CN101083611B - Apparatus for using color identification L-LSP tunnel packet forwarding priority - Google Patents
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Abstract
The invention relates to a device used color to mark LSP tunnel message transmission priority. It includes flow classifier and destination address inquiry component used to classify Ethernet data into QoS service flow, flow monitoring component used to monitor each service flow message and mark given color mark on the message according to the QoS parameter, massage buffer store component used to store the message, queue management component used to manage store space, massage scheduler used to output port service dispatch. The invention not only can simplify logical design and hardware realization difficulty, but also can ensure different classified service flow QoS.
Description
Technical field
The present invention relates to a kind of device that uses color identification L-LSP tunnel packet forwarding priority.
Background technology
Can exchange the tunnel that the MPLS data transport network is set up two types of E-LSP and L-LSP at multi protocol label.For the tunnel of E-LSP type, node uses EXP to distinguish the scheduling classification of message and the loss priority of sign message; For the tunnel of E-LSP type, node uses tunnel label value label to distinguish the dispatching message classification, uses the loss priority of EXP sign message.
When using L-LSP to transmit Ethernet service, at the edge of MPLS network inlet provider edge equipment PE node, can traffic differentiation be transmitted the Business Stream of AF, three the service quality QoS classifications of BE of doing one's best for the quick EF of forwarding, guarantee according to specific rule, and directly use the service quality QoS classification of the mark value label differentiated service stream in L-LSP tunnel.The EXP that is used to identify packet loss priority comprises 3 bits, co-exists in 8 ranks.Middle P node and edge outlet PE node suffer from when congested, can preferentially abandon the message of high discard level according to the EXP coding of current message.
In order to ensure the service quality of Business Stream, node is the message of priority scheduling high quality-of-service QoS classification Business Stream always, and therefore, the message of three kinds of service quality QoS classifications must have separately that independently loss priority is other.The message of every kind of service quality QoS classification is divided into 8 other loss prioritys of level, has increased the design difficulty of hardware logic, be not easy to the integrated of system and set up the raising of traffic handing capacity fully.In addition, the intrinsic transmission characteristic of Ethernet service itself does not need the loss priority of message is not sub-divided into so high degree yet.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of device that uses color identification L-LSP tunnel packet forwarding priority.
In order to solve the problems of the technologies described above, design of the present invention is to simplify processing, at edge entry PE intra-node, use the preferential forwarding rank of colour code different QoS classification message, the scheduler of PE node and P node is selected the preferential message of transmitting of needs according to the QoS classification and the colour code of message all the time on the same tunnel.Like this, both simplify logical design and hardware and realized difficulty, and can continue to ensure the QoS of different classes of Business Stream again.
In order to realize above-mentioned design, when the present invention uses the MSTP of embedded MPLS function to make up Ethernet data transmission network, lsp tunnel entry PE node is divided into a plurality of Business Streams of EF, AF, three OoS classifications of BE according to traffic contract SLA parameter with the Ethernet data of input, and traffic monitor Policing parts are stamped specific color mark for each message that passes through.The scheduler of entry PE node, middle P node, outlet PE node is always selected to transmit according to the QoS classification and the colour code of message correspondence on the way, guarantees that Business Stream obtains satisfied service quality.
The grade of service CoS classifying rules that the present invention quotes is as follows:
The information that is used for grade of service CoS setting has: physical port, virtual LAN VLAN ID and User Priority PRI.The policy information that can use the one or more combined informations in these information to be provided with as grade of service CoS to VC.Physical port, the data that enter from each ethernet port all are divided into the grade of service Cos stream.Virtual LAN VLAN ID, only according to the value in virtual LAN VLAN ID territory, do not consider that user PRI bits of encoded value classifies to PW, PW is set to specific grade of service Cos.802.1p, value according to virtual LAN VLAN ID territory is classified to PW, and the PRI bit is mapped to the different grade of service CoS mark of PW layer; Make the frame of same virtual LAN VLAN ID value have identical type of service, but the frame of different PRI bits of encoded has different discard processing priority when network transmits, or according to virtual LAN VLAN ID value and PRI bits of encoded PW is classified, the frame with different PRI bits of encoded values is mapped to different pseudo-line PW.
