CN101611393B

CN101611393B - Performance monitoring of pseudowire emulation

Info

Publication number: CN101611393B
Application number: CN2007800513373A
Authority: CN
Inventors: 罗曼·克扎诺夫斯基
Original assignee: Verizon Services Corp
Current assignee: Verizon Services Corp
Priority date: 2006-12-21
Filing date: 2007-12-21
Publication date: 2012-10-10
Anticipated expiration: 2027-12-21
Also published as: CN101611595A; CN101611596A; CN101611596B; CN101611595B; CN101611393A

Abstract

A system may forward to a network device an advertisement label mapping message that requests an establishment of an active performance monitoring (APM) control channel. Further, the system may process a reply label mapping message that is sent from the network device in response. The system may establish the APM control channel and a pseudowire associated with the APM control channel.

Description

The performance monitoring of pseudo wire emulation

Technical field

The present invention relates to the pseudo wire emulation field.

Background technology

Leave over network (legacy network) system; Such as network system based on frame relay or ATM(Asynchronous Transfer Mode); Can communicate said packet switching network such as Internet Protocol (IP) exchange network or multiprotocol label switching (mpls) network through pseudo wire emulation (PWE) and packet switching network (PSN).Have necessary management and control PWE and related pseudo-line.

Summary of the invention

According to an aspect, the invention provides a kind of method, comprising: transmit the announcement label mapping message to the network equipment, the request of said announcement label mapping message is set up Active Performance and is kept watch on control channel; The answer label mapping message that processing response is sent in said announcement label mapping message and from the said network equipment; The Active Performance of setting up pseudo-line and being associated with said pseudo-line is kept watch on control channel; The channel type field is inserted into Active Performance keeps watch in the control word of message, to have indicated the said Active Performance information relevant of having kept watch on message bearing with performance test; Generate Active Performance and keep watch on message; And keep watch on control channel through said Active Performance and send said Active Performance supervision message.

According to another aspect, the invention provides a kind of equipment, comprising: logic is used for: keep watch on control channel through sending a request message with signal to remote equipment notice Active Performance; Based on set up the pseudo-line that comprises Active Performance supervision control channel from the response message of said remote equipment; The channel type field is inserted in each the control word of a plurality of test posts, has carried the information relevant with performance test to indicate said test post; Generate test post; And send said test post through said Active Performance supervision control channel to said remote equipment and come to keep watch on one's own initiative said pseudo-line, wherein, said pseudo-line comprises said Active Performance supervision control channel.

According to another aspect, the invention provides a kind of equipment, comprising: be used for device to network equipment indication Active Performance surveillance coverage and pseudo wire emulation ability; Be used for keeping watch on the device of control channel based on the Active Performance of setting up pseudo-line from the response of the said network equipment and being associated with said pseudo-line; And be used for keeping watch on the device of message through said pseudo-line exchange Active Performance.

According to another aspect, the invention provides a kind of equipment, comprising: logic is arranged to: receive the announcement label mapping message from the network equipment, the request of said announcement label mapping message is set up Active Performance and is kept watch on control channel; Send the answer label mapping message in response to said announcement label mapping message to the said network equipment; Foundation comprises the pseudo-line of Active Performance supervision control channel; And being received in the test post that comprises the channel type field in the control word of test post, said channel type field indicates said test post to carry the information relevant with performance test.

Description of drawings

Fig. 1 shows the network that wherein can realize Active Performance supervision (APM);

Fig. 2 is the block diagram of provider edge (PE) router and provider's exchange (PS) router of Fig. 1;

Fig. 3 is the exemplary functional block diagram of the assembly that is included in PE and the PS router of Fig. 1 or realized by PE and the PS router of Fig. 1;

Fig. 4 is the exemplary functional block diagram of the forwarding logic of Fig. 3;

Fig. 5 A illustrates the example packet of the pe router that can arrive Fig. 1;

Fig. 5 B illustrates the example packet with the MPLS header between two headers that are inserted in Fig. 5 A;

Fig. 5 C illustrates the exemplary configurations of the MPLS header of Fig. 5 B;

Fig. 6 illustrates the exemplary functional block diagram of the logical routing of Fig. 3;

Fig. 7 has described the exemplary expression of some assemblies of pseudo-line and Fig. 1;

Fig. 8 shows the exemplary functional block diagram of the pseudo-line logic of Fig. 6;

Fig. 9 A shows the example format of tag distribution protocol (LDP) message;

Fig. 9 B has described to be used for the example format of pressure/optional parameter field of Fig. 9 A;

Fig. 9 C shows the example format of forwarding equivalence class (FEC) type lengths values (tlv) that is used for Fig. 9 B;

Figure 10 A and Figure 10 B show the exemplary configurations of pseudo-line (PW) ID FEC element and general PW IDFEC element respectively;

Figure 10 C shows the exemplary configurations of the interface parameters TLV of Figure 10 B;

Figure 11 A illustrates the example virtual circuit control of the LDP message that is used for setting up pseudo-line and confirms (VCCV) parameter field;

Figure 11 B shows the exemplary arrangement of control word in the control messages;

Figure 11 C shows the exemplary configurations of the PW associated channel header of Figure 11 B;

Figure 12 shows the example process that is used for setting up to pseudo-line (PE) emulation the APM control channel;

Figure 13 shows the example process that is used to write LDP message, and this LDP message can be delivered to another pe router from a pe router with PWE and APM ability; And

Figure 14 illustrates and is used to use the APM control channel to exchange the example process of APM message.

