CN103595628A - Method and device for saving FRR protection resources - Google Patents
Method and device for saving FRR protection resources Download PDFInfo
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- CN103595628A CN103595628A CN201310571867.8A CN201310571867A CN103595628A CN 103595628 A CN103595628 A CN 103595628A CN 201310571867 A CN201310571867 A CN 201310571867A CN 103595628 A CN103595628 A CN 103595628A
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Abstract
The invention provides a method and device for saving FRR protection resources. The method comprises the steps that firstly, a head node judges whether a current CRLSP or MPLS TE tunnel needs FRR protection or not; secondly, when the head node judges that the current CRLSP or MPLS TE tunnel needs the FRR protection, a message carrying a preset label is sent to the current CRLSP or MPLS TE tunnel to inform a local restoring node PLR on the CRLSP or MPLS TE tunnel to establish an FRR. According to the technical scheme, the FRR protection is only established for the CRLSP or MPLS TE tunnel needing the FRR protection, and network resources can be effectively saved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and device of the FRR of saving reserved resource.
Background technology
MPLS(Multi-Protocol Label Switching, multiprotocol label switching) TE (Traffic Engineering, traffic engineering) combine MPLS technology and traffic engineering, by setting up the LSP(Label Switched Path along specified path, label switched path) tunnel carries out resource reservation, makes network traffics get around congested node, reaches the object of balancing network flow, wherein, MPLS traffic engineering tunnel is a virtual point-to-point connection from head node to destination node.Generally; MPLS traffic engineering tunnel is by a CRLSP(Constraint-based Routed Label Switched Paths; LSP based on constraint route) form; in practical application; for improving the reliability of MPLS traffic engineering tunnel transfer of data; sometimes also need to set up many CRLSP or set up two tunnels for same flow, so many MPLS traffic engineering tunnel protection groups that tunnel forms.
The in the situation that of single MPLS traffic engineering tunnel protection flow, conventionally can guarantee the reliability of same traffic transport by creating CRLSP backup mode, in this case, MPLS traffic engineering tunnel consists of one group of CRLSP.When node perceived is unavailable to main CRLSP right overhead, flow switch is upper to backup CRLSP, after recovering, main CRLSP path again flow switch is returned, to realize the backup protection to main CRLSP.CRLSP backup creates backup CRLSP after referring to create main CRLSP immediately.When main CRLSP lost efficacy, directly by flow switch to backing up CRLSP, be that the main CRLSP of whole piece path is protected, its switch speed is slower than FRR, therefore, sometimes also needs for CRLSP sets up FRR(Fast Reroute, fast heavy-route) protect.FRR is the technology of network localised protection that realizes in MPLS TE, only crucial link or node is protected.Open after the FRR function in tunnel, when certain link on protected CRLSP or certain node failure, flow can be switched to as forwarding on the Bypass CRLSP of FRR.In addition, when creating the protection of two or more MPLS traffic engineering tunnels for same flow, similar with the course of work of single MPLS traffic engineering tunnel with a plurality of CRLSP, main tunnel is wherein equivalent to above-mentioned main CRLSP, and backup tunnel is equivalent to back up CRLSP.
Referring to Fig. 1, in the active and standby CRLSP environment of typical single traffic engineering tunnel and the environment of FRR networking, Router1 is head node, and Router2 is the local PLR of reparation node, and Router4 is tail node, wherein, head node is the Ingress node in tunnel, the Egress node of tail node, and middle node is intermediate node, PLR node is the node that need to set up for the CRLSP in tunnel FRR protection, is also the head node of the FRR Protection path of foundation, between Router1 and Router4, set up MPLS traffic engineering tunnel, wherein path A->B->C is the main CRLSP of MPLS traffic engineering tunnel, D->E->F is the backup CRLSP of MPLS traffic engineering tunnel, head node Router1 regularly respectively transmit path Path message active and standby part CRLSP is carried out to route maintenance, Path message is sent along the direction of data-message transmission downstream by sender, storing path state on all nodes on the way, Path message is used for bang path state information to safeguard CRLSP path.PLR node R outer2 is Point of Local Repair, for setting up FRR protection, the downstream node to Point of Local Repair conventionally, or and downstream node between link establishment FRR Protection path, this Protection path also can be described as bypass Bypass CRLSP.
