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WO2012159489A1 - Procédé de commutation, système et dispositif fournisseur de double anneau pour réseau à double anneau de pseudo-circuit - Google Patents

Procédé de commutation, système et dispositif fournisseur de double anneau pour réseau à double anneau de pseudo-circuit Download PDF

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Publication number
WO2012159489A1
WO2012159489A1 PCT/CN2012/072915 CN2012072915W WO2012159489A1 WO 2012159489 A1 WO2012159489 A1 WO 2012159489A1 CN 2012072915 W CN2012072915 W CN 2012072915W WO 2012159489 A1 WO2012159489 A1 WO 2012159489A1
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WO
WIPO (PCT)
Prior art keywords
dual
primary
pseudowire
link
traffic
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Ceased
Application number
PCT/CN2012/072915
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English (en)
Chinese (zh)
Inventor
杨学成
张利锋
厉霞明
叶勇
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ZTE Corp
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ZTE Corp
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Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements

Definitions

  • the present invention relates to the field of data network communication technologies, and in particular, to a Pseudo Wire (PW) dual-homing network switching method, system, and dual-homing carrier equipment.
  • PW Pseudo Wire
  • Layer 2 Virtual Private Network is a technology that relies on Internet service providers and network service providers to establish private data communication networks in public networks. It can be divided into two types: Virtual Private Lan Service (VPLS) and Virtual Leased Line (VLL). The former is based on Ethernet forwarding and supports point-to-multipoint network deployment. The latter is virtual. Dedicated line service, based on Ethernet, Asynchronous Transfer Mode (ATM), Time-Division Multiplexing (TDM), High-Levd Data Link Control (HDLC), Frame Relay ( Layer 2 service emulation, such as Frame Relay (FR) and Point to Point Protocol (PPP), only supports point-to-point network deployment.
  • ATM Asynchronous Transfer Mode
  • TDM Time-Division Multiplexing
  • HDLC High-Levd Data Link Control
  • FR Frame Relay
  • PPP Point to Point Protocol
  • PW operation management proposed by the IETF organization PWE3 working group Operation Administration & Maintenance (OAM) Message Mapping and PW redundancy technologies are considered for this purpose.
  • PW OAM Message Mapping ( draft-ietf-pwe3-oam-msg-map-12 ) is a pseudowire fault notification technology.
  • the fault mapping between the AC (access circuit) and the PW (pseudowire) is supported.
  • the association with the PW layer OAM is implemented, and the fault is advertised to the remote end through the PWE3 protocol packet. The remote end can quickly learn that the service path has failed and perform corresponding subsequent processing.
  • PW redundancy (draft-ietf-pwe3-redundancy-01) is a pseudowire redundancy protection technique.
  • network backup is considered to implement the path backup mechanism.
  • the working path and backup path relationship can be generated through protocol signaling negotiation or by user-specified designation.
  • the PW OAM message mapping technology and the PW redundancy technology are interrelated.
  • the former is mainly responsible for fault notification.
  • the latter is mainly responsible for responding to the fault information that is advertised, determining the current effective path, and guiding traffic forwarding. The two complement each other and jointly complete the fast convergence of the fault. .
  • a dual-homing protection switching method is used to perform Bidirectional Forwarding Detection (BFD) on the PW link and Ethernet OAM on the AC link.
  • BFD Bidirectional Forwarding Detection
  • the Ethernet OAM detects a fault
  • the fault is caused by the OAM through the oam mapping method. Passed to BFD to achieve end-to-end fault delivery and linkage. Thereby, the impact of network failure on the service is reduced, the probability of service unavailability is reduced, and the reliability of the service is improved.
  • CE User Edge
  • M-LAG Multi-Chassis-Link Aggregation Group
  • PE2 and PE3 form a primary backup path, where " --- ⁇ , represents the network traffic path before AC1 failure, and " ⁇ " represents AC 1 failure.
  • Post network process path The following problems exist in network switching:
  • the amount of switching of the entire network is MAX (TCE switching performance, TPEI switching performance); considering T fault detection and T switching behavior is; ⁇ two steps necessary for quantity switching, technology The same is true, but the TPE2 fault transmission is uncontrollable.
