CN101534211A - Network convergence method, network bridges and system - Google Patents
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- CN101534211A CN101534211A CN200810101861A CN200810101861A CN101534211A CN 101534211 A CN101534211 A CN 101534211A CN 200810101861 A CN200810101861 A CN 200810101861A CN 200810101861 A CN200810101861 A CN 200810101861A CN 101534211 A CN101534211 A CN 101534211A
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Abstract
The invention discloses a network convergence method, network bridges and a system belonging to the technical field of communication. The method comprises the steps that: when network topology changes, the first network bridge receives a negotiation BPDU message which is sent from a designated port of the network bridge through a backup port; judgment on whether the preset mark is the BPDU message allowed to be sent or not is made, if so, the first network bridge replies a response BPDU message through the backup port according to the type of a current spanning tree protocol; and when the response BPDU message is received by the designated port, the state of the port is set to be the forwarding state. The network bridges comprise receiving modules, processing modules and setting modules. The system comprises the first network bridge, the second network bridge and the third network bridge. The invention realizes the P/A negotiation with the backup port under the spanning tree protocol, achieves the purpose of rapid conversion of the port state, shortens the convergence time and raises the speed of network convergence.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method of network convergence, bridge and system.
Background technology
STP (Spanning Tree Protocol, Spanning-Tree Protocol) belongs to the management agreement of data link layer, can be applicable to exist the local area network (LAN) of loop, by blocking network redundant link selectively, network is trimmed to tree-shaped, reach the purpose of cancellation loop, possess the link backup function simultaneously.RSTP (Rapid Spanning Tree Protocol, RSTP) is the optimization version of STP, its measure by multinomial improvement to be to reach the topology purpose of convergence fast, comprising P (Proposal)/A (Agreement) negotiation mechanism with increase by two kinds of port roles: Alternate port blocked (being the backup port of root port) and Backup backup port (backup port of designated port).MSTP (Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol) is the optimization version of RSTP, it is by the example mapping mechanism, with VLAN (Virtual Local Area Network, VLAN) is mapped in the different examples, because a territory can comprise one or more examples, therefore can in each territory, form many and generate tree.Each generates tree and does not disturb mutually, thereby can reach the intercommunication of data in VLAN and the purpose of load balancing.Compatible STP of MSTP and RSTP.
STP, RSTP and MSTP all exchange the information of each bridge by BPDU (Bridge Protocol Data Unit, bridge protocol data unit) message, thereby determine topology of networks.In RSTP and MSTP, include sign (Flag) field in the BPDU message, referring to Fig. 1, the length of this attribute field is 1 byte, wherein, 4 bits of the 7th bit to the are represented following flag information: TCA (Topology Change Acknowledgement respectively, change in topology is replied), Agreement (replying), Forwarding (forwarding), Learning (study), the 3rd and the 2nd bit are represented Port role (port role) jointly, the 1st and the 0th bit are represented respectively: Proposal (negotiation) and TC (Topology Change, change in topology).
The P/A negotiation of RSTP and MSTP is to finish by Proposal and these two flag bits of Agreement of BPDU message.Under the RSTP pattern, the port of holding consultation is replied the BPDU message of the Agreement set of a correspondence after receiving the BPDU message of Proposal set; Under the MSTP pattern, the port of holding consultation after receiving the BPDU message of Proposal set, receive the BPDU message of an Agreement set again after, just reply the BPDU message of the Agreement set of a correspondence.Wherein, the BPDU message of Proposal set can abbreviate as consults the BPDU message, and the BPDU message of Agreement set can abbreviate as replys the BPDU message.Referring to Fig. 2, bridge has a root port A (the port role flag bit is 0x10), and it is as follows that two designated port B and C (the port role flag bit is 0x11), the P/A of RSTP pattern consult flow process:
1. the root port A of bridge receives and consults the BPDU message;
2. the state of designated port B is the Block blocked state;
3. the state of designated port C is a blocked state;
4. root port A sends and replys the BPDU message;
5. the state with root port A is changed to forwarding state (promptly the 5th bit set of the attribute field of BPDU message);
6. designated port B sends and consults the BPDU message;
7. designated port C sends and consults the BPDU message;
8. receive from designated port B and reply the BPDU message;
9. the state with designated port B is changed to forwarding state;
10. receive from designated port C and reply the BPDU message;
11. the state of designated port C is changed to forwarding state.