When carrying out traffic forwarding, MPLS traffic engineering tunnel conventionally there are two kinds of forward modes of 1:1 forward mode and 1+1 forward mode.When adopting 1:1 forward mode, data traffic only forwards on the main CRLSP of MPLS traffic engineering tunnel, and after the main CRLSP fault of MPLS traffic engineering tunnel, flow switch is to upper forwarding of backup CRLSP of MPLS traffic engineering tunnel; When being adopted as 1+1 forward mode, flow forwards by the mode of load balancing simultaneously on the active and standby CRLSP of MPLS traffic engineering tunnel.Between two kinds of patterns, can change.The active and standby CRLSP of MPLS traffic engineering tunnel passes through same equipment Router2 simultaneously; link B on Router2 and E are crucial links; need to lay special stress on protecting; open FRR protection; once after B and E link simultaneous faults; flow through Router2 will be switched to Bypass CRLSP forwarding, walk path GH and forward.
At present; when MPLS traffic engineering tunnel is set up FRR protection; need to be simultaneously for each CRLSP in MPLS traffic engineering tunnel sets up FRR; need in network, be the reserved a plurality of FRR reserved resources of each CRLSP; and when MPLS traffic engineering tunnel is operated in 1:1 forward mode, due to synchronization, flow only can transmit in a CRLSP; the FRR not carrying out on the CRLSP of traffic transport will be inoperative, and this will inevitably cause network resources waste.For example; in the time of need to setting up FRR to MPLS TE; suppose that MPLS TE comprises main CRLSP and two links of backup CRLSP; so just need to reserve the reserved resource of two parts of FRR simultaneously; if FRR reserved resource is 100M; this just need to take 200M resource; and in fact; when MPLS TE is operated in 1:1 pattern; the upper reserved FRR reserved resource of one of them CRLSP does not have any effect; because when a CRLSP carries out traffic transport, another CRLSP can't carry out traffic transport, and this just causes the waste of the FRR reserved resource of 100M.Similarly; referring to Fig. 2; in set up the MPLS traffic engineering tunnel protection group of a plurality of MPLS traffic engineering tunnels for same flow; also there is similar problem; for example; there is the protection group of main MPLS traffic engineering tunnel and backup MPLS traffic engineering tunnel when setting up FRR protection, if protecting tunnel group is operated in 1:1 pattern, for two tunnels of backup, sets up FRR simultaneously and also can cause the waste of resource.
Summary of the invention
In view of this; the invention provides a kind of method of saving quick heavy-route FRR reserved resource; be applied on the head node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP, and described method comprises:
Head node judges whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Described head node is judged when described current C RLSP or MPLS traffic engineering tunnel need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the Point of Local Repair PLR noticing in described current C RLSP or MPLS traffic engineering tunnel, set up FRR.
In above-mentioned method, described default mark specifically can be a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.
In above-mentioned method, described default mark is specifically carried in path P ath message.
In above-mentioned method, described head node judges that whether current C RLSP or MPLS traffic engineering tunnel need FRR protection, specifically can be:
When described head node need to arrive current C RLSP or MPLS traffic engineering tunnel by flow switch, judge that current C RLSP or MPLS TE need FRR protection;
When described head node need to be switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel by flow, judge that current C RLSP or MPLS TE do not need FRR protection.
Above-mentioned method also can comprise:
Described head node is judged when described current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in described CRLSP or MPLS traffic engineering tunnel, remove the FRR having set up.
The present invention also provides a kind of householder method of the FRR of saving reserved resource; be applied on the PLR node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP, and described method comprises:
The message that carries default mark that PLR node Receiver node sends, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Described PLR node is judged when current C RLSP or MPLS traffic engineering tunnel need FRR protection, in current C RLSP or MPLS traffic engineering tunnel, is set up FRR.
In above-mentioned method, describedly in current C RLSP or MPLS traffic engineering tunnel, set up FRR and specifically can be:
By the FRR for the protection of same MPLS traffic engineering tunnel or same MPLS traffic engineering tunnel group having set up on described PLR node and current C RLSP or the binding of MPLS traffic engineering tunnel.
