CN102104491B - Rapid protection switching method and device - Google Patents
Rapid protection switching method and device Download PDFInfo
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- CN102104491B CN102104491B CN200910243672.4A CN200910243672A CN102104491B CN 102104491 B CN102104491 B CN 102104491B CN 200910243672 A CN200910243672 A CN 200910243672A CN 102104491 B CN102104491 B CN 102104491B
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Abstract
The invention discloses a rapid protection switching method, which comprises the following steps of: maintaining an infrastructure protection group (IPG) List and a protection membership list corresponding to each IPG list item of the IPG List on a segment endpoint bridge (SEB) of an IPG; when the SEB detects a failure or receives a switching instruction, updating a forwarding table according to the IPG list items in the IPG List and the corresponding protection membership list; and in the process of updating the forwarding table, forwarding a received message according to the IPG list items in the IPG List and the corresponding protection membership list. The invention also discloses a rapid protection switching device. By the method and the device, rapid protection switching is realized, and forwarding performance in the protection switching is improved.
Description
Technical field
The present invention relates to network service resist technology, relate in particular to a kind of method and apparatus of quick protective switch.
Background technology
Along with the proposition of carrier-class Ethernet concept, in order to make Ethernet reach telecommunications rank standard, the protection of Ethernet is switched and had higher requirement, the claimed time of switching reaches below 50ms conventionally.Operator backbone bridging technology (PBB-TE in existing support traffic engineering; Provider BackboneBridge-Traffic Engineering) in; support is to flow Engineering Service example (TESI; TrafficEngineering Service Instance) protection, is a kind of protecting tunnel end to end.In to the protection of TESI, once middle certain link or certain node break down, must switch by whole piece TESI, and on this faulty link or malfunctioning node when having many TESI, can cause the switching of many TESI.That is to say, the object of protection of PBB-TE end-to-end protection is TESI, when the TESI of certain work being detected, breaks down, and needs with another protection TESI, to carry out Reseal to entering the user's message in this PBB-TE tunnel, makes flow walk to protect PBB-TE tunnel.TESI is herein comprised of one group of Ethernet switched path (ESP, Ethernet Switch Path), forms a two-way service; ESP is determined by a tlv triple: < backbone network object MAC, backbone network source MAC, backbone network VLAN>, i.e. <B-DA, B-SA, B-VID>.This protection scheme end to end not only protects the time of switching longer, take a large amount of TESI resources, and the node involving is too many, cannot protect intermediate line link and intermediate node.
For Ethernet, link and Node Protection are parts for Ethernet protection, and most network failure is all to appear on certain link or certain node, therefore, PBB-TE part tunnel or whole piece tunnel are carried out to link protection and also become more urgent.Have at present the demand that Duo Jia operator has proposed PBB-TE to carry out link protection; the active link special configuration reserve link in a certain some work link in PBB-TE tunnel or covering whole piece PBB-TE tunnel is protected, active link and reserve link form IPG (Infrastructure Protection Group).So-called IPG, be in the project IEEE802.1Qbf that developing at present of IEEE802.1 working group, discuss for one section of link in PBB-TE and wherein intermediate node protect and protection group that one section of active section stipulating and a few segment protect section form.
As shown in Figure 1, the flow of all PBB-TE of being subject to segment protects forwards from active link existing PBB-TE segment protect under normal circumstances; When this section of active link breaks down; IPG end points as PBB-TE protection; i.e. section end points bridge (SEB; Segment Endpoint Bridge), this fault can be detected in time, and the outbound port of transmitting list item corresponding to TESI that is subject to this section of IPG protection is revised as to the corresponding outbound port of reserve link; thereby by flow switch to reserve link; realize the protection to active link, guaranteed the normal forwarding of network traffics, improved the reliability of network.SEB herein, can be the backbone edge bridge (BEB, Backbone Edge Bridge) in PBB-TE, can be also key core bridges (BCB, Backbone Core Bridge).
