Moxa PT-7728-PTP User Manual

PT-7728-PTP Communication Redundancy

User’s Manual

Edition 1.0, June 2016

www.moxa.com/product

Communication Redundancy

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User’s Manual

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Table of Contents

1. Introduction to Communication Redundancy .................................................................................... 1-1

2. Turbo Ring ........................................................................................................................................ 2-1

The Turbo Ring Concept ...................................................................................................................... 2-2

Setting up “Turbo Ring” or “Turbo Ring V2” ............................................................................................ 2-2

Determining the Redundant Path of a “Turbo Ring” Ring................................................................... 2-2

Determining the Redundant Path of a “Turbo Ring V2” Ring .............................................................. 2-3

Ring Coupling Configuration .......................................................................................................... 2-3

Dynamic Ring Coupling (DRC) Configuration (applies only to “Turbo Ring V2”) .................................... 2-5

Dual-Ring Configuration (applies only to “Turbo Ring V2”) ................................................................ 2-6

Dual-Homing Configuration (applies only to “Turbo Ring V2”) ........................................................... 2-7

Configuring “Turbo Ring” and “Turbo Ring V2” ........................................................................................ 2-7

Configuring “Turbo Ring” .............................................................................................................. 2-7

Configuring “Turbo Ring V2” ....................................................................................................... 2-10

Configuring “Turbo Ring V2” with Dynamic Ring Coupling (DRC) ..................................................... 2-14

3. Turbo Chain ....................................................................................................................................... 3-1

The Turbo Chain Concept ..................................................................................................................... 3-2

Setting Up Turbo Chain ....................................................................................................................... 3-2

Configuring “Turbo Chain”.................................................................................................................... 3-3

Head Switch Configuration ............................................................................................................ 3-3

Member Switch Configuration ....................................................................................................... 3-3

Tail Switch Configuration .............................................................................................................. 3-3

4. STP/RSTP/MSTP ............................................................................................................................... 4-1

The STP/RSTP/MSTP Concept ............................................................................................................... 4-2

What is STP? .............................................................................................................................. 4-2

How STP Works ........................................................................................................................... 4-3

Differences between STP, RSTP, and MSTP ..................................................................................... 4-4

STP Example ...................................................................................................................................... 4-5

Using STP on a Network with Multiple VLANs .......................................................................................... 4-6

Configuring STP/RSTP ......................................................................................................................... 4-6

Configuring MSTP ............................................................................................................................... 4-8

Configuration Limits of STP/RSTP ........................................................................................................ 4-11

5. IEC 62439-3 Protocol ........................................................................................................................ 5-1

IEC 62439-3 Protocol .......................................................................................................................... 5-2

RSTP Grouping ............................................................................................................................ 5-2

NOTE

Most of Moxa’s managed switches now support three proprietary Turbo Ring protocols

Fast

you to construct any

Fast Ethernet ports and under 50

In this manual, we use the terminology

configured for one or the other of these protocols.

1. Introduction to Communication

Redundancy

Setting up Communication Redundancy on your network helps protect critical links against failure, protects

against network loops, and keeps network downtime at a minimum.

Communication Redundancy allows you to set up redundant loops in the network to provide a backup data

transmission route in the event that a cable is inadvertently disconnected or damaged. This is a particularly

important feature for industrial applications, since it could take several minutes to locate the disconnected or

severed cable. For example, if the Moxa switch is used as a key communications component of a production line,

several minutes of downtime could cause a big loss in production and revenue. The Moxa switch supports three

different protocols to support this communication redundancy function:

• Turbo Ring and Turbo Ring V2

• Turbo Chain

• Rapid Spanning Tree and Spanning Tree Protocols (IEEE 802.1W/802.1D-2004)

When configuring a redundant ring, all switches on the same ring must be configured to use the same

redundancy protocol. You cannot mix the Turbo Ring, Turbo Ring V2, and STP/RSTP protocols on the same ring.

The following table lists the key differences between the features of each protocol. Use this information to

evaluate the benefits of each, and then determine which features are most suitable for your network.

Turbo Ring Turbo Ring V2 Turbo Chain STP RSTP

Topology Ring Ring Chain Ring, Mesh Ring, Mesh

Fast Ethernet

Recovery Time

Gigabit Ethernet

Recovery Time

Turbo Ring refers to the original version of Moxa’s proprietary redundant ring protocol, which has a

recovery time of under 300 ms.

Turbo Ring V2 refers to the new generation Turbo Ring, which has a recovery time of under 20 ms for

Ethernet ports and under 50 ms for Gigabit Ethernet ports.

Turbo Chain is a new Moxa proprietary protocol with unlimited flexibility that allows

type of redundant network topology. The recovery time is under 20 ms for

ms for Gigabit Ethernet ports. To achieve a recovery time under 50 ms in a Gigabit Turbo Chain, we

recommend using a Gigabit fiber port as Head port.

< 300 ms < 20 ms < 20 ms Up to 30 sec. Up to 5 sec.

