CN1980224A - Method and system for recovering business after apparatus state switching-over based on main and spare netgate - Google Patents
Method and system for recovering business after apparatus state switching-over based on main and spare netgate Download PDFInfo
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- CN1980224A CN1980224A CN 200510102085 CN200510102085A CN1980224A CN 1980224 A CN1980224 A CN 1980224A CN 200510102085 CN200510102085 CN 200510102085 CN 200510102085 A CN200510102085 A CN 200510102085A CN 1980224 A CN1980224 A CN 1980224A
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- host apparatus
- subscriber equipment
- bgp
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/56—Routing software
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Kernel of the invention is that when connection in BGP protocol built between user device and gateway device, gateway device uses VRRP virtual address as source address in BGP protocol. After main and standby states of the gateway device are switched, using GR mode, the new main device of gateway builds connection in BGP protocol with user device in order to guarantee to build protocol connection between user device and gateway device smoothly. Under condition of building BGP protocol neighbor between user device and gateway device, when switching main device of gateway, the invention uses GR mode shortens service interruption time effectively so as to meet user's requirement on network reliability.
Description
Technical field
The present invention relates to the communications field, especially relate to a kind of method and system based on active/standby gateway apparatus state resuming service after switching.
Background technology
Along with development of internet technology, the user improves day by day to the requirement of network reliability, and subscriber equipment all requires to insert two gateways usually, moves virtual redundant routing protocol (Virtual RouterRedundancy Protocol between the gateway; VRRP), so that gateway device to switch subscriber equipment be transparent.Under some scene, subscriber equipment is three-layer equipments such as router, it and allow to move bgp protocol, mutual each other route between the gateway device of VRRP agreement.Under this application scenarios, if the host apparatus fault causes the gateway device state to switch, subscriber equipment need remove and previous gateway host apparatus between Border Gateway Protocol (the Border Gateway Protocol that sets up; BGP) neighborhood, set up the neighborhood of bgp protocol again with new gateway host apparatus, the process that this forwarding-table item deletion earlier that wherein certainly exists a bgp protocol generation is created again, to cause the long period service disconnection of (several seconds, tens seconds even tens seconds), be difficult to satisfy the requirement of client network reliability.
In the existing network system, gateway device does not use the VRRP function, using the interface of gateway device or loop-back address to set up bgp protocol between subscriber equipment and the two gateway devices is connected, subscriber equipment utilizes the optimization technique of bgp protocol self to select a gateway device as the up outlet of business, when selected gateway device breaks down, subscriber equipment utilizes its fault of convergence technology perception of bgp protocol self again, selects the another one gateway device as the up outlet of business.In the prior art, when the subscriber equipment perception main with gateway device failure and during will pointing to main forwarding-table item and being modified as the sensing standby gateway with gateway device, business is interrupted, when this forwarding quantity is more, its service outage duration is still long, is difficult to satisfy the requirement of user to network reliability.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method based on active/standby gateway apparatus state resuming service after switching.Under the active and standby situation about switching of gateway, by Graceful Restart (Graceful Restart with equipment; GR) mode reaches and is setting up being connected of bgp protocol between new gateway host apparatus and the subscriber equipment under the situation that does not cause service disconnection.
The invention provides a kind of method, it is characterized in that, comprise the steps: based on active/standby gateway apparatus state resuming service after switching
A. set up Border Gateway Protocol (BGP) when being connected when between subscriber equipment and the gateway device, gateway device uses the source address of virtual redundant routing protocol (VRRP) virtual address as bgp protocol;
B. gateway device is active and standby switch with state after, new gateway host apparatus adopts the mode of Graceful Restart (GR) to set up Border Gateway Protocol (BGP) with subscriber equipment to be connected, the assurance subscriber equipment is set up agreement smoothly with new gateway host apparatus and is connected.
Described step B specifically comprises, increases the function that the GR technology is expanded bgp protocol in bgp protocol, makes between subscriber equipment and the gateway device and can realize the GR technology.
Described step B also comprises,
B1. after the gateway device state switched, the VRRP module in the new gateway host apparatus was switched the BGP module that message announcement is given gateway device with the gateway device state;
B2. after the BGP module of gateway device received that gateway device state that new gateway host apparatus sends switches message, it initiatively sent the connection request message of bgp protocol to the BGP of subscriber equipment module;
B3. the BGP module of subscriber equipment is handled described message according to the BGP connection request message of receiving according to the GR technology.
Described B2 comprises specifically that the BGP module of gateway device is set up to put in the message (OPEN) neighbours and restarts (Restart) mark, initiates the agreement connection request message with subscriber equipment.
