WO2011085693A1 - 伪线建立方法、系统及设备 - Google Patents

伪线建立方法、系统及设备 Download PDF

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Publication number
WO2011085693A1
WO2011085693A1 PCT/CN2011/070308 CN2011070308W WO2011085693A1 WO 2011085693 A1 WO2011085693 A1 WO 2011085693A1 CN 2011070308 W CN2011070308 W CN 2011070308W WO 2011085693 A1 WO2011085693 A1 WO 2011085693A1
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WO
WIPO (PCT)
Prior art keywords
information
pseudowire
forwarding device
pseudowires
label mapping
Prior art date
Application number
PCT/CN2011/070308
Other languages
English (en)
French (fr)
Inventor
邱超娃
薛莉
刘长宝
曹玮
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15176388.5A priority Critical patent/EP2963867B1/en
Priority to JP2012548331A priority patent/JP5600182B2/ja
Priority to EP11732683.5A priority patent/EP2525536B1/en
Publication of WO2011085693A1 publication Critical patent/WO2011085693A1/zh
Priority to US13/548,880 priority patent/US9160655B2/en
Priority to US14/640,841 priority patent/US9391882B2/en
Priority to US15/185,982 priority patent/US9912586B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/68Pseudowire emulation, e.g. IETF WG PWE3
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/22Alternate routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/28Routing or path finding of packets in data switching networks using route fault recovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/50Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/74Address processing for routing
    • H04L45/745Address table lookup; Address filtering

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, system and device for establishing a pseudowire. Background technique
  • Pseudo-Wire Emulation Edge to Edge (PWE3) technology has proposed Multi-Segment Pseudo-Wire (MS-PW) technology, mainly through forwarding edge devices (Switching PE, S- PE, hereinafter referred to as the forwarding device), addresses the pressure of the aggregation device and solves the cross-domain and security problems of network deployment.
  • PWE3 Pseudo-Wire Emulation Edge to Edge
  • MS-PW Multi-Segment Pseudo-Wire
  • TPE1 sends a label mapping message (label mapping) to establish a multi-segment pseudowire from TPE1 to TPE3.
  • TPE1 sends a label mapping message to establish another multi-segment pseudowire from TPE1 to TPE4.
  • a multi-segment pseudowire is the main pseudowire;
  • TPE3 or TPE4 After receiving the label mapping packet, TPE3 or TPE4 completes the establishment of the reverse pseudowire to TPE1.
  • the embodiment of the invention provides a method, a system and a device for establishing a pseudowire, which speeds up the pseudowire protection switching process between user edge devices and saves network resources.
  • the embodiment of the invention provides a method for establishing a pseudowire, which includes:
  • the label mapping message includes: information of the forwarding device at the branching position, and information of at least two next hops or at least two outbound interfaces of the forwarding device at the forked position;
  • Parsing the label mapping message to obtain the forwarding device information in the branching position, and the information of the at least two next hops or at least two outbound interfaces;
  • the embodiment of the invention provides a method for establishing a pseudowire, which includes:
  • the pseudo-line entry information includes: a correspondence between the first destination address and the at least two next hop addresses, or at least two different ones to the first destination address corresponding device Pseudo line by information;
  • the pseudowire establishment signaling When receiving the pseudowire establishment signaling, the pseudowire establishment signaling requests to establish a pseudowire to the first destination address corresponding device, according to the at least two next hop addresses, or to the first destination address. At least two pseudowires are established from the local device corresponding to at least two different routing information of the device.
  • the embodiment of the invention provides a forwarding device, including:
  • a packet receiving unit configured to receive a label mapping message, where the label mapping message includes: forwarding device information at a forked position, and at least two next hops or at least two of the forwarding devices at the forked position Information about the outgoing interface;
  • a parsing unit configured to parse the label mapping message received by the packet receiving unit to obtain the forwarding device information in the bifurcation position, and information of at least two next hops or at least two outbound interfaces
  • a matching establishing unit configured to compare the forwarding device information in the branching position obtained by the parsing unit with the local device information, and if they match, according to the information of the at least two next hops or at least two outbound interfaces The forwarding device establishes at least two pseudowires.
  • An embodiment of the present invention provides a TEP of a service provider's terminating edge device, including: a message generating unit, configured to generate a label mapping message, where the label mapping message includes: forwarding device information at a forked position, and Information of at least two next hops or at least two outbound interfaces of the forwarding device in the forked position; a forwarding device that matches the forwarding device information in the forked position according to the two next hops Or at least two outgoing interface information establishes at least two pseudowires from the forwarding device.
  • the embodiment of the invention provides a forwarding device, including:
  • a correspondence forming unit configured to form a pseudo-line by entry information, where the pseudo-line entry information includes: a correspondence between a first destination address and at least two next hop addresses, or corresponding to the first destination address At least two different routing information of the device;
  • a pseudowire establishing unit configured to: when receiving the pseudowire establishing signaling, the pseudowire establishing signaling request to establish a pseudowire to the first destination address corresponding device, and forming a first purpose according to the corresponding relationship forming unit
  • the address corresponds to at least two next hop addresses, or at least two different routing information to the device corresponding to the first destination address, and at least two pseudowires are established from the local device.
  • An embodiment of the present invention provides a pseudowire establishment system, including a forwarding device and a service provider's termination edge device TPE;
  • the terminating edge device (TPE) of the service provider is configured to generate a label mapping message, where the label mapping message includes forwarding device information at a forked position, and at least two next hops of the forwarding device at the forked position. Or at least two outbound interface information; sending the generated label mapping message to the forwarding device;
  • the forwarding device is configured to receive a label mapping message, parse the label mapping message to obtain forwarding device information at a forked position, and at least two next hops or at least two out of the forwarding device at the forked position
  • the information of the interface is compared with the local device information, and if they match, at least two are established from the forwarding device according to the information of the at least two next hops or at least two outbound interfaces. Pseudo-line.
  • the method for establishing a pseudowire in this embodiment is applicable to the establishment of a pseudowire in the MS-PW system, and the method includes: the forwarding device receives the label mapping packet sent by the TPE directly connected to the user edge device, and parses the forwarding device information in the bifurcation position.
  • At least two next hops of the forwarding device or at least two outbound interfaces, and at least two pseudowires are established from the forwarding device according to the information of the at least two next hops or at least two outbound interfaces.
  • the TPE needs to send a label mapping packet to establish at least two pseudowires.
  • the TPE sends a label mapping packet to establish a pseudowire.
  • the pseudowire establishing method of this embodiment requires multiple pseudowires between the forwarding device at the branching position and the destination node, which can save network resources and provide efficient protection of the MS-PW;
  • the two forwarding devices are established in the branching device to complete the establishment of multiple MS-P W segments, and the primary and secondary identifiers of the MS-PW segment can be implemented.
  • the fast protection switching of the MS-PW can be implemented on the forwarding device. In this way, the process of fast recovery of the pseudowire can be speeded up, and the segment protection of the MS-PW can be provided from the forwarding device in the branching position to better utilize the network resources.
  • Figure 1 a is a schematic structural diagram of a networking system constructed by MS-PW;
  • Figure lb is a schematic structural diagram of a networking system constructed by another MS-PW;
  • FIG. 2 is a flowchart of a method for establishing a pseudowire according to Embodiment 1 of the method of the present invention
  • Embodiment 3 is a flowchart of a method for establishing a pseudowire provided by Embodiment 2 of the method of the present invention
  • FIG. 4 is a schematic diagram of additional information Sub-TLV in the embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for establishing a pseudowire provided by Embodiment 3 of the method of the present invention.
  • FIG. 6 is a schematic structural diagram of an MS-PW system to which a pseudowire establishing method according to an embodiment of the present invention is applied;
  • FIG. 7 is a schematic structural diagram of a forwarding device according to Embodiment 1 of the device of the present invention.
  • Embodiment 8 is a schematic structural diagram of another forwarding device according to Embodiment 1 of the device of the present invention
  • 9 is a schematic structural diagram of a TPE provided in Embodiment 2 of the device of the present invention.
  • FIG. 10 is a schematic structural diagram of another TPE provided by Embodiment 2 of the device of the present invention.
  • FIG. 11 is a schematic structural diagram of a forwarding device according to Embodiment 3 of the device of the present invention.
  • FIG. 12 is a schematic structural diagram of another forwarding device according to Embodiment 3 of the present invention
  • FIG. 13 is a schematic structural diagram of a pseudowire establishing system according to an embodiment of the present invention. detailed description
  • a method for establishing a pseudowire the method in this embodiment can be applied to the MS-PW system shown in FIG. 1a.
  • the multi-segment pseudowire MS-PW between CE1 and CE2 there is one forwarding device SPE2 and two respectively.