< 50 ms < 50 ms

Turbo Ring and Turbo Ring V2 to differentiate between rings

Communication Redundancy Introduction to Communication Redundancy

1-2

Ethernet has become the defa

medium for industrial automation applications. In fact,

Ethernet i

high

network.

Gigabit Turbo Ring, if any segm

disconnected, your automation system will be back to

normal in less than

Ring V2)

NOTE

Port trunking and Turbo

bandwidth of the backbone, and also provide redundancy. For example, suppose that two physical ports, 1 and

2, are trunked to form trunk group Trk1, and then Trk1 is set as o

disconnected, the remaining trunked port, port 2, will share the traffic. If ports 1 and 2 are both disconnected,

the

Gigabit Ethernet Redundant Ring Capability (< 50 ms)

ult data communications

s often used to integrate video, voice, and

-rate industrial application data transfers into one

Moxa switches come equipped with a redundant

igabit Ethernet protocol called Gigabit Turbo Ring. With

ent of the network gets

300 ms (Turbo Ring) or 50 ms (Turbo

Turbo Ring will create a backup path within 300 ms.

Ring can be enabled simultaneously to form a backbone. Doing so will increase the

ne Turbo Ring path. If port 1 gets



2. Turbo Ring

The following topics are covered in this chapter:

The Turbo Ring Concept

Setting up “Turbo Ring” or “Turbo Ring V2”

 Determining the Redundant Path of a “Turbo Ring” Ring

 Determining the Redundant Path of a “Turbo Ring V2” Ring

 Ring Coupling Configuration

 Dynamic Ring Coupling (DRC) Configuration (applies only to “Turbo Ring V2”)

 Dual-Ring Configuration (applies only to “Turbo Ring V2”)

 Dual-Homing Configuration (applies only to “Turbo Ring V2”)

Configuring “Turbo Ring” and “Turbo Ring V2”

 Configuring “Turbo Ring”

 Configuring “Turbo Ring V2”

 Configuring “Turbo Ring V2” with Dynamic Ring Coupling (DRC)

Communication Redundancy Turbo Ring

2-2

If there are 2N

Ring”

segments connected to the (N+1)

directly opposite the

The Turbo Ring Concept

Moxa developed the proprietary Turbo Ring protocol to optimize communication redundancy and achieve a

faster recovery time on the network.

The Turbo Ring and Turbo Ring V2 protocols identify one switch as the master of the network, and then

automatically block packets from traveling through any of the network’s redundant loops. In the event that one

branch of the ring gets disconnected from the rest of the network, the protocol automatically readjusts the ring

so that the part of the network that was disconnected can reestablish contact with the rest of the network.

Setting up “Turbo Ring” or “Turbo Ring V2”

Select any two ports as redundant ports.

Connect the redundant ports to form the Turbo Ring.

The user does not need to configure any of the switches as the master to use Turbo Ring or Turbo Ring V2. If

none of the switches in the ring is configured as the master, then the protocol will automatically assign master

status to one of the switches. In fact, the master is only used to identify which segment in the redundant ring

acts as the backup path. In the following subsections, we explain how the redundant path is selected for rings

configured for Turbo Ring, and Turbo Ring V2.

Determining the Redundant Path of a “Turbo Ring” Ring

In this case, the redundant segment (i.e., the segment that will be blocked during normal operation) is

determined by the number of switches in the ring, and where the ring master is located.

When the Number of Switches in the Turbo Ring is Even

switches (an even number) in the “Turbo

ring, then the backup segment is one of the two

st switch (i.e., the switch

master).

Communication Redundancy Turbo Ring

2-3

If there are 2N+1

(an odd number) in the “Turbo

Ring”

counterclockwise, then segment N+1 will serve as the

backup path.

For the example shown here, N=1, so that N+1=2.

For a

segment connected to the 2nd redundant port on the

master.

See

Configuring “Turbo

Ring” and “Turbo Ring V2”

ATTENTION

join all VLANs,

switches

When the Number of Switches in the Turbo Ring is Odd

switches

ring, with switches and segments labeled

Determining the Redundant Path of a “Turbo Ring V2” Ring

“Turbo Ring V2” ring, the backup segment is the

Configuring “Turbo Ring V2” in the

section below.

Ring Coupling Configuration

For some systems, it may not be convenient to connect all devices in the system to create one BIG redundant

ring, since some devices could be located in a remote area. For these systems, Ring Coupling can be used to

separate the devices into different smaller redundant rings, but in such a way that they can still communicate

with each other.

a VLAN environment, the user must set Redundant Port, Coupling Port, and Coupling Control Port

since these ports act as the backbone to transmit all packets of different VLANs to different

Communication Redundancy Turbo Ring

2-4

ATTENTION

Ring Coupling only needs to be enabled on one of the switches serving as the Ring Coupler. The Coupler must

designate different ports as the two Turbo Ring ports and the coupling port.

Ring Coupling for a “Turbo Ring” Ring

To configure the Ring Coupling function for a “Turbo Ring” ring, select two switches (e.g., Switch A and B in the

above figure) in the ring, and another two switches in the adjacent ring (e.g., Switch C and D). Decide which

two ports in each switch are appropriate to be used as coupling ports, and then link them together. Next, assign

one switch (e.g., Switch A) to be the coupler and connect the coupler’s coupling control port with Switch B (for

this example).

