Hirschmann RS20 User Manual
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Hirschmann RS20 User Manual

Redundancy configuration industrial ethernet (gigabit) switch
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See also: Programming Manual , User Manual
User Manual
Redundancy Configuration
Industrial Ethernet (Gigabit) Switch
RS20/RS30/RS40, MS20/MS30, OCTOPUS
UM Redundancy Configuration L2E
Technical Support
Release 7.1 12/2011
HAC.Support@Belden.com

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  • Page 1 User Manual Redundancy Configuration Industrial Ethernet (Gigabit) Switch RS20/RS30/RS40, MS20/MS30, OCTOPUS UM Redundancy Configuration L2E Technical Support Release 7.1 12/2011 HAC.Support@Belden.com...
  • Page 2 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.beldensolutions.com). Printed in Germany Hirschmann Automation and Control GmbH Stuttgarter Str.

  • Page 3: Table Of Contents

    Contents Contents About this Manual Introduction Overview of Redundancy Topologies Overview of Redundancy Protocols Ring Redundancy Example of a HIPER-Ring 2.1.1 Setting up and configuring the HIPER-Ring Example of a MRP-Ring Multiple Rings Ring/Network Coupling Variants of the ring/network coupling Preparing a Ring/Network Coupling 4.2.1 Stand-by switch 4.2.2 One-Switch coupling...
  • Page 4 Contents Example of manipulating the tree structure The Rapid Spanning Tree Protocol 5.6.1 Port roles 5.6.2 Port states 5.6.3 Spanning Tree Priority Vector 5.6.4 Fast reconfiguration 5.6.5 Configuring the Rapid Spanning Tree Combining RSTP and MRP 5.7.1 Application example for the combination of RSTP and Readers’...

  • Page 5: About This Manual

    About this Manual About this Manual The “Redundancy Configuration User Manual” document contains the information you require to select the suitable redundancy procedure and configure it. 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.
  • Page 6 SNMP/OPC gateway. Maintenance  Hirschmann are continually working on improving and developing their software. You should regularly check whether there is a new version of the software that provides you with additional benefits. You will find software information and downloads on the product pages of the Hirschmann website.

  • Page 7: Key

    The designations used in this manual have the following meanings:  List Work step  Subheading  Link Cross-reference with link Note: A note emphasizes an important fact or draws your attention to a dependency. ASCII representation in user interface Courier Execution in the Graphical User Interface (Web-based Interface user interface) Execution in the Command Line Interface user interface...
  • Page 8 Bridge A random computer Configuration Computer Server PLC - Programmable logic controller I/O - Robot UM Redundancy Configuration L2E Release 7.1 12/2011...

  • Page 9: Introduction

    Introduction 1 Introduction The device contains a range of redundancy functions:  HIPER-Ring  MRP-Ring  Ring/Network coupling  Rapid Spanning Tree Algorithm (RSTP) UM Redundancy Configuration L2E Release 7.1 12/2011...

  • Page 10: Overview Of Redundancy Topologies

    Ring Redundancy when redundantly coupling a redundant ring to Ring coupling another redundant ring, or to any structure that only works with Hirschmann devices Table 1: Overview of Redundancy Topologies The Ring Redundancy Protocol MRP has particular properties to offer: ...

  • Page 11: Overview Of Redundancy Protocols

    Introduction 1.2 Overview of Redundancy Protocols 1.2 Overview of Redundancy Protocols Redundancy Network topology Switch-over time procedure 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.
  • Page 12 Introduction 1.2 Overview of Redundancy Protocols UM Redundancy Configuration L2E Release 7.1 12/2011...

  • Page 13: Ring Redundancy

    Ring Redundancy 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.
  • Page 14  Within 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 –...

  • Page 15: Example Of A Hiper-Ring

    Ring Redundancy 2.1 Example of a HIPER-Ring 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 lines Figure 3: Example of HIPER-Ring RM = Ring Manager...
  • Page 16 Note: As an alternative to using software to configure the HIPER-Ring, with devices RS20/30/40 and MS20/30 you can also use DIP switches to enter a number of settings on the devices. You can also use a DIP switch to enter a setting for whether the configuration via DIP switch or the configuration via software has priority.

