WO2008119277A1

WO2008119277A1 - A method and device for implementing mpls te on vlan interface

Info

Publication number: WO2008119277A1
Application number: PCT/CN2008/070378
Authority: WO
Inventors: Yu Fan; Jun Liu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-03-31
Filing date: 2008-02-29
Publication date: 2008-10-09
Also published as: CN101030917B; CN101030917A

Abstract

A method and device for implementing MPLS TE on VLAN interface, comprises: determining a current assignable bandwidth value of a physical interface; based on the current assignable bandwidth value distributing practicable bandwidth for MPLS TE tunnel which corresponding to VLAN interface on the physical interface. The current assignable bandwidth value is determined according to the assigned bandwidth value and the total assignable bandwidth value.

Description

Method and device for implementing MPLS TE on VLAN interface

This application claims priority to Chinese Patent Application No. 200710096217.7, entitled "A Method and Apparatus for Implementing MPLS TE on a VLAN Interface", filed on March 31, 2007, the entire disclosure of which is incorporated by reference. The citations are incorporated herein by reference.

Technical field

The present invention relates to the field of network communication technologies, and in particular, to a method and an apparatus for implementing MPLS TE on a VLAN interface.

Background technique

With the rapid development and widespread application of Ethernet technology, the cost of deploying Ethernet networks is becoming more and more rampant. At the same time, it faces IP-based services such as Triple-Play (three networks in one) and IPTV (Internet Protocol Television). New services such as Internet Protocol (Network Protocol) technology continue to emerge. Traditional SDH/SONET (Synchronous Digital Hierarchy/Synchronous Optical Network) networks are no longer the most suitable and economical. Network platform. Due to the high bandwidth and low cost of Ethernet technology, telecom operators are increasingly considering Ethernet technology when building access networks, metropolitan area networks, and even WANs. Carrier Ethernet (telecom-class Ethernet) has emerged. network) .

Carrier Ethernet needs to address the shortcomings and shortcomings of traditional Ethernet technology in Ethernet-based technologies, such as Ethernet broadcast storms, user-oriented connectivity, and end-to-end QoS (Quality of Service, Quality of service guarantees, slow business recovery after network failure, etc.

As a mature link layer network technology, VLAN (Virtual Local Area Network) technology can effectively solve the problem of Ethernet broadcast storm. Addressing the connection-free problem for users, that is, providing connection-oriented technologies including: MPLS Over Ethernet (multi-protocol label switching over Ethernet), PBT (Provider Backbone Transport) Etc.; MPLS (multi-protocol label switching over Ethernet) technology is widely used to transmit customer traffic as a mature label tunneling technology.

MPLS TE (multi-protocol label switching traffic engineering) can solve the problem that the traditional Ethernet technology cannot provide end-to-end QoS guarantee and slow service recovery after network faults. Solve the problem of slow business recovery after network failure, that is, it needs to be guaranteed Rapid recovery of user services (that is, if the user does not perceive the failure of the carrier backbone network in the process of using various IP-based services provided by the operator), the operator must ensure that the operation is between any network device or device in the network. In the event that the connection fails, the user data service of the adjacent node can be switched to other devices in the network as soon as possible to continue the transmission, and the service switching time must be less than 50 ms.

MPLS TE technology is an extension of MPLS technology. MPLS technology cannot provide QoS guarantee, and MPLS TE technology overcomes this shortcoming. When a user requests to establish a tunnel, the MPLS TE advertises the bandwidth parameters requested by the user to each device that the tunnel will pass through the RSVP (Resource Reservation Protocol). The parameters are received. The network devices must allocate bandwidth on their respective interfaces according to the bandwidth parameters requested by the user, that is, bandwidth reservation. Only when all the devices passing through the tunnel meet the bandwidth request of the user, a complete tunnel is successfully established. If RSVP discovers that a certain device that the tunnel will pass cannot meet the bandwidth requirement during the bandwidth reservation release process, it will automatically re-initiate the tunnel establishment request to the new device until all devices meet the bandwidth requirements. Therefore, tunnels set up by MPLS can provide end-to-end QoS guarantees.

At the same time, MPLS TE technology also provides FRR (Fast Reroute) technology to ensure fast service switching, and it is clear that the time for fault protection switching is less than 50ms.