  • the forwarding device SPE2 can reach TPE2 through different outbound interfaces.
  • the flowchart of the method in this embodiment is as shown in FIG. 2, and includes: Step 101: The forwarding device receives the label mapping packet, where the label mapping packet includes: forwarding device information in a forked position, and forwarding in a forked position Information of at least two next hops or at least two outbound interfaces of the device;
  • the forwarding device in the branching position is a forwarding device that implements redundant protection of the pseudowire.
  • the forwarding device can be connected to two different TPE devices. As shown in FIG. 1a, the forwarding device in the forked position is SPE2. Connected to TPE3 and TPE4 respectively; or the forwarding device can reach the same next hop device through different outbound interfaces, as shown in Figure lb, the forwarding device SPE2 in the forked position passes through the outbound interfaces 1 and 2 and the lower One hop device TPE2 is connected.
  • the explicit mapping information may be included in the label mapping message for performing explicit routing information distribution, such as identifying the primary and secondary information for establishing at least two pseudowires.
  • Step 102 The forwarding device parses the label mapping message to obtain forwarding device information in a forked position, and information of at least two next hops or at least two outbound interfaces.
  • the forwarding device information in the forked position is obtained by parsing the label mapping message, and When at least two next hops or at least two outbound interfaces are used, the explicit path information such as type, length, and value (Type Length Value, TLV) in the label mapping message can be parsed (Sub) -TLV) information.
  • the forwarding device information may be a device identifier or the like, and the information of the next hop may be information such as a device network protocol (IP) address.
  • IP device network protocol
  • Step 103 The forwarding device compares the forwarding device information in the branching position with the local device information, and if they match, establishes at least two pseudowires from the forwarding device according to the information of the at least two next hops or at least two outbound interfaces; If the forwarding device is not in the forked position, the label mapping packet is forwarded to the node device of the next hop to complete the establishment of the MS-PW segment.
  • the forwarding device information in the branching position matches the local device information, it indicates that the forwarding device is the forwarding device in the forked position, corresponding to SPE2 in FIG.
  • a pseudowire is established, or a pseudowire is established on the forwarding device through at least two outbound interfaces and the next hop TPE device.
  • the number of pseudowires established is less than or equal to the number of next hops, or less than or equal to the number of outgoing interfaces. For example, when there are 4 next hop information, 2 or 3 or 4 pseudo-parses can be established. line.
  • one of the pseudowires may be set as a main pseudowire according to a preset strategy, and other pseudowires are set as pseudowires. In this way, after the pseudowire is established, when the forwarding device in the branching position determines that the main pseudowire fails, the fast protection switching of the pseudowire can be directly completed.
  • the method for establishing a pseudowire in this embodiment is applicable to the establishment of a pseudowire in the MS-PW system, and the method includes: the forwarding device receives the label mapping packet sent by the TPE directly connected to the user edge device, and parses the forwarding device information in the bifurcation position. And information of at least two next hops or at least two outbound interfaces of the forwarding device, and establishing at least two pseudowires from the forwarding device according to information of at least two next hops or at least two outbound interfaces.
  • the TPE needs to send a label mapping packet to establish at least two pseudowires.
  • the TPE sends a label mapping packet to establish a pseudowire.
  • the pseudowire establishing method in this embodiment is to establish a plurality of pseudowires between the forwarding device in the branching position and the destination node, so that the resources consumed by the pseudowire establishment can be reduced.
  • the two forwarding devices are established in the branching device to complete the establishment of multiple MS-PW segments, and the identifiers of the active and standby MS-PW segments can be implemented.
  • it can be on the forwarding device.
  • Implement fast protection switching of MS-PW In this way, the process of fast recovery of the pseudowire can be speeded up, and the segment protection of the MS-PW can be provided from the forwarding device in the branching position to better utilize the network resources.
  • the forwarding device may acquire the active/standby relationship information of the at least two pseudowires before establishing at least two pseudowires in step 103, and establish at least two pseudowires according to the active/standby relationship information.
  • the information in the Sub-TLV in the received label mapping packet is directly parsed, and the primary and backup pseudowire information sent by the user edge device is received, and the main information in the active/standby pseudowire information notification is parsed.
  • the pseudowire information is obtained, and may be acquired according to a preset policy. This does not limit the embodiment of the present invention.
  • a method for establishing a pseudowire the method in this embodiment can be applied to the MS-PW system shown in FIG. 1a.
  • the multi-segment pseudowire MS-PW between CE1 and CE2 there is one forwarding device SPE2 and two respectively.
  • the forwarding device SPE2 can reach TPE2 through different outbound interfaces.
  • the flowchart of the method in this embodiment is as shown in FIG. 3, and includes: Step 201: TPE1 generates a label mapping packet, where the label mapping packet includes forwarding device information at a forked position, and a forwarding device at a forked position. Information of two next hops or at least two outbound interfaces;
  • the TPE configures the source attachment individual identifier (SAII), the attachment group identifier (AGI), the TAII information, and the users arriving at the peer end when performing explicit route advertisement. Explicit path information for the TPE directly connected to the edge device.
  • the forwarding device in the branching position refers to a forwarding device that implements redundant protection of the pseudowire.
  • the TPE passes the at least two multi-segment pseudowires.
  • the device compares and obtains the forwarding device information in the bifurcation position.
  • the TPE adds the additional information (Sub-TLV) to the explicit path information TLV in the label mapping message, that is, the sub-TLV;
  • the information Sub-TLV carries forwarding device information in a forked position, and information of at least two next hops or at least two outgoing interfaces of the forwarding device.
  • FIG. 4 it is a structural diagram of a specific Sub-TLV, where Value can be an IPv4 address or an IPv6 address.
  • Step 202 The TPE sends the generated label mapping message to the forwarding device, so as to match the forwarding device that is in the forked position forwarding device, according to at least two next hops or at least two outbound interfaces.
  • the information establishes at least two pseudowires from the forwarding device.
  • the method for establishing a pseudo-line after the forwarding device receives the generated label mapping message is as described in the first embodiment of the method, and details are not described herein again.
  • the TPE can also carry the active/standby relationship information of the multiple pieces of pseudowires between the user edge devices in the Sub-TLV in the label mapping message, so that the forwarding device in the forked position receives the label mapping message according to the The active/standby relationship information sets at least two pseudowires.
  • the TPE may also send the primary and backup pseudowire information to the forwarding device to notify the active/standby situation of at least two pseudowires established from the forwarding device in the forked position, so as to be forwarded in the forked position.
  • the forwarding device that matches the device information establishes at least two pseudowires according to the primary and backup pseudowire information.
  • the method for establishing a pseudowire in the embodiment is applicable to the establishment of a pseudowire in the MS-PW system, and includes: a TPE connected to the user edge device, generating a label mapping message, where the forwarding device information in the bifurcation position, and the forwarding device After the at least two next hops or at least two outbound interfaces receive the label mapping message, the forwarding device at the branching position receives the label mapping message, and then forwards the information according to the information of the at least two next hops or at least two outbound interfaces.
  • the device establishes at least two pseudowires.
  • the TPE needs to send a label mapping packet to establish at least two pseudowires.
  • the TPE sends a label mapping packet to establish a pseudowire.
  • the pseudowire establishing method of the embodiment establishes a plurality of pseudowires between the forwarding device at the branching position and the destination node, so that the resources consumed by the pseudowire establishment can be reduced; and at least two forwarding devices are established at the branching position. After the pseudowires, one of them is the main pseudowire, so that when the forwarding device in the branching position determines that the main pseudowire fails, the active and standby pseudowires can be directly switched, and the TPE is required to send the switching signal in the prior art.
  • the process of simplifying the pseudowire protection switching can provide segment protection from the forwarding device in the forked position, and better utilize network resources.
  • a method for establishing a pseudowire the method in this embodiment can be applied to the MS-PW system shown in FIG. 1.
  • one forwarding device SPE2 and two different TPEs respectively Connect and configure the same Anycast address on the two different TPE3s and TPEs4. It can also be applied to the MS-PW system shown in Figure lb.
  • the forwarding device SPE2 can reach TPE2 through different outbound interfaces.
  • the flowchart of the method for establishing a pseudowire in this embodiment is as shown in FIG.
  • Step 301 During the process of extending the routing information, the pseudo-line entry information is formed on the forwarding device SPE2, where: the correspondence between the first destination address and the at least two next hop addresses, that is, the anycast address and at least two Corresponding relationship of the next hop addresses, or at least two different pseudo-line information of the device corresponding to the first destination address;
  • the routing entry information of the PW that is, the destination address and the next hop address (Next Hop) will be formed during the route diffusion process.
  • the PW route is advertised through the routing protocol, and the PW routing entry information is formed on the device; and the same anycast address is configured on the TPE3 and the TPE4, and the two devices perform routing information according to the same address, and pass through The routing entry information is formed on the forwarding device.