  • Page 17: Setting Up And Configuring The Hiper-Ring

    Ring Redundancy 2.1 Example of a HIPER-Ring 2.1.1 Setting up and configuring the HIPER-Ring  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: Port type Bit rate Autonegotiation Port setting...
  • Page 18 Ring Redundancy 2.1 Example of a HIPER-Ring 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.
  • Page 19 Ring Redundancy 2.1 Example of a HIPER-Ring Switch to the privileged EXEC mode. enable Switch to the Configuration mode. configure 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 Define port 1 in module 1 as ring port 1.
  • Page 20 Ring Redundancy 2.1 Example of a HIPER-Ring 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.

  • Page 21: Example Of A Mrp-Ring

    Ring Redundancy 2.2 Example of a MRP-Ring 2.2 Example of a MRP-Ring A network contains a backbone in a line structure with 3 devices. To increase the availability of the backbone, you decide to convert the line structure to a redundant ring.
  • Page 22 Ring Redundancy 2.2 Example of a MRP-Ring Note: For devices with DIP switches, put all DIP switches to “On”. The effect of this is that you can use the software configuration to configure the redundancy function without any restrictions. You thus avoid the possibility of the software configuration being hindered by the DIP switches.
  • Page 23 Ring Redundancy 2.2 Example of a MRP-Ring Display in “Operation” field:  forwarding: this port is switched on and has a link.  blocked: this port is blocked and has a link  disabled: this port is disabled  not-connected: this port has no link Figure 6: Ring Redundancy dialog ...
  • Page 24 Ring Redundancy 2.2 Example of a MRP-Ring 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. –...
  • Page 25 Ring Redundancy 2.2 Example of a MRP-Ring Switch to the privileged EXEC mode. enable Switch to the Configuration mode. configure Creates a new MRP-Ring with the default domain mrp new-domain default-domain 255.255.255.255.255.255.255.255.255.255.255. 255.255.255.255.255. MRP domain created: Domain ID: 255.255.255.255.255.255.255.255.255.255.255.255.255.255.255.255 (Default MRP domain) Define port 1 in module 1 as ring port 1 (primary).
  • Page 26 Ring Redundancy 2.2 Example of a MRP-Ring Define this device as the ring manager. mrp current-domain mode manager Mode of Switch set to manager Define 200ms as the value for the “Ring mrp current-domain recovery- Recovery”. delay 200ms Recovery delay set to 200ms Activate the “MRP Advanced Mode”.

  • Page 27: Multiple Rings

    Multiple Rings 3 Multiple Rings The device allows you to set up multiple rings with different redundancy protocols:  You have the option of coupling to MRP-Rings other ring structures that work with RSTP (see on page 87 “Combining RSTP and MRP”).
  • Page 28 Multiple Rings UM Redundancy Configuration L2E Release 7.1 12/2011...

  • Page 29: Ring/Network Coupling

    HIPER-Ring or MRP) to a second ring (also HIPER-Ring, Fast HIPER-Ring or MRP) or to a network segment of any structure, when all the devices in the coupled network are Hirschmann devices. The ring/network coupling supports the following devices: ...

  • Page 30: Variants Of The Ring/Network Coupling

    Ring/Network Coupling 4.1 Variants of the ring/network coupling 4.1 Variants of the ring/network coupling The redundant coupling is effected by the one-Switch coupling of two ports of one device in the first ring/network segment to one port each of two devices in the second ring/network segment (see fig.
  • Page 31 Ring/Network Coupling 4.1 Variants of the ring/network coupling One-Switch coupling Two-Switch coupling Two-Switch coupling with control line Application The 2 devices are in The 2 devices are in The 2 devices are in impractical topological practical topological practical topological positions. positions.

