CN101388823A - Method and apparatus for establishing bidirectional flow engineering tunnel - Google Patents
Method and apparatus for establishing bidirectional flow engineering tunnel Download PDFInfo
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Abstract
The invention discloses a method for building TE tunnels of the bi-directional traffic engineering and a device, the method comprises the following steps: allocating the same bi-directional TE tunnel symbol on a first logical port of a first device and a second logical port of the second device, and allocating the source IP address and the destination address for the two logical ports, sending resource reservation protocol path RSVP PATH information with the bi-directional TE tunnel symbol and the source IP address of the first logical port to the second device by the first device, returning RSVP RESV information according to the RSVP PATH information by the second device, and then building the TE tunnels. The technical proposal of the invention greatly develops the application of the TE tunnels.
Description
Technical field
The present invention relates to the tunneling technique field, refer to set up the method and apparatus in bidirectional flow engineering (TE) tunnel especially.
Background technology
Along with the rapid growth of various application on the network and the continuous expansion of network size, for saving reasons such as IP address resource and private network safety, VPN (virtual private network) (VPN, Virtual PrivateNetwork) technology has obtained development fast, has occurred such as VPN technologies such as L3VPN, L2VPN, DVPN, VPDN.And VPN technologies be unable to do without the support of tunneling technique, therefore tunneling technique also makes rapid progress, multiprotocol label switching (mpls) tunnel, generalized routing protocol encapsulation (GRE) tunnel, IPESC tunnel and L2TP Tunnel etc. have occurred, wherein the MPLS tunnel comprises the traffic engineering (te) tunnel.
Traffic engineering tunnel all has the good technical guarantee at aspects such as the service quality that improves network, the use of optimizing Internet resources, the unusual and quick answers of protecting network, becomes the outstanding person in the tunneling technique.The traffic engineering tunnel technology is widely used in various vpn services and other important service, in business such as multimedia, video, online game and the network business.
In the tunnel of each manufacturer implementation method, the tunnel all can have logic interface corresponding with it on end node devices usually, so just easily service traffics is introduced the tunnel.If bidirectional tunnel, for example gre tunneling then all can have logic interface corresponding with it at the two ends in tunnel; And if unidirectional tunnel, then only the inlet in the tunnel has logic interface corresponding with it.And the benefit of bidirectional tunnel is significantly, and the user can regard the logic interface at two ends, tunnel as two direct-connected P2P interfaces, thus convenient variety of protocol and the business moved thereon.
Traffic engineering tunnel technical support Hot Spare and quick heavy-route (FRR) technology, customer service switches fast in the time of can guaranteeing network failure, and at Path selection, network resource optimization with provide high network quality service etc. convenient also superior than other tunneling technique, so the traffic engineering tunnel technology has obtained using widely.But traffic engineering tunnel is a unidirectional tunnel, and only cunicular inlet has logic interface corresponding with it, promptly can only send message to the tunnel from this logic interface as inlet.This point has greatly limited the application of traffic engineering tunnel.
Summary of the invention
Of the present inventionly provide two kinds of methods of setting up two-way traffic engineering tunnel, this method has greatly been expanded the application of traffic engineering tunnel.
The present invention also provides two kinds of equipment of setting up two-way traffic engineering tunnel, and this equipment has greatly been expanded the application of traffic engineering tunnel.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
The invention discloses a kind of method of setting up the bidirectional flow engineering traffic engineering tunnel, this method comprises:
Be the first logic interface two-way traffic engineering tunnel sign identical on first equipment with second logic interface configuration on second equipment; For described first logic interface and second logic interface dispose source IP address and purpose IP address respectively, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described first equipment sends RSVP path RSVP PATH message to second equipment; Wherein, carry the two-way traffic engineering tunnel sign of described first logic interface and the source IP address of described first logic interface among the described RSVP PATH;
When described first equipment receives the reserved resource agreement reservation RSVP RESV message of two-way traffic engineering tunnel sign that carries first logic interface that described second equipment returns and source IP address, determine between described first logic interface and second logic interface, to have set up two-way traffic engineering tunnel; Wherein, described RSVP RESV message is that described second equipment sends according to described RSVP PATH message.
The invention also discloses a kind of method of setting up two-way traffic engineering tunnel, this method comprises:
Be the first logic interface two-way traffic engineering tunnel sign identical on first equipment with second logic interface configuration on second equipment; For described first logic interface and second logic interface dispose source IP address and purpose IP address respectively, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described second equipment receives the RSVP PATH message of the source IP address of the two-way traffic engineering tunnel sign that carries described first logic interface and described first logic interface; Described RSVP PATH message is that described first equipment sends;
Described second equipment is judged the local logic interface with sign identical with two-way TE sign in the RSVP PATH message that whether exists; If exist, whether the purpose IP address of further judging this logic interface is identical with source IP address in the RSVP PATH message; If identical, then carry the two-way traffic engineering tunnel sign of first logic interface and the RSVP RESV message of source IP address to the transmission of second equipment.