In the prior art, after network topology changes, a port of bridge is initiated P/A and is consulted under the Block state, send negotiation BPDU message to another port, and beginning timer timing, if that receives in the forward delay time of a regulation (Forwarding delay time) that another port sends replys the BPDU message, then the state of the port becomes forwarding state immediately, begins to transmit data message; Otherwise the port transfers learning state to, begins to learn the mac information of the data message that another port sends, but does not transmit this data message.In next forward delay time, if having received, the port replys the BPDU message, then the state of the port also becomes forwarding state immediately, begins to transmit data message; Otherwise, wait until current forward delay time overtime after, the state of the port becomes forwarding state immediately, begins to transmit data message.
After prior art was analyzed, the inventor found:
When having the Backup port in two ports that carry out the P/A negotiation, because the state of Backup port remains the discarding state, can not outwards send any BPDU message, therefore can't finish P/A consults, and, if receiving all the time, the port of initiating to consult do not reply the BPDU message, then transfer learning state to from blocked state, transfer forwarding state again to, whole convergence process needs the forward delay time of twice, the time of convergence is longer, and the time that data traffic is interrupted on the link at two port places of promptly holding consultation is longer.
Summary of the invention
In order to improve the speed of network convergence, the embodiment of the invention provides a kind of method, bridge and system of network convergence.Described technical scheme is as follows:
On the one hand, the embodiment of the invention provides a kind of method of network convergence, is applied to first bridge, and described method comprises:
When network topology changed, described first bridge received the conference bridge protocol Data Unit BPDU message of sending from the designated port of described first bridge by backup port;
Described first bridge judges whether default sign is to allow to send the BPDU message, if the type of the Spanning-Tree Protocol of using according to described first bridge is then replied by described backup port and to be replied the BPDU message;
After described first bridge was received the described BPDU of replying message by described designated port, the state of described designated port was set to forwarding state.
On the other hand, the embodiment of the invention also provides a kind of bridge, and described bridge comprises:
Receiver module is used for when network topology changes, and receives the negotiation BPDU message of sending from the designated port of described bridge by backup port;
Processing module, be used for after described receiver module is received described negotiation BPDU message, judge whether default sign is to allow to send the BPDU message, if, the type of the Spanning-Tree Protocol of using according to described bridge is then replied by described backup port and to be replied the BPDU message;
Module is set, is used for after described bridge is received the described BPDU of replying message by described designated port, the state of described designated port is set to forwarding state.
On the other hand, the embodiment of the invention also provides a kind of system of network convergence, and described system comprises first bridge, second bridge and the 3rd bridge; Described first bridge links to each other with the 3rd bridge with described second bridge of network respectively in dual-homed mode;
Described second bridge and the 3rd bridge are used to set up the BPDU tunnel that comprises described second bridge and the 3rd bridge at least, and are configured and make described BPDU tunnel transparent transmission BPDU message;
Described first bridge is used for when network topology changes, and receives the negotiation BPDU message of sending by described BPDU tunnel from the designated port of described first bridge by backup port; Judge whether default sign is to allow to send the BPDU message, if, reply by described backup port and to reply the BPDU message then according to the type of the Spanning-Tree Protocol of current use; After receiving the described BPDU of replying message by described designated port from described BPDU tunnel, the state of described designated port is set to forwarding state.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
By being set, sign make the Backup port send the BPDU message, thereby finishing the P/A that carries out under the Spanning-Tree Protocol with designated port consults, after designated port is received and is replied the BPDU message, port is set to forwarding state, reached the port status purpose of conversion fast, shorten the time of convergence, improved the speed of network convergence.