In current PBB-TE infrastructure protection, after active link being detected and breaking down, be directly upgrade transmit in corresponding list item, and then by inquiry, transmit to realize the forwarding of message.Because the link needing protection is all important link conventionally, and for protection probably belong to link many TESI the path of process, need to lay special stress on protecting.Therefore,, if the link of this section of focused protection breaks down, for the SEB in PBB-TE infrastructure protection, it is transmitted and may have a large amount of list items and need to upgrade; And may cause like this protection switch time to increase, thus increase packet loss, have a strong impact on the forwarding performance of SEB, more serious may causing cannot meet the requirement that carrier class Ethernet 50ms switches.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and apparatus of quick protective switch, to realize quick protective switch, and improves the forwarding performance of protecting while switching.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that the invention provides quick protective switch, the method comprises:
On the section end points bridge (SEB) of IPG, safeguard protection group list (IPG List), and the corresponding protection of each IPG list item member list of described IPG List;
Described SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in described IPG List and corresponding protection member list update; And in the process of transmitting in renewal, according to the IPG list item in described IPG List and corresponding protection member list, the message receiving is forwarded.
Each IPG list item of described IPG List adopts IPG ID unique identification, and also comprises in described each IPG list item: the pointer of the active link corresponding with each IPG, protection link, switching sign and the corresponding protection of sensing member list;
Described protection member list comprises the corresponding object of protection traffic engineering of IPG ID Service Instance (TESI) information.
Described SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in IPG List and corresponding protection member list update, is specially:
Described SEB, when fault being detected or receiving switching command, by described overall modified logo (MF) set of transmitting, transmits the modification pattern that enters described in expression; And by described fault or switching command the switching sign set in corresponding IPG list item, represent that corresponding IPG enters switch mode;
Described SEB is according to the TESI information in protection member list corresponding to described IPG list item, will in described transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in described IPG list item is corresponding.
The method further comprises: the list item that described SEB is transmitting in the protection member correspondence of IPG completes after renewal, by the switching sign zero clearing of described IPG; After the renewal of transmitting described in completing, by MF zero clearing.
In the described process of transmitting in renewal, according to the IPG list item in IPG List and corresponding protection member list, the message receiving is forwarded, is specially:
Described SEB is when receiving message, and the corresponding list item of transmitting described in searching according to the header information of described message, obtains the outbound port in corresponding list item;
Described SEB judges whether set of MF, if set, according to the outbound port obtaining and the header information of described message, search the corresponding IPG list item in IPG List, and during the set of the switching in described IPG list item sign, the outbound port that obtains protection link from described IPG list item, carries out message repeating according to the outbound port of described protection link;
When described MF does not have set and/or switch sign there is no set, described SEB carries out message repeating according to transmitting the outbound port obtaining described in searching.
The present invention also provides a kind of device of quick protective switch, and this device comprises:
List maintenance module, for safeguard IPG List on the SEB of IPG, and the corresponding protection of each IPG list item member list of described IPG List;
Update module, for when described SEB detects fault or receives switching command, transmits according to the IPG list item in described IPGList and corresponding protection member list update;
Packet forwarding module, for the process of transmitting in renewal, according to the IPG list item in described IPG List and corresponding protection member list, forwards the message receiving.
Each IPG list item of described IPG List adopts IPG ID unique identification, and also comprises in described each IPG list item: the pointer of the active link corresponding with each IPG, protection link, switching sign and the corresponding protection of sensing member list;
Described protection member list comprises the corresponding object of protection TESI of IPG ID information.
Described update module is further used for, when described SEB detects fault or receives switching command, by described MF set of transmitting, and by described fault or switching command the switching sign set in corresponding IPG list item; According to the TESI information in protection member list corresponding to described IPG list item, will in described transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in described IPG list item is corresponding.
Described update module is further used for, and the list item of transmitting in the protection member correspondence of IPG completes after renewal, by the switching sign zero clearing of described IPG; After the renewal of transmitting described in completing, by MF zero clearing.