The Qos mapping ruler is, MPLS Qos information is defined by label value field in the MPLS label and EXP field, can support among the MPLS consistent among the definition of Cos and the IEEE802.1Q the definition of CoS, also can formulate the mapping relations of the Priority flag of IEEE802.1Q, handle with reference to IETF RFC3270 according to operator's practical application request to the MPLS Priority flag.Three kinds of service quality QoSs of MPLS have been defined according to IETFRFC3270: transmit (EF) fast, ensure and transmit (AF) and transmit (BE) as possible.
In the MPLS generic configuration management function, network system should be able to be carried out following management function to the MSTP equipment of embedded MPLS:
1) assignment of support MPLS FEC dividing mode: port, virtual LAN VLAN ID, port+virtual LAN VLAN.
2) assignment of support MPLS service quality:
The assignment of-support LSP QoS rule: (CAR, Cos, RED etc.):
The assignment of-support LSP qos parameter: (CIR, PIR, CBS, PBS etc.):
The binding relationship assignment of-support LSP QoS and stream.
3) support the MPLS frame to be fitted to the assignment of the encapsulated type of service layer's passage: GFP, PPP, HDLC, LAPS.
4) hold the assignment of a MPLS logical port number in the physical port relation.
5) information inquiry of support LSP, comprising: the FEC type, inbound port is gone into label, outbound port, outgoing label, LSP type (Ingress, Engress, Transit).
6) total bandwidth of support MPLS logic port and the demonstration that can distribute bandwidth.
The technical scheme that provides of the present invention comprises at the ingress edge PE of lsp tunnel intra-node:
Flow classifier and destination address inquiry parts, be used for after ingress edge PE node receives Ethernet data, Ethernet data is categorized into the Business Stream of different QoS classification, directly or determine the output port of Business Stream by the destination address inquiry, select suitable pseudo-wire tag, and pseudo-wire tag is tied to LSP;
The traffic monitor parts are used to monitor the message of each Business Stream, are that the message of process is stamped specific color mark according to qos parameter;
The message buffering memory unit is used for temporary message;
The queue management parts, be used for the space storage administration of described message buffering memory unit, when message passes through described traffic monitor parts, and when there are enough free spaces in described message buffering memory unit, described queue management parts are temporary to the message buffering memory unit with message, otherwise, abandon current message;
The dispatching message parts are used for the service dispatching of output port, E-Packet in regular turn according to the color mark of message.
Described device further comprises at the middle on the way P intra-node of lsp tunnel:
Flow classifier and destination address inquiry parts are used for the Business Stream according to MPLS mark value differentiation different QoS classification, and the output port of definite LSP;
The message buffering memory unit is used for temporary message;
The queue management parts, be used for the space storage administration of described message buffering memory unit, when message passes through described traffic monitor parts, and when there are enough free spaces in described message buffering memory unit, described queue management parts are temporary to the message buffering memory unit with message, otherwise, abandon current message;
The dispatching message parts are used for the service dispatching of output port, E-Packet in regular turn according to the color mark of message.
Described device further comprises at the middle on the way P intra-node of lsp tunnel:
The traffic monitor parts are used to monitor the message of each Business Stream, and nonrecognition does not change the colour code of message yet during supervision.
Described device further comprises at lsp tunnel outlet edge PE intra-node:
Flow classifier and destination address inquiry parts are used for according to the MPLS frame flag value differentiated service stream that receives, according to pseudo line tag directly or determine the output port of Ethernet data by the destination address inquiry;
The message buffering memory unit is used for temporary message;
The queue management parts, be used for the space storage administration of described message buffering memory unit, when message passes through described traffic monitor parts, and when there are enough free spaces in described message buffering memory unit, described queue management parts are temporary to the message buffering memory unit with message, otherwise, abandon current message;
The dispatching message parts are used for the service dispatching of output port, E-Packet in regular turn according to the color mark of message.