Description of drawings
Fig. 1 is the form schematic diagram of attribute field in the BPDU message in the prior art;
Fig. 2 is that the P/A of RSTP pattern in the prior art consults schematic flow sheet;
Fig. 3 is the method flow diagram of the network convergence that provides of the embodiment of the invention 1;
Fig. 4 is the dual-homing networking schematic diagram that the embodiment of the invention 1 provides;
Fig. 5 is the bridge structure chart that the embodiment of the invention 2 provides;
Fig. 6 is the system construction drawing of the network convergence that provides of the embodiment of the invention 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The method of the network convergence that the embodiment of the invention provides is applied to bridge, specifically comprises: when network topology changed, this bridge received the negotiation BPDU message of sending from the designated port of this bridge by backup port; This bridge judges whether default sign is to allow to send the BPDU message, if the type of the Spanning-Tree Protocol of using according to this bridge is then replied by backup port and to be replied the BPDU message; This bridge by designated port receive reply the BPDU message after, the state of designated port is set to forwarding state.
Bridge in the embodiment of the invention can be used RSTP, perhaps uses MSTP, also can use RSTP and MSTP simultaneously.
Referring to Fig. 3, the embodiment of the invention provides a kind of method of network convergence, is applied to bridge, for convenience, is designated as first bridge in the present embodiment, and this method specifically comprises:
Bridge was preset sign in this locality in 301: the first, was used for being provided with the backup Backup port that whether allows first bridge and sent the BPDU message.Wherein, default sign has multiple mode, as can on first bridge, disposing a marking variable Flag, be kept in the internal memory, and stipulate that the value of this marking variable Flag has two kinds, " 1 " and " 0 ", if marking variable Flag=1 is set, then expression allows the Backup port to send the BPDU message, if marking variable Flag=0 is set, then existing standard agreement is followed in expression, does not allow the Backup port to send the BPDU message.When initialization, the value of this marking variable can be set according to actual conditions, be set to 1 in the present embodiment.
302: when network topology changes, calculate by Spanning-Tree Protocol, select designated port and Backup port on first bridge, first bridge receives the negotiation BPDU message of sending from the designated port of first bridge by the Backup port.
Further, after first bridge is received and is consulted the BPDU message, can also be at this emptying forwarding-table item, as MAC (MediaAccess Control, medium access control) table, ARP (Address Resolution Protocol, address resolution protocol) table or the like, thus make first bridge can relearn forwarding information, set up new forwarding-table item.
303: the first bridges judge whether default sign is to allow to send the BPDU message, if then carry out 304; Otherwise, carry out 306.
304: the first bridges are according to the type of the Spanning-Tree Protocol of current use, reply by the Backup port and reply the BPDU message.
Particularly, first bridge can be judged the type of the Spanning-Tree Protocol of current use, if be RSTP, then first bridge is replied by the Backup port and replied the BPDU message; If be MSTP, then first bridge from the Backup port receive one reply the BPDU message after, reply by the Backup port and to reply the BPDU message.
305: the first bridges by designated port receive reply the BPDU message after, the state of designated port is set to forwarding state, begins to transmit data message, finishes then.
306: handle according to existing procedure, promptly first bridge does not send by the Backup port and replys the BPDU message, finishes then.
Referring to Fig. 4, for the technical scheme in the embodiment of the invention is applied in schematic diagram under the dual-homing networking environment.The first bridge C is arranged in enterprise network, link to each other with the 3rd bridge B with the second bridge A of metropolitan area network respectively in dual-homed mode, under this network environment, need set up the BPDU tunnel earlier, this BPDU tunnel comprises the second bridge A and the 3rd bridge B at least, and this BPDU tunnel is configured to transparent transmission BPDU message, and local MSTP/RSTP network has been formed in the first bridge C and BPDU tunnel.Wherein, transparent transmission BPDU message is meant in this BPDU tunnel, the BPDU message not can by the Spanning-Tree Protocol of equipment of process analyze, but directly by this device forwards.