The present invention also provides a kind of device of the FRR of saving reserved resource; be applied on the head node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP, and described device comprises:
Protection identifying unit, for judging whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Packet labeling unit; be used for when described protection identifying unit judges that current C RLSP or MPLS traffic engineering tunnel need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the Point of Local Repair PLR noticing in described current C RLSP or MPLS traffic engineering tunnel, set up FRR.
In above-mentioned device, described default mark specifically can be a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.
In above-mentioned device, described default mark is specifically carried in Path message.
In above-mentioned device, described protection identifying unit, while specifically can be used for flow switch to be arrived to current C RLSP or MPLS traffic engineering tunnel, judges that current C RLSP or MPLS TE need FRR protection; And while flow being switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel for needs, judge that current C RLSP or MPLS TE do not need FRR protection.
Above-mentioned device also can comprise:
Remove notification unit; when described protection identifying unit judges that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in described CRLSP or MPLS traffic engineering tunnel, remove the FRR having set up.
The present invention also provides a kind of servicing unit of the FRR of saving reserved resource; be applied on the PLR node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP, and described device comprises:
Mark identifying unit, the message that carries default mark sending for Receiver node, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Unit is set up in protection, when judging that when mark identifying unit current C RLSP or MPLS traffic engineering tunnel need FRR to protect, in current C RLSP or MPLS traffic engineering tunnel, sets up FRR.
In above-mentioned device, unit is set up in described protection, specifically can be used for the FRR for the protection of same MPLS traffic engineering tunnel or same MPLS traffic engineering tunnel group having set up on described PLR node and current C RLSP or the binding of MPLS traffic engineering tunnel.
In embodiment of the present invention technical scheme; the head node of MPLS traffic engineering tunnel can be by determining whether current CRLSP or MPLS traffic engineering tunnel needs to carry out FRR protection; the PLR noticing in corresponding CRLSP or MPLS traffic engineering tunnel sets up FRR Protection path; like this; can be in MPLS traffic engineering tunnel; only to carrying out CRLSP or the MPLS traffic engineering tunnel of traffic forwarding, set up FRR protection; can avoid for each CRLSP or each MPLS traffic engineering tunnel in MPLS TE protection group in same MPLS traffic engineering tunnel, setting up the wasting of resources that FRR brings simultaneously, can play effective backup again simultaneously.
Accompanying drawing explanation
Fig. 1 is active and standby CRLSP and the FRR networking schematic diagram of single MPLS traffic engineering tunnel;
Fig. 2 is MPLS traffic engineering tunnel protection group and FRR networking schematic diagram;
Fig. 3 is the process chart that in one embodiment of the present invention, head node coordinates with PLR node;
Fig. 4 is the hardware elementary diagram that serves as the network equipment of head node and PLR node in one embodiment of the present invention;
Fig. 5 is the structural representation of saving FRR reserved resource device in one embodiment of the present invention;
Fig. 6 is the structural representation of saving the servicing unit of FRR reserved resource in one embodiment of the present invention.
Embodiment
In MPLS traffic engineering tunnel technology, there is the single MPLS traffic engineering tunnel of a plurality of CRLSP or having in the network environment of MPLS traffic engineering tunnel protection group of a plurality of MPLS traffic engineering tunnels, can set up backup CRLSP link or create the mode of backup tunnel formation protecting tunnel group for MPLS traffic engineering tunnel single MPLS traffic engineering tunnel, carry out traffic protection, flow can or be forwarded in active and standby CRLSP link in active/standby tunnel, when main CRLSP link or main tunnel fails, can immediately data traffic be switched to backup CRLSP link or backup tunnel repeating, thereby assurance data traffic is not interrupted.In addition, for some key nodes, such as the active and standby CRLSP link node of process simultaneously, can adopt FRR technology to carry out separately protected.Carrying out FRR protects the problem facing to be; it is unit that its object of protection may be take MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; when traffic forwarding adopts 1:1 forward mode; now flow is only at the CRLSP in main CRLSP or main tunnel repeating; the CRLSP of backup CRLSP or backup tunnel is forwarding data flow not; therefore for the backup CRLSP or the backup tunnel that do not have data traffic to forward, carry out FRR protection and there is no need.Therefore; the present invention proposes a kind of method of saving FRR reserved resource in MPLS TE of saving; CRLSP or the MPLS traffic engineering tunnel that can only to needs, protect are carried out FRR protection, particularly, can only to current CRLSP or the MPLS traffic engineering tunnel that has data traffic to forward, carry out FRR protection.