Embodiment

Following detailed is with reference to accompanying drawing.Same reference numerals in different accompanying drawings can be represented identical or similar element.(BFD) can be illustrated in forward direction and the inverse direction and to keep watch on route or data routing like term used herein " two-way forwarding detection " to find fault or unusual.

Here the Active Performance that described implementation can relate to the performance that is used to keep watch on pseudo-line is kept watch on the foundation and/or the use of (APM) control channel.

Fig. 1 illustrates the network 100 that can realize the APM control channel therein that is in data link layer level (that is the second layer in the OSI(Open Systems Interconnection) network model).Network 100 can comprise leaves over

network

102 and 104, IP/MPLS network 106 and

attachment circuit

108 and 110.

Leave over

network

102 and 104 can comprise be used to provide such as, for example, the equipment of the local network services of Ethernet, ATM, frame relay and/or Time Division Multiplexing and so on and/or system.Shown in further among Fig. 1, leave over

network

102 and 104 and can comprise client edge (CE) router one 12 and 114.

Ce router

112 and 114 can comprise the router that is positioned at customer rs premise, and can provide entering to leave over the inlet of

network

102 and 104 and withdraw from the outlet of leaving over

network

102 and 104.

IP/MPLS network 106 can comprise equipment and/or the system that Fast Packet Switch is provided.As shown in fig. 1, IP/MPLS network 106 can comprise provider edge (PE) router one 16 and 118 and provider exchange (PS) router one 20 and 122.Pe

router

116 and 118 can comprise can be provided entering and withdraw from the inlet of IP/MPLS network 106 and/or the router of outlet.PS router one 20 and 122 can comprise to be accepted the IP/MPLS grouping and they is routed to the router of their destination equipment.

Attachment circuit

108 and 110 can comprise the combination that is used for leaving over hardware, software and/or hardware and software that

network

102 and 104 is docked with IP/MPLS network 106.Go to and can pass

attachment circuit

108 and 110 to move into and to shift out IP/MPLS network 106 from the grouping of leaving over

network

102 and 104.

Can be forwarded to another equipment (for example, ce router 114) of leaving in the network 104 via the equipment (for example, ce router 112) that IP/MLPS network 106 will divide into groups from leave over network 102.In order to transmit the grouping that arrives through

attachment circuit

108 and 110, IP/MPLS network 106 can be set up the network path that is called as pseudo-line, and can be via this puppet circuit by grouping.

Pe router 116/118 can be set up pseudo-line and pass through this puppet circuit by grouping.In addition, pe router 116/118 can be through being provided with and using Active Performance to keep watch on (APM) control channel and keep watch on one's own initiative pseudo-line in the band (that is, in the same channel of carrying client network business).Through using the APM control channel, can assess network traffic conditions, such as handling capacity, time delay (that is, postponing), packet loss, shake (that is, because the packet arrives change of time that network congestion causes).

Fig. 2 illustrates the block diagram of pe router 116/118 and the PS router one 20/122 of Fig. 1, is hereinafter referred to as " PE/PS router one 16-122 ".Each of PE/PS router one 16-122 can comprise processor 202, storer 204, line interface 206 and 208, interconnection 210 and bus 212.

Processor 202 can comprise one or more processors, microprocessor, special IC (ASIC), field programmable gate array (FPGA) and/or the processing logic of optimizing with communicating by letter to networking.Processor 202 can be handled and divide into groups and/or network path-related information.Storer 204 can comprise such as the static memory of ROM (read-only memory) (ROM), carry (onboard) buffer memory such as the dynamic storage and/or the plate of random-access memory (ram), is used to store data and machine readable instructions.Storer 204 can also comprise memory device, such as floppy disk, CD ROM, CD read/write (R/W) dish and/or flash memory, and the memory device of other type.Line interface 206 and 208 can comprise and be used for receiving the equipment that divides into groups and be used for dividing into groups to the network emission that gets into from network.Interconnection 210 can comprise one or more switches or switching fabric, and this switch or switching fabric are used for the routing information based on grouping destination and storage, will get into to divide into groups to be delivered to line interface 208 from line interface 206.Bus 212 can comprise such path: the communication between components of each of this path permission PE/PS router one 16-122.

Fig. 3 be included in each of PE/PS router one 16-122 or by the exemplary functional block diagram of the assembly of each realization of PE/PS router one 16-122.As shown in the figure, PE/PS router one 16-122 can comprise buffer-manager 302, forwarding logic 304 and logical routing 306.Buffer-manager 302 can be provided for making the impact damper that gets into packet queue.Arrive simultaneously if divide into groups, then can be with one or more packet memory in impact damper, until the grouping of having handled and/or having launched higher priority.Forwarding logic 304 can comprise and being used for based on hardware and/or the software of routing iinformation with the suitable output port on direct packets line interface 206 or 208 one.Logical routing 306 can comprise and be used for communicating hardware and/or the software that is stored in tag information base (LIB) with the collection routing iinformation and with routing iinformation with other router.