  • the forwarding device SPE2 in the bifurcation position forms a routing entry corresponding to at least two different next f mega addresses of the same destination address.
  • the routing entry information of the PW is formed in the route-distribution process, including the mapping between the destination address and the outbound interface of the device.
  • TPE1 sends a route extension message to The destination address is the address of the TPE1 to advertise the routing information, and the routing entry information is formed on the forwarding device.
  • the TPE2 sends the routing message with the TPE2 address as the destination address, and the SPE2 to TPE2 are at least two outbound interfaces.
  • the two pseudo lines distribute routing information by information, and form routing entry information on the passing forwarding device.
  • the forwarding device SPE2 in the forked position forms a routing entry with a destination address corresponding to at least two different pseudo-line information.
  • Step 302 The forwarding device SPE2 receives the pseudowire establishment signaling, and the pseudowire establishment signaling requests to establish a pseudowire to the device corresponding to the first destination address, according to at least two next hop addresses, or corresponding to the first destination address. At least two different routing information of the device, and at least two pseudowires are established from the local device, that is, the forwarding device.
  • the active and standby pseudowire information of at least two pseudowires can be obtained, and at least two pseudowires are established according to the information of the active and standby pseudowires, and when the information of the active and standby pseudowires is obtained, Local device preset policies and other methods are obtained.
  • the forwarding device SPE is connected to two TPEs. 55 and Ding? 6 is configured with the same anycast address 5.5.5.5, with The body establishes the pseudowire by the following method:
  • the routing information is flooded.
  • the pseudo-line entry information is formed on the device.
  • the TPE1 sends a route extension message to advertise the routing information with the destination address being 1 ⁇ 1.1.
  • the routing entry is formed on the SPE.
  • the node is 1.1.1.1
  • the next hop node is in the 1.1.1.1 relationship
  • the route extension message is sent according to the forwarding egress.
  • the TPE5 and TPE6 receive the label mapping packet, the entry is formed as follows:
  • the destination address is 1.1.1.1.
  • the jump node is the correspondence of 2.2.2.2.
  • the TPE5 and the TPE6 send the route extension message, and the destination node is 5.5.5.5 to advertise the routing information.
  • the SPE maps the packet according to the label, the entry is formed:
  • the next hop is 3.3.3.3 and 4.4 respectively.
  • Correspondence of .4.4; TPE1 forms the entry:
  • the next hop is the correspondence of 2.2.2.2 when the destination address is 5.5.5.5.
  • the TPE1 When a pseudowire is established from the TPE1 to the SPE, the TPE1 receives the pseudowire establishment signaling and requests to establish a pseudowire to the device corresponding to the destination address 5.5.5.5, according to the two of the routing entry information. The next hop address is used to establish two pseudowires from the SPE.
  • the active and standby conditions of the pseudowires can be set according to the preset configuration.
  • the SPE After the establishment of at least two pseudowires, when the SPE determines that the main pseudowire is faulty, it can directly switch the information to and from the interface between the TPE5 and the TPE6 to implement the switching between the active and standby pseudowires without the user edge.
  • the TPE connected between the devices sends handover signaling to perform handover, which simplifies the recovery process of the pseudowire.
  • the pseudowire establishment method in this embodiment is applicable to the establishment of the pseudowire of the MS-PW system, and includes: the forwarding device forms the pseudo-line entry information, including the correspondence between the first destination address and the at least two next hop addresses, or The first destination address corresponds to at least two different routing information of the device; when receiving the pseudowire establishment signaling, requesting to establish a pseudowire to the corresponding device of the first destination address, according to at least two next hop addresses, or to the first The destination address corresponds to at least two different routing information of the device, and at least two pseudowires are established from the local device.
  • the TPE device needs to send the switching signaling of the active and standby pseudowires to perform the handover.
  • a forwarding device the structure diagram is shown in Figure 7, including:
  • the message receiving unit 10 is configured to receive the label mapping message, where the label mapping message includes: forwarding device information at the forked position, and at least two next hops or at least two of the forwarding devices at the forked position Interface information;
  • the forwarding device in the branching position is a forwarding device that implements redundant protection of the pseudowire.
  • the forwarding device may be connected to two different TPE devices. Alternatively, the forwarding device may reach the same interface through different outbound interfaces. Next hop device.
  • the tag mapping message further includes explicit path information, which is used to perform explicit routing information release, and identifies primary and backup information for establishing at least two pseudowires.
  • the parsing unit 11 is configured to parse the label mapping packet received by the packet receiving unit 10, and obtain the forwarding device information at the bifurcation position and the information of at least two next hops or at least two outbound interfaces.
  • the specific TLV parsing unit is configured to parse the explicit path information in the label mapping message, such as the information of the additional type Sub-TLV in the TLV, to obtain the forwarding device information in the bifurcation position, and at least two of the forwarding devices. Information about the next hop or at least two outgoing interfaces.
  • the matching establishing unit 12 is configured to compare the forwarding device information in the branching position obtained by the parsing unit 11 with the local device information, and if they match, the forwarding device according to the information of the at least two next hops or at least two outbound interfaces Create at least two pseudowires.
  • the matching establishing unit 12 indicates that the forwarding device is the forwarding device in the forked position. And establishing at least two pseudowires from the forwarding device according to the information of the at least two next hops or the at least two outbound interfaces, specifically, establishing, between the forwarding device and the TPE device corresponding to each next hop address information.
  • a pseudowire, or a pseudowire is established on the forwarding device through the at least two outbound interfaces and the next hop TPE device; if the matching device does not match, the forwarding device is not in the bifurcation position, and the label mapping is reported.
  • the file is forwarded to the node device of the next hop to complete the establishment of the MS-PW segment.
  • one of the pseudowires may be set as a main pseudowire according to a preset strategy, and other pseudowires are set as pseudowires. In this way, after the pseudowire is established, when the forwarding device in the branching position determines that the main pseudowire fails, the fast protection switching of the pseudowire can be directly completed.
  • the forwarding device may further include an information acquiring unit 13 configured to acquire active/standby relationship information for establishing at least two pseudowires, and the matching establishing unit 12 is The pseudowire is established according to the master/slave relationship information acquired by the information acquiring unit 13.
  • the information obtaining unit 13 may be a parsing sub-unit, configured to parse the label mapping message received by the packet receiving unit 10 to obtain the active/standby relationship information of at least two pseudowires, or may be an advertisement receiving parsing subunit, Receiving the primary and backup pseudowire information advertisements sent by the TPE connected to the user edge device, and parsing the active and standby pseudowire information notifications to obtain.
  • the forwarding device may further include: a failover unit 14 configured to: when the primary pseudowire in the at least two pseudowires established by the matching establishing unit 12 fails, perform switching of the active and standby pseudowires.
  • a failover unit 14 configured to: when the primary pseudowire in the at least two pseudowires established by the matching establishing unit 12 fails, perform switching of the active and standby pseudowires.
  • the packet receiving unit 10 receives the label mapping message sent by the TPE that is directly connected to the user edge device, and the parsing unit 11 parses the forwarding device information in the bifurcation position, and at least the forwarding device The information of the two next hops or the at least two outgoing interfaces, if the forwarding device information in the branching position matches the local device information, the matching establishing unit 12 according to the information of at least two next hops or at least two outgoing interfaces At least two pseudowires are established from the forwarding device.
  • the TPE needs to send a label mapping packet to establish at least two pseudowires.
  • the TPE sends a label mapping packet to establish a pseudowire phase.
  • the forwarding device of the embodiment establishes multiple pseudowires from the local device to the destination node, which can reduce the resources consumed by the pseudowire establishment; and after the two forwarding devices are established by the forwarding device in the bifurcation position, After the establishment of multiple MS-PW segments, the identifiers of the active and standby MS-PW segments can be implemented.
  • the failover unit 14 determines that the primary pseudowire is faulty, the fast protection switching of the MS-PW can be implemented on the forwarding device. In this way, the process of fast recovery of the pseudowire can be speeded up, and the segment protection of the MS-PW can be provided from the forwarding device in the branching position to better utilize the network resources.
  • Equipment Embodiment 2
  • a service provider's terminating edge device TPE includes: a message generating unit 20, configured to generate a label mapping message, where the label mapping message includes: forwarding device information at a forked position And information of at least two next hops or at least two outbound interfaces of the forwarding device in the forked position;
  • the message generating unit 20 may add the additional information Sub-TLV in the explicit path information TLV in the label mapping message; and add the forwarding device information in the branching position in the additional type Sub-TLV. And at least two next hops or at least two outbound interfaces of the forwarding device Information.
  • the forwarding device that matches the forwarding device information in the branching position establishes at least two pseudowires from the forwarding device according to the information of the two next hops or at least two outbound interfaces.