The embodiment of the present invention can be applicable to have the MPLS traffic engineering tunnel of active and standby CRSLP and has in the foundation of FRR Protection path of MPLS traffic engineering tunnel group of active and standby MPLS traffic engineering tunnel, wherein, head node can be by sending the message with default mark, notify corresponding CRSLP or MPLS traffic engineering tunnel whether to need to set up FRR, angle from head node, the invention provides a kind of method of the FRR of saving reserved resource, angle from PLR node, the invention provides a kind of householder method of the FRR of saving reserved resource, head node and PLR node cooperatively interact, can realize the foundation of FRR Protection path.Referring to Fig. 3, head node and PLR node engagement process are carried out following steps:
Step S301: head node judges whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Step S302: described head node is judged when described current C RLSP or MPLS traffic engineering tunnel need FRR protection, in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the Point of Local Repair PLR noticing in described current C RLSP or MPLS traffic engineering tunnel, set up FRR;
The message that carries default mark that step S303:PLR node Receiver node sends, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Step S304: described PLR node is judged when current C RLSP or MPLS traffic engineering tunnel need FRR protection, set up FRR in current C RLSP or MPLS traffic engineering tunnel.
In the present embodiment; head node specifically can be by determining which the bar CRLSP in current MPLS traffic engineering tunnel carries out traffic forwarding; or which the bar tunnel in MPLS traffic engineering tunnel protection group carries out traffic forwarding; CRLSP or the MPLS traffic engineering tunnel of carrying out traffic forwarding are defined as carrying out CRLSP or the MPLS traffic engineering tunnel of FRR protection, and notify PLR corresponding on it to carry out the foundation of FRR Protection path.Like this, can avoid CRLSP or MPLS TE for there is no need to set up FRR protection link, reduce the waste of FRR reserved resource.
Particularly; when head node need to arrive current C RLSP or MPLS traffic engineering tunnel by flow switch; now; current C RLSP or MPLS traffic engineering tunnel need to be carried out flow and be passed transmission; can judge that current C RLSP or MPLS TE need FRR protection, for example, the main CRLSP fault in MPLS traffic engineering tunnel; need to be by flow switch to backup during CRLSP, backing up CRLSP needs FRR protection.And head node is need to be switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel by flow time; illustrate that current C RLSP or MPLS traffic engineering tunnel do not need to carry out traffic transport; can judge that current C RLSP or MPLS TE do not need FRR protection; for example; in MPLS traffic engineering tunnel, adopt 1+1 pattern to carry out traffic transport; in the time of need to being switched to 1:1 pattern, backup CRLSP or backup MPLS traffic engineering tunnel will can not carried out traffic transport, therefore not need FRR protection.
In practical application; when head node judges that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; can in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in current C RLSP or MPLS traffic engineering tunnel, remove the FRR having set up.Particularly; can, when head node need to be switched to present flow rate other CRLSP or MPLS traffic engineering tunnel, can judge that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection, therefore; can preset by transmission the message of mark, notice PLR removes the FRR Protection path of having set up.
A kind of preferred embodiment in; the present invention can be by increasing mark value in path (Path) message sending at head node; this mark value is default mark; in current active and standby part, there is the CRLSP of data traffic forwarding and do not have the CRLSP of data traffic forwarding to distinguish mark; with the PLR node of noticing in corresponding CRLSP or MPLS traffic engineering tunnel, whether at outgoing interface link establishment FRR, protect, like this can be to there being CRLSP or the MPLS traffic engineering tunnel that data traffic forwards to set up FRR protection.Wherein Path message is RSVP(Resource Reservation Protocol, RSVP) a kind of for setting up and safeguard the message of LSP link, after a common headers, immediately following one or more objects, form, its conventional object comprises labeling requirement (LABEL_REQUEST) object, route shows (EXPLICIT_ROUTE) object, route record (RECORD_ROUTE) object, session attribute (SESSION_ATTRIBUTE) object, sender's template (SENDER_TEMPLATE) object etc.