Fig. 4 is the exemplary functional block diagram of forwarding logic 304.As shown in the figure, forwarding logic 304 can comprise MPLS logic 402, tag forwarding information base (LFIB) 404 and LIB 406.MPLS logic 402 can comprise that the header information that is used for being stored based on LFIB 404 and LIB 406 checks hardware and/or the software that gets into the header that divides into groups and be used for sending to suitable output port grouping with path/routing iinformation.LFIB 404 and LIB 406 can comprise the form and/or the database of the network path that is called as label switched path (LSP), and/or routing iinformation.LFIB 404 can comprise the frequent part of using of LIB 406, and can be littler than LIB 406.

MPLS logic 402 can be to operate as pe router 116, pe router 118, PS router one 20 or PS router one 22 according to its host router, carries out different routing programs.Divide into groups and its network configuration according to getting into, host router possibly operated as pe router 116 or PS router one 20 in different instances.If host router is operated as pe router 116, then as following, MPLS logic 402 can become MPLS to divide into groups the packet switched that gets into network 106 through add the MPLS header to dividing into groups.On the contrary, MPLS logic 402 can be changed 106 the MPLS of exitting network and divides into groups through peeling off MPLS header that MPLS divides into groups.

Fig. 5 A illustrates the example packet 500 that can arrive pe router 116.As shown in the figure, grouping 500 can comprise L2 header 502 (that is the packet header of osi layer level 2) and L3 header 504 (that is the packet header of osi layer level 3).Divide into groups 500 the time when receiving, MPLS logic 402 can come together to confirm the next destination of grouping 500 based on this classification with 500 types of being included into that divide into groups together with canned data among LFIB 404 and/or the LIB 406.In addition, illustrated like Fig. 5 B, MPLS logic 402 can be inserted MPLS header 506 between L2 header 502 and L3 header 504, and can divide into groups 500 via line interface 206 or 208 (Fig. 2) emission.At pe router 118 places, shown in Fig. 5 B, if divide into groups 500 to arrive to withdraw from IP/MPLS network 106, then MPLS logic 402 can be peeled off MPLS header 506, causes the grouping 500 shown in Fig. 5 A, and can send to network 104 and divide into groups 500.

If host router is as PS router one 20 operation, then MPLS logic 402 can be on the MPLS of received grouping header 506 executable operations, and can send (that is route) these groupings based on MPLS header 506.This operation can comprise creating another MPLS header and being right after MPLS header 506 inserts this another MPLS header, changes MPLS header 506 and/or remove MPLS header 506 with another MPLS header.

Fig. 5 C illustrates the structure of the MPLS header 506 that can comprise label 508.In PS router one 20; Label 508 can accomplish that index among LFIB 404 or the LIB406 is to confirm operation (that is, create and insert MPLS header, change the MPLS header, perhaps remove the MPLS header with another MPLS header) and next destination by MPLS logic 402 usefulness.Because (for example, at specific PS router one 20 or 122 places) can be carried out a lot of operations on this divides into groups during dividing into groups through IP/MPLS network 106, possibly have MPLS header 506 more than one so divide into groups.Yet, when grouping deviated from network 106, can remove the MPLS header.

Fig. 6 shows the exemplary functional block diagram of the logical routing 306 of Fig. 3.As shown in the figure, logical routing 306 can comprise tag distribution protocol (LDP) logic 602, pseudo-line logic 604 and other logic 606.

LDP logic 602 can comprise hardware and/or the software that is used for sharing with other PE that comprises the LDP logic and PS router label.As in greater detail following, pseudo-line logic 604 can comprise hardware and/or the software that is used to set up pseudo-line.Other logic 606 can comprise the hardware/software that is used to realize other ability of being associated with logical routing 306, and other ability is sent such as quality-of-service packet.

LDP logic 602 can be executed specific collection of programs (that is LDP agreement) and be used to exchange the message (for example, LDP message) about label.Through the exchange of LDP message, the LIB of each router in the IP/MPLS network 106 can be filled route and label information, and the PE of participation and PS router can be observed this route and label information.

Briefly, LDP message can comprise with forwarding equivalence class (FEC) with each FEC the relevant information of label of be associated (that is, binding).At pe router 116 places, for example, each FEC can represent from the grouping of external network can be included into the class.Through in FEC and based on the label that is associated with FEC, sending group classifying with charge free grouping, IP/MPLS network 106 can provide along with the adjustable route service of Packet Service that increases.

If FEC and label information that LDP logic 602 usefulness in the pe router 116 are propagated from pe router 118 are filled its LIB 406; Then for the grouping that arrives pe routers 116 from attachment circuit 108, can confirm from pe router 116 to pe router 118 label switched path (LSP).Similarly; If LDP logic 602 usefulness in the pe router 118 are filled its LIB 406 from the FEC and the label information of pe router 116; Then for the grouping that arrives pe routers 118 from attachment circuit 110, can confirm from pe router 116 to pe router 118 LSP.Each of two LSP between pe router 116 and the pe router 118 can be operated as MPLS tunnel (for example, such path: the inlet point of MPLS header number in this path in this path, dividing into groups can be identical with the exit point place).