Described device further comprises at lsp tunnel outlet edge PE intra-node:
The traffic monitor parts are used to monitor the message of each Business Stream, and nonrecognition does not change the colour code of message yet during supervision.
Described device, described flow classifier and destination address inquiry parts are divided into Ethernet data quick forwarding EF, ensure the Business Stream of transmitting AF, three the QoS classifications of BE of doing one's best.
Described traffic monitor parts monitor the message that each Business Stream reaches according to qos parameter, and for EF class various-service, the message of being less than or equal to peak rate PIR is stamped Green Marker, and the message that exceeds PIR directly abandons; For the business of AF classification, to be less than or equal to the message that ensures speed CIR and to stamp Green Marker, the message that is higher than CIR and is not higher than PIR is stamped yellow mark, directly abandons the message that exceeds PIR; For the business of BE classification, the message of being less than or equal to PIR is stamped Green Marker, and the message that exceeds PIR directly abandons.
Described dispatching message parts do not have when congested, ensure PIR, the CIR of AF class various-service, the PIR of BE class various-service of EF class various-service; Exist when congested, the bandwidth of low QoS classification Business Stream is removed high QoS classification and is seized.
Described queue management parts reclaim the space of corresponding message buffering memory unit after when the dispatching message parts message successfully being transmitted.
P node and the Business Stream use identical traffic contract SLA parameter of described edge PE node in the middle of described to same lsp tunnel.
Like this, the present invention had both simplified logical design and hardware is realized difficulty, can continue to ensure the QoS of different classes of Business Stream again.
Description of drawings
Fig. 1 is the structure of described device at ingress edge PE intra-node.
Fig. 2 is the structure of described device at middle P intra-node.
Fig. 3 is the structure of described device at outlet edge PE intra-node.
Fig. 4 is described device is handled EXP at lsp tunnel ingress edge PE intra-node a method.
Fig. 5 is the method that described device P intra-node in the middle of lsp tunnel is handled EXP.
Fig. 6 is described device is handled EXP at lsp tunnel outlet edge PE intra-node a method.
Embodiment
Entry PE intra-node at a lsp tunnel comprises flow classifier and destination address inquiry CLA﹠amp; Lookup, traffic monitor Policing, queue management Que, parts such as message buffering module Buffer, dispatching message Sch; Middle P intra-node comprises CLA ﹠amp; Lookup, optional Policing, Que, parts such as Buffer, Sch; The outlet PE intra-node comprises CLA ﹠amp; Lookup, optional Policing, Que, parts such as Buffer, Sch.Edge PE node and the Business Stream use identical traffic contract SLA parameter of middle P node to same lsp tunnel.
After lsp tunnel ingress edge PE node receives Ethernet data, the CLA ﹠amp of described device; Lookup is categorized into the Business Stream of different QoS classification with ethernet frame, directly or optional determines the output port of Business Stream by the destination address inquiry, selects suitable PW mark, and PW is tied to LSP.Policing monitors the message that each Business Stream reaches according to qos parameter, and for EF class various-service, the message of being less than or equal to peak rate PIR is stamped Green Marker, and the message that exceeds PIR directly abandons; For the business of AF classification, to be less than or equal to the message that ensures speed CIR and to stamp Green Marker, the message that is higher than CIR and is not higher than PIR is stamped yellow mark, directly abandons the message that exceeds PIR; For the business of BE classification, the message of being less than or equal to PIR is stamped Green Marker, and the message that exceeds PIR directly abandons.Que is responsible for the storage management in Buffer space, and when the supervision of message by Policing handled, and Buffer is when existing enough free spaces, and Que is temporary to Buffer with message, otherwise Que abandons current message.In a single day message deposits Buffer in, and Que does not initiatively abandon this message or reclaims this message occupation space, has only after Sch successfully transmits message, and Que could reclaim corresponding Buffer space.Sch is responsible for the scheduling of output port business, preferentially transmits the green packet of EF classification, secondly is the green packet of AF classification, is the yellow packet of AF classification then, transmits the green packet of BE classification at last.Do not have when congested, Sch ensures PIR, the CIR of AF class various-service, the PIR of BE class various-service of EF class various-service; Exist when congested, the bandwidth of low QoS classification Business Stream is removed high QoS classification and is seized.