  • Page 32: Preparing A Ring/Network Coupling

    You will find details on the DIP switches in the “Installation” user manual. Device type Stand-by switch type RS2-./. DIP switch RS2-16M DIP switch RS20/RS30/RS40 Selectable: DIP switch and software setting MICE/Power MICE Selectable: DIP switch and software setting MS20/MS30 Selectable: DIP switch and software setting OCTOPUS Software switch...
  • Page 33 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Device with Choice of main coupling or redundant coupling DIP switch On “Stand-by” DIP switch DIP switch/software switch According to the option selected option - on “Stand-by” DIP switch or in the - Redundancy:Ring/Network Coupling dialog, by making selection in “Select configuration”.
  • Page 34 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Figure 7: Choosing the ring coupling configuration (when the DIP switch is off, or for devices without a DIP switch) For devices without DIP switches, the software settings are not restricted. For devices with DIP switches, depending on the DIP switch position, the dialog displays the possible configurations in color, while those configurations that are not possible appear in gray.

  • Page 35: One-Switch Coupling

    Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling 4.2.2 One-Switch coupling STAND-BY Figure 8: Example of one-Switch coupling 1: Backbone 2: Ring 3: Partner coupling port 4: Coupling port 5: Main Line 6: Redundant Line UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 36 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling The coupling between two networks is performed by the main line (solid blue line) in the normal mode of operation, which is connected to the partner coupling port. If the main line becomes inoperable, the redundant line (dashed blue line), which is connected to the coupling port, takes over the ring/network coupling.
  • Page 37 RS2-./. Not possible Not possible RS2-16M All ports (default setting: port 2) All ports (default setting: port 1) RS20, RS30, All ports (default setting: port 1.3) All ports (default setting: port 1.4) RS40 OCTOPUS All ports (default setting: port 1.3) All ports (default setting: port 1.4)
  • Page 38 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling The displays in the “Information” frame mean: – “Redundancy guaranteed”: If the main line no longer functions, the redundant line takes over the function of the main line. – “Configuration failure”: The function is incomplete or incorrectly configured.
  • Page 39 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Figure 11: One-Switch coupling: Selecting the redundancy mode With the “Redundant Ring/Network Coupling” setting, either the main line or the redundant line is active. The lines are never both active at the same time. With the “Extended Redundancy”...
  • Page 40 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Figure 13: One-Switch coupling: Selecting the coupling mode  Select "Ring coupling" if you are connecting to a redundancy ring.  Select "Network Coupling" if you are connecting to a line or tree structure.

  • Page 41: Two-Switch Coupling

    Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling 4.2.3 Two-Switch coupling STAND-BY STAND-BY Figure 14: Example of two-Switch coupling 1: Backbone 2: Ring 3: Main line 4: Redundant line UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 42 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling The coupling between 2 networks is performed by the main line (solid blue line). If the main line or one of the adjacent Switches becomes inoperable, the redundant line (dashed black line) takes over coupling the 2 networks. The coupling is performed by two Switches.
  • Page 43 Coupling port RS2-./. Not possible RS2-16M Adjustable for all ports (default setting: port 1) RS20, RS30, RS40 Adjustable for all ports (default setting: port 1.4) OCTOPUS Adjustable for all ports (default setting: port 1.4) MICE Adjustable for all ports (default setting: port 1.4) PowerMICE Adjustable for all ports (default setting: port 1.4)
  • Page 44 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Figure 16: Two-Switch coupling: Selecting the port and enabling/disabling operation To avoid continuous loops, the Switch sets the port state of the coupling port to “off” if you: – switch off the operation setting or –...
  • Page 45 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling  Select "Two-Switch coupling“ by means of the dialog button with the same graphic as below (see fig. 17). STAND-BY Figure 17: Two-Switch coupling 1: Coupling port 2: Partner coupling port The following settings apply to the switch displayed in blue in the selected graphic.
  • Page 46 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling  Activate the function in the “Operation” frame (see fig. 16) The displays in the “Select port” frame mean: – “Port mode”: The port is either active or in stand-by mode. – “Port state”: The port is either connected or not connected. –...
  • Page 47 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Redundancy mode  In the “Redundancy Mode” frame, select (see fig. 18) – “Redundant Ring/Network Coupling” or – “Extended Redundancy”. Figure 18: Two-Switch coupling: Selecting the redundancy mode With the “Redundant Ring/Network Coupling” setting, either the main line or the redundant line is active.
  • Page 48 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Coupling mode The coupling mode indicates the type of the connected network.  In the “Coupling Mode” frame, select (see fig. 20) – “Ring Coupling” or – “Network Coupling” Figure 20: Two-Switch coupling: Selecting the coupling mode ...