After step B, also specifically comprise:
C. between new gateway host apparatus and previous gateway host apparatus, set up the IBGP agreement and connect, make new gateway host apparatus and previous gateway host apparatus that the route of subscriber equipment issue all be arranged;
D. after the gateway device state switches, new gateway host apparatus and previous gateway host apparatus are not initiatively deleted the route that previous gateway host apparatus is learnt from subscriber equipment, the described route of using new gateway host apparatus instructs the flow of returning from bearer network to be transmitted to subscriber equipment, does not interrupt to guarantee the business of returning subscriber equipment.
Described step D specifically comprises,
D1. in the new gateway host apparatus and the GR process of subscriber equipment, new gateway host apparatus can be acquired the route of previous gateway host apparatus directed towards user equipment again from subscriber equipment;
D2. new gateway host apparatus is given previous gateway host apparatus by the IBGP agreement with described routing forwarding, and previous gateway host apparatus keeps the described route received and deletes the corresponding route that it is directly acquired from subscriber equipment according to the described route of being received;
D3. after the GR of new gateway host apparatus and subscriber equipment finishes, new gateway host apparatus is deleted the route of all directed towards user equipment of acquiring from previous gateway host apparatus, finish to previous gateway host apparatus announcement GR with stylish gateway host apparatus, previous gateway host apparatus is deleted the route that all directly obtain from subscriber equipment again.
In step D3, described new gateway host apparatus finishes to previous gateway host apparatus announcement GR by expansion VRRP protocol massages.
Elongated for fear of the time that GR lost efficacy or GR recovers, the source port number of the connection that new gateway host apparatus is set up is different with the port numbers that previous gateway host apparatus connects.
When gateway host apparatus and subscriber equipment connected, the gateway host apparatus was announced it by expansion VRRP agreement to the gateway stand-by equipment and is set up the source port number of bgp neighbor use with subscriber equipment.
The present invention also provides a kind of system based on active/standby gateway apparatus state resuming service after switching, comprises that gateway device, subscriber equipment, BGP module, VRRP module, VRRP switch sensing module and switching notice module,
Move virtual redundant routing protocol by the VRRP module between the described gateway device;
Described gateway device and subscriber equipment all dispose Graceful Restart (GR) technology, and set up the Border Gateway Protocol connection by the BGP module;
Described switching notice module is used to announce gateway device state switching message and switches sensing module to VRRP:
Described VRRP switches sensing module and switches message to the BGP of subscriber equipment module initiation bgp protocol connection request message according to the gateway device state of being received;
The BGP module of described subscriber equipment is carried out Graceful Restart (GR) according to the bgp protocol connection request message of being received.
Described switching notice module is embedded in the VRRP inside modules.
Described VRRP switches the BGP inside modules that sensing module is embedded in gateway device.
Description of drawings
Fig. 1 is a basic networking plan schematic diagram of the present invention;
Fig. 2 is a method flow diagram of the present invention;
Fig. 3 is the system schematic of one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is a basic networking plan schematic diagram of the present invention, referring to Fig. 1, supposes that gateway A is default gateway host apparatus, and gateway B is a stand-by equipment, and the signaling of gateway is in gateway A---carries on the link between switch A---switch b---the gateway B.
The active and standby switching with equipment generation state of gateway comprises following situation, and A. is when the gateway A device fails, and gateway B detects the gateway A fault by VRRP signaling or other modes, switches to the gateway host apparatus; B. the priority between gateway A and the gateway B is overturn, and gateway B is configured to contention mode, and gateway B initiatively switches to the gateway host apparatus; C. revise the configuration of gateway A, away from the gateway backup group, gateway B receives and initiatively switches to the gateway host apparatus after the corresponding signaling message;
When gateway is active and standby switch with state after, the invention provides a kind of method based on active/standby gateway apparatus state resuming service after switching, core of the present invention is under the active and standby situation about switching with equipment of gateway, by the mode of GR, reach and setting up being connected of bgp protocol between new gateway host apparatus and the subscriber equipment under the situation that does not cause service disconnection.