The business of AF classification is mainly used in supports to exist the data of burst (Burst) demand to transmit, the message that allows to be in a short time between CIR and the PIR passes through, rely on 4 parameters such as PIR, CIR, peak rate bursts size PBS, guarantee speed burst size CBS to eliminate the shake of input rates, but corresponding output stream rate limit is for being not less than CIR.Be not difficult to find out, congested even without output port occurring, because the Burst characteristic of inlet flow also may comprise green and yellow two kinds of messages simultaneously in the output stream of AF class various-service.
After the P node receives the MPLS frame in the middle of the lsp tunnel, the CLA ﹠amp of described device; Lookup directly distinguishes the Business Stream of different QoS classification according to the MPLS mark value, and the output port of definite LSP.The described device of middle P intra-node Policing optional, if use, with can not change, the also colour code of nonrecognition message, other functions are with the Policing of the described device of lsp tunnel entry PE intra-node.Functional equivalents such as Que, Buffer, Sch are in the same parts of the described device of lsp tunnel entry PE intra-node.
The CLA ﹠amp of the described device of lsp tunnel outlet edge PE intra-node; Lookup is according to the MPLS frame flag value differentiated service stream that receives, according to the direct or optional output port of determining Ethernet data by the destination address inquiry of PW label.The Policing of the described device of lsp tunnel outlet edge PE intra-node is optional.The same parts of functional equivalents such as Policing, Que, Buffer, Sch described device of P intra-node in the middle of lsp tunnel.
Fig. 1 has described the structure of described device at ingress edge PE intra-node.The ethernet frame that arrives 100 reference points through user interface UNI is by 101 (CLA ﹠amp; Lookup) the Business Stream .101 that is divided into the different QoS classification according to specific classifying rules is that Business Stream is selected suitable PW label, PW is tied to LSP, and the output port .LSP tunnel label value of the definite Business Stream .Policing that is associated with specific class of service and qos parameter monitors the message that arrives based on Business Stream, and the colour code the during output of definite message. for the Business Stream of EF classification, the message identification of being less than or equal to PIR is green EF message, EXP=000, the message that exceeds PIR directly abandons. to the Business Stream of AF classification, the message identification of being less than or equal to CIR is green AF message, EXP=001; The message identification that is higher than CIR and is not higher than PIR is yellow AF message, EXP=010; The message that exceeds PIR directly abandons. and for the Business Stream of BE classification, the message identification of being less than or equal to PIR is the BE green packet, EXP=011; The message that exceeds PIR directly abandons the Buffer space of .Que management buffering message, when having enough free spaces, buffering comes from the message of Policing, otherwise, random drop comes from the message .Sch of Policing all the time according to Business Stream QoS classification and message colour code scheduling port message, and use qos parameter to limit the output bandwidth of each Business Stream. whether congestedly no matter occur, Sch at first dispatches the EF green packet, secondly be the AF green packet, be the AF yellow packet once more, be connected to the NNI interface of ingress edge PE node at last for BE green packet .103.
Fig. 2 has described the structure of described device at middle P intra-node.The MPLS frame that arrives 200 reference points through network interface NNI is by 201 (CLA ﹠amp; Lookup) be mapped to the Business Stream of specific qos class according to the MPLS label value, and the MPLS label and the output port of definite outgoing message.The message of Business Stream arrives Que after directly monitoring by 202 bypasses or through Policing.Policing does not change the message color that the lsp tunnel upstream node is provided with, about the Business Stream message pass criteria of each QoS classification identical with the Policing of the described device of lsp tunnel entry PE intra-node.Que, Buffer, Sch functional equivalent are in the described device same parts of lsp tunnel entry PE intra-node.203 are connected to the NNI interface of middle P node.
