CN101262402B

CN101262402B - A method for realizing redundant backup between loop networks

Info

Publication number: CN101262402B
Application number: CN2007101769891A
Authority: CN
Inventors: 张国刚; 陈凡民; 马化一; 薛百华
Original assignee: Kyland Technology Co Ltd
Current assignee: Kyland Technology Co Ltd
Priority date: 2007-11-08
Filing date: 2007-11-08
Publication date: 2011-08-10
Anticipated expiration: 2027-11-08
Also published as: CN101262402A

Abstract

The invention relates to an implementing method for redundant backup between ring networks and is called DT-ring+ for short. A network topology of the method is as shown in Figure 1. The implementing method is firstly characterized in that a function of mutual backup of two ring networks through two link circuits is provided and the time of redundancy switching is less than 30ms; secondly a DT-ring+ protocol is initialed between a Ring 1 and a Ring 2 when the topology structure as shown in the Figure 1 is formed, and is only initialed in Switches B and C, the Switch B is provided with a DT-ring+ ring port 1 (which is in a Forwarding status) and the Switch C is provided with a DT-ring+ ring port 2 (which is in a Blocking status); no DT-ring+ protocol is initialed in Switch E and Switch G. The operation in the network can be quickly switched when the network is broken at any point, and even when a connection failure of two points occurs in any DT-Ring, thereby improving the reliability of the industrial site network.

Description

A kind of implementation method of redundant backup between loop networks

Technical field

The present invention relates between the Industrial Ethernet redundancy loop fast-speed redundancy between the quick switching technique of dual link field, particularly redundancy loop and redundancy loop and switch, for interannular communication provides redundant double copies link.

Background technology

The pattern of redundant looped network communication is adopted in industry spot communication, if the pattern that communication can only be adopted single-link communication between two redundant looped networks perhaps adopts RSTP to realize dual link, but redundancy time more than 30ms, can not satisfy the demand of industry spot communication.The pattern of exploitation interannular redundant link communication has not only solved the field demand of industrial data dual homed, and has improved the reliability of industrial ready-made data.

DT-ring+ interannular redundant technique is improved on the technical foundation of the fast-speed redundancy technology DT-ring of maturation and is formed, the message format of employing standard, the criterion of communicating by letter efficiently, make the link that forms backup between looped network and the looped network, the DT-ring+ technology has solved the problem of interannular dual link backup, for industry spot data dual homed provides reliable guarantee, also provide reliable guarantee on earth for Industrial Ethernet technology one net simultaneously.

Summary of the invention

A kind of implementation method of redundant backup between loop networks is finished the function that two looped networks back up mutually by two links, and redundant switching time is less than 30ms.During composition diagram 1 topological structure, between Ring1 and Ring2, enable the DT-ring+ agreement, only need Switch B, C to enable the DT-ring+ agreement.At Switch B DT-ring+ central port 1 (this port is in the Forwarding state) is set, DT-ring+ central port 2 (this port is in the Blockding state) is set at Switch C.Do not enable the DT-ring+ agreement on Switch E, the Switch G.

Guarantee in the described DT-ring+ agreement that any two equipment connect when breaking down in the Ring1, network is switched and finished in 30ms, and is normal with communicating by letter of Ring2.

Described DT-ring+ agreement guarantees that any two equipment connect when breaking down in the Ring2, and network is switched and finished in 30ms, and is normal with communicating by letter of Ring1.

Described DT-ring+ agreement guarantees that simultaneously any two equipment connect when breaking down in the Ring1,2, and network is switched and finished in 30ms, and Ring1 is normal with communicating by letter of Ring2.

Described DT-ring+ agreement network configuration as shown in Figure 1 can infinite cascaded, can be Ring1 and ring2, and Ring2 and Ring3 provide the dual link redundancy.

The Switch A of main website of Ring1 and slave station Switch B, SwitchC participate in the operation of the agreement of DT-ring+.

The DT-ring+ agreement further develops on DT-ring agreement basis.