Concrete technical scheme of the present invention is as follows, comprising: gateway device, subscriber equipment, BGP module and VRRP module.Move virtual redundant routing protocol between the described gateway device; Described gateway device and subscriber equipment all dispose Graceful Restart (GR) technology; The source address that described gateway device uses the VRRP virtual address to connect as bgp protocol; Described subscriber equipment uses the VRRP virtual address as bgp protocol purpose of connecting address;
The binding relationship of on gateway device, (comprise host apparatus and stand-by equipment) configuration VRRP agreement and bgp protocol, message interaction between these agreements and the appointment neighbours (subscriber equipment) is subjected to the influence of the gateway device state of its binding, make have only that the gateway host apparatus can normally receive, the protocol massages between transmission and the subscriber equipment, the gateway stand-by equipment then neither receives and does not also send such message, like this, the gateway host apparatus just can be set up normal agreement neighbours with subscriber equipment, and the gateway stand-by equipment then can't be set up this neighborhood.Angle from subscriber equipment, it and the agreement neighbours that are indifferent to it are gateway A or gateway B, the neighbours address of its bgp protocol is gateway address (VRRP virtual address), correspondingly, the next hop address of the forwarding-table item that these agreements generate also is gateway address (VRRP virtual address), transmitting a target MAC (Media Access Control) address of the message that guidance is transmitted by these is the MAC Address of VRRP virtual address correspondence, according to the principle of VRRP agreement, can only and carry out three layers of forwarding by the reception of gateway host apparatus;
When because previously described various reasons causes the gateway device state to switch, according to method provided by the invention, as shown in Figure 2,
Step 201, gateway device state switch;
For example, gateway A is previous gateway host apparatus, and after the gateway device state switched, gateway B upgraded to new gateway host apparatus.
Step 202, switching notice module gateway device generation state switch;
After the gateway device state switched, the switching notice module was switched message announcement with the gateway device state and is switched sensing module to VRRP;
As shown in Figure 3, the switching notice module can be embedded in the VRRP inside modules, and VRRP switches the BGP inside modules that sensing module can be embedded in gateway device.
Step 203, VRRP switch sensing module initiates bgp protocol connection request message to the BGP of subscriber equipment module;
According to the description of our front, gateway B equipment disposition the GR ability of BGP, the BGP module of gateway B is switched message with this gateway device state and is understood as a GR incident, initiatively initiates to be connected with the agreement of subscriber equipment; For example the BGP module is put into Restart (restarting) mark in OPEN (neighbours' foundation) message.
The BGP module of step 204, subscriber equipment is carried out Graceful Restart according to the connection request message of being received;
Because subscriber equipment has also disposed the GR ability of BGP, and it can not distinguish what connect with it from message be gateway A or gateway B, therefore, when the BGP of gateway device module is initiated new agreement connection, triggered the GR ability of subscriber equipment, like this, subscriber equipment just can with gateway B equipment level and smooth set up the agreement neighbours, and, set up in the process at bgp protocol, can not delete the forwarding item of having set up, the up business of assurance subscriber equipment can not interrupted;
In order to solve the long-time problem of returning from bearer network of interrupting of flow, method of the present invention is to set up IBGP neighbours between gateway host apparatus and gateway stand-by equipment, for example, the gateway host apparatus is a gateway A, and the gateway stand-by equipment is gateway B, like this, gateway A will be transmitted the route of learning from subscriber equipment to gateway B, and its next hop address is set to not revise, still directed towards user equipment, like this, gateway B goes up the route that the subscriber equipment issue is just arranged equally.After the gateway device state switches, gateway A is not deleted the route of acquiring with the bgp neighbor of subscriber equipment foundation immediately, gateway B does not delete the route of the directed towards user equipment of acquiring from gateway A immediately yet, still use these routes to instruct the flow of returning to be transmitted to subscriber equipment, do not interrupt to guarantee the business of returning subscriber equipment from bearer network;
In the GR of gateway B and subscriber equipment process, gateway B can acquire the route of these directed towards user equipment again, the route that gateway B preferably acquires from subscriber equipment also is transmitted to gateway A by IBGP neighbours with it, the route that gateway A preferred gateways B sends, and the corresponding route of sending with gateway B directly acquired from subscriber equipment of deletion; After the GR of gateway B and subscriber equipment finishes, gateway B deletes the route of all directed towards user equipment of acquiring from gateway A, simultaneously by other protocol massages such as expansion VRRP protocol massages or IBGP, notifying gateway A GR finishes, gateway A is deleted all routes that directly obtain from subscriber equipment again, till this time, the route that gateway B goes up all directed towards user equipment all is directly to obtain from the bgp neighbor with subscriber equipment foundation, and the route of all directed towards user equipment all is to learn from the IBGP neighbours with gateway B foundation on the gateway A.In this process, gateway A and gateway B do not have initiatively to delete the forwarding item of directed towards user equipment, upgrade the technology that combines with deletion but adopt, and have guaranteed that effectively the flow that returns subscriber equipment does not interrupt because of the switching of gateway device state.When the user insensitive to the flow interrupt time that bearer network returns, perhaps adopt in other technologies such as gateway A and gateway B deploy static routing or IBGP agreements and instruct in the forwarding of flow that bearer network returns, between gateway A and gateway B, dispose the IBGP agreement not necessarily.
