CN101159669A - Service flow switching method and apparatus - Google Patents
Service flow switching method and apparatus Download PDFInfo
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- CN101159669A CN101159669A CNA2007101638664A CN200710163866A CN101159669A CN 101159669 A CN101159669 A CN 101159669A CN A2007101638664 A CNA2007101638664 A CN A2007101638664A CN 200710163866 A CN200710163866 A CN 200710163866A CN 101159669 A CN101159669 A CN 101159669A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
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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
- H04L45/12—Shortest path evaluation
- H04L45/125—Shortest path evaluation based on throughput or bandwidth
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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
- H04L45/22—Alternate routing
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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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
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
Abstract
The invention discloses a service flow switching method and a device for switching service flow according to link quality, so as to guarantee normal transmission of service and improve reliability of network. The method comprises switching the service flow on a master link to a reserved link when the link quality parameter of the master link is larger than or equals to the predetermined threshold while the link quality parameter of the reserved link is smaller than the predetermined threshold.
Description
Technical field
The present invention relates to networking technology area, relate in particular to a kind of service flow switching method and device.
Background technology
Generally, arriving same destination and have many routes, can be of equal value, also can be non-equivalence.When having equal-cost route, adopt the load balancing mode to E-Packet, and, can carry out the adjusting of flow by the weighted value of each route.Under the non-equivalence situation, can select optimum routing forwarding message, behind the routing failure of optimum, equipment is selected an optimum routing forwarding message (being equivalent to original hypo-optimal route) from remaining route.
Route in the routing table normally generates by Routing Protocol, and Routing Protocol is selected the path according to the jumping figure of link, the static bandwidth of physical link usually.As shown in Figure 1, when being generated to the route of equipment F on equipment B, because the bandwidth of link B-C-E is 300M, and the bandwidth of link B-D-E is 200M, is active link so can select the B-C-E link, and the B-D-E link is a reserve link.If bearer network is multiprotocol label switching (MPLS, a Multi-protocol Label Switching) network, also can preferentially select the bigger link of bandwidth as active link.If bearer network is media interviews control tunnel (MAC INMAC) network, great majority are manual configuration routes at present, also are preferentially to select the bigger link of bandwidth as active link.
The MPLS technology is used on backbone network in a large number, and the basic comprising unit of MPLS network is that tag changeable path is by (LSR, Label Switching Router).Wherein, be positioned at the MPLS network edge, and the LSR that is used to connect other user network is called Edge LSR, i.e. tag edge router (LER, Label EdgeRouter).The LSR of MPLS network internal is called core LSR.Use the MPLS signaling to communicate between the LSR of MPLS network internal.At the edge of MPLS network, undertaken adaptive by LER and traditional Internet Protocol (IP, Internet Protocol) technology.
In the inside of MPLS network, can set up a tunnel from ingress LER (being Ingress) to egress LER (being Egress) by the MPLS signaling in advance, promptly label switched path (LSP, Label SwitchedPath) utilizes this LSP to E-Packet.
Equally, arrive same destination and may have many LSP, can be of equal value also can be non-equivalence.When having LSP of equal value, adopt the load balancing mode to transmit when E-Packeting, and, the flow distribution that can regulate LSP by the weighted value of regulating each LSP.Under the non-equivalence situation, select optimum LSP to E-Packet, after the LSP of optimum broke down, router selected an optimal L SP to E-Packet (being equivalent to original suboptimum LSP) from remaining LSP.
MAC IN MAC is a kind of tunneling technique based on Ethernet, and the MAC Address that directly encapsulates backbone network by two layers of Ethernet message will receiving enters the backbone network transmission, and the MAC by the user after fringe node removes backbone network MAC transmits.
Equally, many MAC IN MAC tunnels can be arranged to same destination, can be of equal value also can be non-equivalence.When having tunnel of equal value, adopt the load balancing mode to transmit, and the weighted value that can regulate each tunnel is regulated the flow distribution in tunnel.Under the non-equivalence situation, select optimum tunnel to E-Packet, after the tunnel of optimum breaks down, from remaining tunnel, select an optimum tunnel to E-Packet (being equivalent to original suboptimum MAC IN MAC tunnel).
But the mode of selecting route by the jumping figure and the bandwidth of link is static, does not consider to have defective in some cases by actual link-quality.Such as, two paths, a bandwidth is 300M, another is 200M, but this link-quality of 300M is bad, has packet loss, causes often occurring message and retransmits.And,, still can select this link to come transport service as long as this link does not break down according to the mechanism of prior art.Therefore, the re-transmission of carrying out message so repeatedly not only can increase the weight of link load, and retransmission processes is heavy might to cause the intermittent of business, so also can have influence on business.
