration table
(transmission rate and mode). If the HIPER-Ring function is switched off, the
ports, which are changed back into normal ports, keep the ring port settings.
Independently of the DIP switch setting, you can still change the port settings
via the software.
Bit rate 100 Mbit/s 1000 Mbit/s
Autonegotiation
(automatic configuration)
off on
Port on on
Duplex Full –
Table 3: Port settings for ring ports
Select the Redundancy:Ring Redundancy dialog.
Under “Version”, select HIPER-Ring.
Define the desired ring ports 1 and 2 by making the corresponding
entries in the module and port fields. If it is not possible to enter a
module, then there is only one module in the device that is taken
over as a default.

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2.1 Example of a HIPER-Ring
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Display in “Operation” field:
–active: This port is switched on and has a link.
–inactive: This port is switched off or it has no link.
Figure 4: Ring Redundancy dialog
Activate the ring manager for this device. Do not activate the ring
manager for any other device in the HIPER-Ring.
In the “Ring Recovery” frame, select the value “Standard” (default).
Note: Settings in the “Ring Recovery” frame only take effect for devices
configured as ring managers.
Click “Set” to temporarily save the entry in the configuration.

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2.1 Example of a HIPER-Ring
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Now proceed in the same way for the other two devices.
Note: If you have configured VLANs, note the VLAN configuration of the ring
ports.
In the configuration of the HIPER-Ring, you select for the ring ports
– VLAN ID 1 and
– VLAN membership Untagged in the static VLAN table
Note: Deactivate the Spanning Tree protocol for the ports connected to the
HIPER-Ring, because Spanning Tree and Ring Redundancy affect each
other.
If you used the DIP switch to activate the function of HIPER-Ring, RSTP is
automatically switched off.
Now you connect the line to the ring. To do this, you connect the 2 devices
to the ends of the line using their ring ports.
enable Switch to the Privileged EXEC mode.
configure Switch to the Configuration mode.
hiper-ring mode ring-manager Select the HIPER-Ring ring redundancy and
define the device as ring manager.
Switch's HIPER Ring mode set to ring-manager
hiper-ring port primary 1/1 Define port 1 in module 1 as ring port 1.
HIPER Ring primary port set to 1/1
hiper-ring port secondary 1/2 Define port 1 in module 2 as ring port 1.
HIPER Ring secondary port set to 1/2
exit Switch to the privileged EXEC mode.
show hiper-ring Display the HIPER-Ring parameters.
HIPER Ring Mode of the Switch.................. ring-manager
configuration determined by.................. management
HIPER Ring Primary Port of the Switch.......... 1/1, state active
HIPER Ring Secondary Port of the Switch........ 1/2, state active
HIPER Ring Redundancy Manager State............ active
HIPER Ring Redundancy State (red. exists).. no (rm is active)
HIPER Ring Setup Info (Config. failure)........ no error
HIPER Ring Recovery Delay...................... 500ms

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2.1 Example of a HIPER-Ring
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Note: If you want to use link aggregation connections in the HIPER-Ring
(PowerMICE and MACH 4000), you enter the index of the desired link
aggregation entry for the module and the port.
The displays in the “Information” frame mean
– “Redundancy existing”: One of the lines affected by the function may
be interrupted, with the redundant line then taking over the function
of the interrupted line.
– "Configuration failure”: The function is incorrectly configured or the
cable connections at the ring ports are improperly configured (e.g.,
not plugged into the ring ports).