In addition, from the angle of GR, generally require the source port number of newly-established connection different, otherwise the connection request that TCP may ignore or fault processing is new cause GR inefficacy or GR elongated recovery time with the previous port numbers that connects.In order to address this problem, the gateway host apparatus can be announced the source port number of its bgp neighbor use of setting up with subscriber equipment by other agreements such as expansion VRRP agreement or IBGP to the gateway stand-by equipment, like this, gateway B becomes after the new gateway host apparatus, when setting up bgp neighbor with subscriber equipment, autotelic this port numbers of not using is as source port number.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (12)
1. the method based on active/standby gateway apparatus state resuming service after switching is characterized in that, comprises the steps:
A. set up Border Gateway Protocol (BGP) when being connected when between subscriber equipment and the gateway device, gateway device uses the source address of virtual redundant routing protocol (VRRP) virtual address as bgp protocol;
B. gateway device is active and standby switch with state after, new gateway host apparatus adopts the mode of Graceful Restart (GR) to set up Border Gateway Protocol (BGP) with subscriber equipment to be connected, the assurance subscriber equipment is set up agreement smoothly with new gateway host apparatus and is connected.
2. method according to claim 1 is characterized in that, described step B specifically comprises, increases the function that the GR technology is expanded bgp protocol in bgp protocol, makes between subscriber equipment and the gateway device and can realize the GR technology.
3. method according to claim 2 is characterized in that, comprises VRRP module and BGP module, and described step B specifically comprises,
B1. after the gateway device state switched, the VRRP module in the new gateway host apparatus was switched the BGP module that message announcement is given gateway device with the gateway device state;
B2. after the BGP module of gateway device received that gateway device state that new gateway host apparatus sends switches message, it initiatively sent the connection request message of bgp protocol to the BGP of subscriber equipment module;
B3. the BGP module of subscriber equipment is handled described message according to the BGP connection request message of receiving according to the GR technology.
4. according to right 3 described methods, it is characterized in that described B2 comprises specifically that the BGP module of gateway device is set up to put in the message (OPEN) neighbours and restarts (Restart) mark, initiates the agreement connection request message with subscriber equipment.
5. method according to claim 1 is characterized in that, after step B, also specifically comprises:
C. between new gateway host apparatus and previous gateway host apparatus, set up the IBGP agreement and connect, make new gateway host apparatus and previous gateway host apparatus that the route of subscriber equipment issue all be arranged;
D. after the gateway device state switches, new gateway host apparatus and previous gateway host apparatus are not initiatively deleted the route that previous gateway host apparatus is learnt from subscriber equipment, the described route of using new gateway host apparatus instructs the flow of returning from bearer network to be transmitted to subscriber equipment, does not interrupt to guarantee the business of returning subscriber equipment.
6. method according to claim 5 is characterized in that, described step D specifically comprises,
D1. in the new gateway host apparatus and the GR process of subscriber equipment, new gateway host apparatus can be acquired the route of previous gateway host apparatus directed towards user equipment again from subscriber equipment;
D2. new gateway host apparatus is given previous gateway host apparatus by the IBGP agreement with described routing forwarding, and previous gateway host apparatus keeps the described route received and deletes the corresponding route that it is directly acquired from subscriber equipment according to the described route of being received;
D3. after the GR of new gateway host apparatus and subscriber equipment finishes, new gateway host apparatus is deleted the route of all directed towards user equipment of acquiring from previous gateway host apparatus, finish to previous gateway host apparatus announcement GR with stylish gateway host apparatus, previous gateway host apparatus is deleted the route that all directly obtain from subscriber equipment again.
7. method according to claim 6 is characterized in that, in step D3, described new gateway host apparatus finishes to previous gateway host apparatus announcement GR by expansion VRRP protocol massages.
8. method according to claim 1 is characterized in that, and is elongated for fear of the time that GR lost efficacy or GR recovers, and the source port number of the connection that new gateway host apparatus is set up is different with the port numbers that previous gateway host apparatus connects.
9. method according to claim 8 is characterized in that, when gateway host apparatus and subscriber equipment connected, the gateway host apparatus was announced it by expansion VRRP agreement to the gateway stand-by equipment and set up the source port number of bgp neighbor use with subscriber equipment.