At present, in order to detect the fault of link, usually adopt two-way forwarding to detect (BFD, BidirectionalForwarding Detection)/operation, the management of MPLS, safeguard (OAM, Operation, Administration and Maintenance), operation, the management of Ethernet, the modes such as (OAM) of safeguarding detect link/tunnel, so that fault that can the fast detecting outgoing link.But these mechanism of BFD/MPLSOAM/ Ethernet OAM can only detect link fault-free, and quality that can the perception link, as long as in the fixed cycle, can also receive the other side's message, even packet loss is very high, can not think that link has fault yet, just can not carry out the switching of service traffics yet.
Summary of the invention
The embodiment of the invention provides a kind of service flow switching method and device, in order to according to link-quality service switchover flow, guarantees professional normal transmission, and improves the reliability of network.
The method that the embodiment of the invention provides comprises:
When the link quality parameter of active link more than or equal to pre-set threshold, and the link quality parameter of reserve link switches to the service traffics on the active link on the reserve link during less than described pre-set threshold.
The device that the embodiment of the invention provides comprises: link-quality detecting unit and flow switch unit;
Described link-quality detecting unit is used for link quality parameter when active link more than or equal to pre-set threshold, and the link quality parameter of reserve link triggers described flow switch unit during less than described pre-set threshold;
Described flow switch unit is used for the triggering according to described link-quality detecting unit, and the service traffics on the active link are switched on the reserve link.
The embodiment of the invention, when the link quality parameter of active link more than or equal to pre-set threshold, and the link quality parameter of reserve link is during less than described pre-set threshold, service traffics on the active link are switched on the reserve link, thereby guaranteed professional normal transmission, and, improved the reliability of network.
Description of drawings
Fig. 1 is a network link schematic diagram of the prior art;
The IP network link schematic diagram of Fig. 2 for providing in the specific embodiment of the invention;
The method flow schematic diagram that Fig. 3 provides for the specific embodiment of the invention;
The MPLS network link schematic diagram of Fig. 4 for providing in the specific embodiment of the invention;
The method flow schematic diagram that Fig. 5 provides for the specific embodiment of the invention;
The MAC IN MAC network link schematic diagram of Fig. 6 for providing in the specific embodiment of the invention;
The method flow schematic diagram that Fig. 7 provides for the specific embodiment of the invention;
The method flow schematic diagram that Fig. 8 provides for the overall embodiment of the present invention;
The apparatus structure schematic diagram that Fig. 9 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of service flow switching method and device.By detecting link-quality, comprise time delay, shake, packet loss etc., find the quality problems that active link exists, in advance whole flows on the active link or partial discharge are switched on the reserve link, to reduce professional re-transmission, guarantee professional normal transmission, and improve the reliability of network.
Be example with IP network, MPLS network and MAC IN MAC network respectively below, introduce specific embodiments of the invention respectively.
Embodiment one:
Referring to Fig. 2, in the IP network, there are two at the equipment B place and are routed to equipment F, wherein the bandwidth of B-C-E link is 300M, the bandwidth of B-D-E link is 200M.When Routing Protocol generated route, selecting the link of 300M bandwidth was active link, and the link of 200M bandwidth is a reserve link.
So, referring to Fig. 3, realize that the method that service traffics are switched comprises:
S301, at the equipment B place, explore (PING by the IP message Internet, Packet InternetGroper), promptly utilize Internet Control Message Protocol (ICMP, Internet Control Message Protocol) response (ICMP Echo) and reply whether certain network equipment can reach in the test I P network, detecting active and standby link-quality, regularly collect the relevant parameters such as time delay, shake, packet loss of active and standby link, generate the database of active and standby link.
S302, regularly check the parameters such as time delay, shake, packet loss of the active and standby link in the database, if time delay, the shake of discovery active link are bigger, packet loss is higher, exceeded the scope that pre-establishes, and the quality of reserve link is better, at this moment, by reducing the weighted value of active link, improve the weighted value of reserve link, all or part of flow of active link is switched to reserve link, thereby reduce the flow of active link, reduce the re-transmission of message.
S303, after the active link quality is recovered, readjust the weighted value of active and standby link, recover the original service traffics of active link.
When service traffics are switched to reserve link, can pass through collocation strategy, emphasis business (as real time business such as voice, videos) flow is switched on the reserve link, preferentially guarantee the business that these real-times are higher.