  • Page 49: Two-Switch Coupling With Control Line

    Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling 4.2.4 Two-Switch Coupling with Control Line STAND-BY STAND-BY Figure 21: Example of Two-Switch coupling with control line 1: Backbone 2: Ring 3: Main line 4: Redundant line 5: Control line UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 50 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling The coupling between 2 networks is performed by the main line (solid blue line). If the main line or one of the adjacent Switches becomes inoperable, the redundant line (dashed black line) takes over coupling the 2 networks. The coupling is performed by two Switches.
  • Page 51 RS2-../.. ) RS2-16M Adjustable for all ports Adjustable for all ports (default setting: port 1) (default setting: port 2) RS20, RS30, Adjustable for all ports Adjustable for all ports RS40 (default setting: port 1.4) (default setting: port 1.3) OCTOPUS...
  • Page 52 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling  Activate the function in the “Operation” frame (see fig. 23)  Now connect the redundant line and the control line. The displays in the “Select port” frame mean: – “Port mode”: The port is either active or in stand-by mode. –...
  • Page 53 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Note: The following settings are required for the coupling ports (you select the Basic Settings:Port Configuration dialog): See table on 17 “Port settings for ring ports”. Note: If VLANs are configured, set the coupling and partner coupling ports’...
  • Page 54 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Note: Configure the coupling port and the redundancy ring ports on different ports.  Activate the function in the “Operation” frame (see fig. 23)  Now connect the redundant line and the control line. The displays in the “Select port”...
  • Page 55 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Redundancy mode  In the “Redundancy Mode” frame, select: – “Redundant Ring/Network Coupling” – “Extended Redundancy”. Figure 25: Two-Switch coupling with control line: Selecting the redundancy mode With the “Redundant Ring/Network Coupling” setting, either the main line or the redundant line is active.
  • Page 56 Ring/Network Coupling 4.2 Preparing a Ring/Network Coupling Figure 26: Extended redundancy Coupling mode The coupling mode indicates the type of the connected network.  In the “Coupling Mode” frame, select: – “Ring coupling” – “Network Coupling” Figure 27: Two-Switch coupling with control line: Selecting the coupling mode ...

  • Page 57: Spanning Tree

    Spanning Tree 5 Spanning Tree Note: The Spanning Tree Protocol is a protocol for MAC bridges. For this reason, the following description uses the term bridge for switch. Local networks are getting bigger and bigger. This applies to both the geographical expansion and the number of network participants.
  • Page 58 Spanning Tree If the device working as the root is inoperable and another device takes over its function, the Max Age setting of the new root bridge determines the maximum number of devices allowed in a branch. Note: The RSTP standard dictates that all the devices within a network work with the (Rapid) Spanning Tree Algorithm.

  • Page 59: The Spanning Tree Protocol

    Spanning Tree 5.1 The Spanning Tree Protocol 5.1 The Spanning Tree Protocol Because RSTP is a further development of the STP, all the following descriptions of the STP also apply to the RSTP. 5.1.1 The tasks of the STP The Spanning Tree Algorithm reduces network topologies built with bridges and containing ring structures due to redundant links to a tree structure.

  • Page 60: Bridge Parameters

    Spanning Tree 5.1 The Spanning Tree Protocol 5.1.2 Bridge parameters In the context of Spanning Treee, each bridge and its connections are uniquely described by the following parameters:  Bridge Identifier  Root Path Cost for the bridge ports,  Port Identifier 5.1.3 Bridge Identifier...