Switch B, the Switch C that disposes the backup central port is checked through this port LINK when starting after, two backup central ports are in the Blocking state; Switch B, Switch C to the probe messages of two central port transmission types 1 of Ring1, judge that by Device ID size the central port of that backup is in Forwarding or Blocking state respectively.The little Switch of Device ID with oneself backup central port by Blocking state transition to the Forwarding state.The big Switch of Device ID still is in the Blocking state with the backup central port of oneself.

All switches of Ring1 are supported the DT-ring+ agreement, and the switch of Ring2 can not supported the DT-ring+ agreement.

Between changing wherein one when take place interrupting of two backup links, the another one backup link is switched in 30ms and is finished, and can proper communication.

When the link between any two equipment connect in the Ring1 ring took place to interrupt, the communicating by letter with switching at 30ms of two interannulars of Ring1 and Ring2 finished, and the energy proper communication.

When the link between any two equipment connect in the Ring2 ring took place to interrupt, the communicating by letter with switching at 30ms of two interannulars of Ring1 and Ring2 finished, and the energy proper communication.

Can realize a plurality of ring dual link cascades, for the dual link redundancy is provided between the cascade looped network.

Industrial switch with DT-ring+ agreement can be realized the dual link redundancy feature between the redundant looped network of Fig. 1.

Do not dispose the industrial switch of DT-ring+ agreement, the DT-ring+ message is transmitted.And the action of the relevant data message of response.

In view of this, the invention provides the implementation method of standby redundancy link between a kind of redundancy loop.Concrete inventive embodiments such as Fig. 1

When the present invention realizes Fig. 1 topology, at first want the standby redundancy port of configuring redundancy interannular, after port LINK set up, the standby redundancy port of all interannulars all was in the Blocking state.

The strategy that adopts equipment to be at war with among the present invention according to Device ID size with backup central port.To the Forwarding state, the interannular redundancy backup port that Device ID is big still is in the Blocking state to the redundancy backup port by the Blocking state between Device ID circlet.

Consider simultaneously among the present invention if when having only the state of an interannular link backup central port is in which territory, the main website in which territory participates in the state of backup port and specifies, by the Blocking state to the Forwarding state.

The present invention supports, under the state of Fig. 2, is in the interannular redundancy backup port of Blocking state originally, by the Blocking state to the Forwarding state.

The present invention supports, under the state of Fig. 3, is in the interannular redundancy backup port of Blocking state originally, by the Blocking state to the Forwarding state.

The present invention supports, under the state of Fig. 4, is in the interannular redundancy backup port of Blocking state originally, by the Blocking state to the Forwarding state.

The present invention supports, under the state of Fig. 5, is in the interannular redundancy backup port of Blocking state originally, by the Blocking state to the Forwarding state.

The present invention supports, when network recovery just often, the Blocking state is arrived with own state transition in the backup central port 2 that was in the Forwarding state originally.The state of backup central port 1 is by Blocking state transition Forwarding state.

The all states of the present invention are switched all and are finished in 30ms.

The present invention has defined 10 type control messages in the process that realizes, the control message is defined as follows:

The ■ Class1: request backup port state transfers forwarding to

■ type 2, type 8: backup port can be made as forwarding

■ type 3: inquiry neighbor state

■ type 4: response neighbor state

■ type 5: backup port is made as blocking

■ type 6, type 9: expression setting is finished

■ type 7: port is that the port of forwarding exists

■ Class1 0: require clear MAC

The link that the present invention relies on the message of above 10 types to keep interannular is realized double copies, can switch operate as normal fast under business datum is nonserviceabled.