  • the existing fault transmission mostly adopts label distribution protocol (LDP) signaling, BFD or TP-OAM, etc.
  • LDP, BFD, TP-OAM is a series of extensions that increase the complexity of PE2 equipment.
  • fault-transmission packets need to span the PE2-PE1 network. When the network is large, the transmission delay becomes larger and the possibility of packet loss increases. This may cause the T PE2 failover to become the switching performance bottleneck of the entire network.
  • the embodiment of the invention provides a method for switching a pseudo-line dual-homing network, a system, and a dual-homing operator device, which can implement controllable and guaranteed network switching performance of TPE2 fault transmission in the switching technology of the PW dual-homing network.
  • An embodiment of the present invention provides a method for switching a pseudo-line dual-homed network, including: when a primary link fails, and a user equipment switches traffic to a standby link, the primary dual-homing carrier device in the primary link enables the middle.
  • the intermediate switching pseudowire is a pseudowire established between the primary dual-homing carrier device and a standby dual-homing carrier device in the standby link; the primary dual-homing carrier device switches traffic to The intermediate switching pseudowire is transmitted.
  • the switching method further includes:
  • the primary dual-homed carrier device switches back the traffic to the primary link for transmission.
  • the method further includes: the primary dual-homing operation, before the primary dual-homing carrier device in the primary link is configured to enable the intermediate switching pseudowire, when the primary link fails, and the user equipment switches the traffic to the standby link. Establishing a physical connection and the intermediate switching pseudowire between the merchant device and the standby dual-homed carrier device;
  • the primary dual-homed carrier device forms a protection relationship between the primary link and the intermediate switching pseudowire, and associates the primary pseudowire with the intermediate switching pseudowire.
  • the intermediate switching pseudowire is enabled; when the primary link fails to recover, and the user equipment delays the traffic back to the primary link, The intermediate switching pseudowire is not enabled.
  • the method also includes: and a status of the alternate link.
  • An embodiment of the present invention provides a dual-homing carrier device, including:
  • An enabling unit configured to enable an intermediate switching pseudowire when the primary link fails and the user equipment switches the traffic to the standby link, where the intermediate switching pseudowire is in the primary dual-homing carrier device and the standby link a pseudowire established between the alternate dual-homed carrier devices;
  • the dual-homed carrier device further includes:
  • a failback unit configured to: when the primary link fails to recover, and the user equipment delays the traffic back to the primary link, the traffic is switched back to the primary link for transmission.
  • the dual-homed carrier device further includes:
  • connection establishing unit configured to establish a physical connection and the intermediate switching pseudowire with the standby dual-homing carrier device
  • a setting unit configured to form a protection relationship between the primary link and the intermediate switching pseudowire, and associate a primary pseudowire with the intermediate switching pseudowire, and when the primary link fails, the user equipment switches the traffic
  • the intermediate switching pseudowire is enabled; when the primary link fails to recover, and the user equipment delays the traffic back to the primary link, the intermediate switching is reversed.
  • the line is not enabled.
  • the dual-homed carrier device further includes: a state of using the link.
  • An embodiment of the present invention provides a switching system for a pseudowire dual-homing network, including:
  • the user equipment is configured to switch the traffic to the standby link when the primary link fails, and the primary dual-homing carrier device in the primary link, when the user equipment switches the traffic to the standby link.
  • the traffic is switched to the intermediate switching pseudowire for transmission, and the intermediate switching pseudowire is a pseudowire established between the primary dual-homing operator equipment and the standby dual-homing carrier equipment in the standby link.
  • the user equipment is further configured to delay the traffic back to the primary link when the primary link fails to recover;
  • the primary dual-homing carrier device in the primary link is further configured to: when the user equipment delays the traffic back to the primary link, the traffic is switched back to the primary link for transmission.
  • the switching method of the pseudowire dual-homing network provided by the embodiment of the present invention adopts a new intermediate switching pseudo
  • the line improves the network switching performance, improves the switching performance, ensures the stability of the network, and provides customers with better services.