Described packet forwarding module is further used for, and when receiving message, the corresponding list item of transmitting described in searching according to the header information of described message, obtains the outbound port in corresponding list item;
Judge whether set of MF, if set, according to the outbound port obtaining and the header information of described message, search the corresponding IPG list item in IPG List, and during the set of the switching in described IPG list item sign, the outbound port that obtains protection link from described IPG list item, carries out message repeating according to the outbound port of described protection link;
When described MF does not have set and/or switch sign there is no set, according to transmitting the outbound port obtaining described in searching, carry out message repeating.
The method and apparatus of a kind of quick protective switch provided by the present invention; by introducing an expression, transmit the overall modified logo (MF) of modification state, and the switching of protection group list (IPG List) and each protection group identifies to realize the quick switching to active link and protection link in the infrastructure protection of PBB-TE.MF set, represents to transmit to revise relevant entries, while E-Packeting before completing the modification of transmitting, need to E-Packet according to the relevant information in corresponding IPG list item in the IPG List on this end points.
By the present invention; if solved, need to upgrade while transmitting list item in a large number the masterslave switchover time long; the problem that easily produces a large amount of packet losses and cause unfailing performance to decline, thus realize after active link fault being detected, can rapidly message be forwarded by protection link.Although when breaking down, revising E-Packets before finishing transmits the IPG List table that also needs to inquire about except inquiry to this mode transmitting at every turn, due to this table simply, inquiry velocity is very fast, does not substantially affect forwarding performance.And the method can be switched to message fast protection and transmit on link, be not subject to the impact of the TESI number of IPG protection switching time, improved forward efficiency, greatly reduced packet loss.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of PBB-TE segment protect in prior art;
Fig. 2 is the schematic diagram of IPG List in the present invention;
Fig. 3 is the network architecture schematic diagram in the embodiment of the present invention;
Fig. 4 is the initial condition schematic diagram of IPG List in the embodiment of the present invention;
Fig. 5 is the view of IPG List when active link breaks down in the embodiment of the present invention;
Fig. 6 is process chart when SEB detects fault in the embodiment of the present invention;
Fig. 7 is the forward process flow chart of SEB to message in the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
For realizing quick protective switch, and improve the forwarding performance of protection while switching, the method of a kind of quick protective switch provided by the present invention, its core concept is: on the SEB of IPG, safeguard protection group list (IPGList), and the corresponding protection of each IPG list item member's list (Membership List) in IPG List; SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in IPG List and corresponding protection member list update; And in the process of transmitting in renewal, according to the IPG list item in IPG List and corresponding protection member list, obtaining the information such as outbound port, the message of receiving according to information butt joint such as the outbound ports obtaining forwards.
As shown in Figure 2, each IPG list item of IPG List adopts IPG ID unique identification, a protection group IPG of each IPG ID sign.Each IPG list item comprises: belong to the protection group IPG that this IPG ID identifies active link, protection link, switch sign and point to the pointer of corresponding protection member list; Protection member list comprises the object of protection TESI information of the corresponding IPG of IPG ID.Wherein, while switching sign set, represent that its corresponding IPG enters switch mode.
In addition, be provided with an overall modified logo (MF, Modification Flag) on each SEB, MF set represents transmitting in modification pattern on this SEB.
Wherein, SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in IPG List and corresponding protection member list update, specifically comprises following operation:
SEB, when fault being detected or receiving switching command, by the MF set of transmitting, represents to transmit the modification pattern that enters; And the sign of the switching in list item corresponding to the IPG List set by certain IPG that affected by fault or switching command, represent that this IPG enters switch mode;
SEB is according to the TESI information in protection member list corresponding to IPG list item, will in transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in IPG list item is corresponding.
In the process that SEB transmits in change, the outbound port according to protection link corresponding in certain IPG in IPG List table, forwards the message receiving, and specifically comprises following operation:
SEB, when receiving message, searches the corresponding list item of transmitting according to the header information of message, obtain the outbound port in corresponding list item;
SEB judges whether set of MF, if set, according to the outbound port obtaining and the header information of message, search the corresponding IPG list item in IPG List, and during the set of the switching in IPG list item sign, from IPG list item, obtain the outbound port of protection link, according to the outbound port of protection link, carry out message repeating;
When MF does not have set and/or switch sign there is no set, SEB transmits the outbound port obtaining and carries out message repeating according to searching.