If two link is operated in the load balancing mode, promptly active and standby link equivalence, same, can be by the mass parameter of these two links of monitoring, the service traffics that priority is high select the measured link of matter to transmit, and guarantee the normal transmission of high-priority service.
Embodiment two:
Referring to Fig. 4, in the MPLS network, exist two lsp tunnels to equipment F at the equipment B place, wherein the bandwidth of B-C-E link is 300M, and the bandwidth of B-D-E link is 200M, and the lsp tunnel of 300M bandwidth is an active link, and the lsp tunnel of 200M bandwidth is a reserve link.
So, referring to Fig. 5, realize that the method that service traffics are switched comprises:
S501, at the equipment B place, detect active and standby lsp tunnel quality by LSP PING, regularly collect the relevant parameters such as time delay, shake, packet loss of active and standby lsp tunnel, generate the database of active and standby lsp tunnel.
S502, regularly check the parameters such as time delay, shake, packet loss of the active and standby lsp tunnel in the database, if find that the master is bigger with time delay, the shake of lsp tunnel, packet loss is higher, exceeded the scope that pre-establishes, and the quality of standby lsp tunnel is better, at this moment, by reducing main weighted value with lsp tunnel, improve the weighted value of standby lsp tunnel, main a part of flow with lsp tunnel is switched to standby lsp tunnel, thereby reduce main flow, reduce the re-transmission of message with lsp tunnel.
S503, when main recover with the lsp tunnel quality after, readjust the weighted value of active and standby lsp tunnel, recover main with the original service traffics of lsp tunnel.
Embodiment three:
Referring to Fig. 6, in the MAC IN MAC network, exist two MAC IN MAC tunnels to equipment F at the equipment B place, wherein the B-C-E link is 300M, the B-D-E link is 200M, and the MAC IN MAC tunnel of 300M bandwidth is an active link, and the MAC IN MAC tunnel of 200M bandwidth is a reserve link.
So, referring to Fig. 7, realize that the method that service traffics are switched comprises:
S701, at the equipment B place, MAC PING by 802.1ag detects active and standby MAC IN MAC tunnel quality, regularly collect the relevant parameters such as time delay, shake, packet loss in active and standby MAC IN MAC tunnel, generate the database in active and standby MAC IN MAC tunnel.
S702, regularly check the master in the database, the time delay that is equipped with MAC IN MAC tunnel, shake, parameters such as packet loss, if find main time delay with MAC IN MAC tunnel, shake bigger, packet loss is higher, exceeded the scope that pre-establishes, and the quality in standby MAC IN MAC tunnel is better, at this moment, by reducing main weighted value with MAC IN MAC tunnel, improve the weighted value in standby MAC IN MAC tunnel, main a part of flow with MAC IN MAC tunnel is switched to standby MAC IN MAC tunnel, thereby reduce main flow, reduce the re-transmission of message with MAC IN MAC tunnel.
S703, when main recover with MAC IN MAC tunnel quality after, readjust the weighted value in active and standby MAC INMAC tunnel, recover main with the original service traffics in MAC IN MAC tunnel.
Referring to Fig. 8, summarize the method that the embodiment of the invention provides, comprising:
The link-quality of S801, the active and standby link of inspection.
S802, when the link quality parameter of active link more than or equal to pre-set threshold, and the link quality parameter of reserve link switches to the service traffics on the active link on the reserve link during less than described pre-set threshold.
S803, when the link-quality of active link recovers, recover the service traffics of active link.
Referring to Fig. 9, the device that the embodiment of the invention provides comprises: link-quality detecting unit 91, flow switch unit 92 and flow recovery unit 93.
Described link-quality detecting unit 91 is used for link quality parameter when active link more than or equal to pre-set threshold, and the link quality parameter of reserve link triggers described flow switch unit 92 during less than described pre-set threshold.
Described flow switch unit 92 is used for the triggering according to described link-quality detecting unit 91, and the service traffics on the active link are switched on the reserve link.
Described flow recovery unit 93 when being used for link quality parameter when active link less than pre-set threshold, switches to the service traffics on the reserve link on the active link.
Described link-quality detecting unit 91 comprises:
Determining unit 912, be used for by the described database of cyclic check, when the link quality parameter of finding active link more than or equal to pre-set threshold, and, the link quality parameter of reserve link is during less than pre-set threshold, the link parameter of determining active link is more than or equal to pre-set threshold, and the link parameter of reserve link is less than described pre-set threshold, and triggers described flow switch unit 92.