A kind of preferred embodiment in, in head node Path message, increase mark value specific implementation and can be: the flags to Path message SESSION_ATTRIBUTE object expands, and former Session Attribute object and flags field are as follows:
Wherein, in RFC3209, flags territory has been defined to three values:
0X01:Local protection desired(should be worth set when main LSP head node sends Path, represented to expect to carry out FRR protection)
0x02:Label recording desired(represents to expect to record label, when equipment Facility Node Protection, must record)
0x04:SE Style desired(represents to expect to share demonstration Share Explicit resource reservation)
In RFC4090, be further to support FRR, newly-increased two new Flags territory definition value
0x08:Bandwidth protection desired(represents expectation protection bandwidth)
0x10:Node protection desired(represents to expect Node Protection)
In this programme, then expand an attribute field, operating path field is only protected in expectation, whether need current C RLSP to carry out the field of FRR protection, this field is specially a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.In the present embodiment, described mark value one is 0, and described mark value two is 1.
It will be appreciated by those skilled in the art that; in actual use; except can carry default mark in Path message; to notice corresponding PLR, whether set up outside FRR Protection path; also can pass through independent message, this message can periodically send, or; only need to start to carry out before traffic transport at CRLSP or MPLS traffic engineering tunnel, or send while finishing to carry out traffic transport.Preferably, adopt Path message, Path message is in MPLS traffic engineering tunnel, to have carried out the protocol massages of link maintenance, and this message periodically sends, and can improve like this present invention program's practicality, does not need to change agreement etc.Simultaneously; when adopting Path message to send default mark; PLR can periodically receive this default mark; when PLR has set up FRR tunnel; receive again when FRR tunnel is set up in this default mark indication, can not need to re-establish, until receive while not needing FRR protection; just respond this message, remove FRR tunnel.
In embodiment described above, whether described judgement current C RLSP needs FRR protection, specifically refer in the environment shown in Fig. 1, be same flow and set up single MPLS traffic engineering tunnel, and MPLS traffic engineering tunnel at least comprises main CRLSP and backup two paths of CRLSP, whether the current MPLS traffic engineering tunnel of described judgement needs FRR protection, specifically refer in the environment shown in Fig. 2, be same flow and set up MPLS traffic engineering tunnel protection group, and MPLS traffic engineering tunnel protection group at least comprises main MPLS traffic engineering tunnel and backup MPLS traffic engineering tunnel, the message of presetting mark is carried in sending in MPLS traffic engineering tunnel wherein, specifically refer to and in the CRLSP of MPLS traffic engineering tunnel, send this message, when MPLS traffic engineering tunnel has a plurality of CRLSP, can in a plurality of CRLSP or one of them CRLSP, send this message simultaneously, specifically can determine as required, for example can whether need FRR to protect to determine whether to send this message in CRLSP according to the CRLSP in MPLS traffic engineering tunnel.
For ease of the understanding to technical solution of the present invention, below in conjunction with the MPLS traffic engineering tunnel network environment with active and standby CRLSP, a kind of flow to be set up in single MPLS traffic engineering tunnel network environment, FRR Protection path process of establishing is elaborated.
In the active and standby CRLSP of single MPLS traffic engineering tunnel and the network environment of FRR networking, after the active and standby CRLSP of MPLS traffic engineering tunnel sets up, head node regularly sends respectively Path message in active and standby part of CRLSP, Path message is for carrying out link maintenance to active and standby part of CRLSP, direction by head node along data-message transmission sends downstream, storing path state on all nodes on the way.