  • FIG. 1 is a schematic diagram of a scenario of a conventional PW dual-homing network
  • FIG. 2 is a flowchart of a method for switching a pseudowire dual-homing network according to an embodiment of the present invention
  • FIG. 3 is a module interaction diagram of PE2 according to an embodiment of the present invention.
  • FIG. 4 is a scenario top view of a PW dual-homing network according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a dual-homed carrier device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another dual-homing carrier device according to an embodiment of the present invention. detailed description
  • an embodiment of the present invention provides a method for switching a pseudowire dual-homing network, including:
  • the primary link (AC1) fails and the user equipment (CE) switches traffic to the standby link (AC2)
  • the primary dual-homed carrier device (PE2) in the primary link (AC1) enables intermediate switching pseudo Line (I-PW), the I-PW is a pseudowire established between PE2 and the alternate dual-homed carrier equipment (PE3) in AC2;
  • PE2 switches the traffic to the I-PW for transmission.
  • the traffic is forwarded on the path formed by the primary pseudowire (PW1) + I-PW+AC2, and the traffic is switched when the primary link fails.
  • TPE2 switching performance TPE2 fault detection + TPE2 switching behavior. Since traffic depends on path selection on both sides, the traffic switching performance of the entire network is MAX (TCE handover performance, T PE2 handover performance), which reduces the uncertainty of T PE2 failure transmission and improves network handover performance.
  • the foregoing switching method may further include the following steps:
  • PE2 establishes a protection relationship between the AC1 and the I-PW, and associates the PW1 with the I-PW.
  • the I-PW is enabled.
  • the CE delays the traffic.
  • the I-PW is disabled.
  • the status of AC1 and AC2 is obtained through negotiation between PE2 and CE.
  • the existing switchback technology mostly adopts the WTR delay switchback mode (that is, the AC1 does not immediately switch back when it recovers, but waits for a period of time to switch back again, mainly to prevent the AC1 state oscillation from affecting the traffic switching oscillation). In the network, both PE1 and CE adopt this mode.
  • both CE and PE2 can be aware.
  • the CE performs the WTR delay and waits for the switchback.
  • PE2 needs to transfer the "AC1 recovery" to PE1, PE1.
  • the WTR delay is also waited for the switchback.
  • CE and PE1 each perform WTR delay processing (WTR values are separately configurable, delay timers are maintained separately), and there is no interaction mechanism between them. Eventually, the timing of the two switches is inconsistent, and the time difference is the switchback. Performance, can produce a lot of unbearable packet loss.
  • the foregoing switching method may further include the following steps: When the AC1 fails to recover and the CE delays the traffic back to AC1, PE1 switches back the traffic to AC1 for transmission.
  • Switchback performance analysis When the AC1 link is faulty, both CE and PE2 can detect the traffic immediately. However, PE2 and CE do not process the traffic switchback at this time. There is no packet loss at this time.
  • the switching method of the pseudowire dual-homing network improves the network switching performance, improves the back-cut performance, ensures the stability of the network, and provides a more perfect solution for the customer by adding an intermediate switching pseudowire. service. And the method is completely based on the existing hardware implementation of the device, and only needs to provide technical support at the software control level, which is easy to implement.
  • the PE2 is provided with: a service management module, an I-PW protection group module, and an MC-LAG module;
  • the service management module is mainly responsible for the association between the AC information and the PW information; at the level of the control plane, serving the forwarding plane; further comprising: a PW forwarding table module and an AC forwarding table module;
  • the receiving processing logic of the PW side data packet is mainly implemented, that is, the PE device receives the data packet from the PW side, performs routing according to the PW forwarding table, and forwards the packet; the level belongs to the forwarding plane;
  • AC forwarding table module It mainly implements the receiving processing logic of the AC side data packet, that is, the PE device receives the data packet from the AC side, performs routing according to the AC forwarding table, and forwards it; the level belongs to the forwarding plane.
  • I-PW protection group module Maintains the protection relationship between the AC and the I-PW.
  • the AC defaults to the primary path.