Wherein, there is multiple implementation in the BPDU tunnel of setting up transparent transmission BPDU message, be connected with the port GE3/0/2 of B as the GE2/0/2 port of A among Fig. 4, the BPDU message that C sends be 10 with the VLAN label of TAG, when then between A and B, setting up the BPDU tunnel, can dispose as follows respectively:
1) dispose on A: port GE2/0/1 and GE2/0/2 forwarding VLAN label are 10 BPDU message, and two ports all enable the BPDU tunnelling function;
2) dispose on B: port GE3/0/1 and GE3/0/2 forwarding VLAN label are 10 BPDU message, and two ports all enable the BPDU tunnelling function;
Concrete layoutprocedure is a prior art, repeats no more herein.
By BPDU tunnel transparent transmission BPDU message, make the BPDU message of the port transmission of the bridge C that wins, can be received by another port of this bridge.Designated port GE1/0/1 as the first bridge C sends negotiation BPDU message, after the BPDU tunnel transmission, is received by the Backup port GE1/0/2 of the first bridge C, consults thereby begin to carry out P/A.After two port negotiation successes of the first bridge C, calculate by Spanning-Tree Protocol, C will block one of them port, thereby is implemented in cancellation loop in the local MSTP/RSTP network.In addition, in two ports of the first bridge C carry out process that P/A consults, after the second bridge A or the 3rd bridge B receive and reply the BPDU message, all at this emptying forwarding-table item (as MAC table, ARP table), thereby make local device can relearn forwarding information, set up new forwarding-table item.
Present embodiment makes the Backup port send the BPDU message by sign is set, thereby finishing the P/A that carries out under the Spanning-Tree Protocol with designated port consults, after designated port is received and is replied the BPDU message, port is set to forwarding state, reached the port status purpose of conversion fast, convergence time can reach 1 second with interior (actual convergence time is relevant with the performance and the length in BPDU tunnel), need not the forward delay time that equipment is waited for twice, shorten the time of convergence, improved the speed of network convergence.
Referring to Fig. 5, the embodiment of the invention also provides a kind of bridge, specifically comprises:
Receiver module is used for when network topology changes, and receives the negotiation BPDU message of sending from the designated port of bridge by backup port;
Processing module is used for after receiver module receives to consult the BPDU message, judges whether default sign is to allow to send the BPDU message, if the type of the Spanning-Tree Protocol of using according to bridge is then replied by backup port and to be replied the BPDU message;
Module is set, is used for when bridge receives to reply the BPDU message by designated port after, the state of designated port is set to forwarding state.
Wherein, processing module specifically comprises:
First judging unit is used for after receiver module receives to consult the BPDU message, judges whether default sign is to allow to send the BPDU message;
First processing unit is used for going out to be designated allow to send the BPDU message when first judgment unit judges, and the type of the Spanning-Tree Protocol used of bridge is replied the BPDU message by the backup port answer during as RSTP.
Perhaps, processing module specifically comprises:
Second judging unit is used for after receiver module receives to consult the BPDU message, judges whether default sign is to allow to send the BPDU message;
Second processing unit, be used for allowing to send the BPDU message when second judgment unit judges goes out to be designated, and the type of the Spanning-Tree Protocol that bridge uses is during as Multiple Spanning Tree Protocol, from backup port receive one reply the BPDU message after, reply by backup port and to reply the BPDU message.
When above-mentioned bridge was used RSTP and MSTP simultaneously, processing module can comprise first processing unit and second processing unit simultaneously.
Further, above-mentioned bridge also comprises:
Empty module, be used for after receiver module is received negotiation BPDU message, at this emptying forwarding-table item.
Bridge in the present embodiment makes the Backup port send the BPDU message by sign is set, thereby finishing the P/A that carries out under the Spanning-Tree Protocol with designated port consults, after designated port is received and is replied the BPDU message, port is set to forwarding state, reached the port status purpose of conversion fast, convergence time can reach 1 second with interior (actual convergence time is relevant with the performance and the length in BPDU tunnel), the equipment that need not is waited for the forward delay time of twice, shorten the time of convergence, improved the speed of network convergence.