If what present flow rate forwarded employing is 1:1 traffic forwarding pattern; head node can transmit flow on primary CRLSP; now main CRLSP meets FRR protective condition; head node only protects the mark value of operating path field to be all made as 0 the expectation of carrying in the Path message of main CRLSP; PLR node is received after the path message that carries default mark that head node sends; judge that current main CRLSP needs FRR protection, so set up FRR Protection path at this node.The object of this this Node Protection, for example, be that the link between downstream node or this node and downstream node is set when MPLS traffic engineering tunnel is set up, or preassigned.Wherein, FRR Protection path is set up in this locality; can be interim foundation; also can be that the FRR Protection path having established and this node are bound at current C RLSP; for the MPLS traffic engineering tunnel only with active and standby CRLSP; and be the scene that is operated in 1:1 forward mode; preferential employing can be set up a FRR Protection path satisfying condition at PLR node; when CRLSP need to set up FRR protection; the FRR that this can have been set up is tied to CRLSP; when CRLSP does not need FRR protection, if built vertical binding, can unbind.
If main CRLSP fault now; head node need to forward flow switch to backup CRLSP; now main CRLSP no longer needs FRR protection; backup CRLSP needs FRR protection, so head node only protects the mark value of operating path field to be all made as 0 expectation in the Path message of backup CRLSP.PLR node is received after the path message that carries default mark that head node sends, and judges that current backup CRLSP needs FRR protection, so set up FRR Protection path backing up on CRLSP.
For the main CRLSP breaking down; in MPLS traffic engineering tunnel technology; main CRLSP can be automatically deleted; the FRR Protection path of having set up also can be deleted automatically; here can be specifically the binding of removing FRR Protection path and current C RLSP; so that backup CRSLP can utilize the FRR Protection path and backup CRLSP binding of this releasing, for backup CRLSP.After main CRLSP fault recovery re-establishing; now flow is switched to main CRLSP tunnel again; the object of the current FRR of needs protection changes; so head node only protects the mark value of operating path field to adjust to the expectation in the Path message sending; head node only protects the mark value of operating path field to be made as 0 the expectation of carrying in the Path message of main CRLSP, only protects the mark value of operating path field to be all made as 1 the expectation of carrying in the Path message of backup CRLSP.PLR receives after the path message that carries default mark that head node sends; judge that current main CRLSP needs FRR protection; current backup CRLSP does not need FRR protection, then remove the existing FRR binding of backup CRLSP, and FRR Protection path and main CRLSP are bound.
In addition; if what present flow rate forwarded employing is 1+1 traffic forwarding pattern; head node can transmit flow simultaneously on the backup CRLSP that advocates peace; the backup CRLSP that now advocates peace all meets FRR protective condition; head node only protects the mark value of operating path field to be all made as 0 the expectation of carrying in the Path message of primary and backup CRLSP; PLR node is received after the path message that carries default mark that head node sends; judge that the current backup CRLSP that advocates peace needs FRR protection, so set up FRR Protection path on the backup CRLSP that advocates peace simultaneously.
If main CRLSP fault now, a node need to be upper to backup CRLSP by the flow switch on main CRLSP, and main CRLSP can be deleted, and the FRR protection binding of having set up automatically terminates.
After main CRLSP fault recovery re-establishing; now head node arrives main CRLSP by flow switch again; now active and standby CRLSP all meets FRR protective condition; it is all 0 that the mark value of operating path field is only protected in the expectation of carrying in the Path message of active and standby CRLSP; PLR receives after the path message that carries default mark that head node sends; judge that the current backup CRLSP that advocates peace needs FRR protection, binds FRR Protection path respectively with the backup CRLSP that advocates peace.
Above FRR process of establishing in single MPSL traffic engineering tunnel is illustrated; in MPLS traffic engineering tunnel protection group, set up FRR and can there is similar process; can be by judging whether the MPLS traffic engineering tunnel in protection group needs FRR to protect; in MPLS traffic engineering tunnel, set up FRR, its specific implementation process does not repeat them here.
Refer to Fig. 5, in a preferred embodiment, the present invention also provides device corresponding to the method for a kind of and above-mentioned a kind of FRR of saving reserved resource 50, be applied on the head node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group, described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route, described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel, described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP.This device 50 specifically can comprise:
The specific implementation process of the device 50 that the embodiment of the present invention provides can, referring to the explanation of said method embodiment, not repeat them here.
In above-mentioned device 50, described default mark specifically can be a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.And described default mark is specifically carried in Path message.