Get back to Fig. 6, if logical routing 306 receives or sends and the FEC and/or the relevant information of label that are used to leave over network packet, then pseudo-line logic 604 can be called LDP logic 602.More specifically, pseudo-line logic 604 can be created or exchange and FEC and/or be tied to the relevant LDP message of label of this FEC, this FEC with leave over network packet and be associated.The result of LDP message in return, pseudo-line logic 604 can be set up two LSP on MPLS tunnel described above.These two LSP can form bi-directional pseudo-wire, and wherein each LSP can be unidirectional, and can on the direction opposite with another LSP, move.

Fig. 7 has described the exemplary expression of some assemblies of pseudo-line 702 and Fig. 1.As shown in Figure 7, pseudo-line 702 can extend to attachment circuit 110 from attachment circuit 108, and can depend on the

MPLS tunnel

704 and 706 below between pe router 116/118, extending.If be established, then pseudo-line 702 can transmit the grouping that flows into the pe router 116 from attachment circuit 108.

If packet arrives pe router 116, then pe router 116 can divide into groups to become pseudo-line to divide into groups packet encapsulation (that is conversion) through pseudo-report from a liner head is added to.Pe router 116 can be that MPLS divides into groups with packet encapsulation through adding the MPLS header, and can be through MPLS tunnel 704 this grouping of route towards the destination of this grouping.If be grouped in 704 appearance from the MPLS tunnel of pe router 118 places, then pe router 118 can come deblocking (that is, changing back) to divide into groups through removing MPLS header and pseudo-report from a liner head.Based on the information that is included in the pseudo-report from a liner head, can with or can this grouping be transmitted into attachment circuit 110.

Fig. 8 has described the exemplary functional block diagram of pseudo-line logic 604.As shown in the figure, pseudo-line logic 604 can comprise signaling logic 802, the connective affirmation of virtual circuit (VCCV) logic 804, Active Performance supervision (APM) logic 806 and/or control messages processing logic 808.As following, signaling logic 802 can comprise and be used for being used for exchanging LDP message to set up and to keep the hardware and/or the software of pseudo-line through making of LDP logic 602 and control messages.VCCV logic 804 can comprise hardware and/or the software that is used to create and use the control channel that is associated with pseudo-line.APM logic 806 can comprise hardware and/or the software that is used to create and use the APM control channel that is associated with pseudo-line.Control messages processing logic 808 can comprise hardware and/or the software that is used to transmit control message and is used to handle the control messages that can receive through pseudo-line.In different implementations, can arrange discretely or constitutional diagram 8 in assembly (for example, APM logic 806 can be included in the VCCV logic 804).

Signaling logic 802 can be through carrying out the attribute that various functions allow the sign of pseudo-line and can signal pseudo-line.This function can comprise, for example, exchanges LDP message with PS and pe router 116-122.The LDP message semantic definition with leave over FEC that network packet is associated and the label that is tied to this FEC.

Fig. 9 A shows the example format of the LDP message 900 that can be generated by signaling logic 802.In general, LDP header (not shown) can be before one or more LDP message 900, and each LDP message 900 can be taked the type lengths values (tlv) form.Shown in Fig. 9 A, LDP message 900 can comprise various field, such as unknown field 902, message type field 904, message length field 906, message id field 908 and pressure/optional parameter field 910.If unknown field 902 can specify LDP message 900 to have UNKNOWN TYPE, then whether return answer to LDP message 900.For example, if unknown field 902 is " 1 ", if when then not picking out the value in the message type field 904, then can ignore LDP message 900 at the receiving router place.Message type field 904 can be indicated LDP type of message (for example, keeping alive messages, address message, label mapping message etc.).Message length field 906 can Indication message id field 908 and pressure/optional parameter field 910 with eight hytes cumulative length that is unit.Message id field 908 can comprise the value that is used to identify LDP message 900.Pressure/optional parameter field 910 can comprise maybe parameter needs and/or optional for the value of certain message types 904.

Fig. 9 B shows and is used to force/example format of optional parameter field 910.As shown in the figure, mandatory parameters field 910 can comprise can provide classes of packets (that is FEC-TLV field 912 of, FEC) tabulating.Fig. 9 C shows the example format that is used for FEC-TLV field 912.FEC-TLV field 912 can comprise various field (for example, zero flag field 914, FEC field 916, length field 918, FEC element field 920 etc.).Zero flag field 914 can be set to constant (for example, being respectively " 0 " and " 0x0100 ") with FEC field 916.Length field 918 can comprise the value about the length of FEC element field 920.

In the LDP message that comprises about the information of pseudo-line, FEC element field 920 can comprise, for example, and PW ID FEC element, general PW ID FEC element etc.Figure 10 A and Figure 10 B illustrate the exemplary configurations of PW ID FEC element 1002 and general PW ID FEC element 1018 respectively.

Shown in Figure 10 A, PW ID FEC element 1002 can comprise PW id 1004, C element 1006, PW Class1 008, PW message length 1010, group ID 1012, PW ID 1014 and/or the sub-TLV 1016 of interface parameters.PW id 1004 can identify PW ID FEC element 1002 and can be configured to constant value (for example, " 0x80 ").C element 1006 can be specified the control word that whether has the control messages that is used for transmitting through the pseudo-line that is associated with PW ID FEC element 1002.For the pseudo-line with APM control channel, C element 1006 can be arranged for indicating the value (for example, " 1 ") that in APM message, has control word.