Described flow switch unit 92 comprises:
Preferably, described switch unit 922 further according to the service priority that sets in advance, switches to the partial service flow that transmits on the active link on the reserve link and to transmit.
In sum, the embodiment of the invention, be applicable to that IP network, MPLS network (comprise MPLS public network, MPLS L2VPN (L2VPN, MPLS Layer3 Virtual Private Network (L3VPN, Layer3 virtual private networks)) and MAC IN MAC network etc. Layer 2 virtual private networks).By detecting the link-quality of active and standby link, before active link breaks down, therefore the whole service traffics or the partial service flow of active link switched on the reserve link,, reduce the packet loss of the business datum of being transmitted, guaranteed professional normal transmission.Simultaneously, also alleviate the burden of active link, reduced the out of order probability of active link, therefore, also improved the reliability of network.In addition, the embodiment of the invention, if link/tunneling under load sharing condition, can pass through the quality of each link of monitoring, the measured link of service selection matter that priority is high transmits, and makes that the transmission reliability of high-priority service is higher.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. a service flow switching method is characterized in that, this method comprises:
When the link quality parameter of active link more than or equal to pre-set threshold, and the link quality parameter of reserve link switches to the service traffics on the active link on the reserve link during less than described pre-set threshold.
2. method according to claim 1 is characterized in that, the link quality parameter of determining active link is more than or equal to pre-set threshold, and the link quality parameter of reserve link comprises less than the step of described pre-set threshold:
The link quality parameter information that periodicity is collected described active link and reserve link;
When the link quality parameter of described active link more than or equal to described pre-set threshold, and, the link quality parameter of described reserve link is during less than described pre-set threshold, the link parameter of determining active link is more than or equal to pre-set threshold, and the link parameter of reserve link is less than described pre-set threshold.
3. method according to claim 1 is characterized in that, by reducing the weighted value of active link, improves the weighted value of reserve link, realizes the service traffics on the active link are switched on the reserve link.
4. method according to claim 1 is characterized in that, according to the service priority that sets in advance, the partial service flow on the active link is switched on the reserve link.
5. according to the described method of the arbitrary claim of claim 1 to 4, it is characterized in that this method also comprises:
When the link quality parameter of active link during, the service traffics on the reserve link are switched on the active link less than pre-set threshold.
6. a service traffics control device is characterized in that, this device comprises: link-quality detecting unit and flow switch unit;
Described link-quality detecting unit is used for link quality parameter when active link more than or equal to pre-set threshold, and the link quality parameter of reserve link triggers described flow switch unit during less than described pre-set threshold;
Described flow switch unit is used for the triggering according to described link-quality detecting unit, and the service traffics on the active link are switched on the reserve link.
7. device according to claim 6 is characterized in that, described link-quality detecting unit comprises:
Parameter acquiring unit is used for the link quality parameter information of periodically collecting active link and reserve link;
Determining unit, be used for working as the link quality parameter of described active link more than or equal to described pre-set threshold, and, the link quality parameter of described reserve link is during less than described pre-set threshold, the link parameter of determining active link is more than or equal to pre-set threshold, and the link parameter of reserve link is less than described pre-set threshold, and triggers described flow switch unit.
8. device according to claim 6 is characterized in that, described flow switch unit comprises:
Adjustment unit is used to reduce the weighted value of active link, improves the weighted value of reserve link;
Switch unit is used for according to the active link after handling through described adjustment unit and the weighted value of reserve link the service traffics on the active link being switched on the reserve link.
9. device according to claim 6 is characterized in that, described flow switch unit according to the service priority that sets in advance, switches to the partial service flow on the active link on the reserve link.
10. according to the described device of the arbitrary claim of claim 6 to 9, it is characterized in that this device also comprises:
The flow recovery unit when being used for link quality parameter when active link less than pre-set threshold, switches to the service traffics on the reserve link on the active link.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101638664A CN101159669A (en) | 2007-10-09 | 2007-10-09 | Service flow switching method and apparatus |
| PCT/CN2008/071478 WO2009046644A1 (en) | 2007-10-09 | 2008-06-28 | A method and device for traffic flow switching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101638664A CN101159669A (en) | 2007-10-09 | 2007-10-09 | Service flow switching method and apparatus |
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| CN101159669A true CN101159669A (en) | 2008-04-09 |
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| CNA2007101638664A Pending CN101159669A (en) | 2007-10-09 | 2007-10-09 | Service flow switching method and apparatus |
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| WO (1) | WO2009046644A1 (en) |
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