The invention discloses a kind of equipment of setting up two-way traffic engineering tunnel, this equipment comprises: configuration module, RSVP signaling protocol module,
Described configuration module is used to first logic interface on the described equipment to dispose two-way traffic engineering tunnel sign, source IP address and purpose IP address, and configuration result is sent to RSVP signaling protocol module; Wherein, for the two-way traffic engineering tunnel of second logic interface on the two-way traffic engineering tunnel sign of described first logic interface configuration and the opposite equip. identifies identical, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described RSVP signaling protocol module is used for sending RSVP path RSVP PATH message to opposite equip., wherein, carries the two-way traffic engineering tunnel sign of described first logic interface and the source IP address of first logic interface among the described RSVP PATH; Be used for when the reserved resource agreement that receives the two-way traffic engineering tunnel sign that carries first logic interface from opposite equip. keeps RSVP RESV message, determining to have set up two-way traffic engineering tunnel between first logic interface and second logic interface.
The invention also discloses a kind of equipment of setting up two-way traffic engineering tunnel, this equipment comprises: configuration module, RSVP signaling protocol module and traffic engineering tunnel mouth administration module, wherein,
Described configuration module is used to second logic interface on the described equipment to dispose two-way traffic engineering tunnel sign, source IP address and purpose IP address, and configuration result is sent to RSVP signaling protocol module; Wherein, for the two-way traffic engineering tunnel of first logic interface on the two-way traffic engineering tunnel sign of described second logic interface configuration and the opposite equip. identifies identical, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described RSVP signaling protocol module, be used for receiving the RSVP PATH message of the source IP address of the two-way traffic engineering tunnel sign carry first logic interface and first logic interface, the two-way traffic engineering tunnel of first logic interface identified and source IP address sends to traffic engineering tunnel mouth administration module from opposite equip.; Be used for after receiving the affirmation message that traffic engineering tunnel mouth administration module sends, carry the two-way traffic engineering tunnel sign of first logic interface and the RSVP RESV message of source IP address to the opposite equip. transmission;
Traffic engineering tunnel mouth administration module, judge whether local device exists the logic interface with sign identical with the two-way traffic engineering tunnel sign of first logic interface, if exist, further judge whether the purpose IP address of this logic interface is identical with the source IP address of first logic interface, if identical, then send acknowledge message to RSVP signaling protocol module.
As seen from the above technical solution, the present invention is this to be the first logic interface two-way traffic engineering tunnel sign identical with second logic interface configuration on second equipment on first equipment, and is this two logic interface configuration source IP addresss and destination address; Described first equipment carries the two-way traffic engineering tunnel sign of described first logic interface and the RSVP path RSVP PATH message of source IP address to the transmission of second equipment; Described second equipment returns RSVP RESV message according to RSVP PATH message, thereby sets up the scheme of two-way traffic engineering tunnel, the application of greatly having expanded traffic engineering tunnel.
Description of drawings
Fig. 1 is the form schematic diagram of BIDIRECTIONAL_ATTRIBUTE in the embodiment of the invention;
Fig. 2 is the form schematic diagram of two-way traffic engineering tunnel mouth packaging information in the embodiment of the invention;
Fig. 3 is the form schematic diagram of the channel message that sends in two-way traffic engineering tunnel in the embodiment of the invention;
Fig. 4 is the first application example schematic diagram of two-way traffic engineering tunnel in the embodiment of the invention;
Fig. 5 is the second application example schematic diagram of two-way traffic engineering tunnel in the embodiment of the invention;
Fig. 6 is the first example structure block diagram of the present invention's equipment of setting up two-way traffic engineering tunnel;
Fig. 7 is a kind of second embodiment block diagram of setting up the equipment of two-way traffic engineering tunnel of the present invention.
Embodiment
The two-way traffic engineering tunnel that the present invention realizes is the expansion to existing unidirectional traffic engineering tunnel technology, and the two-way traffic engineering tunnel that the present invention realizes is still supported the correlation properties of existing unidirectional traffic engineering tunnel, characteristics such as for example, auto-bandwidth adjustment, timing re-optimization, tunnel backup and FRR.The present invention realize the concrete scheme of two-way traffic engineering tunnel comprise following some:
One, the two-way traffic engineering tunnel sign of configuration
Owing to can set up many two-way traffic engineering tunnels between two equipment, therefore need the two-way traffic engineering tunnel sign of configuration (ID), to have distinguished the different two-way traffic engineering tunnel between two equipment.The principle that disposes two-way traffic engineering tunnel sign is: two traffic engineering tunnel logic interfaces of this locality of an equipment can not be configured to have identical two-way traffic engineering tunnel sign; On two equipment, have only two identical tunnel logic eloquence of two-way traffic engineering tunnel sign can become a pair of direct-connected P2P bidirectional tunnel mouth.