Since VLAN is a link layer network technology, and MPLS TE is a technology that relies on the IP network layer, the two are in the case of jointly constructing carrier-class Ethernet, VLAN interface (a VLAN-based IP) The logical interface of the attribute provides an interface form that can connect to the VLAN and MPLS TE. As a VLAN-based logical interface with IP attributes, the VLAN interface can not only complete the link layer forwarding inside the VLAN, but also participate in the network layer forwarding because it has IP attributes.

At present, the MPLS TE tunnel is directly established on the VLAN interface. However, if the MPLS TE tunnel is directly configured, the VLAN interface of the MPLS TE tunnel is used. Bandwidth values can be allocated to allocate bandwidth. As a VLAN-based IP network layer logical interface, a VLAN interface does not directly have many attributes of the actual physical interface, such as bandwidth parameters and interface status. Thus, in the case of using the assignable bandwidth value of the VLAN interface to allocate bandwidth, there are the following drawbacks: due to the direct physical connection between the two devices An interface can carry multiple VLANs and VLAN interfaces at the same time. On the physical interface, multiple MPLS TE tunnels with different next hops can be built at the same time. Also, if bandwidth is allocated based only on the physical interface, bandwidth requests between different VLANs cannot be distinguished. For example: Assume that two VLANs and corresponding VLAN interfaces are set on a physical interface of 1000M bandwidth, and two MPLS TE tunnels are set on the VLAN interface. One application has a bandwidth of 300M, and the other application bandwidth is 700M. If the bandwidth of the existing VLAN interface is used to allocate bandwidth, the 1000M bandwidth reserved on the physical interface is shared by the two tunnels; this causes the following problems: When the actual traffic on the tunnel applying for 300M bandwidth exceeds When the reserved 300M, it will preempt the bandwidth resources reserved by another tunnel. Therefore, QoS guarantee cannot be provided, that is, the MPLS TE tunnel cannot provide bandwidth guarantee.

The inventors of the present invention have found that the existing technical solutions can establish MPLS on a VLAN interface.

TE, but the MPLS TE on the VLAN interface cannot be implemented. That is, the bandwidth allocation of the MPLS TE tunnel cannot be guaranteed.

Therefore, there is currently no technical solution to establish a bandwidth-based MPLS TE tunnel on a VLAN interface.

Summary of the invention

The embodiment of the invention provides a method and a device for implementing MPLS TE on a VLAN interface, and can establish an MPLS TE tunnel based on bandwidth guarantee.

The embodiments of the present invention are implemented by the following technical solutions:

The embodiment of the invention provides a method for implementing MPLS TE on a VLAN interface, where the method includes:

Determining the current assignable bandwidth value of the physical interface;

The available bandwidth is allocated for the multi-protocol label switched traffic engineering MPLS TE tunnel corresponding to the virtual local area network VLAN interface on the physical interface according to the current assignable bandwidth value.

An embodiment of the present invention provides an apparatus for implementing MPLS TE on a VLAN interface, where the apparatus includes:

An assignable bandwidth value determining unit, configured to determine a current assignable bandwidth value of the physical interface, where the current assignable bandwidth value is determined according to an allocated bandwidth value of the physical interface and a total allocatable bandwidth value of the physical interface;

An available bandwidth allocation unit, configured to determine, according to the currently assignable bandwidth value, the physical The MPLS TE tunnel corresponding to the VLAN interface on the interface allocates available bandwidth.

It can be seen from the technical solutions provided by the foregoing embodiments of the present invention that the method and device for implementing MPLS TE on a VLAN interface are adopted in the carrier-class Ethernet, and the VLAN-based interface is adopted. The bandwidth of the MPLS TE tunnel is guaranteed to ensure the reasonable allocation of bandwidth resources on the MPLS TE tunnel.

DRAWINGS

1 is a structural diagram of directly establishing an MPLS TE tunnel on a VLAN interface according to an embodiment of the present invention;

2 is a structural diagram of a system according to an embodiment of the present invention.

detailed description

The technical solution of the embodiment of the present invention includes: determining a current assignable bandwidth value of the physical interface; and allocating an available bandwidth to the MPLS TE tunnel corresponding to the VLAN interface on the physical interface according to the determined current assignable bandwidth value.