  • I-PW defaults to the alternate path; the preferred path is determined according to the state of the AC and I-PW; the control plane is hierarchically;
  • MC-LAG module Mainly maintains the active/standby state of the AC.
  • the AC state on the PE is controlled by the MC-LAG module of the CE device and is notified by protocol packets.
  • this embodiment implements fast switching of the PW dual-homing network, where "-- ⁇ " represents the AC1 pre-failure network traffic path, and " ⁇ " represents the AC1 post-fault network flow path.
  • This embodiment includes the following steps. :
  • Step A Perform the deployment of the common PW dual-homing network.
  • Step A specifically includes:
  • VLL Virtual Leased Line
  • A2 a VLL service is established between PE1 and PE3, and PW2 is formed.
  • A3 and PE1 form a PW dual-protection group relationship between PW1 and PW2, PW1 is the primary and PW2 is the standby.
  • A4, PE2, PE3, and CE are deployed in the MC-LAG dual-homed network.
  • the AC1 and AC2 are in the protection group relationship.
  • AC1 is the primary and AC2 is the standby.
  • step A After step A is completed, the normal PW dual-homing network deployment is completed.
  • the "Service Management Module” on PE2 maintains the "AC Forwarding Table Module” and "PW Forwarding Table Module” according to the VLL service configuration.
  • the "AC forwarding table module” forms an AC forwarding table (see Table 1)
  • the "PW forwarding table module” forms a PW forwarding table (see Table 2).
  • the traffic of PE1-CE is based on Table 1 and Table 2. Select “PE1-PE2-CE” as the forwarding path and the traffic can communicate with each other.
  • Step B On the basis of the common PW dual-homing network, the I-PW function is added.
  • Step B specifically includes:
  • B2, PE2 and PE3 are connected to each other to establish an outer tunnel
  • I-PW VLL service
  • step B After step B is completed, the deployment of the new PW dual-homing network is completed.
  • I-PW protection group module forms a protection relationship between AC1 and I-PW.
  • AC1 is active and I-PW is standby;
  • AC forwarding table module and “PW forwarding table module” are protected by “I-PW”.
  • the group module is affected, there is an update of forwarding information, see Table 3, Table 4. According to the active entries in Table 3 and Table 4, PE1 and PE2-CE are used as the forwarding path. The traffic can communicate with each other.
  • the MC-LAG module immediately exchanges protocol packets with the CE.
  • the MC-LAG protocol negotiates that AC1 is standby and AC2 is active.
  • the MC-LAG module notifies I-
  • the PW protection group module updates the active/standby status to AC1 as standby and I-PW as Active;
  • Step D The "I-PW protection group module” notifies the updated service status to the "service management module", and the “service management module” refreshes the forwarding table, and finally the "AC forwarding table module” and the “PW forwarding table” The information of the module is updated. See Table 5 and Table 6.
  • the traffic of PE1-CE is based on the active entry in Table 6.
  • PE1-PE2-PE3-CE is the forwarding path, and the traffic can communicate with each other.
  • the CE uses the WTR delay switchback policy.
  • the MC-LAG module interacts with the CE.
  • the MC-LAG protocol still negotiates that AC1 is standby and AC2 is active.
  • the status of the forwarding table has not changed.
  • the status of the corresponding forwarding table remains unchanged.
  • the traffic is still selected as the forwarding path.
  • the traffic can communicate with each other.
  • Step F After the WTR of the CE device times out, the MC-LAG protocol renegotiates AC1 as Active, AC2 is standby; notify the "MC-LAG module" of PE2 by protocol packet; Step G, "MC-LAG module” responds to the negotiation result, and informs the "I-PW protection group module” to update the active/standby status to AC1 is active and I-PW is standby;
  • Step H The "I-PW protection group module” notifies the updated service status to the "service management module", and the “service management module” refreshes the forwarding table, and finally the "AC forwarding table module” and the “PW forwarding table” The information of the module is updated. See Table 7 and Table 8.
  • the traffic of PE1-CE is based on the active entry in Table 8.
