CN101741674A - Method for realizing redundant ring and network recovery in Ethernet - Google Patents
Method for realizing redundant ring and network recovery in Ethernet Download PDFInfo
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Abstract
The invention belongs to the technical field of Ethernet communication, in particular relating to a method for realizing redundant ring and network recovery in Ethernet. An Ethernet ring network is formed by a plurality of switches which are connected into a ring physically and are in a chain structure logically. The invention is characterized in that only one of the switches is set to be a master station in charge of controlling the logic structure of network, the other switches are set to be slave stations; the master station and each slave station are provided with two ring ports; the state switching of the ring ports of each switch can realize backup of redundant ring chain, thus realizing network redundancy and recovery. The invention has the beneficial effects of being capable of rapidly detecting chain fault in the ring, building new network topology to recover network in occurrence of fault, realizing backup of redundant ring chain through state switching of ring port of each switchboard; and the invention has simple and effective method and can realize high applicability of industrial control network.
Description
Technical field
The invention belongs to Ethernet communication technology field, be specifically related to realize in a kind of Ethernet the method for looped network redundancy and network recovery.
Background technology
Ethernet technology since have opening, stability, with low cost, transmission rate is high, be easy to plurality of advantages such as networking, progresses into industrial control field, becomes the part of automated communication network; And the network recovery method of generally using in the redundant network that Ethernet is formed is Spanning-Tree Protocol (STP) and RSTP (RSTP), because its network recovery time is several seconds to tens seconds, can not satisfy the requirement of industrial control network real-time communication.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of link failure that can detect apace in the looped network in the Ethernet ring l network, and can set up new network topology and recover network when fault takes place, and realize the method for communication redundancy.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of Ethernet is realized the method for looped network redundancy and network recovery, form the Ethernet ring l network by a plurality of switches, switch connects into ring physically, it logically is chain structure, it is characterized in that: have and only have one in the described switch and be set to main website, main website is responsible for the Control Network logical construction, other are set to slave station, switch realization looped network redundancy link backup by each switch central port state, existing network network method redundant and that recover is as follows in fact:
1. main website and each slave station all have two central ports, and each central port all can be set to forwarding state or blocked state, transmit all Ethernet messages under the forwarding state; Do not transmit the general service message under the blocked state, only transmit preset link detection messages (Test), topology changed messages (TopologyChange), link failure message (LinkDown) and link-recovery message (LinkUp);
2. main website working method: main website periodically sends link detection message (Test) to two central ports respectively with the default time interval, if link detection message (Test) can be received by main website before overtime, illustrate that then the loop chain road is in closure state, one of the central port of main website is made as forwarding state, and another is made as blocked state; If link detection message (Test) is not received by main website in Preset Time, illustrate that then the loop chain road is in off-state, two central ports of main website all are made as forwarding state;
3. slave station working method: if slave station detects this machine central port link failure or link-recovery, then reset the central port state, and send link failure messages (LinkDown) or link-recovery message (LinkUp) to two central ports respectively; If receive link failure message (LinkDown), link-recovery message (LinkUp), link detection message (Test) or topology changed messages (TopologyChange), then transmit to another central port from standing in a central port;
4. main website and slave station interactive mode: if link failure message (LinkDown) or link-recovery message (LinkUp) that slave station sends are received by main website, then quicken link detecting, promptly reduce to send the time interval of link detection message (Test); Line state changes if main website detects loop chain, then resets the central port state, empties mac address forwarding table, and sends topology changed messages (TopologyChange) notice slave station to two central ports respectively; If slave station is received the topology changed messages (TopologyChange) that main website sends, then reset the central port state, and empty mac address forwarding table.
Network Cheng Huan not logically during in order to ensure link failure recovery, when the network uplink takes place to interrupt, be made as blocked state with these link-attached two slave station central ports, send link failure message (LinkDown) notice main website, main website is made as forwarding state with the former central port that is in blocked state after receiving link failure message (LinkDown); When the fault recovery of network uplink, send link-recovery message (LinkUp) notice main website earlier with these link-attached two slave stations, main website is made as blocked state with a central port detecting under the ring situation of closing, and sending topology changed messages (TopologyChange) notice slave station, slave station is made as forwarding state with the former central port that is in blocked state after receiving topology changed messages (TopologyChange) again.
In order to improve the agreement robustness, avoid when the link loose contact, causing the uncertainty of agreement sequential, two transient state are set, single transient state and dual link transient state of connecting, the i.e. transient state of transient state when having only a central port to connect when all being connected corresponding to two central ports in slave station; When having only a central port, slave station connects, and detect another central port and just connect, then be introduced into dual link transient state, start connect timer, reach the dual link stable state again after timer expiry or slave station are received topology changed messages (TopologyChange) connecting; When two central ports of slave station all connect, and detect a central port and just disconnect, then be introduced into single transient state that connects, start and disconnect timer, reach single stable state that connects after timer expiry or slave station are received topology changed messages (TopologyChange) again disconnecting.