In one embodiment of the invention, on the tunnel logic interface, increase " mpls te bidirection idvalue " order line, be used for this traffic engineering tunnel logic interface is enabled to distribute two-way traffic engineering tunnel sign for two-way traffic engineering tunnel logic interface and for it.
Two, configuration source IP address
Existing traffic engineering tunnel is unidirectional, so does not need to dispose source IP address under the tunnel logic interface.But in the present invention, enable, just need the configuration source IP address, also need configuration purpose IP address certainly to behind the bidirectional tunnel logic interface.This is to be exactly because two tunnel logic interfaces can become another smallclothes of a pair of direct-connected P2P bidirectional tunnel mouth: the source and destination IP address of these two tunnel logic interfaces must be corresponding mutually, the source IP address that is one of them tunnel logic interface is the purpose IP address of another tunnel logic interface, and vice versa.
Three, extended resources reservation protocol (RSVP) signaling protocol is to support two-way traffic engineering tunnel
In order to support two-way traffic engineering tunnel, need to expand the PSVP signaling protocol among the present invention, make RSVP path (RSVP PATH) message and RSVP keep and can both carry two-way traffic engineering tunnel sign in (RSVP RESV) message.
In an embodiment of the present invention, in RSVP PATH message and RSVP RESV message, increase a bi-directional nature (BIDIRECTIONAL_ATTRIBUTE) object, and the two-way traffic engineering tunnel sign of in the shared field of this BIDIRECTIONAL_ATTRIBUTE object, filling in head end logic interface mouth, need set up two-way traffic engineering tunnel to show.In one embodiment of the invention, the Tag attribute of BIDIRECTIONAL_ATTRIBUTE is Class=208, C-Type=1; What wherein Class-Num used is " 11bbbbbb " type (referring to RFC2205), if promptly there is intermediate equipment not to be familiar with the Class of this type, also can directly transmits it and can not change it; The Value attribute of BIDIRECTIONAL_ATTRIBUTE object, promptly content takies four bytes, and its form is as shown in Figure 1.
Fig. 1 is the form schematic diagram of BIDIRECTIONAL_ATTRIBUTE in the embodiment of the invention.Referring to Fig. 1, most significant bit M represents the mode of operation of current bidirectional tunnel logic interface, if M be 0 expression be operated under three layer models, if M be 1 expression be operated under two layer models; Reserved field after the M; It after the reserved field two-way traffic engineering tunnel sign; Respectively accounting for what bytes as for reserved field and two-way traffic engineering tunnel sign can decide according to actual conditions.
Go back extended error type (ERROR_SPEC) object in addition in the embodiment of the invention, increase the relevant error code of two-way traffic engineering tunnel, be specially expansion Error Code and be No. 24 " Routing Problem ", increase No. 11 error code:
1 Bad?EXPLICIT_ROUTE?object
2 Bad?strict?node
3 Bad?loose?node
4 Bad?initial?sub-object
5 No?route?available?toward?destination
6 Unacceptable?label?value
7 RRO?indicated?routing?loops
8 MPLS?being?negotiated，but?a?non-RSVP-capable?router?stands in?the?path
9 MPLS?label?allocation?failure
10 Unsupported?L3PID
11 Unsupported?Bidirectional?Tunnel
Wherein, the two-way traffic engineering tunnel of No. 11 error codes " Unsupported Bidirectional Tunnel " expression is set up failure, is error code newly-increased in the embodiment of the invention.
Based on above-mentioned some, be that example is further detailed technical scheme of the present invention next to set up a concrete two-way traffic engineering tunnel.
There is logic interface a in this example on the device A, has logic interface b on the equipment B:
According to the solution of the present invention, at first utilize " mpls te bidirection id value " order to be the logic interface a two-way traffic engineering tunnel sign identical with logic interface b configuration, and dispose source IP address and purpose IP address respectively for logic interface a and logic interface b, and the source IP address of logic interface a is configured to the purpose IP address of logic interface b, the source IP address of logic interface b is configured to the purpose IP address of logic interface a; Enable logic a and logic interface b are two-way traffic engineering tunnel logic interface respectively on device A and equipment B.Processing afterwards is as follows:
Processing on a, the device A
After having enabled TE bidirectional tunnel function and submission on the device A, the RSVP tunnel can rebuild.Device A sends RSVP PATH message to equipment B, carries the two-way traffic engineering tunnel sign of logic interface a and the source IP address of logic interface a in this RSVP PATH message.Wherein, the two-way traffic engineering tunnel sign of logic interface a is carried in the BIDIRECTIONAL_ATTRIBUTE object of RSVP PATH message, and also carries the mode of operation sign in the BIDIRECTIONAL_ATTRIBUTE object, specifically can be as shown in Figure 1; The source IP address of logic interface a then is carried in the expansion Tunnel Identifier EXTENDED TUNNEL id field in the session SESSION object in the RSVP PATH message.This RSVPPATH message is delivered on the equipment B.