  • PE1-PE2 -CE is the forwarding path, and the traffic can communicate with each other.
  • an embodiment of the present invention further provides a dual-homing carrier device, including: an enabling unit, configured to enable intermediate switching pseudo when a primary link fails and a user equipment switches traffic to a standby link.
  • the line, the intermediate switching pseudowire is a pseudowire established between the dual-homing operator equipment and the standby dual-homing carrier equipment in the standby link;
  • the switching unit is configured to switch the traffic to the intermediate switching pseudowire for transmission.
  • the dual-homed carrier device may further include:
  • the switchback unit is configured to perform traffic back to the primary link for transmission when the primary link fails to recover and the user equipment delays the traffic back to the primary link.
  • the dual-homed carrier device may further include:
  • connection establishing unit configured to establish a physical connection and an intermediate switching pseudowire with the standby dual-homed carrier device
  • the setting unit is configured to form a protection relationship between the primary link and the intermediate switching pseudowire, and associate the primary pseudowire with the intermediate switching pseudowire.
  • the intermediate switching is performed.
  • the pseudowire is enabled.
  • the intermediate switching pseudowire is disabled.
  • the dual-homed carrier device may further include:
  • the state obtaining unit is configured to obtain a state of the primary link and the standby link by negotiating with the client device.
  • the dual-homed carrier device not only improves the network switching performance, but also further improves the back-cut performance, ensures the stability of the network, and provides a more perfect service to the client.
  • the embodiment of the present invention further provides a switching system for a pseudowire dual-homing network, including: a client device, configured to switch traffic to a standby link when the primary link fails;
  • the home carrier device is configured to switch the traffic to the intermediate switching pseudowire for transmission when the user equipment switches the traffic to the standby link, and the intermediate switching pseudowire is the standby dual in the dual-homed carrier device and the standby link.
  • the user equipment can also be used to delay the traffic back to the primary link when the primary link fails.
  • the primary dual-homed carrier device in the primary link can also be used to switch traffic back to the primary link for transmission when the user equipment delays the traffic back to the primary link.
  • the switching system of the pseudowire dual-homing network provided by the embodiment of the invention not only improves the network switching performance, but also further improves the switching performance, ensures the stability of the network, and provides a better service to the customer.
  • the above storage medium may be a ROM/RAM, a magnetic disk, an optical disk or the like.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention porte sur un procédé de commutation, un système et un dispositif fournisseur de double anneau pour un réseau à double anneau de pseudo-circuit, le procédé de commutation comprenant les opérations suivantes : lorsqu'une défaillance se produit sur une liaison primaire et un terminal utilisateur commute le trafic vers une liaison de secours, un dispositif fournisseur de double anneau primaire de la liaison primaire instaure un pseudo-circuit de commutation intermédiaire, ledit pseudo-circuit de commutation intermédiaire étant le pseudo-circuit établi entre le dispositif fournisseur de double anneau primaire et un dispositif fournisseur de double anneau de secours de la liaison de secours ; le dispositif fournisseur de double anneau primaire commute le trafic vers le pseudo-circuit de commutation intermédiaire pour sa transmission. Au moyen de l'ajout d'un pseudo-circuit de commutation intermédiaire, la présente invention améliore les performances de commutation de réseau, améliore les performances de commutation en retour, assure la stabilité du réseau et offre un service amélioré pour le client.
PCT/CN2012/072915 2011-05-25 2012-03-23 Procédé de commutation, système et dispositif fournisseur de double anneau pour réseau à double anneau de pseudo-circuit Ceased WO2012159489A1 (fr)

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CN201110137249.3 2011-05-25
CN201110137249.3A CN102325037B (zh) 2011-05-25 2011-05-25 一种伪线双归网络的切换方法、系统和双归属运营商设备

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CN101753464A (zh) * 2010-01-22 2010-06-23 中兴通讯股份有限公司 路由收敛方法、运营商边缘设备及虚拟专用网系统
CN102325037A (zh) * 2011-05-25 2012-01-18 中兴通讯股份有限公司 一种伪线双归网络的切换方法、系统和双归属运营商设备

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