  • the TPE may further include: an advertisement sending unit 22, configured to send the primary and backup pseudowire information to the forwarding device, so as to match the forwarding device information in the forked position.
  • the device also establishes at least two pseudowires according to the primary and backup pseudowire information.
  • the packet generating unit 20 generates a label mapping message, and the label mapping message includes forwarding device information at a forked position, and at least two of the forwarding devices.
  • the information of the next hop or at least two outgoing interfaces, and the packet sending unit 21 sends a label mapping message.
  • the forwarding device in the branching position establishes at least two pseudowires from the forwarding device according to the information of the at least two next hops or at least two outbound interfaces.
  • the TPE needs to send a label mapping message to establish at least two pseudo lines.
  • the TPE sends a label mapping message to establish a pseudo line, which can reduce the resources consumed by the pseudo line establishment. And after the at least two pseudowires are established in the branching device, one of them is a main pseudowire, so that when the main pseudowire fails, the active and standby pseudowires can be directly switched, and the prior art needs Compared with the TPE sending handover signaling to switch, the process of simplifying the pseudowire protection switching can provide segment protection from the forwarding device in the forked position, and better utilize network resources.
  • Equipment Embodiment 3 is Compared with the TPE sending handover signaling to switch, the process of simplifying the pseudowire protection switching can provide segment protection from the forwarding device in the forked position, and better utilize network resources.
  • a forwarding device including:
  • the correspondence relationship forming unit 30 is configured to form the pseudo-line by the entry information, where the pseudo-line entry information includes: a correspondence between the first destination address and the at least two next hop addresses, or at least the device corresponding to the first destination address Two different routing information;
  • the correspondence forming unit 30 is formed after receiving the route extension message in the process of spreading the routing information by the TPE device.
  • the pseudowire establishing unit 31 is configured to: when the pseudowire establishing signaling is received, the pseudowire establishing signaling request to establish a pseudowire to the first destination address corresponding device, and the first destination address formed by the corresponding relationship forming unit 30 corresponds to at least two The next f mega address, or at least two different routing information corresponding to the device corresponding to the first destination address, establishes at least two pseudowires from the local device.
  • the device in this embodiment may further include:
  • the master/slave information obtaining unit 32 is configured to acquire the active and standby pseudowire information of the at least two pseudowires.
  • the pseudowire establishing unit 31 is configured to establish at least two pseudos from the local device according to the active and standby pseudowire information obtained by the active/standby information obtaining unit 32. line.
  • the correspondence relationship forming unit 30 forms the pseudo-line entry information, including the correspondence between the first destination address and the at least two next hop addresses, or at least two of the first destination address corresponding devices.
  • Different routing information when the pseudowire establishing unit 31 receives the pseudowire establishing signaling, requesting to establish a pseudowire to the corresponding device of the first destination address, according to at least two next hop addresses, or to the device corresponding to the first destination address At least two different routing information, at least two pseudowires are established from the local device.
  • the TPE device sends the switching signaling of the active and standby pseudowires to perform the handover.
  • the forwarding device determines that the primary pseudowire is faulty, it directly performs the switching between the active and standby pseudowires. This simplifies the recovery process of the pseudowire and saves network resources.
  • a pseudowire establishing system includes a forwarding device 200 and a service provider's terminating edge device TPE 100, where:
  • the service provider's terminating edge device, the TPE 100 is configured to generate a label mapping message, where the label mapping message includes forwarding device information at the forked position, and at least two next hops of the forwarding device at the forked position or at least Sending the generated label mapping message to the forwarding device 200;
  • the forwarding device 200 is configured to receive the label mapping message, and parse the label mapping message to obtain the forwarding device information in the forked position, and the information of the at least two next hops or at least two outbound interfaces of the forwarding device in the forked position.
  • the forwarding device information in the branching position is compared with the local device information. If they match, at least two pseudowires are established from the forwarding device according to the information of the at least two next hops or at least two outbound interfaces.
  • the method for establishing a pseudowire is applicable to the establishment of a pseudowire in the MS-PW system, and the method includes: the forwarding device receives the label mapping packet sent by the TPE directly connected to the user edge device, and the parsing is obtained in the bifurcation position. Forwarding device information, and at least two next hops of the forwarding device The information is at least two outbound interfaces, and at least two pseudowires are established from the forwarding device according to information of at least two next hops or at least two outbound interfaces.
  • the TPE needs to send a label mapping packet to establish at least two pseudowires.
  • the TPE sends a label mapping packet to establish a pseudowire.
  • the pseudowire establishing method of this embodiment requires multiple pseudowires between the forwarding device and the destination node at the forked position, which can save network resources and provide efficient protection of the MS-PW; and forward at the forked position.
  • the device establishes two pseudo-wires, completes the establishment of multiple MS-PW segments, and implements the identification of the active and standby MS-PW segments.
  • the fast protection switching of the MS-PW can be implemented on the forwarding device. In this way, the process of fast recovery of the pseudowire can be speeded up, and the segment protection of the MS-PW can be provided from the forwarding device in the branching position to better utilize the network resources.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: Read only memory (ROM), random access memory (RAM), disk or optical disk, etc.

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Description

伪线建立方法、 系统及设备
本申请要求于 2010 年 1 月 15 日提交中国专利局、 申请号为 CN 201010001249.6, 发明名称为 "伪线建立方法、 系统及设备" 的中国专利申 请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域, 特别涉及伪线建立方法、 系统及设备。 背景技术
在实际的组网应用中, 大量采用单段伪线( Single-Segment Pseudo-Wire, SS-PW ) 构建的网络, 对业务汇聚设备造成很大压力。 端到端伪线仿真 ( Pseudo-Wire Emulation Edge to Edge, PWE3 )技术领域提出了多段伪线 ( Multi-Segment Pseudo-Wire , MS-PW )技术, 主要是通过转发边缘设备 ( Switching PE, S-PE, 后面简称转发设备) 来解决汇聚设备的压力和解决 网络部署跨域和安全问题。
参考图 la所示, 在采用 MS-PW构建的组网系统中, 在本端用户边缘设 备( CE1 )与对端 CE2通信时, 需要经过与本端 CE1直接连接的服务提供商 的终结边缘设备(Terminating Provider Edge, TPE1 ), 并建立经过 SPE1和 SPE2分别达到 TPE3和 TPE4的伪线连接, 而 PE (包括 TPE和 SPE )之间 伪线的建立, 通过如下步骤来实现:
1、 TPE1与 SPE1, SPE2 , TPE3之间建立会话连接; TPE1与 SPE1, SPE2 , TPE4之间建立会话连接;
2、 通过路由协议建立 PW路由;
3、 TPE1发送标签映射报文( label mapping ), 建立 TPE1到 TPE3的一 条多段伪线; TPE1发送标签映射报文, 建立 TPE1到 TPE4的另一条多段伪 线; 在建立的过程中可设定其中一条多段伪线为主伪线;
4、 当 TPE3或 TPE4接收到标签映射报文后, 完成到达 TPE1的反向伪 线建立。
通过上述的伪线建立后, 两个用户边缘设备之间建立通信时, 当 TPE发 现主伪线发生故障时, 会进行主备伪线的切换, 这样需要经过从本端 TPE到 对端 TPE才能完成主备伪线的切换,使得用户边缘设备之间的伪线保护切换 时间长。 发明内容
本发明实施例提供伪线建立方法、 系统及设备, 加快用户边缘设备之间 的伪线保护切换流程, 节省网络资源。
本发明实施例提供一种伪线建立方法, 包括:
接收标签映射报文, 所述标签映射报文中包括: 处于分叉位置的转发设 备信息, 和处于分叉位置的转发设备的至少两个下一跳或至少两个出接口的 信息;
解析所述标签映射报文得到所述处于分叉位置的转发设备信息, 和所述 至少两个下一跳或至少两个出接口的信息;
将本地设备信息与所述处于分叉位置的转发设备信息比较, 若相匹配, 根据所述至少两个下一跳或至少两个出接口的信息从所述转发设备建立至少 两条伪线。
本发明实施例提供一种伪线建立方法, 包括:
形成伪线路由表项信息, 所述伪线路由表项信息包括: 第一目的地址与 至少两个下一跳地址的对应关系, 或到所述第一目的地址对应设备的至少两 个不同的伪线路由信息;
当接收到伪线建立信令, 所述伪线建立信令请求建立到所述第一目的地 址对应设备的伪线, 根据所述至少两个下一跳地址, 或到所述第一目的地址 对应设备的至少两个不同的路由信息, 从本地设备建立至少两条伪线。
本发明实施例提供一种转发设备, 包括:
报文接收单元, 用于接收标签映射报文, 所述标签映射报文中包括: 处 于分叉位置的转发设备信息, 及处于分叉位置的转发设备的至少两个下一跳 或至少两个出接口的信息;
解析单元, 用于解析所述报文接收单元接收的标签映射报文得到所述处 于分叉位置的转发设备信息, 和至少两个下一跳或至少两个出接口的信息; 匹配建立单元, 用于将所述解析单元解析得到的处于分叉位置的转发设 备信息与本地设备信息比较, 若相匹配, 根据所述至少两个下一跳或至少两 个出接口的信息从所述转发设备建立至少两条伪线。
本发明实施例提供一种服务提供商的终结边缘设备 TPE, 包括: 报文生成单元, 用于生成标签映射报文, 所述标签映射报文中包括: 处 于分叉位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳 或至少两个出接口的信息; 设备, 以便与所述处于分叉位置的转发设备信息匹配的转发设备, 根据所述 两个下一跳或至少两个出接口的信息从所述转发设备建立至少两条伪线。
本发明实施例提供一种转发设备, 包括:
对应关系形成单元, 用于形成伪线路由表项信息, 所述伪线路由表项信 息包括: 第一目的地址与至少两个下一跳地址的对应关系, 或到所述第一目 的地址对应设备的至少两个不同的路由信息;
伪线建立单元, 用于当接收到伪线建立信令, 所述伪线建立信令请求建 立到所述第一目的地址对应设备的伪线, 根据所述对应关系形成单元形成的 第一目的地址对应至少两个下一跳地址, 或到所述第一目的地址对应设备的 至少两个不同的路由信息, 从本地设备建立至少两条伪线。
本发明实施例提供一种伪线建立系统, 包括转发设备和服务提供商的终 结边缘设备 TPE;
所述服务提供商的终结边缘设备 TPE, 用于生成标签映射报文,在标签映 射报文中包括处于分叉位置的转发设备信息, 和处于分叉位置的转发设备的 至少两个下一跳或至少两个出接口的信息; 发送生成的标签映射报文给转发 设备;
所述转发设备, 用于接收标签映射报文, 解析所述标签映射报文得到处 于分叉位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳 或至少两个出接口的信息; 将所述处于分叉位置的转发设备信息与本地设备 信息比较, 若相匹配, 根据所述至少两个下一跳或至少两个出接口的信息从 所述转发设备建立至少两条伪线。 本实施例伪线建立方法, 适用于 MS-PW系统的伪线建立, 包括: 转发设 备接收到与用户边缘设备直接连接的 TPE发送的标签映射报文,解析得到处于 分叉位置的转发设备信息, 及该转发设备的至少两个下一跳的信息或至少两 个出接口, 并根据所述至少两个下一跳或至少两个出接口的信息从该转发设 备建立至少两条伪线。 采用本发明实施例的方法建立至少两条伪线时, TPE 需要发送一个标签映射报文即可建立至少两条伪线,和现有技术中 TPE发送一 个标签映射报文建立一条伪线相比, 本实施例的伪线建立方法需要在分叉位 置的转发设备到目的节点之间的多条伪线, 这样能节省网络资源并提供 MS-PW的高效保护;
且在处于分叉位置的转发设备建立两条伪线, 完成多个 MS-P W分段的建 立, 并可实现 MS-PW分段的主备标识。 在确定主伪线分段发生故障时, 可以 在转发设备上实现 MS-PW的快速保护倒换。 这样加快伪线快速恢复的流程, 能从处于分叉位置的转发设备提供 MS-PW的段保护, 更好地利用网络资源。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面 描述中的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动性的前提下, 还可以根据这些附图获得其他的附图。
图 1 a是 MS-PW构建的组网系统的结构示意图;
图 lb是另一 MS-PW构建的组网系统的结构示意图;
图 2是本发明方法实施例一提供的伪线建立方法的流程图;
图 3是本发明方法实施例二提供的伪线建立方法的流程图;
图 4是本发明实施例中附加信息 Sub-TLV的示意图;
图 5是本发明方法实施例三提供的伪线建立方法的流程图;
图 6是本发明方法实施例提供的伪线建立方法适用的 MS-PW系统的结构 示意图;
图 7是本发明设备实施例一提供的转发设备的结构示意图;
图 8是本发明设备实施例一提供的另一转发设备的结构示意图; 图 9是本发明设备实施例二提供的 TPE的结构示意图;
图 10是本发明设备实施例二提供的另一 TPE的结构示意图;
图 11是本发明设备实施例三提供的转发设备的结构示意图;
图 12是本发明设备实施例三提供的另一转发设备的结构示意图; 图 13是本发明系统实施例提供的伪线建立系统的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 方法实施例一
一种伪线建立方法, 本实施例的方法可以适用于如图 1 a所示的 MS-PW系 统, 在 CE1与 CE2之间的多段伪线 MS-PW中, 有一个转发设备 SPE2分别与两 个不同的 TPE连接; 也可以适用于如图 lb所示的 MS-PW系统, 转发设备 SPE2 可以通过不同的出接口到达 TPE2。 本实施例的方法流程图如图 2所示, 包括: 步骤 101、 转发设备接收标签映射报文, 在标签映射报文中包括: 处于分 叉位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳或至 少两个出接口的信息;
这里处于分叉位置的转发设备是指实现伪线的冗余保护的转发设备, 该 转发设备可以是与两个不同的 TPE设备连接, 如图 la所示, 处于分叉位置的转 发设备为 SPE2, 分别与 TPE3和 TPE4连接; 也可以是该转发设备可以通过不同 的出接口到达同一个下一跳设备,如图 lb所示,处于分叉位置的转发设备 SPE2 通过出接口 1和 2与下一跳设备 TPE2连接。
可以理解, 在标签映射报文中还可以包括显式路径相关信息用于进行显 式路由信息发布, 如标识建立至少两条伪线的主备信息等。
步骤 102、 转发设备解析标签映射报文得到处于分叉位置的转发设备信 息, 和至少两个下一跳或至少两个出接口的信息;
可以理解, 在解析标签映射报文得到处于分叉位置的转发设备信息, 和 至少两个下一跳或至少两个出接口的信息时, 可以解析标签映射报文中显式 路径 ( explicit path )信息如类型、 长度及数值 ( Type Length Value, TLV ) 中 的附加信息(Sub-TLV )中的信息。 而转发设备信息可以是设备标识等, 下一 跳的信息可以是设备网络协议(IP )地址等信息。
步骤 103、 转发设备将处于分叉位置的转发设备信息与本地设备信息比 较, 若相匹配, 根据至少两个下一跳或至少两个出接口的信息从转发设备建 立至少两条伪线; 若不相匹配, 说明该转发设备并没有处于分叉位置, 则将 该标签映射报文转发给下一跳的节点设备, 完成 MS-PW分段的建立。
如果得到的处于分叉位置的转发设备信息与本地设备信息相匹配, 则说 明该转发设备即为处于分叉位置的转发设备, 对应图 1中的 SPE2。 在根据至少 两个下一跳或至少两个出接口的信息从该转发设备建立至少两条伪线, 具体 地,可以在该转发设备与每个下一跳地址信息对应的 TPE设备之间都建立一条 伪线,或在该转发设备通过至少两个出接口与下一跳的 TPE设备分别建立一条 伪线。
可以理解, 建立的伪线数量小于或等于下一跳的个数, 或者小于或等于 出接口的个数, 比如, 当有 4个下一跳的信息, 则可以建立 2或 3或 4条伪线。
在建立伪线的过程中, 可以根据预置的策略将其中一条伪线设置为主伪 线, 其它伪线设置为备伪线。 这样在建立伪线后, 当处于分叉位置的转发设 备确定主伪线发生故障时, 可以直接完成伪线的快速保护切换。
本实施例伪线建立方法, 适用于 MS-PW系统的伪线建立, 包括: 转发设 备接收到与用户边缘设备直接连接的 TPE发送的标签映射报文,解析得到处于 分叉位置的转发设备信息, 及该转发设备的至少两个下一跳或至少两个出接 口的信息, 并根据至少两个下一跳或至少两个出接口的信息从该转发设备建 立至少两条伪线。采用本发明实施例的方法建立至少两条伪线时, TPE需要发 送一个标签映射报文即可建立至少两条伪线,和现有技术中 TPE发送一个标签 映射报文建立一条伪线相比, 本实施例的伪线建立方法是在分叉位置的转发 设备到目的节点之间建立多条伪线, 这样能减少伪线建立所消耗的资源。 且 在处于分叉位置的转发设备建立两条伪线, 完成多个 MS-PW分段的建立, 可 实现主备 MS-PW分段的标识。 在确定主伪线发生故障时, 可以在转发设备上 实现 MS-PW的快速保护倒换。 这样加快伪线快速恢复的流程, 能从处于分叉 位置的转发设备提供 MS-PW的段保护, 更好地利用网络资源。
在本发明的一个具体实施例中, 转发设备在步骤 103中建立至少两条伪线 之前还可以获取这至少两条伪线的主备关系信息, 并根据主备关系信息建立 至少两条伪线。 具体地, 可以通过直接解析接收的标签映射报文中 Sub-TLV中 的信息来获取, 也可以通过接收用户边缘设备发送的主备伪线信息通告, 并 解析主备伪线信息通告中的主备伪线信息来获取, 还可以根据预置的策略来 获取等, 这并不构成对本发明实施例的限制。 方法实施例二
一种伪线建立方法, 本实施例的方法可以适用于如图 1 a所示的 MS-PW系 统, 在 CE1与 CE2之间的多段伪线 MS-PW中, 有一个转发设备 SPE2分别与两 个不同的 TPE连接; 也可以适用于如图 lb所示的 MS-PW系统, 转发设备 SPE2 可以通过不同的出接口到达 TPE2。 本实施例的方法流程图如图 3所示, 包括: 步骤 201、 TPE1生成标签映射报文, 在标签映射报文中包括处于分叉位置 的转发设备信息, 和处于分叉位置的转发设备的两个下一跳或至少两个出接 口的信息;
可以理解, TPE在进行显式路由的发布时,会配置源配置独立标识(source attachment individual identifier, SAII ),酉己置组标只 ( attachment group identifier, AGI )、 TAII信息以及到达与对端的用户边缘设备直接连接的 TPE的显式路径 信息。
处于分叉位置的转发设备是指实现伪线的冗余保护的转发设备, 在用户 边缘设备之间有至少两条多段伪线 MS-PW时, TPE将这至少两条多段伪线中 经过的设备进行比较, 获得处于分叉位置的转发设备信息, 在生成标签映射 报文时, TPE在标签映射报文中显式路径信息 TLV中增加附加信息( Sub-TLV ) 即子 TLV; 并在附加信息 Sub-TLV中携带处于分叉位置的转发设备信息, 和该 转发设备的至少两个下一跳或至少两个出接口的信息。 如图 4所示的为具体的 Sub-TLV的结构图, 其中 Value可以是 IPv4地址, 也可以是 IPv6地址。
步骤 202、 TPE发送生成的标签映射报文给转发设备, 以便与处于分叉位 置转发设备信息匹配的转发设备, 根据至少两个下一跳或至少两个出接口的 信息从转发设备建立至少两条伪线。
转发设备接收到生成的标签映射报文之后, 进行的伪线建立方法如方法 实施例一所述, 在此不再赘述。
可以理解, TPE还可以在标签映射报文中的 Sub-TLV中携带用户边缘设备 之间的多段伪线的主备关系信息, 这样处于分叉位置的转发设备接收到标签 映射报文后, 按照主备关系信息设置至少两条伪线。
在一个具体的实施例中, TPE还可以发送主备伪线信息通告给转发设备, 通知从处于分叉位置的转发设备建立的至少两条伪线的主备情况, 这样与处 于分叉位置转发设备信息匹配的转发设备, 是根据主备伪线信息通告建立至 少两条伪线。