PW Class1 008 can be represented the type of pseudo-line.The example of PW Class1 008 can comprise " 0x0001 " that be used for frame relay, be used for " 0x0003 " of the transparent cell transmission of ATM, be used for " 0x0005 " of Ethernet etc.PW message length 1010 can be specified the cumulative length of PW ID 1014 and the sub-TLV 1016 of interface parameters.Group ID 1012 can specify the value of any 32 bits of one group of pseudo-line of expression.PW ID 1014 can identify particular pseudowire.Interface parameters sub-TLV 1016 can be used to provide the information specific to interface, such as the characteristic of attachment circuit (for example, attachment circuit 108 and 110).

Shown in Figure 10 B, general PW ID FEC element 1018 can comprise general PW id 1020, C element 1022, PW Class1 024, PW message length 1026, attachment circuit (AC) information 1028 and/or interface parameters TLV 1030.General PW id 1020 can identify general PW ID FEC element 1018 and can be configured to constant value (for example, " 0x18 ").As stated, C element 1022 and PW Class1 024 can be specified the information identical with C element 1006 and PW Class1 008.PW message length 1026 can be specified the length of attachment circuit (AC) information 1028.Attachment circuit information 1028 can be specified and this locality and remote attachment circuits, such as attachment circuit 108 address information relevant with 110.Be similar to the sub-TLV1016 of interface parameters, interface parameters TLV 1030 can be used so that the parameter specific to interface to be provided.

Figure 10 C illustrates the exemplary configurations of interface parameters TLV 1030.As shown in the figure, interface parameters TLV 1030 can comprise nil segment 1032, PW interface parameters TLV 1034, length 1036 and/or the sub-TLV 1038 of interface parameters.Nil segment 1032 can be set to constant (for example, being respectively " 0x00 " and " 0x096B ") with PW interface parameters TLV1034.Length 1036 can the sub-TLV 1038 of specified interface parameter length.As above described, can use each among the sub-TLV 1038 of interface parameters from similar purpose to the sub-TLV of interface parameters 1016.

Turn back to Fig. 8; If signaling logic 802 and its peers include both exchange LDP message, then VCCV logic 804 can be through being arranged as the VCCV parameter field the TLV 1016 of interface parameters (Figure 10 A) in the PW ID FEC element 1002 and/or in the sub-TLV 1038 of interface parameters (Figure 10 C), setting up the control channel that is used for pseudo-line.

Figure 11 A illustrates the example format of VCCV parameter field 1102.As shown in the figure, VCCV parameter field 1102 can comprise Class1 104, length 1106, control channel (CC) Class1 108 and connective affirmation (CV) Class1 110.Class1 104 can identify VCCV parameter field 1102, and can be set to eight octet value (for example, " 0x0c ").Length 1106 can provide the length (for example, 4 bytes) of VCCV parameter field 1102, and can be set to constant value (for example, " 0x04 ").

CC Class1 108 can carry 8 bit fields can receive the professional control channel (a plurality of) of control through it with the indication router type.In 8 bits of CC Class1 108 fields, each that can use bit " 0-2 " is assigned in 3 control channel types one (for example, as distributed by internet assigned number authority (IANA)).CV Class1 110 can comprise bit field, is used to verify the type of the control messages of the connectedness between the pseudo-endpoints with indication.For example; CV Class1 110 can indicate control messages can be Internet Control Message Protocol (ICMP) Ping (promptly; Echo request based on ICMP), LSP Ping (promptly; Echo request through LSP) or two-way forwarding detect (BFD) signal, it can represent to be used in forward direction and inverse direction, to keep watch on continuously route and the data routing message with the discovery fault.

Turn back to Fig. 8, if constructed pseudo-line and associated control channel, then VCCV logic 804 can be sent and/or receiving control message through this control channel.This control channel can carry in the type of message indicated in the CV Class1 110 of VCCV parameter field 1102 at the whole duration of existence of control channel.If emission control message, then VCCV logic 804 can generate the mark that is called as control word, if during the foundation of control channel, to have assigned band inner control channel by CC Class1 108 fields, then control messages and other pseudo-line is divided into groups to differentiate.

Figure 11 B shows the exemplary arrangement of control word in the control messages 1112.As shown in the figure, control word can be a PW associated channel header 1116, and can be between MPLS label stack 1120 that comprises MPLS header 1118 and L3 header 1114.Figure 11 C shows the exemplary configurations of PW associated channel header 1116.As shown in the figure, PW associated channel header 1116 can comprise nibble (nibble) 1122, version 1124, reservation 1126 and channel type 1128.Nibble 1122 can be indicated the channel that is associated with pseudo-line, and can the value of being set to (for example, " 0x01 ").Version 1124 can be a constant and can the value of being set to (for example, " 0 ") with reserving 1126.Channel type 1128 can be in three values one (for example, " 0x0021 " be used to indicate internet protocol version four (IPv4), " 0x0056 " to be used for IPv 6 (IPv6) or " 0x0006 " is used for carrying the BFD channel of the grouping that does not have Internet Protocol (IP)/UDP (UDP) header).

Turn back to Fig. 8; If signaling logic 802 and its peers include both exchange LDP message, then APM logic 806 can through VCCV parameter field 1102 (Figure 11 A) is write among PW ID FEC element 1002 (Figure 10 A) the sub-TLV 1016 of interface parameters (Figure 10 A) and/or in the sub-TLV 1038 of interface parameters (Figure 10 C) ask and be provided with the Active Performance monitoring channel.

