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Method and device for establishing pseudowire mapping

A pseudowire and mapping relationship technology, applied in the field of communication, can solve the problems of occupying bandwidth, unable to guarantee the consistency of two-way service delay, etc., and achieve the effect of saving bandwidth

Inactive Publication Date: 2011-09-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The method described in the prior art establishes a PW based on a one-way tunnel, but the tunnels in the aggregation network are usually bidirectional, and there are multiple tunnels between two PEs, but the above method cannot guarantee that the pseudowires on both sides will are mapped to the same bidirectional tunnel, so the PW established by the above method cannot guarantee the consistency of bidirectional service delay, jitter and other parameters; in addition, if the PW bears different tunnels, when one of the tunnels fails, at this time The service is interrupted, but the PW in another tunnel still occupies the bandwidth

Method used

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  • Method and device for establishing pseudowire mapping

Examples

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Embodiment 1

[0030] Example 1: The specific implementation of the present invention provides a method for establishing pseudo wire mapping. For the convenience of description, set the first node as PE A and the second node as PE B. The specific steps of the method are as follows: figure 2 Shown, including:

[0031] Step 21: PE A sends a first Label Mapping message, where the first Label Mapping message carries a forward tunnel identifier and a forward pseudowire label;

[0032] The method for implementing the forward tunnel identifier in the first Label Mapping message in this step can be to add a tunnel identifier field to the Pseudowire identifier Type (Length, Value, PWid TLV) object of the Label Mapping message. The tunnel identifier field is used to carry the forward tunnel identifier. Of course, the tunnel identifier can also be loaded in other positions of the first Label Mapping message. The specific embodiment of the present invention is not limited to the specific position of the tunn...

Embodiment 2

[0042] Embodiment 2: The specific implementation of the present invention provides a method for establishing pseudo wire mapping. The technical scenario of this embodiment is that the pseudo wire mapping is established in PBB-TE in this embodiment. The tunnel label is ESPID, and the pseudo wire The label is I-SID. In this embodiment, the pseudo wire mapping in the direction from PE A to PE B is set as forward pseudo wire mapping, of course, it can also be set as reverse pseudo wire mapping. PE A and PE B in this embodiment The connection is like image 3 Shown. The method described in Example 2 is Figure 4 As shown, including the following operations:

[0043] Step 41: PE A sends a first LabelMapping message with a forward ESP ID and a forward I-SID to PE B;

[0044] The forward ESP ID in the above steps can be specifically, , Where MAC_A and MAC_B are the MAC addresses of nodes PE A and PE B, respectively, and B-VID1 is a VLAN identifier. The I-SID in this step is the pseudowi...

Embodiment 3

[0051] Embodiment 3: The specific implementation of the present invention provides a method for establishing pseudowire mapping. The technical scenario of this embodiment is that the pseudowire establishment in this embodiment is between PE A and PE in an MPLS / T-MPLS network. The connection between PE A and PE B in the MPLS network is established between B, Figure 5 As shown, the tunnel identifier is LSP ID, the pseudowire label is MPLS PW Label, and the pseudowire mapping from PE A to PE B is defined as a forward pseudowire mapping. For MPLS / T-MPLS networks, when the tunnel identifier is LSP ID, a bidirectional LSP will have a corresponding LSP ID in the management or control plane. At this time, the forward LSP ID and the reverse LSP ID are actually the same LSP ID. That is, the forward tunnel identifier at this time is the same as the reverse tunnel identifier corresponding to the tunnel identifier. However, for the convenience of description, this embodiment still divides t...

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Abstract

The invention provides a method and a device for establishing pseudowire mapping, belonging to the communication field. The method comprises the following steps: a first node transmits a first label mapping message which is provided with a positive tunnel mark and a positive pseudowire label; a second node receives the first label mapping message and establishes the positive pseudowire mapping relation between the positive pseudowire label and a tunnel label corresponding to the positive tunnel mark. The invention also provides the device for establishing the pseudowire mapping, and a node device, which can ensure that pseudowires of two PEs can be mapped in the same bi-directional tunnel, thereby ensuring the consistency of time delay parameters, dithering parameters, and the like in two-way businesses and saving bandwidth in the condition that the pseudowires produce faults.

Description

Technical field [0001] The present invention relates to the field of communications, in particular to a method and device for establishing pseudo wire mapping. Background technique [0002] Pseudo wire Edge to Edge Emulation (PWE3) is an end-to-end Layer 2 service bearing technology. Between two operator network edge nodes (Provider Edge, PE) of the packet switching network, various Layer 2 services between the connected customer edge nodes (CustomerEdge, CE) are simulated through a tunnel. The above-mentioned tunnels are usually tunnels based on packet switching technology, such as MPLS Multiple Protocol Label Switching (MPLS Multiple Protocol Label Switching) tunnels; and common Layer 2 services can be various Layer 2 data packets, bit streams, etc. [0003] Pseudowire (PW) is like a direct connection channel between two PE nodes for the PWE3 system, which completes the transparent transmission of layer 2 data between the nodes. PW is bidirectional, and it consists of two PW la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/46H04L12/56H04L29/06
Inventor 龙昊董继雄
Owner HUAWEI TECH CO LTD
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