  • Page 61: Root Path Cost

    Spanning Tree 5.1 The Spanning Tree Protocol 5.1.4 Root Path Cost Each path that connects 2 bridges is assigned a cost for the transmission (path cost). The switch determines this value based on the transmission speed (see table 11). It assigns a higher path cost to paths with lower transmission speeds.
  • Page 62 Spanning Tree 5.1 The Spanning Tree Protocol Data rate Recommended value Recommended range Possible range ≤100 Kbit/s 200,000,000 20,000,000-200,000,000 1-200,000,000 1 Mbit/s 20,000,000 2,000,000-200,000,000 1-200,000,000 10 Mbit/s 2,000,000 200,000-20,000,000 1-200,000,000 100 Mbit/s 200,000 20,000-2,000,000 1-200,000,000 1 Gbit/s 20,000 2,000-200,000 1-200,000,000 10 Gbit/s 2,000 200-20,000...

  • Page 63: Port Identifier

    Spanning Tree 5.1 The Spanning Tree Protocol 5.1.5 Port Identifier The port identifier consists of 2 bytes. One part, the lower-value byte, contains the physical port number. This provides a unique identifier for the port of this bridge. The second, higher-value part is the port priority, which is specified by the Administrator (default value: 128).

  • Page 64: Rules For Creating The Tree Structure

    Spanning Tree 5.2 Rules for Creating the Tree Structure 5.2 Rules for Creating the Tree Structure 5.2.1 Bridge information To determine the tree structure, the bridges need more detailed information about the other bridges located in the network. To obtain this information, each bridge sends a BPDU (Bridge Protocol Data Unit) to the other bridges.
  • Page 65 Spanning Tree 5.2 Rules for Creating the Tree Structure  If there are multiple paths with the same root path costs, the bridge further away from the root decides which port it blocks. For this purpose, it uses the bridge identifiers of the bridge closer to the root. The bridge blocks the port that leads to the bridge with the numerically higher ID (a numerically higher ID is the logically worse one).
  • Page 66 Spanning Tree 5.2 Rules for Creating the Tree Structure Determine root path Equal Path with lowest path costs? path costs = root path Equal Path with highest priority in priority in bridge bridge identification? identification = root path Path with highest Equal port priority port priority?

  • Page 67: Example Of Determining The Root Path

    Spanning Tree 5.3 Example of determining the root path 5.3 Example of determining the root path You can use the network plan (see fig. 32) to follow the flow chart (see fig. 31) for determining the root path. The administrator has specified another priority in the bridge identification for each bridge.
  • Page 68 Spanning Tree 5.3 Example of determining the root path P-BID = 16 384 Bridge 1 P-BID = 20 480 P-BID = 24 576 Bridge 2 Bridge 3 P-BID = 40 960 Bridge 7 P-BID = 28 672 P-BID = 32 768 Port 3 Bridge 4 Bridge 5...

  • Page 69: Example Of Manipulating The Root Path

    Spanning Tree 5.4 Example of manipulating the root path 5.4 Example of manipulating the root path You can use the network plan (see fig. 32) to follow the flow chart (see fig. 31) for determining the root path. The Administrator has performed the following: –...
  • Page 70 Spanning Tree 5.4 Example of manipulating the root path P-BID = 16 384 Bridge 1 P-BID = 32 768 P-BID = 32 768 Bridge 2 Bridge 3 P-BID = 32 768 Bridge 7 P-BID = 32 768 P-BID = 32 768 Port 3 Bridge 4 Bridge 5...

  • Page 71: Example Of Manipulating The Tree Structure

    Spanning Tree 5.5 Example of manipulating the tree structure 5.5 Example of manipulating the tree structure The Management Administrator soon discovers that this configuration with bridge 1 as the root bridge (see on page 67 “Example of determining the root path”) is invalid.