More specifically, APM logic 806 can be write bit value " 1 " for the APM bit in the CC Class1 108 (for example, the bit " 6 " in the bit " 3-7 ").Can or can not register this to the IANA registration and can be used as the bit in the CC Class1 108 of APM bit, such as the bit in the CC Class1 108 " 0-2 " to IANA.In addition, APM logic 806 can be indicated the APM control channel that can pass through to be set up to exchange Active Performance in CV Class1 110 and kept watch on message.

In case constructed pseudo-line and related APM control channel, APM message sent, receive and/or handled to APM logic 806 just can through this APM control channel, to keep watch on the performance of related pseudo-line on one's own initiative.APM message can be carried and can be generated at the pe router place to obtain the test service such as the network performance tolerance of handling capacity, time delay, packet loss and shake.The same with the VCCV control messages, each of APM message can be carried the PW associated channel header as its control word.Yet; Form contrast with the channel type 1128 of the PW associated channel header 1116 that is used for the VCCV control messages; As indicated in the CV Class1 110 in the LDP message of exchange during the APM control channel is set up, the channel type 1128 that is used for the PW associated channel header 1116 of APM message can comprise the value of reflection Active Performance function for monitoring.

Implementation described above is provided for the exemplary active performance surveillance of pseudo-line; It comprises system element; Such as PE/PS router one 16-122, forwarding logic 304, logical routing 306, pseudo-line logic 604, signaling logic 802, VCCV logic 804 and APM logic 806, and related message structure and form.Figure 12-Figure 14 has described can be by the example process of one or more execution of these system elements.

Figure 12 shows the example process 1200 that is used to set up the APM control channel that is used for pseudo-line.Process 1200 can be to obtain beginning (frame 1202) with long-range pe router (for example, pe router 118) and the relevant parameter of attachment circuit (for example,

attachment circuit

108 and 110).In an implementation, can obtain this parameter from network manager or user.In another implementation, can obtain this parameter through dynamic auto discovery procedure.

Can obtain APM and select (frame 1204).In an implementation, can carry out the selection that is obtained by user, keeper and/or by another equipment.In other implementation, APM can be selected the default control channel as any pseudo-line that is used for being established.

Further illustrate like Figure 12, can initiate label distribution (frame 1206).In an implementation, for example, initiating label distribution can comprise: initiate and stop the LDP session, send hello messages, carry out other LDP initialize routine etc.Label distribution can comprise downstream autonomous mode and free label retention mode.In the autonomous mode of downstream, under situation not, can label and the FEC that is associated with label be transmitted into downstream router from router from the requirement of downstream router.In label retention mode, can send out the receiving router of the jumping distance between router and the receiving router and keep by being independent of the source about the information of FEC and the label that is associated with FEC.

Process 1200 can also comprise announcement PWE and APM ability (frame 1208).In an implementation, in order to announce PWE and APM ability, can generate LDP message, and send this LDP message from the pe router of initiating PWE such as label mapping message.Figure 13 illustrates the example process 1300 that is used to write LDP message, and this LDP message is delivered to another pe router with PWE and APM ability from a pe router.

As shown in Figure 13, process 1300 can comprise: in CC Class1 108, signal the bit value of being set to (frame 1302) in the CV Class1 110 in APM and VCCV parameter 1102 fields.In an implementation, for example, APM bit (that is the predetermined bit between the bit " 3-7 " in CC Class1 108) can indicate the pe router of launching to support APM.Bit in the CV Class1 110 can be indicated the type (that is APM message) of the message that can pass through the exchange of APM control channel.

Can use VCCV parameter field 1102 to form the sub-TLV 1038 of interface parameters (frame 1304).Can use the sub-TLV 1038 of interface parameters to form general PW ID FEC element 1018 or PW ID FEC element 1002 (frame 1306).In an implementation, in forming general PW ID FEC element 1018, the information about attachment circuit that obtains at frame 1202 can be used as attachment circuit information 1028 and is merged in.

Shown in further among Figure 13, can use general PW ID FEC 1018 or PW ID FEC 1002 to accomplish LDP message (frame 1308).For example, described like above combination Fig. 9 A-9C in an implementation, can use general PW ID FEC 1018 or PW ID FEC 1002 to accomplish LDP message.Process 1300 can also comprise sends LDP message (frame 1310).The LDP message that can be sent out can comprise, for example, and notification message, label request message, label release message, label mapping message etc.

Turn back to Figure 12, process 1200 can comprise receiving answers LDP message (frame 1210).In an implementation, answer LDP message and can be derived from the pe router that sends the original tag mapping message to it.If the information that the pe router at pseudo-line other end place is failed to verify in the label mapping message and comprised, then answering LDP message can be label release message.Otherwise answering LDP message can be another label mapping message.If answering LDP message is label mapping message, then CV Class1 110 fields can be indicated and supported Active Performance to keep watch on.

Can upgrade or end-tag distribution (frame 1212).In an implementation, according to LDP, said end can relate to initiation and termination LDP session, send extra LDP message etc.If pe router is accomplished the switch label mapping message and upgraded their LIB, then two of message transfer unidirectional LSP can be used as bi-directional pseudo-wire in the opposite direction.In addition, the APM control channel that is associated with pseudo-line is available.