The invention has the beneficial effects as follows: can detect the link failure in the looped network apace, and can when fault takes place, set up new network topology and recover network, switch realization looped network redundancy link backup by each switch central port state, method is simply effective, can realize the high availability of industrial control network.
Description of drawings
Fig. 1 looped network closure state schematic diagram;
Fig. 2 looped network off-state schematic diagram;
Fig. 3 main website protocol state machine conversion schematic diagram;
Fig. 4 slave station protocol state machine conversion schematic diagram.
Embodiment
A kind of Ethernet is realized the method for looped network redundancy and network recovery, form the Ethernet ring l network by a plurality of switches, switch connects into ring physically, it logically is chain structure, it is characterized in that: have and only have one in the described switch and be set to main website, main website is responsible for the Control Network logical construction, and other are set to slave station, switch realization looped network redundancy link backup by each switch central port state, existing network network method redundant and that recover is as follows in fact:
1. main website and each slave station all have two central ports, and each central port all can be set to forwarding state or blocked state, transmit all Ethernet messages under the forwarding state; Do not transmit the general service message under the blocked state, only transmit preset link detection messages (Test), topology changed messages (TopologyChange), link failure message (LinkDown) and link-recovery message (LinkUp);
2. main website working method: main website periodically sends link detection message (Test) to two central ports respectively with the default time interval, if link detection message (Test) can be received by main website before overtime, illustrate that then the loop chain road is in closure state, one of the central port of main website is made as forwarding state, and another is made as blocked state; If link detection message (Test) is not received by main website in Preset Time, illustrate that then the loop chain road is in off-state, two central ports of main website all are made as forwarding state;
3. slave station working method: if slave station detects this machine central port link failure or link-recovery, then reset the central port state, and send link failure messages (LinkDown) or link-recovery message (LinkUp) to two central ports respectively; If receive link failure message (LinkDown), link-recovery message (LinkUp), link detection message (Test) or topology changed messages (TopologyChange), then transmit to another central port from standing in a central port;
4. main website and slave station interactive mode: if link failure message (LinkDown) or link-recovery message (LinkUp) that slave station sends are received by main website, then quicken link detecting, promptly reduce to send the time interval of link detection message (Test); Line state changes if main website detects loop chain, then resets the central port state, empties mac address forwarding table, and sends topology changed messages (TopologyChange) notice slave station to two central ports respectively; If slave station is received the topology changed messages (TopologyChange) that main website sends, then reset the central port state, and empty mac address forwarding table.
Described Ethernet is realized the method for looped network redundancy and network recovery, also comprise when guaranteeing link failure recovery the network method of Cheng Huan not logically: when the network uplink takes place to interrupt, be made as blocked state with these link-attached two slave station central ports, send link failure message (LinkDown) notice main website, main website is made as forwarding state with the former central port that is in blocked state after receiving link failure message (LinkDown); When the fault recovery of network uplink, send link-recovery message (LinkUp) notice main website earlier with these link-attached two slave stations, main website is made as blocked state with a central port detecting under the ring situation of closing, and sending topology changed messages (TopologyChange) notice slave station, slave station is made as forwarding state with the former central port that is in blocked state after receiving topology changed messages (TopologyChange) again.
Described Ethernet is realized the method for looped network redundancy and network recovery, also comprise the method that improves the agreement robustness: for fear of the uncertainty that causes the agreement sequential when the link loose contact, two transient state are set in slave station, single transient state and dual link transient state of connecting, the i.e. transient state of transient state when having only a central port to connect when all being connected corresponding to two central ports; When having only a central port, slave station connects, and detect another central port and just connect, then be introduced into dual link transient state, start connect timer, reach the dual link stable state again after timer expiry or slave station are received topology changed messages (TopologyChange) connecting; When two central ports of slave station all connect, and detect a central port and just disconnect, then be introduced into single transient state that connects, start and disconnect timer, reach single stable state that connects after timer expiry or slave station are received topology changed messages (TopologyChange) again disconnecting.
Above method can be divided into the main website agreement and the slave station agreement is described respectively, below by the state machine of accompanying drawing in conjunction with main website and slave station the present invention is further described.
Fig. 1 is a looped network closure state schematic diagram, as shown in FIG., form the Ethernet ring l network by some switches, switch connects into ring physically, has and only has one in the described switch and be set to main website, main website is responsible for the Control Network logical construction, other are set to slave station, and main website and each slave station all have two central ports, when the loop chain road is in closure state, one of the central port of main website is made as forwarding state, and another is made as blocked state.