Description of drawings

Fig. 1 interannular redundancy backup topology

Fig. 2 malfunction 1

Fig. 3 malfunction 2

Fig. 4 malfunction 3

Fig. 5 malfunction 4

Fig. 6 backs up

central port

1,2 state machines/port effect (active and standby/from being equipped with) state machine

The equipment state that Fig. 7 is connected with backup

central port

1,2 changes (neighbours)/backup port neighbor state machine

Embodiment

1. competition changes for the equipment state of backup

central port

1,2

Backup

central port

1,2 state machines change as Fig. 6

2. the equipment state that is connected with backup

central port

1,2 changes (neighbours)

LINK UP	Receive Ce Shibaowen ﹠﹠ neighbor port==LINK UP → NULL	LINK UP
			Receive Ce Shibaowen ﹠﹠ neighbor port==LINK Down → state upgrades	LINK Down
	Ding Shiqichaoshi ﹠﹠ expired times＜3 → timer expiry counting ++	LINK UP

LINK DOW N	Receive Ce Shibaowen ﹠﹠ neighbor port==LINK UP → NULL	LINKUP
			Receive Ce Shibaowen ﹠﹠ neighbor port==LINK Down → state upgrades	LINKDown
	Ding Shiqichaoshi ﹠﹠ expired times＜3 → timer expiry counting ++	LINKDOWN
			Ding Shiqichaoshi ﹠﹠ expired times＞=3 → timer expiry counting ++	INVALID

Claims

1. the implementation method of a redundant backup between loop networks is characterized in that finishing the function that two looped networks back up mutually by two links, and redundant switching time is less than 30ms; When forming topological structure, between Ring1 and Ring2, enable the DT-ring+ agreement, only need Switch B, SwitchC to enable the DT-ring+ agreement, at Switch B DT-ring+ central port 1 this port is set and is in the Forwarding state, at Switch C DT-ring+ central port 2 these ports are set and are in the Blocking state, do not enable the DT-ring+ agreement on Switch E, the Switch G;

Described DT-ring+ agreement guarantees that any two equipment connect when breaking down in the Ring1, and network is switched and finished in 30ms, and is normal with communicating by letter of Ring2;

Described DT-ring+ agreement guarantees that any two equipment connect when breaking down in the Ring2, and network is switched and finished in 30ms, and is normal with communicating by letter of Ring1;

Described DT-ring+ agreement guarantees that simultaneously any two equipment connect when breaking down in the Ring1,2, and network is switched and finished in 30ms, and Ring1 is normal with communicating by letter of Ring2;

The network configuration of described DT-ring+ agreement can infinite cascaded, can be Ring1 and Ring2, and Ring2 and Ring3 provide the dual link redundancy.

2. method according to claim 1 is characterized in that the Switch A of main website of Ring1 and the operation that slave station Switch B, SwitchC participate in the agreement of DT-ring+.

3. method according to claim 1 is characterized in that the DT-ring+ agreement further develops on DT-ring agreement basis.

4. method according to claim 1 and 2, Switch B, the Switch C that it is characterized in that disposing the backup central port is checked through this port LINK when starting after, two backup central ports are in the Blocking state; Switch B, Switch C to the probe messages of two central port transmission types 1 of Ring1, judge that by Device ID size the central port of that backup is in Forwarding or Blocking state respectively; The little Switch of Device ID with oneself backup central port by Blocking state transition to the Forwarding state; The big Switch of Device ID still is in the Blocking state with the backup central port of oneself.

5. method according to claim 1 and 2 is characterized in that all switches of Ring1 are supported the DT-ring+ agreement, and switch Switch E, the Switch G of Ring2 do not support the DT-ring+ agreement.

6. method according to claim 1 and 2, when it is characterized in that wherein generation interruption of two backup links between changing, the another one backup link is switched in 30ms and is finished, and can proper communication.

7. according to claims 1 or 2 described methods, when it is characterized in that link between any two equipment connect in the Ring1 ring takes place to interrupt, the communicating by letter with switching at 30ms of two interannulars of Ring1 and Ring2 finishes, and the energy proper communication.

8. method according to claim 1 and 2, when it is characterized in that link between any two equipment connect in the Ring2 ring takes place to interrupt, the communicating by letter with switching at 30ms of two interannulars of Ring1 and Ring2 finishes, and the energy proper communication.

9. method according to claim 1 is characterized in that realizing a plurality of ring dual link cascades, for the dual link redundancy is provided between the cascade looped network.

10. method according to claim 1, the industrial switch that it is characterized in that having the DT-ring+ agreement can be realized the dual link redundancy feature between redundant looped network.