When device A has received the RSVP RESV message of returning in the downstream, if carry the BIDIRECTIONAL_ATTRIBUTE object in this RSVP RESV message, and the content in this object does not change, and then definite pairing two-way traffic engineering tunnel of logic interface a is set up.Here, RSVP RESV message is that equipment B sends according to described RSVP PATH message, and this point is described below.
Processing on b, the equipment B
Equipment B receives the RSVP PATH message from device A, and this RSVP PATH message carries the BIDIRECTIONAL_ATTRIBUTE object, confirm that then opposite equip. (being device A) will set up two-way traffic engineering tunnel, at this moment, the RSVP signaling protocol module in the equipment B is confirmed following flow process to TE logical tunnel mouth administration module:
1) searches the logic interface that this locality enables the TE bidirectional tunnel, judge whether to exist logic interface with sign identical with two-way TE sign in the BIDIRECTIONAL_ATTRIBUTE object in the RSVPPATH message, and the mode of operation of this logic interface is identical with mode of operation sign in the BIDIRECTIONAL_ATTRIBUTE object, if exist then the follow-up step 2 of continuation execution), if there is no then use RSVP path error RSVP PATH ERROR message, return " UnsupportedBidirectional Tunnel " error code.
2) judge whether the source IP address in the expansion Tunnel Identifier EXTENDED TUNNEL id field in the SESSION object is identical with the purpose IP address of this logic interface in the RSVP PATH message, if it is identical, then return RSVP RESV message to opposite equip., and set up the relevant list item of two-way traffic engineering tunnel at forwarding plane, and the MPLS label of the non-NULL that carries same BIDIRECTIONAL_ATTRIBUTE object in the RSVP RESV message and distribute for this two-way traffic engineering tunnel has so far successfully been set up the two-way traffic engineering tunnel between logic interface a and the b; If inequality, then use RSVP PATH ERROR message, return " Unsupported BidirectionalTunnel " error code.
The processing of b, intermediate equipment (being other equipment between device A and the B)
In embodiments of the present invention, the two-way traffic engineering tunnel function of not perception of intermediate equipment if carried the BIDIRECTIONAL_ATTRIBUTE object in the RSVP PATH message that these intermediate equipments are received, then directly continues to transmit this object and gets final product.
The two-way traffic engineering tunnel of in above embodiment, successfully setting up, however the two-way traffic engineering tunnel in the middle of actual need support multi-protocol stack could adapt to more applications.Give the 4th following scheme among the present invention for this reason.
Four, expansion MPLS data message is to support multi-protocol stack
In embodiments of the present invention, in order to make two-way traffic engineering tunnel support multi-protocol stack also the MPLS data message to be expanded.
Because will make two-way traffic engineering tunnel mouth support multi-protocol stack, therefore the data message that receives from the bidirectional tunnel logic interface need be known its protocol type information.Therefore at message source, when two-way traffic engineering tunnel sends datagram, know the protocol type information of data message earlier, the protocol type information of data message and data message is packaged into to send again by two-way traffic engineering tunnel behind the channel message then and sends this channel message.
Fig. 2 is the form schematic diagram of two-way traffic engineering tunnel mouth packaging information in the embodiment of the invention.As shown in Figure 2, two-way traffic engineering tunnel mouth packaging information is 4 bytes altogether in the present embodiment, and wherein except 2 shared bytes of protocol type information, remaining 2 byte is reserved fields.Certainly in other embodiments of the invention, the total bytes of two-way traffic engineering tunnel mouth packaging information and wherein shared byte number and the shared byte number of reserved field of protocol type information can decide according to actual conditions.
In Fig. 2, the definition of protocol type information can be identical with the definition of the protocol type in the ethernet link layer head.For example, IPv4 is 0x0800, and IPv6 is 0x86DD, and IPX is 0x8137, and the MPLS message is 0x8847 etc.
In addition, with the MPLS label that keeps,, indicate two-way traffic engineering tunnel mouth packaging information in an embodiment of the present invention as label 15.Fig. 3 is the form schematic diagram of the channel message that sends in two-way traffic engineering tunnel in the embodiment of the invention.As shown in Figure 3, the innermost layer of channel message (being the rightmost side in Fig. 3) is the payload of message; Next is two-way traffic engineering tunnel mouth packaging information (being the content shown in Fig. 2); Being the bidirectional tunnel label once more, is example with label 15 here; Be the Crlsp tunnel label then; Outermost layer is two layers of link packaging information.
In Fig. 3, bidirectional tunnel label and two-way traffic engineering tunnel mouth packaging information are the contents that increases in the tunneling data heading in the embodiment of the invention, and Crlsp tunnel label and two layers of link packaging information are existing contents in the data tunnel heading in the existing unidirectional traffic engineering tunnel.But need to prove, in the channel message head that tail end equipment received of existing unidirectional traffic engineering tunnel, content in the Crlsp tunnel label is the sky label, and be in the channel message that tail end equipment received in embodiments of the present invention, the Crlsp tunnel label is the non-NULL label that this tail end equipment distributes for this two-way traffic engineering tunnel, have only the label by this non-NULL, the tail end equipment of two-way traffic engineering tunnel could be with message and the receive logic mouth correspondence of receiving.