The current assignable bandwidth value may be determined based on the allocated bandwidth value of the physical interface and the total assignable bandwidth value of the physical interface; the allocated bandwidth value of the physical interface may include: the allocated bandwidth value of the VLAN interface on the physical interface ; and/or, other bandwidth values that have been assigned on this physical interface.

The physical interface of the embodiment of the present invention is to establish a physical interface of the MPLS TE tunnel, and the MPLS TE tunnel can be directly established on the VLAN interface, which may include the following steps: First, according to a predetermined rule, the physical between the devices in the network An interface carries multiple VLANs at the same time and establishes a VLAN interface corresponding to the VLAN. After that, an MPLS TE tunnel is established from one device in the network to another. Devices in the network can include: Routers or Layer 3 switches.

The specific implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The embodiment of the present invention is implemented in the network structure diagram shown in FIG. 1. FIG. 1 is a network structure diagram of an embodiment of the present invention, including: PI (Provider, Intermediate Router), P2, PE (Provider Edge, Edge Router) A, PE B, and the established MPLS TE tunnel I, MPLS TE tunnel II, and FRR backup tunnel for MPLS TE tunnel II. The path of the MPLS TE tunnel I is PE A— PI—P2—the path of the PE channel II is PE A—PI—P2—PE C, where the MPLS TE tunnel II is on the IP network layer of the PI. The interface is VLAN interface 2; the path of the FRR backup tunnel is P1—P3—P2.

The method for establishing the MPLS TE tunnel I, the MPLS TE tunnel II, and the FRR backup tunnel may include: First, simultaneously carrying two VLANs, such as VLAN 1 and VLAN 2, on the physical interface between the directly connected P1 and P2 devices; Configure the corresponding VLAN interface 1 and VLAN interface 2 based on VLAN 1 and VLAN 2, and configure their respective IP addresses. Assume that the bandwidth of the physical interface on P1 is 1000 M.

Then, an MPLS TE tunnel is established. Including: establishing an MPLS TE tunnel I from the PE A device to the PE B device, the path is PE A - P1 - P2 - PE B, wherein the outbound interface of the IP network layer of the MPLS TE tunnel I on the P1 is the VLAN interface 1; The MPLS TE tunnel II of the PE A device to the PE C device is the PE A-PI-P2-PE C. The outgoing interface of the IP network layer on the MPLS TE tunnel II is VLAN interface 2.

In the embodiment of the present invention, the bandwidth allocation is performed on the physical interface of the MPLS TE tunnel, which includes the following steps:

Step 11: In the embodiment of the present invention, the interface that is configured to construct the MPLS TE tunnel is a logical interface based on the VLAN, and obtains physical interface information of the VLAN, a current assignable bandwidth value of the physical interface, and a bearer on the physical interface. The number of VLANs, for example, may be performed by an RSVP unit in the network; the current assignable bandwidth value of the physical interface may be determined according to the allocated bandwidth value of the physical interface and the total assignable bandwidth value; the allocated bandwidth of the physical interface The value may be determined based on the allocated bandwidth value of the VLAN interface on the physical interface and/or other bandwidth values allocated on the physical interface;

Step 12: Perform a constrained route calculation of the reserved bandwidth according to the current assignable bandwidth value obtained in step 11, and allocate a bandwidth according to the calculation result; for example, the current assignable bandwidth value obtained in step 11 may be specifically transmitted by the RSVP unit to the CSPF. (Constraint Shortest Path First) unit; the CSPF unit participates in the constrained route calculation of the current allocateable bandwidth value on the physical interface, and transmits the calculation result to the RSVP unit, according to the received RSVP unit. The calculation result allocates available bandwidth to the MPLS TE tunnel corresponding to the VLAN interface.

Step 13: Update the current available bandwidth value of the physical interface according to the allocated bandwidth value of this time and save it.

For example: According to the network structure shown in Figure 1, the available bandwidth of tunnel I is 300M; The maximum available bandwidth of the physical interface is still 1000M. However, the tunnel II can only apply for bandwidth resources from the remaining 700M. Moreover, the data traffic forwarded between the tunnel I and the tunnel does not preempt each other's bandwidth resources. That is, the method according to the embodiment of the present invention can guarantee the bandwidth guarantee of the MPLS TE tunnel.