Fig. 3 has described the structure of described device at outlet edge PE intra-node.The MPLS frame that arrives 300 reference points through the NNI interface is by 301 (CLA ﹠amp; Lookup) be mapped to the Business Stream of specific qos class according to the MPLS label value, and according to the direct or optional output port of determining Ethernet data by the destination address inquiry of PW.The message of Business Stream arrives Que after directly monitoring by 302 bypasses or through Policing.Policing, Que, Buffer, the Sch functional equivalent described device same parts of P intra-node in the middle of lsp tunnel.303 are connected to the uni interface of outlet edge PE node.
Fig. 4 has described described device is handled EXP at lsp tunnel entry PE intra-node method.Peel off checking data Eth FCS from the ethernet frame 400 of uni interface input, be identified as different colours 403 after the supervision of payload part EthPayload by Policing.The message 401 that outputs to the NNI interface has added PW and the two-layer label of LSP, and wherein, the EXP of PW label 404 is set to 000 for keeping the position, and the EXP of LSP label 402 is mapped as the colour code of corresponding message.
Fig. 5 has described the method that described device P intra-node in the middle of lsp tunnel is handled EXP.From the MPLS frame 500 of NNI interface input, the EXP of its LSP label 501 has identified the color of message, through described device, output to the MPLS frame 502 of NNI interface, the EXP of its LSP label 503 does not change, that is, the described device of P intra-node does not change the colour code of message in the middle of lsp tunnel.
Fig. 6 has described described device is handled EXP at lsp tunnel outlet PE intra-node method.From the MPLS frame 600 of NNI interface input, the EXP of its LSP label 601 has colour code.The EXP of nonrecognition PW label 602.The message 603 that sends to uni interface is the ethernet frame of standard.
There is the management strategy of multiple Buffer in the node device of MPLS network.The Que of described device has only after the message quilt is successfully transmitted could be reclaimed corresponding memory space; if distribute Buffer according to Business Stream overall situation sharing mode; the low qos class business that exists cushion space to be detained is shared, and the hidden danger of high qos class business can not normally cushioning.For this reason, the Buffer way to manage by every Business Stream independent allocation cushion space is used in described device suggestion; Or use, and reserve the Buffer way to manage that some cushion spaces are shared by all Business Streams by every Business Stream independent allocation cushion space.
Claims (10)
1. a device that uses colour code lsp tunnel packet forwarding priority is characterized in that, comprises at the ingress edge PE of lsp tunnel intra-node:
Flow classifier and destination address inquiry parts, be used for after ingress edge PE node receives Ethernet data, Ethernet data is categorized into the Business Stream of different QoS classification, directly or determine the output port of Business Stream by the destination address inquiry, select suitable pseudo-wire tag, and pseudo-wire tag is tied to LSP;
The traffic monitor parts are used to monitor the message of each Business Stream, are that the message of process is stamped specific color mark according to qos parameter;
The message buffering memory unit is used for temporary message;
The queue management parts, be used for the space storage administration of described message buffering memory unit, when message passes through described traffic monitor parts, and when there are enough free spaces in described message buffering memory unit, described queue management parts are temporary to the message buffering memory unit with message, otherwise, abandon current message;
The dispatching message parts are used for the service dispatching of output port, E-Packet in regular turn according to the color mark of message.
2. device as claimed in claim 1 is characterized in that, further comprises at the middle on the way P intra-node of lsp tunnel:
Flow classifier and destination address inquiry parts are used for the Business Stream according to MPLS mark value differentiation different QoS classification, and the output port of definite LSP;
The message buffering memory unit is used for temporary message;
The queue management parts, be used for the space storage administration of described message buffering memory unit, when message passes through described traffic monitor parts, and when there are enough free spaces in described message buffering memory unit, described queue management parts are temporary to the message buffering memory unit with message, otherwise, abandon current message;
The dispatching message parts are used for the service dispatching of output port, E-Packet in regular turn according to the color mark of message.