Based on the 4th above-mentioned scheme, next provide the data message handling process of forwarding plane below.Here be that example describes still with the device A and the equipment B at two-way traffic engineering tunnel two ends:
Device A is when two-way traffic engineering tunnel AB sends datagram, and obtains the protocol type information of this data message earlier according to prior art, sends after then data message being packaged into channel message by form shown in Figure 3 again.
Equipment B is carried out following processing according to content wherein when two-way traffic engineering tunnel is received channel message:
A1, elder generation handle two layers of link packaging information according to prior art;
A2, basis are based on the label switched path (Crlsp that retrains, Constraint-based LabelSwitched Path) tunnel label is searched into label mapping (ILM, Incoming Label Map) list item, the ILM list item shows that this label is the label of going into of traffic engineering tunnel logic interface correspondence, and preserve its Ifindex, this label is carried out the POP operation;
A3, the follow-up bidirectional tunnel label of analysis if this bidirectional tunnel label is a Hold sticker 15, show that then 4 follow-up bytes are two-way traffic engineering tunnel mouth packaging information, carry out follow-up step a4; If this bidirectional tunnel label is not a Hold sticker 15, then transmits handling process and handle according to original MPLS in the unidirectional traffic engineering tunnel;
A4, resolve 4 byte content after the Hold sticker 15, and, channel message is submitted to the corresponding protocol stack handles according to wherein protocol type information.
Based on the foregoing description as seen, not only can set up two-way traffic engineering tunnel, and the two-way traffic engineering tunnel of setting up can also be supported multi-protocol stack according to technical scheme of the present invention.
What also need here to illustrate a bit is, the two-way traffic engineering tunnel of setting up among the present invention can realize forward compatibility, be that the two-way traffic engineering tunnel of setting up among the present invention can be supported former unidirectional traffic engineering tunnel original functional property, as bandwidth adjust automatically, characteristics such as re-optimization, tunnel backup, FRR regularly.On the logic interface that has enabled two-way traffic engineering tunnel, if set up backup tunnel, perhaps in order to support business such as re-optimization and auto-bandwidth adjustment to carry out the MakeBeforeBreak operation, its newly-built Crlsp tunnel all will carry the BIDIRECTIONAL_ATTRIBUTE object, and Crlsp and the local TE bidirectional tunnel mouth that many upstreams can be set up at the equipment of tunnel tail-end connect, promptly the next message of many Crlsp that set up from the upstream can both be handled as the message that the two-way traffic engineering tunnel mouth in this locality receives.So just make two-way traffic engineering tunnel support characteristics such as automatic adjustment, timing re-optimization, tunnel backup, FRR naturally.
The invention enables TE can support two-way traffic engineering tunnel, the equipment of such two wide aparts can be crossed over public network, uses TE to set up the P2P logic interfacing of direct connection, and moves various protocols stacks such as IPv4, IPv6, IPX thereon.This just makes that variety of protocol and business can be more easily in TE bidirectional tunnel mouth deploy, and can fully enjoy the high quality services that TE brings, good network resource optimization, high reliability guarantee.
Two-way traffic engineering tunnel can greatly facilitate the user in practical application, provides the several examples of application of two-way traffic engineering tunnel below.
Application example 1
Fig. 4 is the first application example schematic diagram of two-way traffic engineering tunnel in the embodiment of the invention.Referring to Fig. 4, for the two-way traffic engineering tunnel mouth in the public network, can directly enable Routing Protocol thereon, directly move agreements such as LDP, thereby simplified the realization of operation LDP agreement on traffic engineering tunnel.This has certain difficulty for GRE, because the foundation of GRE is depend on route unimpeded, if moved Routing Protocol on GRE bidirectional tunnel mouth, the route that gre tunneling relied on just becomes and has walked GRE bidirectional tunnel mouth probably, and gre tunneling will soon fall by Down like this.For TE bidirectional tunnel mouth, also do not support now to move MPLS TE thereon, that is to say that the link between the TE bidirectional tunnel logic interface can not be added into the TEDB database, just there has not been this problem yet
Application example 2
Fig. 5 is the second application example schematic diagram of two-way traffic engineering tunnel in the embodiment of the invention.Referring to Fig. 5, under the VPN networking, also can rely on two-way traffic engineering tunnel mouth and on two PE equipment, set up the bidirectional tunnel of crossing over public network, then tunnel, two ends logic interface is tied among the route forwarding table VRF of private network and move Routing Protocol, realize an easy VPN scheme thus.Simultaneously, on the bidirectional tunnel mouth, move the LDP agreement, also can obtain to connect the MPLS LDP LSP of different VPN website easily, make the networking plans such as operator of operator easily to dispose.If on this bidirectional tunnel logic interface, move multicast routing protocol, also just can dispose a fairly simple multicasting VPN.