In above-mentioned device 50, described protection identifying unit 51, while specifically can be used for flow switch to be arrived to current C RLSP or MPLS traffic engineering tunnel, judges that current C RLSP or MPLS TE need FRR protection; And while flow being switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel for needs, judge that current C RLSP or MPLS TE do not need FRR protection.
In device 50 provided by the invention; also can comprise and remove notification unit 53; for when described protection identifying unit 51 judges that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in described current C RLSP or MPLS traffic engineering tunnel, remove the FRR having set up.
Referring to Fig. 4; device corresponding to the method with the above-mentioned a kind of FRR of saving reserved resource that the present embodiment provides, specifically also can realize by the hardware shown in Fig. 4, particularly; controller in Fig. 4 (CPU) is connected with memory and other hardware; wherein, deposited program or instruction in memory, CPU can be by program or instruction in read memory; carry out corresponding operation; other hardware, can be specifically communication interface, can receive or send message etc.
Particularly, CPU, by program or instruction in read memory, can carry out following operation:
CPU is by fetch program or instruction; judge whether current C RLSP or MPLS traffic engineering tunnel need FRR protection; and judge when described current C RLSP or MPLS traffic engineering tunnel need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, by communication interface, send the message that carries default mark, with the Point of Local Repair PLR noticing in described current C RLSP or MPLS traffic engineering tunnel, set up FRR.
Wherein, described default mark specifically can be a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.And default mark is specifically carried in path P ath message.
Above-mentioned CPU fetch program or instruction, specifically can, when head node need to arrive current C RLSP or MPLS traffic engineering tunnel by flow switch, judge that current C RLSP or MPLS TE need FRR protection; And when head node need to be switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel by flow, judge that current C RLSP or MPLS TE do not need FRR protection.
Above-mentioned CPU fetch program or instruction; also can be when judging that described current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in described CRLSP or MPLS traffic engineering tunnel, remove the FRR having set up.
Referring to Fig. 6, in a preferred embodiment, the present invention also provides the device 60 corresponding with the householder method of the above-mentioned a kind of FRR of saving reserved resource, be applied on the PLR node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group, described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route, described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel, described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP.This device 60 specifically can comprise:
Mark identifying unit 61, the message that carries default mark sending for Receiver node, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
The specific implementation process of the device 60 that the embodiment of the present invention provides can, referring to the explanation of said method embodiment, not repeat them here.
In said apparatus 60, unit 62 is set up in protection, specifically can be used for the FRR for the protection of same MPLS traffic engineering tunnel or same MPLS traffic engineering tunnel group having set up on described PLR node and current C RLSP or the binding of MPLS traffic engineering tunnel.
Referring to Fig. 4; device corresponding to the householder method with the above-mentioned a kind of FRR of saving reserved resource that the present embodiment provides, also can realize by the hardware shown in Fig. 4, particularly; controller in Fig. 4 (CPU) is connected with memory and other hardware; wherein, deposited program or instruction in memory, CPU can be by program or instruction in read memory; carry out corresponding operation; other hardware, can be specifically communication interface, can receive or send message etc.
Particularly, CPU, by program or instruction in read memory, can carry out following operation:
CPU fetch program or instruction, the message that carries default mark that can send from communication interface Receiver node, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection; And when judging that current C RLSP or MPLS traffic engineering tunnel need FRR protection, in current C RLSP or MPLS traffic engineering tunnel, set up FRR.
Wherein, CPU fetch program or instruction, specifically can be by the FRR for the protection of same MPLS traffic engineering tunnel or same MPLS traffic engineering tunnel group having set up on described PLR node and current C RLSP or the binding of MPLS traffic engineering tunnel.
Through the above description of the embodiments, it will be appreciated by those skilled in the art that the unit in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.A unit can be merged in the unit of above-described embodiment, also can further split into a plurality of submodules.
Foregoing invention embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (14)
1. a method of saving quick heavy-route FRR reserved resource; be applied on the head node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP; it is characterized in that, described method comprises:
Head node judges whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Described head node is judged when described current C RLSP or MPLS traffic engineering tunnel need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the Point of Local Repair PLR noticing in described current C RLSP or MPLS traffic engineering tunnel, set up FRR.
2. the method for claim 1, is characterized in that, described default mark is specially a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.