Figure 14 illustrates the example process 1400 that is used for through APM control channel exchange APM message.As shown in the figure, process 1400 can be to obtain that the request of Active Performance test is begun (frame 1402).In an implementation, this request can be derived from the keeper at user and/or pe router place or be derived from remote equipment, or is derived from and leaves over the network equipment.From the purpose of testing characteristics of network, can prepare APM message (frame 1404).

APM message can be encapsulated as has control word (frame 1406).More specifically, can be through adding PW header (that is the MPLS header of indication PW) and carrying out encapsulation through inserting control word (that is, the PW associated channel header 1116).Discuss and decide by the terminal pe router during setting up according to pseudo-line, control word can comprise the channel type 1128 of indication Active Performance supervision.

Shown in further among Figure 14, APM message can be encapsulated as has the MPLS header (frame 1408), and this APM message can be sent out (frame 1410).In an implementation, the APM message of encapsulation can arrive the destination pe router, and it can respond APM message through answering APM message.The pe router that sends original APM message can receive answers APM message, and can confirm pseudo-dimension amount based on answering characteristic (for example, answer APM message and arrive required time quantum), such as handling capacity, time delay, packet loss or shake.With this mode, use the Active Performance of band inner control channel to keep watch on continuous (or discontinuous) supervision that can allow PW.

In conjunction with above Fig. 1,7,9A-9C, 10A-10C and the described implementation of 11A-11C of combining, being used to of combining more than that Figure 12-14 describes sets up and uses the example process of APM control channel to be further specified through following example.Suppose that leaving over

network

102 and 104 for two is the ethernet networks that can set up communication channel through the pe router in the IP/MPLS network 106 116 and 118.In addition, suppose that

pe router

116 and 118 can adopt the communication media of pseudo-line as them.

At pe router 116 places, can obtain the parameter relevant through automatic discovery procedure with long-range pe router 118 and its attachment circuit 110.In addition, pe router 116 can obtain to instruct the APM control channel that is used for testing on one's own initiative and keeping watch on pseudo-line with foundation.

If pe router 116 has obtained parameter, then pe router 116 can initiate label distribution, can begin and close on the LDP session of PS router one 20 and can send label mapping message.Label mapping message can comprise the information with illustrated form among Fig. 9 A-9C, 10A-10C and the 11A.PS router one 20 can be forwarded to another PS router with label mapping message successively.PS router in the IP/MPLS network 106 can continue to propagate label mapping message and receive label mapping message until pe router 118.

If pe router 118 receives label mapping message, then pe router 118 can be verified the content of label mapping message.When successfully verifying, the label mapping message that pe router 118 can upgrade its LIB and can send himself is as answer.This answer can comprise the value of the CC Class1 108 of signaling the APM control channel, as doing from the label mapping message of pe router 116.The value of CV Class1 110 can indicate APM message to be carried through the APM control channel.

If checking is unsuccessful, then pe router 118 can send label release message.When receiving answer from pe router, pe router 116 can upgrade the LIB of himself.Through the exchange of previous label mapping message, can set up bi-directional pseudo-wire.

Be at pseudo-line under the situation of appropriate location, pe router 116 can receive request to keep watch on pseudo-line from the network manager.Pe router 116 can be write APM message, and can encapsulate this message.This encapsulation can relate to inserts control word (for example, being used to from the selected control messages type of answering among the control messages type in the CV Class1 110 in the label mapping message channel type 1128 is set) and additional PW header.The message of this encapsulation can further be encapsulated as has the MPLS header.According to the content of APM message, pe router 116 can send the APM message that obtains to pe router 118, and this can respond APM message.Pe router 116 can continue to send extra APM message and be terminated until performance monitoring.

Above example description in the band APM control channel can how be established and how be used to send APM message through pseudo-line.In addition, aforementioned description to implementation provides explanation, but and is not intended to limit or implementation is limited to disclosed exact form.It is possible revising and change in view of above instruction, perhaps can from the practice of this instruction, obtain.

For example, although Fig. 8 in signaling logic 802 shown in the pseudo-line logic 604, VCCV logic 804 and APM logic 806, in other implementation, signaling logic 802, VCCV logic 804 and APM logic 806 can have the different functions classification.For example, signaling logic 802 can comprise VCCV logic 804, and VCCV logic 804 in turn can comprise APM logic 806.

In addition, although to the illustrated process prescription of Figure 12-14 a series of action, can be modified at the order that moves described in other implementation.For example, can before frame 1202, carry out frame 1204.In addition, non-dependent acts can represent can executed in parallel action.For example, can executed in

parallel frame

1202,1204 and 1206.In another example, can executed in

parallel frame

1302,1304 and 1306.

It is obvious that, can realize described aspect here with the different form of software, firmware and hardware in the implementation illustrated in many and the accompanying drawing.Be used to realize that the actual software code of these aspects or special-purpose control hardware do not limit the present invention.Therefore, under situation not, the operation and the behavior of these aspects have been described with reference to specific software code---should be appreciated that and can come design software and control hardware based on the description here to realize these aspects.

In addition, some part of these implementations has been described to carry out " logic " of one or more functions.This logic can comprise hardware, such as processor, special IC or field programmable gate array, and the combination of software or hardware and software.