  • Page 72: The Rapid Spanning Tree Protocol

    Spanning Tree 5.6 The Rapid Spanning Tree Protocol 5.6 The Rapid Spanning Tree Protocol The RSTP uses the same algorithm for determining the tree structure as STP. RSTP merely changes parameters, and adds new parameters and mechanisms that speed up the reconfiguration if a link or bridge becomes inoperable.
  • Page 73 Spanning Tree 5.6 The Rapid Spanning Tree Protocol  Edge port Every network segment with no additional RSTP bridges is connected with exactly one designated port. In this case, this designated port is also an edge port. The distinction of an edge port is the fact that it does not receive any RST BPDUs (Rapid Spanning Tree Bridge Protocol Data Units).

  • Page 74: Port States

    Spanning Tree 5.6 The Rapid Spanning Tree Protocol P-BID = 16 384 Bridge 1 P-BID = 20 480 P-BID = 24 576 Bridge 2 Bridge 3 P-BID = 40 960 Bridge 7 P-BID = 28 672 P-BID = 32 768 Priority of the bridge identifikation (BID) P-BID = BID without MAC Address...

  • Page 75: Spanning Tree Priority Vector

    Spanning Tree 5.6 The Rapid Spanning Tree Protocol STP port state Administrative RSTP Active topology bridge port operational Port state (port role) state DISABLED Disabled FALSE Discarding Excluded (disabled) DISABLED Enabled FALSE Discarding Excluded (disabled) BLOCKING Enabled TRUE Discarding Excluded (alternate, backup) LISTENING Enabled TRUE...

  • Page 76: Fast Reconfiguration

    Spanning Tree 5.6 The Rapid Spanning Tree Protocol Based on this information, the bridges participating in RSTP are able to determine port roles themselves and define the port states of their own ports. 5.6.4 Fast reconfiguration Why can RSTP react faster than STP to an interruption of the root path? ...

  • Page 77: Configuring The Rapid Spanning Tree

    Spanning Tree 5.6 The Rapid Spanning Tree Protocol Note: The downside of this fast reconfiguration is the possibility that data packages could be duplicated and/or arrive at the recipient in the wrong order during the reconfiguration phase of the RSTP topology. If this is unacceptable for your application, use the slower Spanning Tree Protocol or select one of the other, faster redundancy procedures described in this manual.
  • Page 78 Spanning Tree 5.6 The Rapid Spanning Tree Protocol  Switch on RSTP on each device Figure 36: Operation on/off UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 79 Spanning Tree 5.6 The Rapid Spanning Tree Protocol  Define the desired switch as the root bridge by assigning it the lowest priority in the bridge information among all the bridges in the network, in the “Protocol Configuration/Information” frame. Note that only multiples of 4,096 can be entered for this value (see table 13).
  • Page 80 Spanning Tree 5.6 The Rapid Spanning Tree Protocol Figure 37: Assigning Hello Time, Forward Delay and Max. Age The times entered in the RSTP dialog are in units of 1 s Example: a Hello Time of 2 corresponds to 2 seconds. ...
  • Page 81 Spanning Tree 5.6 The Rapid Spanning Tree Protocol Parameter Meaning Possible Values Default Setting Priority The priority and the MAC address go 0 < n*4,096 (1000H) < 32,768 (8000H) together to make up the bridge 61,440 (F000H) identification. Hello Time Sets the Hello Time.
  • Page 82 Spanning Tree 5.6 The Rapid Spanning Tree Protocol Diameter = 7 Age = 5 Age = 4 = Root Figure 38: Definition of diameter and age The network diameter is the number of connections between the two devices furthest away from the root bridge. UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 83 Spanning Tree 5.6 The Rapid Spanning Tree Protocol Note: The parameters – Forward Delay and – Max Age have a relationship to each other: Forward Delay ≥ (Max Age/2) + 1 If you enter values that contradict this relationship, the device then replaces these values with a default value or with the last valid values.
  • Page 84 Spanning Tree 5.6 The Rapid Spanning Tree Protocol If you are using the device in a Multiple Spanning Tree (MSTP) environment, the device only participates in the Common Spanning Tree (CST) instance. This chapter of the manual also uses the term Global MST instance to describe this general case.
  • Page 85 Spanning Tree 5.6 The Rapid Spanning Tree Protocol Parameter Meaning Possible Values Default Setting Admin Edge Only activate this setting when a active (box inactive Port terminal device is connected to the selected), inactive port (administrative: default setting). (box empty) Then the port immediately has the forwarding status after a link is set up, without first going through the...
  • Page 86 Spanning Tree 5.6 The Rapid Spanning Tree Protocol Parameter Meaning Possible Values Default Setting Oper Point-to- The device sets the “Oper point-to- true, false Point (read only) point” condition to true if this port The device determines has a full duplex condition to an STP this condition from the device.