The coupler switch (i.e., Switch A) will monitor switch B through the coupling control port to determine whether

or not the coupling port’s backup path should be recovered.

Ring Coupling for a “Turbo Ring V2” Ring

Note that the ring coupling settings for a “Turbo Ring V2” ring are different from a “Turbo Ring” ring. For Turbo

Ring V2, Ring Coupling is enabled by configuring the Coupling Port (Primary) on Switch B, and the Coupling

Port (Backup) on Switch A only. You do not need to set up a coupling control port, so that a “Turbo Ring V2”

ring does not use a coupling control line.

The Coupling Port (Backup) on Switch A is used for the backup path, and connects directly to an extra

network port on Switch C. The Coupling Port (Primary) on Switch B monitors the status of the main path,

and connects directly to an extra network port on Switch D. With ring coupling established, Switch A can

activate the backup path as soon as it detects a problem with the main path.

Communication Redundancy Turbo Ring

2-5

NOTE

You do not need to use the same

switch for both Ring Coupling and Ring Master.

Dynamic Ring Coupling (DRC) Configuration (applies only to

“Turbo Ring V2”)

Moxa’s switch supports Turbo Ring V2 with Dynamic Ring Coupling (DRC), which is an innovative inter-consist

network redundancy technology. It not only supports Ring Coupling (RC), which enables fast network recovery

during link failures, but also automatically assigns the active coupler switch on each train consist when train

consist sequences are changed, added, or removed. This not only prevents looping and broadcast storms, but

also reduces additional configuration time and possible errors caused by user configuration, enhancing network

communication reliability and efficiency.

Turbo Ring V2 with DRC (Dyanmic Ring Coupling)

DRC

Active

DRC

group 2

Active

DRC

group 1

Active

DRC

Active

DRC

group 2

DRC

Note that the dynamic ring coupling settings are only supported by “Turbo Ring V2”.

(1) DRC Group 1 requires one or two switches as members of a ring (Diagram 1: Left side of ring A, B, C;

or Diagram 2: Left side of ring A, C, and right side of ring B).

(2) DRC Group 2 requires one or two switches as members of a ring (Diagram 1: Right side of ring A, B, C;

or Diagram 2: Right side of ring A, C and left side of ring B).

DRC

Active

Turbo Ring V2 with DRC Diagram 1

Turbo Ring V2 with DRC Diagram 2

DRC

group 1

DRC

group 1

DRC

group 1

DRC

Active

DRC

(3) Ring Coupler – Scenario 1:

Linking all members of DRC group 1 to the member of the another ring DRC group 2 (Diagram 1: The

left side DRC group 1 of ring C coupled to right side DRC group 2 of ring B); or

linking all members of DRC group 1 to the member of the another ring DRC group 1 (Diagram 2: The

right side of DRC group 1 of ring B coupled to the left side of DRC group 1 of ring C); or

no connection to DRC group 1 (Diagram 1: The left side DRC group 1 of ring A).

Communication Redundancy Turbo Ring

2-6

ATTENTION

The

Ring, Turbo Ring v2, Turbo Ring V2 with DRC (Dyanmic Ring Coupling) and Turbo Chain

NOTE

Bypass function is used to apply on linear topology only.

(4) Ring Coupler – Scenario 2:

By linking all members of DRC group 2 to the member of the another ring DRC group 1 (Diagram 1: The

right side DRC group 2 of ring A coupler to left side DRC group 1 of ring B)

or by linking all members of DRC group 2 to the member of the another ring DRC group 2 (Diagram 2:

The right side DRC group 2 of ring A coupler to left side DRC group 2 of ring B)

or no connection of the DRC group 2 (Diagram 2: The right side DRC group 2 of ring C)

(5) After all cable connections complete, the DRC protocol will start convergence and automatically assign

one DRC group of the ring as Active DRC group.

ports which support bypass function cannot be used in redundant protocol like STP, RSTP, MSTP, Turbo

Dual-Ring Configuration (applies only to “Turbo Ring V2”)

The dual-ring option provides another ring coupling configuration, in which two adjacent rings share one

switch. This type of configuration is ideal for applications that have inherent cabling difficulties.

Dual-Ring for a “Turbo Ring V2” Ring

Communication Redundancy Turbo Ring

2-7

Dual-Homing Configuration (applies only to “Turbo Ring V2”)

The dual-homing option uses a single Ethernet switch to connect two networks. The primary path is the

operating connection, and the backup path is a back-up connection that is activated in the event that the

primary path connection fails.

Dual-Homing for a “Turbo Ring V2” Ring

Configuring “Turbo Ring” and “Turbo Ring V2”

Use the Communication Redundancy page to select Turbo Ring, Turbo Ring V2, or Turbo Chain. Note

that configuration pages for these three protocols are different.

Configuring “Turbo Ring”

+ 27 hidden pages