Aggregation type link bidirectional forwarding detection method and device thereof

A bidirectional forwarding detection and link technology, applied in the field of data communication, can solve the problems of network flapping, session switching constantly, and bidirectional forwarding detection session cannot be quickly detected, etc., to achieve the effect of improving stability and enhancing applicability

Active Publication Date: 2013-08-14
MAIPU COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) All sessions are concentrated on the main control card, which increases the burden on the main control card, resulting in the inability to quickly detect bidirectional forwarding detection sessions
(2) When the main control card fails and a link corresponding to the line card does not fail, the bidirectional forwarding detection session may get an error notification
However, the overall migration of bidirectional forwarding detection sessions in aggregated links means that sending and receiving bidirectional forwarding detection control packets must be performed on the same line card, which limits the application of bidirectional forwarding detection sessions to detect aggregated links
On the other hand, if the physical link that receives and sends the bidirectional forwarding detection control packet is not the same physical link, it may cause continuous switching of the session, resulting in the loss of the bidirectional forwarding detection control packet and even network vibration.

Method used

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  • Aggregation type link bidirectional forwarding detection method and device thereof
  • Aggregation type link bidirectional forwarding detection method and device thereof
  • Aggregation type link bidirectional forwarding detection method and device thereof

Examples

Experimental program
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Embodiment 1

[0048] image 3 Describes the BFD session establishment method and establishment process in the network environment, and the switching process after the non-receiver of the BFD session receives the BFD control message. In order to further illustrate the steps, combined figure 2 An example was given. figure 2 It is a network structure diagram based on aggregation links. The network is interconnected by two devices, Device A and Device B. Both Device A and Device B are distributed devices, which can be routers, switches or other network devices. Device A consists of a main control card and three line cards LC1, LC2, and LC3, and device B consists of a main control card B and a line card LC1. The physical links L2 and L3 indicated by the solid line in the figure take effect, and the physical link L1 indicated by the dotted line fails. The cause of the failure may be that the link is manually shut down or a link failure occurs. L1, L2, and L3 have been added to the aggregated ...

Embodiment 2

[0071] In this example, if Figure 4 As shown, the line card retains the second switching module, cuts out the first switching module on the main control card, and the switching of the sender or receiver of the BFD session is completed by the second switching module of the line card. When the aggregation link changes due to the addition or deletion of a certain physical link, the second switching module of the line card switches the sender or receiver of the BFD session.

[0072] Proceed as follows:

[0073] Step 401: The upper-layer application protocol sends a session establishment message, and BFD detection needs to be performed on the aggregation link, which is the same as step 301 in Example 1.

[0074] Step 402: The first notification module on the main control card notifies the line card where the aggregated link is located to establish a corresponding BFD session, which is the same as step 302 in Example 1.

[0075] Step 403: Initially select the sender and receiver ...

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Abstract

The invention provides an aggregation type link distributed bidirectional forwarding detection method which can realize the separation of receiving and sending of a bidirectional forwarding detection control packet, and a device for realizing the method. The aggregation type link bidirectional forwarding detection method comprises the following steps: using a main control card to initially selecta sender and a receiver of the bidirectional forwarding detection control packet, and needing to switch the sender or the receiver when the main control card perceives the change of a physical link of an aggregation type link, wherein one aggregation type link only has one sender and one receiver. The method switches the receiver or the sender of the bidirectional forwarding detection control packet rather than switching a bidirectional forwarding detection conversation, and the receiver and the sender can be positioned in different line cards, thereby solving the problem that the existing bidirectional forwarding detection conversation is constantly switched in the aggregation type link.

Description

technical field [0001] The present invention relates to network technologies in the field of data communication, and in particular to bidirectional forwarding detection (Bidirectional Forwarding Detection, BFD) technology of aggregation links. Background technique [0002] The BFD protocol is a standardized and unified detection mechanism for the entire network, which is used to quickly detect and monitor the connectivity status of paths or IP routing and forwarding in the network. It provides a general, standardized, medium-independent, and protocol-independent fast fault detection mechanism, which can uniformly and quickly detect the two-way failure between two devices for various upper-layer application protocols such as routing protocols and MPLS (Multiprotocol Label Switching). Failure of the forwarding path. [0003] Bidirectional forwarding detection is a high-speed stand-alone HELLO protocol that can be used to detect any type of path failure between a pair of adjac...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04L12/70H04L12/26H04L45/28
Inventor李永合徐海兵尹茂周跃文
OwnerMAIPU COMM TECH CO LTD