The existing technical solutions have the following disadvantages in the case of providing MPLS TE FRR (MPLS Traffic Engineering Fast Reroute), which is based on multi-protocol label switching for traffic engineering: In a traditional network environment, one physical interface only A Layer 3 interface that can carry a pair of IP addresses at the same time. Therefore, when a fault occurs between the IP addresses, all traffic on the physical interface is interrupted. However, in a VLAN interface network, one physical interface can carry multiple interfaces. A VLAN interface is a Layer 3 interface with multiple pairs of IP addresses. When a VLAN interface is unavailable, the remaining VLAN interfaces on the physical interface are unavailable. For example, it is assumed that two VLANs and corresponding VLAN interfaces are configured on one physical interface, and two MPLS TE tunnels are set on the VLAN interface. The fault monitoring technology, such as BFD (Bidirectional Forwarding Detection), is configured on the VLAN interface. Monitoring) to monitor faults. If BFD detects that one of the VLAN interfaces on the physical interface is faulty (for example, the IP address of the VLAN interface is deleted), BFD will notify the forwarding engine that the physical interface is unavailable. This causes other VLAN interfaces on the physical interface. The business on it cannot be used. Therefore, the prior art solution cannot provide the MPLS TE FRR function.

In an embodiment of the present invention, an FRR backup tunnel is established for an MPLS TE tunnel that needs to perform link protection in the case of performing link protection on the MPLS TE tunnel. For example, the FRR backup tunnel of the MPLS TE tunnel II shown in Figure 1 is P1—P3—P2. The backup tunnel is used to protect the MPLS TE FRR from the MPLS TE tunnel II between the PI and P2 devices.

The steps to implement the MPLS TE FRR function include:

Step 21: Perform BFD on VLAN interface 2 on P1 to perform fault monitoring on VLAN interface 2. The method may include: after the MPLS TE tunnel II and the FRR backup tunnel shown in FIG. 1 are formed on the PI device, the outbound interface of the MPLS TE tunnel II is the VLAN interface 2, and the next hop IP address based on the tunnel II is obtained. The corresponding state table is set, and the next hop IP address and the BFD monitoring unit configured on the VLAN interface 2 are set as the corresponding relationship.

Step 22: If the BFD monitoring unit finds that the next hop IP address of the VLAN interface 2 cannot be reached, the information of the next hop IP address of the VLAN interface 2 cannot be directly notified to the tunnel forwarding engine by using the correspondence formed in the step 21; The tunnel forwarding engine performs the FRR switch immediately after receiving this information. That is, the traffic transmitted on the original MPLS TE tunnel II is switched to the backup tunnel for a predetermined time to continue forwarding, thereby minimizing the loss caused by the failure of the next hop IP address of the VLAN interface 2, and improving the tunnel. reliability. The predetermined time is generally less than 50 ms. The tunnel forwarding engine is a functional entity with information forwarding function in the MPLS TE tunnel.

In this way, by modifying the state table of the next hop IP address, performing FRR switching can provide

The MPLS TE FRR function of the VLAN interface can quickly switch the user data service to the backup tunnel when the MPLS TE tunnel fails.

The structural diagram of the device embodiment of the present invention is shown in FIG. 2, and includes:

An available bandwidth allocation unit, configured to allocate an available bandwidth to the MPLS TE tunnel corresponding to the VLAN interface on the physical interface according to the determined current assignable bandwidth value;

And a bandwidth update unit, configured to update and save the current assignable bandwidth value of the physical interface according to the allocated bandwidth value of the current allocation.

The allocatable bandwidth value determining unit specifically includes:

An allocated bandwidth value determining unit, configured to determine an allocated bandwidth value of the physical interface according to an allocated bandwidth value of a VLAN interface on the physical interface; and/or other bandwidth values allocated on the physical interface In the embodiment of the present invention, the allocated bandwidth value determining unit may be an RSVP unit;

a current allocatable bandwidth value determining unit, configured to determine a current allocatable bandwidth of the physical interface according to the allocated bandwidth value of the physical interface determined by the allocated bandwidth value determining unit, and a total allocatable bandwidth value of the physical interface In the embodiment of the present invention, the current allocatable bandwidth value determining unit may be a CSPF unit and an RSVP unit.