It is crucial or basic that employed in this application any element, action or instruction should not be interpreted as described implementation here, and removing is far from it clearly describes.And as used herein, the item that does not add numeral-classifier compound is intended to comprise one or more.When only referring to one, use a technical term " one " or similar language.In addition, phrase " based on " be intended to mean " at least in part based on ", only if explicit state is arranged in addition.

Claims

1. method that is used for the pseudo wire emulation performance monitoring comprises:

Transmit the announcement label mapping message to the network equipment, the request of said announcement label mapping message is set up Active Performance and is kept watch on control channel;

The answer label mapping message that processing response is sent in said announcement label mapping message and from the said network equipment;

The Active Performance of setting up pseudo-line and being associated with said pseudo-line is kept watch on control channel;

Generate Active Performance and keep watch on message, comprise that the channel type field is inserted into said Active Performance keeps watch in the control word of message, to have indicated the said Active Performance information relevant of having kept watch on message bearing with performance test;

Keep watch on control channel through said Active Performance and send said Active Performance supervision message; And

Use said Active Performance to keep watch on control channel and come to keep watch on one's own initiative said pseudo-line.

2. method according to claim 1, wherein, keep watch on said pseudo-line on one's own initiative and comprise at least one in the assessment the following:

Handling capacity, time delay, packet loss and shake.

3. method according to claim 1, wherein, transmit said announcement label mapping message to the said network equipment and comprise:

Bit value is included in virtual circuit in the said announcement label mapping message is connective confirms that the connectedness among the parameter field confirms in the type field, said bit value indication is used to verify the type of the control messages of the connectedness between the pseudo-endpoints.

4. method according to claim 1, wherein, handle said answer label mapping message and comprise:

Connectedness based among the connective affirmation of the virtual circuit in the said answer label mapping message parameter field is confirmed the value in the type field, confirms whether the said network equipment supports Active Performance to keep watch on.

5. method according to claim 1, wherein, transmit said announcement label mapping message to the said network equipment and comprise:

Bit is inserted in the connective control channel type field of confirming among the parameter field of virtual circuit in the said announcement label mapping message.

6. method according to claim 1, wherein, handle said answer label mapping message and comprise:

Based on the value in the control channel type field among the connective affirmation of the virtual circuit in the said answer label mapping message parameter, confirm whether the said network equipment supports said Active Performance to keep watch on control channel.

7. equipment that is used for the pseudo wire emulation performance monitoring comprises:

Be used for sending the device of the request message of setting up Active Performance supervision control channel to remote equipment;

Be used for based on the device of setting up the pseudo-line that comprises Active Performance supervision control channel from the response message of said remote equipment;

Be used to generate the device of a plurality of test posts, comprise being used for the channel type field is inserted in each the control word of said a plurality of test posts, carried the device of the information relevant with performance test to indicate said test post; And

Be used for keeping watch on control channel and send the device that said test post keeps watch on one's own initiative said pseudo-line to said remote equipment through said Active Performance,

Wherein, said pseudo-line comprises said Active Performance supervision control channel.

8. equipment according to claim 7, wherein, described request message comprises:

In pseudo-line ID forwarding equivalence class type lengths values element and the general pseudo-line ID forwarding equivalence class type lengths values element at least one.

9. equipment according to claim 8, wherein, said general pseudo-line ID forwarding equivalence class type lengths values element comprises:

Interface parameters subtype length value.

10. equipment according to claim 9, wherein, said interface parameters subtype length value comprises:

The connective affirmation of virtual circuit parameter field.

11. equipment according to claim 7, wherein, said response message comprises:

The control channel type field; And

Connective affirmation type field.

12. equipment according to claim 7 further comprises:

Ply-yarn drill, said ply-yarn drill send to the circuit that is connected to said equipment and divide into groups and divide into groups from the circuit reception that is connected to said equipment.

13. equipment according to claim 12, wherein, said circuit comprises one at least one attachment circuit that is used for asynchronous transfer mode grouping, frame relay grouping or time division multiplex grouping.

14. an equipment that is used for the pseudo wire emulation performance monitoring comprises:

Be used for device to network equipment indication Active Performance surveillance coverage and pseudo wire emulation ability;

Be used for keeping watch on the device of control channel based on the Active Performance of setting up pseudo-line from the response of the said network equipment and being associated with said pseudo-line; And

Be used for keeping watch on the device of message through said pseudo-line exchange Active Performance.

15. an equipment that is used for the pseudo wire emulation performance monitoring comprises:

Be used for receiving from the network equipment device of announcement label mapping message, the request of said announcement label mapping message is set up Active Performance and is kept watch on control channel;

Be used for sending the device of answering label mapping message to the said network equipment in response to said announcement label mapping message;

Be used to set up the device of the pseudo-line that comprises Active Performance supervision control channel; And

The control word that is used for being received in test post comprises the device of the test post of channel type field, and said channel type field indicates said test post to carry the information relevant with performance test.

16. equipment according to claim 15 further comprises:

Be used to use said Active Performance to keep watch on the device that control channel keeps watch on one's own initiative said pseudo-line.

17. equipment according to claim 16 further comprises:

Be used for assessing at least one device of handling capacity, time delay, packet loss and shake.