Application example 3
TE bidirectional tunnel mouth is that two-way forwarding detection (BFD) detection provides convenience.BFD detects the individual event lsp tunnel, its oppositely control message can walk IP and transmit also can walk the tunnel and transmit, if particular arrangement not, its road of oppositely controlling message is through being uncertain, promptly walk different paths with forward control message, reverse path goes wrong and may cause flase drop like this.But two-way traffic engineering tunnel has not just had this problem, and BFD control message back and forth all is directly to walk the tunnel.For example two-way traffic engineering tunnel logic interface has disposed the IP address, so just can directly use IP BFD to detect the IP address of direct connection logic interface, if two-way traffic engineering tunnel logic interface operates under two layers of port mode, there is not the IP address, just can be directly on the logic interface of both sides the MPLS BFD of configuring static detect, perhaps use dynamic MPLS BFD to detect, flase drop can not occur.
Next provide the composition frame chart of the equipment of setting up two-way traffic engineering tunnel among the present invention.
Fig. 6 is the first example structure block diagram of the present invention's equipment of setting up two-way traffic engineering tunnel.As shown in Figure 6, this equipment comprises: configuration module 601 and RSVP signaling protocol module 602, wherein:
RSVP signaling protocol module 602 is used for sending RSVP path RSVPPATH message to opposite equip., wherein, carries the two-way traffic engineering tunnel sign of described first logic interface and the source IP address of first logic interface among the described RSVP PATH; Be used for when the reserved resource agreement that receives the two-way traffic engineering tunnel sign that carries first logic interface from opposite equip. keeps RSVP RESV message, determining to have set up two-way traffic engineering tunnel between first logic interface and second logic interface.
In Fig. 6, RSVP signaling protocol module 602, be used for increasing bi-directional nature BIDIRECTIONAL_ATTRIBUTE object in described RSVP PATH message, and the two-way traffic engineering tunnel sign of in the shared field of this BIDIRECTIONAL_ATTRIBUTE object, filling in described first logic interface, fill in the source IP address of described first logic interface in the expansion Tunnel Identifier EXTENDED TUNNEL id field in the session SESSION object in described RSVP PATH message, send described RSVP PATH message to opposite equip. then.
Equipment as shown in Figure 6 further comprises: the data message processing module, in Fig. 6, do not draw.This data message processing module is used for when opposite equip. sends datagram, and sends this channel message again after the protocol type information of data message and data message is packaged into channel message; Also further carry content indication information in the described channel message; This content indication information is used for indicating the protocol type information of channel message.
Fig. 7 is a kind of second embodiment block diagram of setting up the equipment of two-way traffic engineering tunnel of the present invention.As shown in Figure 7, this equipment comprises: configuration module 701, RSVP signaling protocol module 702 and traffic engineering tunnel mouth administration module 703, wherein:
RSVP signaling protocol module 702, be used for receiving the RSVP PATH message of the source IP address of the two-way traffic engineering tunnel sign carry first logic interface and first logic interface, the two-way traffic engineering tunnel of first logic interface identified and source IP address sends to traffic engineering tunnel mouth administration module 703 from opposite equip.; Be used for after receiving the affirmation message that traffic engineering tunnel mouth administration module 703 sends, carry the two-way traffic engineering tunnel sign of first logic interface and the RSVP RESV message of source IP address to the opposite equip. transmission;
Traffic engineering tunnel mouth administration module 703, judge whether local device exists the logic interface with sign identical with the two-way traffic engineering tunnel sign of first logic interface, if exist, further judge whether the purpose IP address of this logic interface is identical with the source IP address of first logic interface, if identical, then send acknowledge message to RSVP signaling protocol module 702.
In Fig. 7, traffic engineering tunnel mouth administration module 703 is further used for when judging local device and do not have the logic interface with sign identical with the two-way TE sign of first logic interface, sends to RSVP signaling protocol module 702 and denies message; Perhaps, judge the source IP address of the purpose IP address of this logic interface and first logic interface when inequality, send to RSVP signaling protocol module 702 and deny message;
RSVP signaling protocol module 702, be further used for receive that traffic engineering tunnel mouth administration module 703 sends deny message after, send RSVP PATH ERROR message to opposite equip.; Carry the two-way traffic engineering tunnel of expression in this RSVPPATH ERROR message and set up the error code of failure.
Equipment as shown in Figure 7 further comprises: the data message processing module, in Fig. 7, do not draw.This data message processing module, after being used for receiving channel message from the traffic engineering tunnel of setting up, determine according to protocol type information channel message to be sent to protocol type information in the channel message corresponding protocol stack and handle according to the content indication information in the channel message.