Referring to Fig. 6, the embodiment of the invention also provides a kind of system of network convergence, comprises first bridge, second bridge and the 3rd bridge; First bridge links to each other with the 3rd bridge with second bridge of network respectively in dual-homed mode;
Second bridge and the 3rd bridge are used to set up the BPDU tunnel that comprises second bridge and the 3rd bridge at least, and are configured and make BPDU tunnel transparent transmission BPDU message;
First bridge is used for when network topology changes, and receives the negotiation BPDU message of sending by the BPDU tunnel from the designated port of first bridge by backup port; Judge whether default sign is to allow to send the BPDU message, if, reply by backup port and to reply the BPDU message then according to the type of the Spanning-Tree Protocol of current use; When receive from the BPDU tunnel by designated port reply the BPDU message after, the state of designated port is set to forwarding state.
Present embodiment is provided with the BPDU tunnel transmission BPDU message that sign makes the Backup port set up by second bridge and the 3rd bridge by first bridge, thereby finishing the P/A that carries out under the Spanning-Tree Protocol with designated port consults, after designated port is received and is replied the BPDU message, port is set to forwarding state, reached the port status purpose of conversion fast, convergence time can reach 1 second with interior (actual convergence time is relevant with the performance and the length in BPDU tunnel), the equipment that need not is waited for the forward delay time of twice, shorten the time of convergence, improved the speed of network convergence.
The embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in the hard disk of bridge, buffer memory or the CD.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method for a network convergence is applied to first bridge, it is characterized in that, described method comprises:
When network topology changed, described first bridge received the conference bridge protocol Data Unit BPDU message of sending from the designated port of described first bridge by backup port;
Described first bridge judges whether default sign is to allow to send the BPDU message, if the type of the Spanning-Tree Protocol of using according to described first bridge is then replied by described backup port and to be replied the BPDU message;
After described first bridge was received the described BPDU of replying message by described designated port, the state of described designated port was set to forwarding state.
2. the method for network convergence according to claim 1, it is characterized in that, described first bridge links to each other with the 3rd bridge with second bridge of network respectively in dual-homed mode, described first bridge receives described negotiation BPDU message and replys the described BPDU message of replying by the BPDU tunnel of setting up in advance, described BPDU tunnel comprises described second bridge and the 3rd bridge at least, and described BPDU tunnel is configured to transparent transmission BPDU message.
3. the method for network convergence according to claim 1 is characterized in that, the type of the described Spanning-Tree Protocol of using according to described first bridge is replied by described backup port and to be replied the BPDU message, specifically comprises:
The type of the Spanning-Tree Protocol of using when described first bridge is during as RSTP, replys by described backup port and replys the BPDU message.
4. the method for network convergence according to claim 1 is characterized in that, the type of the described Spanning-Tree Protocol of using according to described first bridge is replied by described backup port and to be replied the BPDU message, specifically comprises:
The type of the Spanning-Tree Protocol of using when described first bridge is during as Multiple Spanning Tree Protocol, from described backup port receive one reply the BPDU message after, reply by described backup port and to reply the BPDU message.
5. the method for network convergence according to claim 1 is characterized in that, described first bridge receives after the conference bridge protocol Data Unit BPDU message that the designated port of described first bridge is sent by backup port, also comprises:
Described first bridge is at this emptying forwarding-table item.
6. the method for network convergence according to claim 2 is characterized in that, described first bridge is received before the described BPDU of the replying message by described designated port, also comprised:
Described second bridge or the 3rd bridge are received the described BPDU of replying message, at this emptying forwarding-table item.
7. a bridge is characterized in that, described bridge comprises:
Receiver module is used for when network topology changes, and receives the conference bridge protocol Data Unit BPDU message of sending from the designated port of described bridge by backup port;
Processing module, be used for after described receiver module is received described negotiation BPDU message, judge whether default sign is to allow to send the BPDU message, if, the type of the Spanning-Tree Protocol of using according to described bridge is then replied by described backup port and to be replied the BPDU message;
Module is set, is used for after described bridge is received the described BPDU of replying message by described designated port, the state of described designated port is set to forwarding state.