Below in conjunction with the embodiment shown in Fig. 3, the method for quick protective switch of the present invention is further described.As shown in Figure 3, the path of TESI1 is A-C-D-E, and the path of TESI2 is B-C-D-F.Wherein, done infrastructure protection of PBB-TE between network node C, D, and node C, D be SEB of the present invention, active link is 1-1, and reserve link is 2-2.
On C, D node, difference configuration of IP G List, as shown in Figure 4, comprises the master port 1 that active link is corresponding in IPG1 list item, protection port 2 corresponding to protection link, and the switching of corresponding IPG1 sign.In initial condition, to switch and be designated 0, expression does not switch or handover operation completes.When 1-1 link, when active link breaks down, node C, D need to carry out operation as shown in Figure 6, specifically comprise the following steps:
Step 601, arranges the MF transmitting, and represents to transmit to enter modification pattern, and revises the switching sign of IPG1 corresponding in IPG List.
As shown in Figure 5, because 1-1 link breaks down, node C, D are when this fault being detected, and the MF just transmitting is set to 1, represent to transmit the modification pattern that enters; And the corresponding switching sign of the protection group IPG1 under 1-1 link is revised as to 1, and representing that IPG1 is at present in switching state, node is upgrading the outbound port of the relevant forwarding entry in the corresponding Membership List of IPG1.
Step 602, by the protected member in Membership List corresponding to this IPG1, i.e. IESI information, change transmit in the outbound port of corresponding list item, outbound port is changed to outbound port corresponding to protection link of this IPG1, port 2.
Step 603, after the relevant entries that the protected member in Membership List is transmitting middle correspondence has been revised, by switching sign (cancellation set) zero clearing of this IPG1; Transmitting after change all completes, by MF (cancellation set) zero clearing, thereby enter normal message forward mode.
In conjunction with the embodiment shown in Fig. 3, the flow process of node C, D execution message repeating as shown in Figure 7, mainly comprises the following steps:
Step 701, receives message and prepares to forward.
Step 702, according to the header information <ESP-DA of message, ESP-VID> searches and transmits corresponding list item, obtains the outbound port of this list item.
Step 703, judges whether MF is set, if set indicates that fault occurs, and performs step 704; Otherwise, represent working properly, execution step 707.
Step 704, searches IPGList according to the header information of the outbound port of finding in step 702 and this message, obtains the corresponding IPG list item of this flow of protection.
Step 705, judges according to the switching sign of this IPG list item, if this switching is designated 0, represents that the part breaking down does not belong to this IPG, performs step 707; Otherwise explanation is that active link or the protection link of this IPG breaks down, execution step 706.
Step 706, find the corresponding outbound port of protecting link, and the message that needs are forwarded is by protecting the outbound port of link to forward according to the determined IPG list item of step 704.
Step 707, transmits obtained outbound port and normally E-Packets according to searching.
The method of corresponding above-mentioned quick protective switch, the present invention also provides a kind of device of quick protective switch, is applied in SEB, and this device comprises: list maintenance module, update module and packet forwarding module.
Wherein, list maintenance module, for safeguard IPG List on the SEB of IPG, and the corresponding protection of each list item member list of IPG List.Update module, when fault being detected at SEB or receiving switching command, transmits according to the IPG list item in IPG List and corresponding protection member list update.Packet forwarding module, for the process of transmitting in renewal, according to the IPG list item in IPG List and corresponding protection member list, forwards the message receiving.
Update module is further used for, when SEB detects fault or receives switching command, by the MF set of transmitting, and by fault or switching command the switching sign set in corresponding IPG list item; According to the TESI information in protection member list corresponding to IPG list item, will in transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in IPG list item is corresponding.After completing the renewal of transmitting, the set of cancelling MF and switching sign.