3. method according to claim 1 and 2, is characterized in that, described default mark is carried in path P ath message.
4. the method for claim 1, is characterized in that, described head node judges that whether current C RLSP or MPLS traffic engineering tunnel need FRR protection, are specially:
When described head node need to arrive current C RLSP or MPLS traffic engineering tunnel by flow switch, judge that current C RLSP or MPLS TE need FRR protection;
When described head node need to be switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel by flow, judge that current C RLSP or MPLS TE do not need FRR protection.
5. the method as described in claim 1 or 4, is characterized in that, also comprises:
Described head node is judged when described current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in described CRLSP or MPLS traffic engineering tunnel, remove the FRR having set up.
6. a householder method of saving FRR reserved resource; be applied on the PLR node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP; it is characterized in that, described method comprises:
The message that carries default mark that PLR node Receiver node sends, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Described PLR node is judged when current C RLSP or MPLS traffic engineering tunnel need FRR protection, in current C RLSP or MPLS traffic engineering tunnel, is set up FRR.
7. method as claimed in claim 6; it is characterized in that, describedly in current C RLSP or MPLS traffic engineering tunnel, set up FRR and be specially: by the FRR for the protection of same MPLS traffic engineering tunnel or same MPLS traffic engineering tunnel group having set up on described PLR node and current C RLSP or the binding of MPLS traffic engineering tunnel.
8. a device of saving FRR reserved resource; be applied on the head node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP; it is characterized in that, described device comprises:
Protection identifying unit, for judging whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Packet labeling unit; be used for when described protection identifying unit judges that current C RLSP or MPLS traffic engineering tunnel need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the Point of Local Repair PLR noticing in described current C RLSP or MPLS traffic engineering tunnel, set up FRR.
9. device as claimed in claim 8, is characterized in that, described default mark is specially a mark value, when described mark value is mark value a period of time, represents that current C RLSP or MPLS traffic engineering tunnel need FRR protection; When described mark value is mark value two, represent that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection.
10. device according to claim 8 or claim 9, is characterized in that, described default mark is carried in Path message.
11. devices as claimed in claim 8, is characterized in that, described protection identifying unit, while flow switch being arrived to current C RLSP or MPLS traffic engineering tunnel specifically for needs, judges that current C RLSP or MPLS TE need FRR protection; And while flow being switched to other CRLSP or MPLS traffic engineering tunnel from current C RLSP or MPLS traffic engineering tunnel for needs, judge that current C RLSP or MPLS TE do not need FRR protection.
12. devices as described in claim 8 or 11, is characterized in that, also comprise:
Remove notification unit; when described protection identifying unit judges that current C RLSP or MPLS traffic engineering tunnel do not need FRR protection; in current C RLSP or MPLS traffic engineering tunnel, send the message that carries default mark, with the PLR node of noticing in described CRLSP or MPLS traffic engineering tunnel, remove the FRR having set up.
13. 1 kinds of servicing units of saving FRR reserved resource; be applied on the PLR node of multi-protocol label switching traffic engineering MPLS traffic engineering tunnel or MPLS traffic engineering tunnel protection group; described MPLS traffic engineering tunnel at least comprises label switched path CRLSP and the backup CRLSP of a master based on constraint route; described MPLS traffic engineering tunnel protection group at least comprises a main MPLS traffic engineering tunnel and a backup MPLS traffic engineering tunnel; described main MPLS and backup MPLS traffic engineering tunnel at least respectively comprise a CRLSP; it is characterized in that, described device comprises:
Mark identifying unit, the message that carries default mark sending for Receiver node, and judge according to described default mark whether current C RLSP or MPLS traffic engineering tunnel need FRR protection;
Unit is set up in protection, when judging that when mark identifying unit current C RLSP or MPLS traffic engineering tunnel need FRR to protect, in current C RLSP or MPLS traffic engineering tunnel, sets up FRR.
14. devices as claimed in claim 13; it is characterized in that; unit is set up in described protection, specifically for by the FRR for the protection of same MPLS traffic engineering tunnel or same MPLS traffic engineering tunnel group having set up on described PLR node and current C RLSP or the binding of MPLS traffic engineering tunnel.
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