Fig. 2 is a looped network off-state schematic diagram, and as shown in FIG., two central ports of main website all are in forwarding state.
1. main website agreement
As shown in Figure 3, main website has 4 kinds of states: initial state, and single connection status, the doubly-linked T-Ring opens state and the doubly-linked T-Ring closes state.In initial state, two central ports of switch all do not have to connect; In single connection status, switch has and only has a central port that connection is arranged; Open state and the doubly-linked T-Ring closes state at the doubly-linked T-Ring, all there is connection two central ports of switch, but the state on whole loop chain road is respectively and disconnects and closed.
The main website state can be changed mutually, and the main website state exchange receives incident controls such as protocol massages and timer expiry by our station central port state variation, concrete state machine transfer process such as following table:
| Numbering | Current state | Incident=〉 action | NextState |
| ??1 | Initial | The central port disconnect or receive LinkUp or LinkDown message or Test message overtime=attonity | Initial |
| ??2 | Initial | The central port connects=〉 this central port state is made as forwarding; Send the Test message to two central ports | The single connection |
| ??3 | The single connection | The central port disconnects=〉 this central port state is made as obstruction | Initial |
| ??4 | The single connection | Receive LinkUp or LinkDown message=quicken to send the Test messages to two central ports | The single connection |
| ??5 | The single connection | Receive the Test message=send the Test messages to two central ports | The doubly-linked T-Ring closes |
| ??6 | The single connection | Another central port connection=〉 send the Test messages to two central ports | The doubly-linked T-Ring closes |
| ??7 | The doubly-linked T-Ring closes | Receive the LinkUp message=send the TopologyChange messages to two central ports | The doubly-linked T-Ring closes |
| ??8 | The doubly-linked T-Ring closes | The Test message is overtime=〉 a central port state is made as obstruction; Send the TopologyChange message to two central ports; Send the Test message to two central ports | The doubly-linked T-Ring is opened |
| Numbering | Current state | Incident=〉 action | NextState |
| ??9 | The doubly-linked T-Ring closes | Receive the LinkDown message=a central port state is made as forwarding; Send the TopologyChange message to two central ports | The doubly-linked T-Ring is opened |
| ??10 | The doubly-linked T-Ring closes | The central port disconnection of blocked state=〉 attonity | The single connection |
| ??11 | The doubly-linked T-Ring closes | The central port of forwarding state disconnects=〉 the central port state of former forwarding state is made as obstruction; The central port state of former blocked state is made as forwarding; Send the TopologyChange message to two central ports; Send the Test message to two central ports | The single connection |
| ??12 | The doubly-linked T-Ring is opened | Receive the Test message=a central port state is made as obstruction; Send the TopologyChange message to two central ports; Send the Test message to two central ports | The doubly-linked T-Ring closes |
| ??13 | The doubly-linked T-Ring is opened | Receive LinkUp or LinkDown message=quicken to send the Test messages to two central ports | The doubly-linked T-Ring is opened |
| ??14 | The doubly-linked T-Ring is opened | The central port disconnects=〉 this central port state is made as obstruction; Send the TopologyChange message to two central ports; Send the Test message to two central ports | The single connection |
2. slave station agreement
Slave station has 5 kinds of states: initial state, single stable state that connects, single transient state, dual link stable state and dual link transient state of connecting.In initial state, two central ports of switch all do not have to connect; Be connected transient state in single stable state that connects with single, switch has and only has a central port that connection is arranged; In dual link stable state and dual link transient state, all there is connection two central ports of switch.
As shown in Figure 4, the slave station state can be changed mutually, and the slave station state exchange receives incident controls such as protocol massages and timer expiry by our station central port state variation, concrete state machine transfer process such as following table.