本实施例伪线建立方法, 适用于 MS-PW系统的伪线建立, 包括: 与用户 边缘设备连接的 TPE, 生成标签映射报文, 其中包括处于分叉位置的转发设备 信息, 及该转发设备的至少两个下一跳或至少两个出接口的信息, 当处于分 叉位置的转发设备接收标签映射报文后, 则根据至少两个下一跳或至少两个 出接口的信息从该转发设备建立至少两条伪线。 采用本发明实施例的方法建 立至少两条伪线时, TPE需要发送一个标签映射报文即可建立至少两条伪线, 和现有技术中 TPE发送一个标签映射报文建立一条伪线相比,本实施例的伪线 建立方法在分叉位置的转发设备到目的节点之间建立多条伪线, 这样能减少 伪线建立所消耗的资源; 且在处于分叉位置的转发设备建立至少两条伪线后, 其中有一条是主伪线, 这样当处于分叉位置的转发设备确定主伪线发生故障 时, 可以直接进行主备伪线的切换, 和现有技术中需要 TPE发送切换信令进行 切换相比, 简化伪线保护切换的流程, 可以从处于分叉位置的转发设备提供 段保护, 更好地利用网络资源。 方法实施例三
一种伪线建立方法, 本实施例的方法可以适用于如图 1所示的 MS-PW系 统,在 CE1与 CE2之间的多段伪线中,有一个转发设备 SPE2分别与两个不同的 TPE连接,并在这两个不同的 TPE3和 TPE4上配置相同的任播( Anycast )地址; 也可以适用于如图 lb所示的 MS-PW系统, 转发设备 SPE2可以通过不同的出接 口到达 TPE2。 本实施例的伪线建立方法流程图如图 5所示, 包括: 步骤 301、 进行路由信息的扩展过程中, 在转发设备 SPE2上形成伪线路由 表项信息, 其中包括: 第一目的地址与至少两个下一跳地址的对应关系, 即 任播地址与至少两个下一跳地址的对应关系, 或到第一目的地址对应设备的 至少两个不同的伪线路由信息;
可以理解, 在如图 la的情况下, 如果 CE1与 CE2之间建立通信时, 在路由 扩散过程中会形成 PW的路由表项信息, 即目的地址( Destination )和下一跳 地址(Next Hop ) 的对应关系。 具体地, 通过路由协议完成 PW路由的发布, 并在设备上形成 PW路由表项信息; 而在 TPE3和 TPE4配置相同的任播地址, 两个设备按照相同地址进行路由信息发布, 并在经过的转发设备上形成路由 表项信息。
而对于处于分叉位置的转发设备 SPE2会形成同一个目的地址对应至少两 个不同的下一f兆地址的路由表项。
在如图 lb的情况下, 如果 CE1与 CE2之间建立通信时, 在路由扩散过程中 会形成 PW的路由表项信息, 包括目的地址与设备出接口的对应关系, TPE1 发送路由扩展消息, 以目的地址为 TPE1的地址进行路由信息发布, 并在经过 的转发设备上形成路由表项信息; 而 TPE2发送路由消息, 以 TPE2地址为目的 地址, 且从 SPE2到 TPE2为至少两个出接口这样至少两个伪线路由信息来发布 路由信息, 并在经过的转发设备上形成路由表项信息。
而处于分叉位置的转发设备 SPE2会形成一个目的地址对应至少两个不同 的伪线路由信息的路由表项。
步骤 302、转发设备 SPE2当接收到伪线建立信令, 该伪线建立信令请求建 立到第一目的地址对应设备的伪线, 根据至少两个下一跳地址, 或到第一目 的地址对应设备的至少两个不同的路由信息, 从本地设备即该转发设备建立 至少两条伪线。
可以理解, 在进行伪线建立前, 可以获取至少两条伪线的主备伪线信息, 根据主备伪线信息建立至少两条伪线, 而在获取主备伪线信息时, 可以是根 据本地设备预置的策略等方法获取。
以下一个具体的实施例进行说明, 结构示意图如图 6所示, 转发设备 SPE 与两个 TPE连接, 首先需要在 ?55和丁? 6上配置同一个任播地址5.5.5.5, 具 体通过如下方法实现伪线的建立过程:
1、 伪线建立的准备工作, 即路由信息的发布:
路由信息扩散: 在路由信息扩散过程中, 在设备上形成伪线路由表项信 息, TPE1发送路由扩展消息, 以目的地址为 1丄 1.1进行路由信息的发布; 在 SPE上形成路由表项: 目的节点为 1.1.1.1时下一跳节点为 1.1.1.1的对应关系, 并根据转发出口发送路由扩展消息; 当 TPE5和 TPE6接收到标签映射报文, 分 别形成表项: 目的地址为 1.1.1.1时下一跳节点为 2.2.2.2的对应关系。
TPE5和 TPE6发送路由扩展消息, 以目的节点为 5.5.5.5来发布路由信息; 当 SPE根据标签映射报文, 形成表项: 目的地址为 5.5.5.5时, 下一跳分别为 3.3.3.3和 4.4.4.4的对应关系; TPE1形成表项: 目的地址为 5.5.5.5时下一跳为 2.2.2.2的对应关系。
2、 伪线的建立:
从 TPE1到 SPE建立一条伪线; 从 SPE进行伪线建立时, 当 TPE1接收到伪 线建立信令,请求建立到目的地址 5.5.5.5对应设备的伪线, 则根据路由表项信 息中的两个下一跳地址, 从 SPE建立两条伪线, 在建立时, 可以根据预置的配 置进行设置伪线的主备情况。
在建立至少两条伪线后, 当 SPE确定主伪线发生故障时, 可以直接通过配 置与 TPE5和 TPE6之间接口对信息的收发, 来实现主备伪线的切换, 而不需要 与用户边缘设备之间连接的 TPE发送切换信令来进行切换,这样简化伪线的恢 复流程。
本实施例伪线建立方法, 适用于 MS-PW系统的伪线建立, 包括: 转发设 备形成伪线路由表项信息, 包括第一目的地址与至少两个下一跳地址的对应 关系, 或到第一目的地址对应设备的至少两个不同的路由信息; 当接收到伪 线建立信令, 请求建立到第一目的地址对应设备的伪线, 根据至少两个下一 跳地址, 或到第一目的地址对应设备的至少两个不同的路由信息, 从本地设 备建立至少两条伪线。和现有技术中需要 TPE设备发送主备伪线的切换信令来 进行切换相比, 采用本发明实施例的方法建立至少两条多跳伪线后, 其中有 一条是主伪线, 这样当该转发设备确定主伪线发生故障时, 直接进行主备伪 线的切换, 这样简化伪线的恢复流程, 也能节省网络资源。 设备实施例一
一种转发设备, 结构示意图如图 7所示, 包括:
报文接收单元 10, 用于接收标签映射报文, 标签映射报文中包括: 处于 分叉位置的转发设备信息, 及处于分叉位置的转发设备的至少两个下一跳或 至少两个出接口的信息;
这里处于分叉位置的转发设备是指实现伪线的冗余保护的转发设备, 可 以是该转发设备与两个不同的 TPE设备连接;也可以是该转发设备可以通过不 同的出接口到达同一个下一跳设备。 在标签映射报文中还包括显式路径信息 用于进行显式路由信息发布的信息, 标识建立至少两条伪线的主备信息等。
解析单元 11, 用于解析报文接收单元 10接收的标签映射报文, 得到处于 分叉位置的转发设备信息, 和至少两个下一跳或至少两个出接口的信息; 可以理解,解析单元 11具体可以是子 TLV解析单元,用于解析标签映射报 文中显式路径信息如 TLV中的附加类型 Sub-TLV的信息,得到处于分叉位置的 转发设备信息, 和该转发设备的至少两个下一跳或至少两个出接口的信息。
匹配建立单元 12, 用于将解析单元 11解析得到的处于分叉位置的转发设 备信息与本地设备信息比较, 若相匹配, 根据至少两个下一跳或至少两个出 接口的信息从转发设备建立至少两条伪线。
举例来说, 匹配建立单元 12如果得到的处于分叉位置的转发设备信息与 本地设备信息相匹配, 则说明该转发设备即为处于分叉位置的转发设备。 再 根据至少两个下一跳的信息或至少两个出接口从该转发设备建立至少两条伪 线, 具体地, 在该转发设备与每个下一跳地址信息对应的 TPE设备之间都建立 一条伪线,或在该转发设备通过至少两个出接口与下一跳的 TPE设备分别建立 一条伪线; 若不相匹配, 说明该转发设备并没有处于分叉位置, 则将该标签 映射报文转发给下一跳的节点设备, 完成 MS-PW分段的建立。
在建立伪线的过程中, 可以根据预置的策略将其中一条伪线设置为主伪 线, 其它伪线设置为备伪线。 这样在建立伪线后, 当处于分叉位置的转发设 备确定主伪线发生故障时, 可以直接完成伪线的快速保护切换。
参考图 8所示, 在一个具体的实施例中, 转发设备还可以包括信息获取单 元 13, 用于获取建立至少两条伪线的主备关系信息, 而匹配建立单元 12就是 根据信息获取单元 13获取的主备关系信息建立伪线的。
具体地, 信息获取单元 13可以是解析子单元, 用于解析报文接收单元 10 接收的标签映射报文得到至少两条伪线的主备关系信息, 也可以是通告接收 解析子单元, 用于接收与用户边缘设备连接的 TPE发送的主备伪线信息通告, 并解析主备伪线信息通告来获得。
在其它的具体实施例中, 转发设备还可以包括: 故障切换单元 14, 用于 确定匹配建立单元 12建立的至少两条伪线中的主伪线发生故障时, 进行主备 伪线的切换。
本实施例的转发设备中, 报文接收单元 10接收到与用户边缘设备直接连 接的 TPE发送的标签映射报文,解析单元 11解析得到处于分叉位置的转发设备 信息, 及该转发设备的至少两个下一跳或至少两个出接口的信息, 若处于分 叉位置的转发设备信息与本地设备信息相匹配, 由匹配建立单元 12根据至少 两个下一跳或至少两个出接口的信息从该转发设备建立至少两条伪线。 本发 明实施例的转发设备在建立至少两条伪线时, TPE需要发送一个标签映射报文 即可建立至少两条伪线,和现有技术中 TPE发送一个标签映射报文建立一条伪 线相比, 本实施例的转发设备建立从本地设备到目的节点之间的多条伪线, 这样能减少伪线建立所消耗的资源; 且在处于分叉位置的转发设备建立两条 伪线后, 完成多个 MS-PW分段的建立, 可实现主备 MS-PW分段的标识。 当故 障切换单元 14确定主伪线发生故障时, 可以在转发设备上实现 MS-PW的快速 保护倒换。 这样加快伪线快速恢复的流程, 能从处于分叉位置的转发设备提 供 MS-PW的段保护, 更好地利用网络资源。 设备实施例二
一种服务提供商的终结边缘设备 TPE, 结构示意图如图 9所示, 包括: 报文生成单元 20, 用于生成标签映射报文, 标签映射报文中包括: 处于 分叉位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳或 至少两个出接口的信息;
报文生成单元 20在生成标签映射报文时, 可以在标签映射报文中显式路 径信息 TLV中增加附加信息 Sub-TLV; 并在附加类型 Sub-TLV中添加处于分叉 位置的转发设备信息, 和该转发设备的至少两个下一跳或至少两个出接口的 信息。 以便与处于分叉位置的转发设备信息匹配的转发设备, 根据两个下一跳或至 少两个出接口的信息从转发设备建立至少两条伪线。
参考图 10所示, 在一个具体的实施例中, TPE还可以包括: 通告发送单元 22 , 用于发送主备伪线信息通告给转发设备, 以便与处于分叉位置的转发设 备信息匹配的转发设备, 还根据主备伪线信息通告建立至少两条伪线。