In sum, the present invention is this to be the first logic interface two-way traffic engineering tunnel sign identical with second logic interface configuration on second equipment on first equipment, and is this two logic interface configuration source IP addresss and destination address; Described first equipment carries the two-way traffic engineering tunnel sign of described first logic interface and the RSVP path RSVP PATH message of source IP address to the transmission of second equipment; Described second equipment returns RSVP RESV message according to RSVP PATH message, thereby sets up the scheme of two-way traffic engineering tunnel, the application of greatly having expanded traffic engineering tunnel.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1, a kind of method of setting up the bidirectional flow engineering traffic engineering tunnel is characterized in that, this method comprises:
Be the first logic interface two-way traffic engineering tunnel sign identical on first equipment with second logic interface configuration on second equipment; For described first logic interface and second logic interface dispose source IP address and purpose IP address respectively, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described first equipment sends RSVP path RSVP PATH message to second equipment; Wherein, carry the two-way traffic engineering tunnel sign of described first logic interface and the source IP address of described first logic interface among the described RSVP PATH;
When described first equipment receives the reserved resource agreement reservation RSVP RESV message of two-way traffic engineering tunnel sign that carries first logic interface that described second equipment returns and source IP address, determine between described first logic interface and second logic interface, to have set up two-way traffic engineering tunnel; Wherein, described RSVP RESV message is that described second equipment sends according to described RSVP PATH message.
2, the method for claim 1 is characterized in that, carries the two-way traffic engineering tunnel sign of described first logic interface and the source IP address of described first logic interface in the described RSVP PATH message and comprises:
In described RSVP PATH message, increase bi-directional nature BIDIRECTIONAL_ATTRIBUTE object, and in the shared field of this BIDIRECTIONAL_ATTRIBUTE object, fill in the two-way traffic engineering tunnel sign of described first logic interface;
Fill in the source IP address of described first logic interface in the expansion Tunnel Identifier EXTENDED TUNNEL id field in the session SESSION object in described RSVP PATH message.
3, method as claimed in claim 2 is characterized in that, further carries the mode of operation sign in the RSVPPATH message that described first equipment sends; Described mode of operation sign is used to represent that described first logic interface is operated under three layer models or under two layer models; Described mode of operation sign fills in the shared field of described BIDIRECTIONAL_ATTRIBUTE object.
4 as each described method in the claim 1 to 3, it is characterized in that this method further comprises:
When described first equipment sends datagram to the two-way traffic engineering tunnel of described foundation, send this channel message again after the protocol type information of data message and data message is packaged into channel message;
Also further carry content indication information in the described channel message; This content indication information is used for indicating the protocol type information of channel message.
5, a kind of method of setting up two-way traffic engineering tunnel is characterized in that, this method comprises:
Be the first logic interface two-way traffic engineering tunnel sign identical on first equipment with second logic interface configuration on second equipment; For described first logic interface and second logic interface dispose source IP address and purpose IP address respectively, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described second equipment receives the RSVP PATH message of the source IP address of the two-way traffic engineering tunnel sign that carries described first logic interface and described first logic interface; Described RSVP PATH message is that described first equipment sends;
Described second equipment is judged the local logic interface with sign identical with two-way TE sign in the RSVP PATH message that whether exists; If exist, whether the purpose IP address of further judging this logic interface is identical with source IP address in the RSVP PATH message; If identical, then carry the two-way traffic engineering tunnel sign of first logic interface and the RSVP RESV message of source IP address to the transmission of second equipment.
6, method as claimed in claim 5 is characterized in that, this method further comprises:
If described second equipment is judged the local logic interface with sign identical with two-way TE sign in the RSVP PATH message that do not exist, then second equipment sends RSVP path error RSVP PATH ERROR message to first equipment; Carry the two-way traffic engineering tunnel of expression in this RSVP PATH ERROR message and set up the error code of failure;
Perhaps, inequality if described second equipment is judged the purpose IP address and the source IP address in the RSVP PATH message of this logic interface, then second equipment sends RSVP PATH ERROR message to first equipment; Carry the two-way traffic engineering tunnel of expression in this RSVP PATH ERROR message and set up the error code of failure.
7, method as claimed in claim 5 is characterized in that,
Further carry the mode of operation sign in the RSVP PATH message that described second equipment receives; Described mode of operation sign is used to represent that described first logic interface is operated under three layer models or under two layer models;
Described second equipment judge local have logic interface with sign identical with two-way TE sign in the RSVP PATH message after, whether the mode of operation of further judging this logic interface identical with the mode of operation sign of carrying in the RSVPPATH message; If, then carry out the described purpose IP address of judging this logic interface whether with RSVP PATH message in the identical step of source IP address.
8, method as claimed in claim 5 is characterized in that, further carries the multiprotocol label switching MPLS label of the non-NULL that the two-way traffic engineering tunnel of promising described foundation distributes in the RSVPRESV message that described second equipment sends.