| Numbering | Current state | Incident=〉 action | NextState |
| ??1 | Initial | The central port disconnect or receive the TopologyChange message=attonity | Initial |
| ??2 | Initial | The central port connects=〉 this central port state is made as forwarding | Single stable state that connects |
| ??3 | Single stable state that connects | The central port disconnects=〉 this central port state is made as obstruction | Initial |
| ??4 | Single stable state that connects | Another central port connection=〉 startup connection timer; Send the LinkUp message | Dual link transient state |
| ??5 | Single stable state that connects | Receive the TopologyChange message=empty mac address forwarding table | Single stable state that connects |
| ??6 | Single transient state that connects | The central port connects or another central port disconnects=〉 attonity | Single transient state that connects |
| ??7 | Single transient state that connects | Disconnect timer expiry=stop to disconnect timer | Single stable state that connects |
| ??8 | Single transient state that connects | Receive the TopologyChange message=stop to disconnect timer and empty mac address forwarding table | Single stable state that connects |
| ??9 | Single transient state that connects | The central port disconnects=〉 this central port state is made as obstruction; Stop to disconnect timer | Initial |
| Numbering | Current state | Incident=〉 action | NextState |
| ??10 | Single transient state that connects | Another central port connects=〉 stop to disconnect timer; Start and connect timer; Send the LinkUp message | Dual link transient state |
| ??11 | The dual link stable state | Receive the TopologyChange message=empty mac address forwarding table | The dual link stable state |
| ??12 | The dual link stable state | The central port disconnects=〉 this central port state is made as obstruction; Start and disconnect timer; Send the LinkDown message | Single transient state that connects |
| ??13 | Dual link transient state | The central port connection=〉 attonity | Dual link transient state |
| ??14 | Dual link transient state | Connect timer expiry=the central port state of former blocked state is made as forwarding; Stop to connect timer | The dual link stable state |
| ??15 | Dual link transient state | Receive the TopologyChange message=the central port state of former blocked state is made as forwarding; Stop to connect timer; Empty mac address forwarding table | The dual link stable state |
| ??16 | Dual link transient state | The central port disconnects=〉 this central port state is made as obstruction; Stop to connect timer; Start and disconnect timer; Send the LinkDown message | Single transient state that connects |
Claims (3)
1. an Ethernet is realized the method for looped network redundancy and network recovery, form the Ethernet ring l network by a plurality of switches, switch connects into ring physically, it logically is chain structure, it is characterized in that: have and only have one in the described switch and be set to main website, main website is responsible for the Control Network logical construction, and other are set to slave station, switch realization looped network redundancy link backup by each switch central port state, existing network network method redundant and that recover is as follows in fact:
1. main website and each slave station all have two central ports, and each central port all can be set to forwarding state or blocked state, transmit all Ethernet messages under the forwarding state; Do not transmit the general service message under the blocked state, only transmit preset link detection messages, topology changed messages, link failure message and link-recovery message;
2. main website working method: main website periodically sends link detection message to two central ports respectively with the default time interval, if link detection message can be received by main website before overtime, illustrate that then the loop chain road is in closure state, one of the central port of main website is made as forwarding state, and another is made as blocked state; If link detection message is not received by main website in Preset Time, illustrate that then the loop chain road is in off-state, two central ports of main website all are made as forwarding state;
3. slave station working method: if slave station detects this machine central port link failure or link-recovery, then reset the central port state, and send link failure messages or link-recovery message to two central ports respectively; If receive link failure message, link-recovery message, link detection message or topology changed messages, then transmit to another central port from standing in a central port;
4. main website and slave station interactive mode: if link failure message or link-recovery message that slave station sends are received by main website, then quicken link detecting, promptly reduce to send the time interval of link detection message; Line state changes if main website detects loop chain, then resets the central port state, empties mac address forwarding table, and sends topology changed messages notice slave station to two central ports respectively; If slave station is received the topology changed messages that main website sends, then reset the central port state, and empty mac address forwarding table.
2. Ethernet according to claim 1 is realized the method for looped network redundancy and network recovery, it is characterized in that: also comprise when guaranteeing link failure recovery the network method of Cheng Huan not logically: when the network uplink takes place to interrupt, be made as blocked state with these link-attached two slave station central ports, send link failure message notifying main website, main website is made as forwarding state with the former central port that is in blocked state after receiving the link failure message; When the fault recovery of network uplink, send link-recovery message notifying main website earlier with these link-attached two slave stations, main website is made as blocked state with a central port detecting under the ring situation of closing, and sending topology changed messages notice slave station, slave station is made as forwarding state with the former central port that is in blocked state after receiving topology changed messages again.
3. Ethernet according to claim 1 and 2 is realized the method for looped network redundancy and network recovery, it is characterized in that: also comprise the method that improves the agreement robustness: for fear of the uncertainty that causes the agreement sequential when the link loose contact, two transient state are set in slave station, single transient state and dual link transient state of connecting, the i.e. transient state of transient state when having only a central port to connect when all being connected corresponding to two central ports; Connect when slave station has only central port, and detect another central port and just connect, then be introduced into dual link transient state, start and connect timer, reach the dual link stable state again after timer expiry or slave station are received topology changed messages connecting; When two central ports of slave station all connect, and detect a central port and just disconnect, then be introduced into single transient state that connects, start and disconnect timer, reach single stable state that connects after timer expiry or slave station are received topology changed messages again disconnecting.
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