Packet forwarding module is further used for, and when receiving message, searches the corresponding list item of transmitting according to the header information of message, obtains the outbound port in corresponding list item; Judge whether set of MF, if set, according to the outbound port obtaining and the header information of described message, search the corresponding IPG list item in IPG List, and during the set of the switching in IPG list item sign, from IPG list item, obtain the outbound port of protection link, according to the outbound port of protection link, carry out message repeating; When MF does not have set and/or switch sign there is no set, according to searching, transmit the outbound port obtaining and carry out message repeating.
In sum, the present invention transmits the MF of modification state by introducing an expression, and the switching of IPG List and each protection group identifies to realize the quick switching to active link and protection link in the infrastructure protection of PBB-TE.MF set, represents to transmit to revise relevant entries, while E-Packeting before completing the modification of transmitting, need to E-Packet according to the relevant information of the IPG List on this end points.By the present invention; if solved, need to upgrade while transmitting list item in a large number the masterslave switchover time long; the problem that easily produces a large amount of packet losses and cause unfailing performance to decline, thus realize after active link fault being detected, can rapidly message be forwarded by protection link.Although when breaking down, revising E-Packets before finishing transmits the IPG List table that also needs to inquire about except inquiry to this mode transmitting at every turn, due to this table simply, inquiry velocity is very fast, does not substantially affect forwarding performance.And the method can be switched to message fast protection and transmit on link, the impact that be not subject to shielded TESI number switching time, has improved forward efficiency, has greatly reduced packet loss.Especially in the situation that there is the TESI of One's name is legion to be subject to this PBB-TEinfrastructure protection effect particularly evident.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. a method for quick protective switch, is characterized in that, the method comprises:
On the section end points bridge (SEB) of IPG, safeguard protection group list (IPG List), and the corresponding protection of each IPG list item member list of described IPG List;
Described SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in described IPG List and corresponding protection member list update; And in the process of transmitting in renewal, according to the IPG list item in described IPG List and corresponding protection member list, the message receiving is forwarded;
Wherein, described SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in IPG List and corresponding protection member list update, is specially:
Described SEB, when fault being detected or receiving switching command, by described overall modified logo (MF) set of transmitting, transmits the modification pattern that enters described in expression; And by described fault or switching command the switching sign set in corresponding IPG list item, represent that corresponding IPG enters switch mode;
Described SEB is according to the TESI information in protection member list corresponding to described IPG list item, will in described transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in described IPG list item is corresponding.
2. the method for quick protective switch according to claim 1, it is characterized in that, each IPG list item of described IPG List adopts IPG ID unique identification, and also comprises in described each IPG list item: the pointer of the active link corresponding with each IPG, protection link, switching sign and the corresponding protection of sensing member list;
Described protection member list comprises the corresponding object of protection traffic engineering of IPG ID Service Instance (TESI) information.
3. the method for quick protective switch according to claim 2, is characterized in that, described SEB, when fault being detected or receiving switching command, transmits according to the IPG list item in IPG List and corresponding protection member list update, is specially:
Described SEB, when fault being detected or receiving switching command, by described overall modified logo (MF) set of transmitting, transmits the modification pattern that enters described in expression; And by described fault or switching command the switching sign set in corresponding IPG list item, represent that corresponding IPG enters switch mode;
Described SEB is according to the TESI information in protection member list corresponding to described IPG list item, will in described transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in described IPG list item is corresponding.
4. the method for quick protective switch according to claim 3, is characterized in that, the method further comprises: the list item that described SEB is transmitting in the protection member correspondence of IPG completes after renewal, by the switching sign zero clearing of described IPG; After the renewal of transmitting described in completing, by MF zero clearing.
5. according to the method for quick protective switch described in claim 3 or 4, it is characterized in that, in the described process of transmitting in renewal, according to the IPG list item in IPG List and corresponding protection member list, the message receiving forwarded, be specially:
Described SEB is when receiving message, and the corresponding list item of transmitting described in searching according to the header information of described message, obtains the outbound port in corresponding list item;
Described SEB judges whether set of MF, if set, according to the outbound port obtaining and the header information of described message, search the corresponding IPG list item in IPG List, and during the set of the switching in described IPG list item sign, the outbound port that obtains protection link from described IPG list item, carries out message repeating according to the outbound port of described protection link;
When described MF does not have set and/or switch sign there is no set, described SEB carries out message repeating according to transmitting the outbound port obtaining described in searching.