10. the system based on active/standby gateway apparatus state resuming service after switching is characterized in that, comprises that gateway device, subscriber equipment, BGP module, VRRP module, VRRP switch sensing module and switching notice module,
Move virtual redundant routing protocol by the VRRP module between the described gateway device;
Described gateway device and subscriber equipment all dispose Graceful Restart (GR) technology, and set up the Border Gateway Protocol connection by the BGP module;
Described switching notice module is used to announce gateway device state switching message and switches sensing module to VRRP;
Described VRRP switches sensing module and switches message to the BGP of subscriber equipment module initiation bgp protocol connection request message according to the gateway device state of being received;
The BGP module of described subscriber equipment is carried out Graceful Restart (GR) according to the bgp protocol connection request message of being received.
11, system according to claim 10 is characterized in that, described switching notice module is embedded in the VRRP inside modules.
12, system according to claim 10 is characterized in that, described VRRP switches the BGP inside modules that sensing module is embedded in gateway device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510102085 CN1980224A (en) | 2005-12-01 | 2005-12-01 | Method and system for recovering business after apparatus state switching-over based on main and spare netgate |
| CN200680013610.9A CN100527716C (en) | 2005-12-01 | 2006-08-16 | Method and gateway equipment for resuming service after switching status of main/standby gateway device |
| PCT/CN2006/002080 WO2007062559A1 (en) | 2005-12-01 | 2006-08-16 | A method and gateway device for service recovery when master and slaving gateway devices switched |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510102085 CN1980224A (en) | 2005-12-01 | 2005-12-01 | Method and system for recovering business after apparatus state switching-over based on main and spare netgate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1980224A true CN1980224A (en) | 2007-06-13 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510102085 Pending CN1980224A (en) | 2005-12-01 | 2005-12-01 | Method and system for recovering business after apparatus state switching-over based on main and spare netgate |
| CN200680013610.9A Expired - Fee Related CN100527716C (en) | 2005-12-01 | 2006-08-16 | Method and gateway equipment for resuming service after switching status of main/standby gateway device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680013610.9A Expired - Fee Related CN100527716C (en) | 2005-12-01 | 2006-08-16 | Method and gateway equipment for resuming service after switching status of main/standby gateway device |
Country Status (2)
| Country | Link |
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| CN (2) | CN1980224A (en) |
| WO (1) | WO2007062559A1 (en) |
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| WO2009105983A1 (en) * | 2008-02-27 | 2009-09-03 | 华为技术有限公司 | Method and system for neighbor migration in border gateway protocol distributed system |
| CN100558057C (en) * | 2007-07-20 | 2009-11-04 | 华为技术有限公司 | A kind of processing method of two-way converting inspection session and device |
| CN101094049B (en) * | 2007-07-18 | 2010-09-01 | 杭州华三通信技术有限公司 | Smoothing restarting method and neighbor devices |
| WO2010099749A1 (en) * | 2009-03-04 | 2010-09-10 | 华为技术有限公司 | Method and apparatus for transferring virtual routing and forwarding (vrf), and vrf distributed communication system |
| CN101340369B (en) * | 2008-08-14 | 2011-01-19 | 杭州华三通信技术有限公司 | Method and router for realizing virtual connection supported optimum restart |
| CN101616069B (en) * | 2008-06-23 | 2012-04-04 | 华为技术有限公司 | Information restoration method based on graceful restart and router |
| CN101695069B (en) * | 2009-10-22 | 2012-04-04 | 南京科远自动化集团股份有限公司 | Enetgw communication gateway |
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- 2006-08-16 WO PCT/CN2006/002080 patent/WO2007062559A1/en active Application Filing
- 2006-08-16 CN CN200680013610.9A patent/CN100527716C/en not_active Expired - Fee Related
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| CN100558057C (en) * | 2007-07-20 | 2009-11-04 | 华为技术有限公司 | A kind of processing method of two-way converting inspection session and device |
| CN101521616B (en) * | 2008-02-27 | 2012-07-04 | 华为技术有限公司 | Method and system for neighbor migration in Border Gateway Protocol (BGP) distributed system |
| WO2009105983A1 (en) * | 2008-02-27 | 2009-09-03 | 华为技术有限公司 | Method and system for neighbor migration in border gateway protocol distributed system |
| CN101616069B (en) * | 2008-06-23 | 2012-04-04 | 华为技术有限公司 | Information restoration method based on graceful restart and router |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101164307A (en) | 2008-04-16 |
| CN100527716C (en) | 2009-08-12 |
| WO2007062559A1 (en) | 2007-06-07 |
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