9, as each described method in the claim 5 to 8, it is characterized in that this method further comprises:
After described second equipment receives channel message from the two-way traffic engineering tunnel of setting up, determine according to protocol type information channel message to be sent to protocol type information in the channel message corresponding protocol stack and handle according to the content indication information in the channel message head.
10, a kind of equipment of setting up two-way traffic engineering tunnel is characterized in that, this equipment comprises: configuration module, RSVP signaling protocol module,
Described configuration module is used to first logic interface on the described equipment to dispose two-way traffic engineering tunnel sign, source IP address and purpose IP address, and configuration result is sent to RSVP signaling protocol module; Wherein, for the two-way traffic engineering tunnel of second logic interface on the two-way traffic engineering tunnel sign of described first logic interface configuration and the opposite equip. identifies identical, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described RSVP signaling protocol module is used for sending RSVP path RSVP PATH message to opposite equip., wherein, carries the two-way traffic engineering tunnel sign of described first logic interface and the source IP address of first logic interface among the described RSVP PATH; Be used for when the reserved resource agreement that receives the two-way traffic engineering tunnel sign that carries first logic interface from opposite equip. keeps RSVP RESV message, determining to have set up two-way traffic engineering tunnel between first logic interface and second logic interface.
11, equipment as claimed in claim 10 is characterized in that,
Described RSVP signaling protocol module, be used for increasing bi-directional nature BIDIRECTIONAL_ATTRIBUTE object in described RSVP PATH message, and the two-way traffic engineering tunnel sign of in the shared field of this BIDIRECTIONAL_ATTRIBUTE object, filling in described first logic interface, fill in the source IP address of described first logic interface in the expansion Tunnel Identifier EXTENDED TUNNEL id field in the session SESSION object in described RSVP PATH message, send described RSVP PATH message to opposite equip. then.
12, as claim 10 or 11 described equipment, it is characterized in that, this equipment further comprises: the data message processing module, be used for when opposite equip. sends datagram, and after being packaged into channel message, the protocol type information of data message and data message sends this channel message again; Also further carry content indication information in the described channel message; This content indication information is used for indicating the protocol type information of channel message.
13, a kind of equipment of setting up two-way traffic engineering tunnel is characterized in that, this equipment comprises: configuration module, RSVP signaling protocol module and traffic engineering tunnel mouth administration module, wherein,
Described configuration module is used to second logic interface on the described equipment to dispose two-way traffic engineering tunnel sign, source IP address and purpose IP address, and configuration result is sent to traffic engineering tunnel mouth administration module; Wherein, for the two-way traffic engineering tunnel of first logic interface on the two-way traffic engineering tunnel sign of described second logic interface configuration and the opposite equip. identifies identical, and the source IP address of first logic interface is the purpose IP address of second logic interface, and the source IP address of second logic interface is the purpose IP address of first logic interface;
Described RSVP signaling protocol module, be used for receiving the RSVP PATH message of the source IP address of the two-way traffic engineering tunnel sign carry first logic interface and first logic interface, the two-way traffic engineering tunnel of first logic interface identified and source IP address sends to traffic engineering tunnel mouth administration module from opposite equip.; Be used for after receiving the affirmation message that traffic engineering tunnel mouth administration module sends, carry the two-way traffic engineering tunnel sign of first logic interface and the RSVP RESV message of source IP address to the opposite equip. transmission;
Traffic engineering tunnel mouth administration module, judge whether local device exists the logic interface with sign identical with the two-way traffic engineering tunnel sign of first logic interface, if exist, further judge whether the purpose IP address of this logic interface is identical with the source IP address of first logic interface, if identical, then send acknowledge message to RSVP signaling protocol module.
14, equipment as claimed in claim 13 is characterized in that,
Described traffic engineering tunnel mouth administration module is further used for when judging local device and do not have the logic interface with sign identical with the two-way TE sign of first logic interface, sends to RSVP signaling protocol module and denies message; Perhaps, judge the source IP address of the purpose IP address of this logic interface and first logic interface when inequality, send to RSVP signaling protocol module and deny message;
Described RSVP signaling protocol module, be further used for receive that traffic engineering tunnel mouth administration module sends deny message after, send RSVP PATH ERROR message to opposite equip.; Carry the two-way traffic engineering tunnel of expression in this RSVP PATHERROR message and set up the error code of failure.
15, as claim 13 or 14 described equipment, it is characterized in that, this equipment further comprises: the data message processing module, after being used for receiving channel message from the traffic engineering tunnel of setting up, determine according to protocol type information channel message to be sent to protocol type information in the channel message corresponding protocol stack and handle according to the content indication information in the channel message.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102255527A CN101388823A (en) | 2008-11-05 | 2008-11-05 | Method and apparatus for establishing bidirectional flow engineering tunnel |
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| CNA2008102255527A CN101388823A (en) | 2008-11-05 | 2008-11-05 | Method and apparatus for establishing bidirectional flow engineering tunnel |
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| CN101388823A true CN101388823A (en) | 2009-03-18 |
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