6. a device for quick protective switch, is characterized in that, this device comprises:
List maintenance module, for safeguard IPG List on the SEB of IPG, and the corresponding protection of each IPG list item member list of described IPG List;
Update module, for when described SEB detects fault or receives switching command, transmits according to the IPG list item in described IPG List and corresponding protection member list update;
Packet forwarding module, for the process of transmitting in renewal, according to the IPG list item in described IPG List and corresponding protection member list, forwards the message receiving;
Described update module is further used for, when described SEB detects fault or receives switching command, by described MF set of transmitting, and by described fault or switching command the switching sign set in corresponding IPG list item; According to the TESI information in protection member list corresponding to described IPG list item, will in described transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in described IPG list item is corresponding.
7. the device of quick protective switch according to claim 6, it is characterized in that, each IPG list item of described IPG List adopts IPG ID unique identification, and also comprises in described each IPG list item: the pointer of the active link corresponding with each IPG, protection link, switching sign and the corresponding protection of sensing member list;
Described protection member list comprises the corresponding object of protection TESI of IPG ID information.
8. the device of quick protective switch according to claim 7, it is characterized in that, described update module is further used for, when described SEB detects fault or receives switching command, by described MF set of transmitting, and by described fault or switching command the switching sign set in corresponding IPG list item; According to the TESI information in protection member list corresponding to described IPG list item, will in described transmitting, change to the outbound port of the corresponding list item of TESI information the outbound port that protection link in described IPG list item is corresponding.
9. the device of quick protective switch according to claim 8, is characterized in that, described update module is further used for, and the list item of transmitting in the protection member correspondence of IPG completes after renewal, by the switching sign zero clearing of described IPG; After the renewal of transmitting described in completing, by MF zero clearing.
10. the device of quick protective switch according to claim 8 or claim 9, it is characterized in that, described packet forwarding module is further used for, when receiving message, the corresponding list item of transmitting described in searching according to the header information of described message, obtains the outbound port in corresponding list item;
Judge whether set of MF, if set, according to the outbound port obtaining and the header information of described message, search the corresponding IPG list item in IPG List, and during the set of the switching in described IPG list item sign, the outbound port that obtains protection link from described IPG list item, carries out message repeating according to the outbound port of described protection link;
When described MF does not have set and/or switch sign there is no set, according to transmitting the outbound port obtaining described in searching, carry out message repeating.
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| CN200910243672.4A CN102104491B (en) | 2009-12-22 | 2009-12-22 | Rapid protection switching method and device |
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| CN200910243672.4A CN102104491B (en) | 2009-12-22 | 2009-12-22 | Rapid protection switching method and device |
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| CN102104491B true CN102104491B (en) | 2014-09-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1754352A (en) * | 2003-02-21 | 2006-03-29 | 日本电信电话株式会社 | Device and method for fault relief of a channel in a communication network |
| CN101227399A (en) * | 2008-01-31 | 2008-07-23 | 华为技术有限公司 | Message transmission method, system and forwarding node |
| CN101505246A (en) * | 2009-03-02 | 2009-08-12 | 中兴通讯股份有限公司 | Fault detection and recovery method for network tunnel sectional protection mode |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1754352A (en) * | 2003-02-21 | 2006-03-29 | 日本电信电话株式会社 | Device and method for fault relief of a channel in a communication network |
| CN101227399A (en) * | 2008-01-31 | 2008-07-23 | 华为技术有限公司 | Message transmission method, system and forwarding node |
| CN101505246A (en) * | 2009-03-02 | 2009-08-12 | 中兴通讯股份有限公司 | Fault detection and recovery method for network tunnel sectional protection mode |
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