  • Page 87: Combining Rstp And Mrp

    Spanning Tree 5.7 Combining RSTP and MRP 5.7 Combining RSTP and MRP In the MRP compatibility mode, the device allows you to combine RSTP with MRP. With the combination of RSTP and MRP, the fast switching times of MRP are maintained.
  • Page 88 Spanning Tree 5.7 Combining RSTP and MRP To combine RSTP with MRP, you perform the following steps in sequence:  Configure MRP on all devices in the MRP-Ring.  Close the redundant line in the MRP-Ring.  Activate RSTP at the RSTP ports and also at the MRP-Ring ports. ...

  • Page 89: Application Example For The Combination Of Rstp And Mrp

    Spanning Tree 5.7 Combining RSTP and MRP 5.7.1 Application example for the combination of RSTP and MRP The figure (see fig. 41) shows an example for the combination of RSTP and MRP. Parameters MRP settings Ring redundancy: MRP version Ring port 1 Ring port 2 Port from MRP-Ring to the RSTP network...
  • Page 90 Spanning Tree 5.7 Combining RSTP and MRP Prerequisites for further configuration:  You have configured the MRP settings for the devices in accordance with the above table.  The redundant line in the MRP-Ring is closed. Figure 41: Application example for the combination of RSTP and MRP 1: MRP-Ring, 2: RSTP-Ring, 3: Redundant RSTP connection RM: Ring Manager S2 is RSTP Root Bridge...
  • Page 91 Spanning Tree 5.7 Combining RSTP and MRP Switch to the Configuration mode. exit Switch to the interface configuration mode for interface 1/3 port 1.3. Activate RSTP on the port. spanning-tree port mode Switch to the Configuration mode. exit  Configure the global settings, using S1 as an example: –...

  • Page 92: A Readers' Comments

    Readers’ Comments A Readers’ Comments What is your opinion of this manual? We are always striving to provide as comprehensive a description of our product as possible, as well as important information that will ensure trouble-free operation. Your comments and suggestions help us to further improve the quality of our documentation.
  • Page 93 Please fill out and return this page  as a fax to the number +49 (0)7127 14-1600 or  by post to Hirschmann Automation and Control GmbH Department 01RD-NT Stuttgarter Str. 45-51 72654 Neckartenzlingen UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 94 Readers’ Comments UM Redundancy Configuration L2E Release 7.1 12/2011...

  • Page 95: B Index

    Index B Index Advanced Mode RST BPDU 73, 75 RSTP Alternate port 73, 73 Rapid Spanning Tree Redundancy Redundancy Manager Backup port Redundancy existing 20, 24 Bridge Identifier 60, 60 Redundancy functions Redundant Redundant Coupling 9, 11 Configuration error 20, 24 Redundant connections Configuring the HIPER-Ring Redundant coupling...
  • Page 96 Index UM Redundancy Configuration L2E Release 7.1 12/2011...

  • Page 97: C Further Support

    Further Support C Further Support Technical Questions  For technical questions, please contact any Hirschmann dealer in your area or Hirschmann directly. You will find the addresses of our partners on the Internet at http://www.beldensolutions.com Contact our support at https://hirschmann-support.belden.eu.com...
  • Page 98 Further Support With the Hirschmann Competence Center, you have decided against making any compromises. Our client-customized package leaves you free to choose the service components you want to use. Internet: http://www.hicomcenter.com UM Redundancy Configuration L2E Release 7.1 12/2011...
  • Page 99 Further Support UM Redundancy Configuration L2E Release 7.1 12/2011...

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