If the system provides the MPLS TE FRR function, the system further includes:

An FRR backup tunnel establishing unit is configured to establish an FRR backup tunnel for the MPLS TE tunnel that needs to be protected by the link.

The status table modification unit, if the next hop IP address of the VLAN interface on the MPLS TE tunnel is unreachable, the state table for recording the next hop IP address of the MPLS TE tunnel is modified; The FRR switch execution unit is configured to perform FRR switching according to the modified state table, and switch the transmitted data traffic to the FRR backup tunnel for a predetermined time to continue forwarding.

In summary, in the carrier-grade Ethernet, the bandwidth of the MPLS TE tunnel based on the VLAN interface is provided by using the technical means of allocating the available bandwidth for the MPLS TE tunnel corresponding to the VLAN interface on the physical interface. The effect of ensuring a reasonable allocation of bandwidth resources on the MPLS TE tunnel is achieved. In the embodiment of the present invention, the state table of the next hop IP address is modified, and the technical solution of the FRR switching is implemented, and the MPLS TE FRR function based on the VLAN interface is provided, in the case that the MPLS TE tunnel fails. The ability to quickly switch user data services to backup tunnels.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A method for implementing MPLS TE on a VLAN interface, where the method includes:

Determining the current assignable bandwidth value of the physical interface;

2. The method according to claim 1, wherein the determining the current assignable bandwidth value of the physical interface comprises:

A current assignable bandwidth value for the physical interface is determined based on an allocated bandwidth value of the physical interface and a total assignable bandwidth value of the physical interface.

3. The method of claim 2, wherein the allocated bandwidth value of the physical interface comprises an allocated bandwidth value of a VLAN interface on the physical interface; and/or the physical interface is allocated Other bandwidth values.

4. The method of claim 1, further comprising: updating a current assignable bandwidth value of the physical interface according to an available bandwidth value allocated for the MPLS TE tunnel and saving.

5. The method of claim 1, wherein the method further comprises:

If the MPLS TE tunnel needs to perform link protection, establish a fast reroute FRR backup tunnel; and perform fault monitoring on the MPLS TE tunnel;

If the IP address of the next hop network layer protocol of the VLAN interface on the MPLS TE tunnel is unreachable, the state table for recording the next hop IP address of the MPLS TE tunnel is modified, and the MPLS needs to be The data traffic transmitted on the TE tunnel is switched to the FRR backup tunnel for transmission within a predetermined time.

A device for implementing MPLS TE on a VLAN interface, where the device includes:

The assignable bandwidth value determining unit is configured to determine a current allocatable bandwidth value of the physical interface, and the available bandwidth allocating unit is configured to: MPLS TE corresponding to the VLAN interface on the physical interface according to the determined current assignable bandwidth value The tunnel allocates available bandwidth.

The apparatus according to claim 6, wherein the allocatable bandwidth value determining unit specifically includes: An allocated bandwidth value determining unit, configured to determine an allocated bandwidth value of the physical interface according to an allocated bandwidth value of a VLAN interface on the physical interface; and/or other bandwidth values allocated on the physical interface ;

a current allocatable bandwidth value determining unit, configured to determine a current allocatable bandwidth of the physical interface according to the allocated bandwidth value of the physical interface determined by the allocated bandwidth value determining unit, and a total allocatable bandwidth value of the physical interface value.

The device according to claim 6 or 7, wherein the device further comprises: a bandwidth update unit, configured to update a current assignable of the physical interface according to an available bandwidth value allocated for the MPLS TE tunnel Bandwidth value and save.

The device according to claim 6 or 7, wherein the device further comprises:

An FRR backup tunnel establishing unit is configured to establish an FRR backup tunnel when the MPLS TE tunnel needs to perform link protection.

a status table modification unit, if the next hop IP address of the VLAN interface on the MPLS TE tunnel is unreachable, the state table for recording the next hop IP address of the MPLS TE tunnel is modified; And, according to the modified state table, the data traffic that needs to be transmitted on the MPLS TE tunnel is switched to the FRR backup tunnel for a predetermined time to continue forwarding.