8. bridge according to claim 7 is characterized in that, described processing module specifically comprises:
First judging unit is used for after described receiver module is received described negotiation BPDU message, judges whether default sign is to allow to send the BPDU message;
First processing unit is used for allow sending the BPDU message when described first judgment unit judges goes out described being designated, and the type of the Spanning-Tree Protocol used of described bridge is replied the BPDU message by described backup port answer during as RSTP.
9. bridge according to claim 7 is characterized in that, described processing module specifically comprises:
Second judging unit is used for after described receiver module is received described negotiation BPDU message, judges whether default sign is to allow to send the BPDU message;
Second processing unit, be used for allowing to send the BPDU message when described second judgment unit judges goes out described being designated, and the type of the Spanning-Tree Protocol that described bridge uses is during as Multiple Spanning Tree Protocol, from described backup port receive one reply the BPDU message after, reply by described backup port and to reply the BPDU message.
10. bridge according to claim 7 is characterized in that, described bridge also comprises:
Empty module, be used for after described receiver module is received described negotiation BPDU message, at this emptying forwarding-table item.
11. the system of a network convergence is characterized in that, described system comprises first bridge, second bridge and the 3rd bridge; Described first bridge links to each other with the 3rd bridge with described second bridge of network respectively in dual-homed mode;
Described second bridge and the 3rd bridge are used to set up the BPDU tunnel that comprises described second bridge and the 3rd bridge at least, and are configured and make described BPDU tunnel transparent transmission BPDU message;
Described first bridge is used for when network topology changes, and receives the negotiation BPDU message of sending by described BPDU tunnel from the designated port of described first bridge by backup port; Judge whether default sign is to allow to send the BPDU message, if, reply by described backup port and to reply the BPDU message then according to the type of the Spanning-Tree Protocol of current use; After receiving the described BPDU of replying message by described designated port from described BPDU tunnel, the state of described designated port is set to forwarding state.
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| CN102571520A (en) * | 2011-12-31 | 2012-07-11 | 北京格林伟迪科技有限公司 | Method for realizing rapid convergence in looped network |
| CN102821050A (en) * | 2012-08-15 | 2012-12-12 | 南京南瑞继保电气有限公司 | Processing method for applying rapid spanning tree protocol to monocyclic network topology |
| CN108055215A (en) * | 2017-12-26 | 2018-05-18 | 新华三技术有限公司 | Message forwarding method and device |
| CN111478778A (en) * | 2020-04-03 | 2020-07-31 | 中电科航空电子有限公司 | Method for reducing RSTP looped network power consumption and application thereof |
| CN113395261A (en) * | 2021-05-19 | 2021-09-14 | 浪潮思科网络科技有限公司 | Method, equipment and medium for spanning tree protocol fast convergence in MLAG environment |
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| CN100499661C (en) * | 2006-01-11 | 2009-06-10 | 杭州华三通信技术有限公司 | Port state shift method |
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| CN101060485B (en) * | 2007-05-11 | 2011-08-10 | 杭州华三通信技术有限公司 | Topology changed messages processing method and processing device |
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| CN102571520A (en) * | 2011-12-31 | 2012-07-11 | 北京格林伟迪科技有限公司 | Method for realizing rapid convergence in looped network |
| CN102571520B (en) * | 2011-12-31 | 2015-10-28 | 北京格林伟迪科技有限公司 | A kind of method realizing Fast Convergent in looped network |
| CN102821050A (en) * | 2012-08-15 | 2012-12-12 | 南京南瑞继保电气有限公司 | Processing method for applying rapid spanning tree protocol to monocyclic network topology |
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| CN111478778B (en) * | 2020-04-03 | 2021-11-02 | 中电科航空电子有限公司 | Method for reducing RSTP looped network power consumption and application thereof |
| CN113395261A (en) * | 2021-05-19 | 2021-09-14 | 浪潮思科网络科技有限公司 | Method, equipment and medium for spanning tree protocol fast convergence in MLAG environment |
| CN114978939A (en) * | 2022-06-10 | 2022-08-30 | 中煤科工重庆设计研究院(集团)有限公司 | Method for detecting network link quality |
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