本实施例的服务提供商的终结边缘设备 TPE中,由报文生成单元 20生成标 签映射报文, 在标签映射报文中包括处于分叉位置的转发设备信息, 及该转 发设备的至少两个下一跳或至少两个出接口的信息, 并由报文发送单元 21进 行发送标签映射报文。 当处于分叉位置的转发设备接收标签映射报文后, 则 根据至少两个下一跳或至少两个出接口的信息从该转发设备建立至少两条伪 线。 本发明实施例中 TPE需要发送一个标签映射报文即可建立至少两条伪线, 和现有技术中 TPE发送一个标签映射报文建立一条伪线相比,能减少伪线建立 所消耗的资源; 且在处于分叉位置的转发设备建立至少两条伪线后, 其中有 一条是主伪线, 这样当主伪线发生故障时, 可以直接进行主备伪线的切换, 和现有技术中需要 TPE发送切换信令进行切换相比, 简化伪线保护切换的流 程, 可以从处于分叉位置的转发设备提供段保护, 更好地利用网络资源。 设备实施例三
一种转发设备, 结构示意图如图 11所示, 包括:
对应关系形成单元 30, 用于形成伪线路由表项信息, 伪线路由表项信息 包括: 第一目的地址与至少两个下一跳地址的对应关系, 或到第一目的地址 对应设备的至少两个不同的路由信息;
可以理解, 对应关系形成单元 30是在 TPE设备进行路由信息扩散的过程 中, 接收到路由扩展消息后形成的。
伪线建立单元 31, 用于当接收到伪线建立信令, 伪线建立信令请求建立 到第一目的地址对应设备的伪线, 根据对应关系形成单元 30形成的第一目的 地址对应至少两个下一f兆地址, 或到第一目的地址对应设备的至少两个不同 的路由信息, 从本地设备建立至少两条伪线。 参考如图 12所示, 在一个具体的实施例中, 本实施例中的设备还可以包 括:
主备信息获得单元 32, 用于获取至少两条伪线的主备伪线信息; 伪线建立单元 31是根据主备信息获得单元 32获得的主备伪线信息从本地 设备建立至少两条伪线。
本实施例的转发设备中, 对应关系形成单元 30形成伪线路由表项信息, 包括第一目的地址与至少两个下一跳地址的对应关系, 或到第一目的地址对 应设备的至少两个不同的路由信息, 当伪线建立单元 31接收到伪线建立信令, 请求建立到第一目的地址对应设备的伪线, 根据至少两个下一跳地址, 或到 第一目的地址对应设备的至少两个不同的路由信息, 从本地设备建立至少两 条伪线。 和现有技术中 TPE设备发送主备伪线的切换信令来进行切换相比, 采 用本发明实施例的方法建立至少两条多跳伪线后, 其中有一条是主伪线, 这 样当该转发设备确定主伪线发生故障时, 直接进行主备伪线的切换, 这样简 化伪线的恢复流程, 也能节省网络资源。 系统实施例
一种伪线建立系统, 结构示意图如图 13所示, 包括转发设备 200和服务提 供商的终结边缘设备 TPE 100, 其中:
服务提供商的终结边缘设备 TPE100, 用于生成标签映射报文, 在标签映 射报文中包括处于分叉位置的转发设备信息, 和处于分叉位置的转发设备的 至少两个下一跳或至少两个出接口的信息; 发送生成的标签映射报文给转发 设备 200;
转发设备 200, 用于接收标签映射报文, 解析标签映射报文得到处于分叉 位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳或至少 两个出接口的信息; 将处于分叉位置的转发设备信息与本地设备信息比较, 若相匹配, 根据至少两个下一跳或至少两个出接口的信息从转发设备建立至 少两条伪线。
可见, 本发明实施例的伪线建立方法, 适用于 MS-PW系统的伪线建立, 包括: 转发设备接收到与用户边缘设备直接连接的 TPE发送的标签映射报文, 解析得到处于分叉位置的转发设备信息, 及该转发设备的至少两个下一跳的 信息或至少两个出接口, 并根据至少两个下一跳或至少两个出接口的信息从 该转发设备建立至少两条伪线。 采用本发明实施例的方法建立至少两条伪线 时, TPE需要发送一个标签映射报文即可建立至少两条伪线, 和现有技术中 TPE发送一个标签映射报文建立一条伪线相比,本实施例的伪线建立方法需要 在分叉位置的转发设备到目的节点之间的多条伪线, 这样能节省网络资源并 提供 MS-PW的高效保护; 且在处于分叉位置的转发设备建立两条伪线, 完成 多个 MS-PW分段的建立, 并可实现主备 MS-PW分段的标识。 在确定主伪线分 段发生故障时, 可以在转发设备上实现 MS-PW的快速保护倒换。 这样加快伪 线快速恢复的流程, 能从处于分叉位置的转发设备提供 MS-PW的段保护, 更 好地利用网络资源。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成, 该程序可以存储于一计算机可 读存储介质中, 存储介质可以包括: 只读存储器 (ROM )、 随机存取存储器 ( RAM ), 磁盘或光盘等。
以上对本发明实施例所提供的伪线建立方法、 系统及设备, 进行了详细 实施例的说明只是用于帮助理解本发明的方法; 同时, 对于本领域的一般技 术人员, 依据本发明的思想, 在具体实施方式及应用范围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求 书
1、 一种伪线建立方法, 其特征在于, 包括:
接收标签映射报文, 所述标签映射报文中包括: 处于分叉位置的转发设 备信息, 和处于分叉位置的转发设备的至少两个下一跳或至少两个出接口的 信息;
解析所述标签映射报文得到所述处于分叉位置的转发设备信息, 和所述 至少两个下一跳或至少两个出接口的信息;
将本地设备信息与所述处于分叉位置的转发设备信息比较, 若相匹配, 根据所述至少两个下一跳或至少两个出接口的信息从所述转发设备建立至少 两条伪线。
2、 如权利要求 1所述的方法, 其特征在于, 所述根据所述至少两个下一 跳或至少两个出接口的信息从所述转发设备建立至少两条伪线之前还包括: 获取至少两条伪线的主备关系信息, 根据所述主备关系信息建立至少两 条伪线。
3、 如权利要求 2所述的方法, 其特征在于, 所述获取至少两条伪线的主 备关系信息具体包括:
解析所述标签映射报文得到至少两条伪线的主备关系信息; 或, 接收服务提供商的终结边缘设备 TPE发送的主备伪线信息通告,并解析所 述主备伪线信息通告。
4、 一种伪线建立方法, 其特征在于, 包括:
形成伪线路由表项信息, 所述伪线路由表项信息包括: 第一目的地址与 至少两个下一跳地址的对应关系, 或到所述第一目的地址对应设备的至少两 个不同的伪线路由信息;
当接收到伪线建立信令, 所述伪线建立信令请求建立到所述第一目的地 址对应设备的伪线, 根据所述至少两个下一跳地址, 或到所述第一目的地址 对应设备的至少两个不同的路由信息, 从本地设备建立至少两条伪线。
5、 如权利要求 4所述的方法, 其特征在于, 所述根据所述至少两个下一 跳地址, 从本地设备建立至少两条伪线之前还包括:
获取所述至少两条伪线的主备伪线信息, 并根据所述主备伪线信息从本 地设备建立至少两条伪线。
6、 一种转发设备, 其特征在于, 包括:
报文接收单元, 用于接收标签映射报文, 所述标签映射报文中包括: 处 于分叉位置的转发设备信息, 及处于分叉位置的转发设备的至少两个下一跳 或至少两个出接口的信息;
解析单元, 用于解析所述报文接收单元接收的标签映射报文得到所述处 于分叉位置的转发设备信息, 和至少两个下一跳或至少两个出接口的信息; 匹配建立单元, 用于将所述解析单元解析得到的处于分叉位置的转发设 备信息与本地设备信息比较, 若相匹配, 根据所述至少两个下一跳或至少两 个出接口的信息从所述转发设备建立至少两条伪线。
7、 如权利要求 6所述的设备, 其特征在于, 还包括:
信息获取单元, 用于获取所述至少两条伪线的主备关系信息;
则所述匹配建立单元是根据信息获取单元获取的主备关系信息建立伪线 的。
8、 一种服务提供商的终结边缘设备 TPE, 其特征在于, 包括:
报文生成单元, 用于生成标签映射报文, 所述标签映射报文中包括: 处 于分叉位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳 或至少两个出接口的信息; 设备, 以便与所述处于分叉位置的转发设备信息匹配的转发设备, 根据所述 两个下一跳或至少两个出接口的信息从所述转发设备建立至少两条伪线。
9、 如权利要求 8所述的设备, 其特征在于, 还包括:
通告发送单元, 用于发送主备伪线信息通告给转发设备, 以便与所述处 于分叉位置的转发设备信息匹配的转发设备, 还根据所述主备伪线信息通告 建立所述至少两条伪线。
10、 一种转发设备, 其特征在于, 包括:
对应关系形成单元, 用于形成伪线路由表项信息, 所述伪线路由表项信 息包括: 第一目的地址与至少两个下一跳地址的对应关系, 或到所述第一目 的地址对应设备的至少两个不同的路由信息; 伪线建立单元, 用于当接收到伪线建立信令, 所述伪线建立信令请求建 立到所述第一目的地址对应设备的伪线, 根据所述对应关系形成单元形成的 第一目的地址对应至少两个下一跳地址, 或到所述第一目的地址对应设备的 至少两个不同的路由信息, 从本地设备建立至少两条伪线。
11、 如权利要求 10所述的设备, 其特征在于, 还包括:
主备信息获得单元, 用于获取所述至少两条伪线的主备伪线信息; 所述伪线建立单元是根据所述主备信息获得单元获得的主备伪线信息从 本地设备建立至少两条伪线。
12、 一种伪线建立系统, 其特征在于, 包括转发设备和服务提供商的终 结边缘设备 TPE;
所述服务提供商的终结边缘设备 TPE, 用于生成标签映射报文,在标签映 射报文中包括处于分叉位置的转发设备信息, 和处于分叉位置的转发设备的 至少两个下一跳或至少两个出接口的信息; 发送生成的标签映射报文给转发 设备;
所述转发设备, 用于接收标签映射报文, 解析所述标签映射报文得到处 于分叉位置的转发设备信息, 和处于分叉位置的转发设备的至少两个下一跳 或至少两个出接口的信息; 将所述处于分叉位置的转发设备信息与本地设备 信息比较, 若相匹配, 根据所述至少两个下一跳或至少两个出接口的信息从 所述转发设备建立至少两条伪线。
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EP2963867B1 (en) 2018-09-26
CN102130813A (zh) 2011-07-20
JP2013529398A (ja) 2013-07-18
CN102130813B (zh) 2016-08-03
EP2963867A1 (en) 2016-01-06
US9912586B2 (en) 2018-03-06
US20120281702A1 (en) 2012-11-08
EP2525536B1 (en) 2015-07-15
EP2525536A4 (en) 2013-02-27
CN105704029B (zh) 2020-06-26
EP2525536A1 (en) 2012-11-21
US20160294690A1 (en) 2016-10-06

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