3. device as claimed in claim 2 is characterized in that, described lsp tunnel on the way in the middle of the P intra-node further comprise:
The traffic monitor parts are used to monitor the message of each Business Stream, and nonrecognition does not change the colour code of message yet during supervision.
4. device as claimed in claim 1 is characterized in that, further comprises at lsp tunnel outlet edge PE intra-node:
Flow classifier and destination address inquiry parts are used for according to the MPLS frame flag value differentiated service stream that receives, according to pseudo line tag directly or determine the output port of Ethernet data by the destination address inquiry;
The message buffering memory unit is used for temporary message;
The queue management parts, be used for the space storage administration of described message buffering memory unit, when message passes through described traffic monitor parts, and when there are enough free spaces in described message buffering memory unit, described queue management parts are temporary to the message buffering memory unit with message, otherwise, abandon current message;
The dispatching message parts are used for the service dispatching of output port, E-Packet in regular turn according to the color mark of message.
5. device as claimed in claim 4 is characterized in that, describedly further comprises at lsp tunnel outlet edge PE intra-node:
The traffic monitor parts are used to monitor the message of each Business Stream, and nonrecognition does not change the colour code of message yet during supervision.
6. device as claimed in claim 1 is characterized in that, described flow classifier and destination address inquiry parts are divided into Ethernet data quick forwarding EF, ensure the Business Stream of transmitting AF, three the QoS classifications of BE of doing one's best.
7. device as claimed in claim 6 is characterized in that, described traffic monitor parts, monitor the message that each Business Stream reaches according to qos parameter, for EF class various-service, the message of being less than or equal to peak rate PIR is stamped Green Marker, and the message that exceeds PIR directly abandons; For the business of AF classification, to be less than or equal to the message that ensures speed CIR and to stamp Green Marker, the message that is higher than CIR and is not higher than PIR is stamped yellow mark, directly abandons the message that exceeds PIR; For the business of BE classification, the message of being less than or equal to PIR is stamped Green Marker, and the message that exceeds PIR directly abandons.
8. device as claimed in claim 7 is characterized in that, described dispatching message parts do not have when congested, ensure PIR, the CIR of AF class various-service, the PIR of BE class various-service of EF class various-service; Exist when congested, the bandwidth of low QoS classification Business Stream is seized by high QoS classification.
9. device as claimed in claim 1 is characterized in that, described queue management parts reclaim the space of corresponding message buffering memory unit after when the dispatching message parts message successfully being transmitted.
10. device as claimed in claim 2 is characterized in that, described middle P node and described edge PE node use identical traffic contract SLA parameter to the Business Stream of same lsp tunnel.
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| CN101217470B (en) * | 2007-12-29 | 2012-11-21 | 华为技术有限公司 | Method and device for forwarding message |
| CN101820385A (en) * | 2010-02-10 | 2010-09-01 | 中国电子科技集团公司第三十研究所 | Method for controlling flow of IP data stream |
| CN102281596B (en) * | 2010-06-11 | 2015-10-07 | 重庆重邮信科通信技术有限公司 | The method of voice and packet data concurrent service qos parameter, device and mobile terminal are set |
| CN102148815B (en) * | 2010-10-26 | 2014-08-13 | 华为技术有限公司 | Video stream dispatching method and network node |
| CN102055676B (en) * | 2011-01-25 | 2013-11-27 | 杭州华三通信技术有限公司 | Method and device for realizing load sharing in multiple spanning tree protocol (MSTP) networking environment |
| CN103841022B (en) * | 2014-03-12 | 2017-04-05 | 华为技术有限公司 | For setting up the method and device in tunnel |
| CN108595270B (en) * | 2018-04-27 | 2021-07-23 | 新华三信息安全技术有限公司 | Memory resource recovery method and device |
| CN110830373B (en) * | 2018-08-14 | 2022-02-11 | 上海层峰网络科技有限公司 | Method and device for realizing QOS service quality differentiation of service in SDN network |
| CN114205297B (en) * | 2020-08-28 | 2024-05-17 | 华为技术有限公司 | Traffic forwarding processing method and equipment |
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