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Method and system for checking permanent virtual circuit state and data communication device

A permanent virtual circuit and state query technology, applied in the field of data communication, can solve problems such as increased system cost, poor FRF.1 compatibility, and reduced query efficiency, and achieve the effects of improving compatibility, reducing system cost, and improving efficiency

Inactive Publication Date: 2007-04-11
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] 1. When the DCE cannot send all the PVC information through a status message, the DTE needs to send the full status continuation query message to the DCE multiple times, which increases the signaling overhead of the system, increases the query time, and reduces the query efficiency
[0015] 2. Compared with FRF.1, FRF.1.2 adds new message types: full status continuation query message and full status continuation message, so the compatibility with FRF.1 is poor
[0016] 3. It is necessary to modify the implementation mechanism of the current LMI state machine, which increases the system cost

Method used

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  • Method and system for checking permanent virtual circuit state and data communication device
  • Method and system for checking permanent virtual circuit state and data communication device
  • Method and system for checking permanent virtual circuit state and data communication device

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Embodiment Construction

[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0056] Fig. 2 is the flow chart that carries out PVC state inquiry that the embodiment of the present invention provides, as shown in Fig. 2, its specific steps are as follows:

[0057] Step 201: DTE detects the start of this PVC status query process, sends a full status query message to DCE, and starts a timer T391.

[0058] Usually, the timer T391 is also used as the start timer of the PVC status query process, and when T391 times out, a new round of the PVC status query process is started.

[0059] Step 202: After the DCE receives the full status query message, it judges whether the maximum status (status) message that can be sent under the interface can accommodate the interface connected to the DTE by itself according to the MTU size supported by the interface connected to the DTE. All PVC information of , if yes, go to step 203...

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Abstract

This invention discloses an enquiry method for PVC state including: after DCE receives a full state enquiry message sent by DTE, it judges if the largest state message of its interface can't contain all PVC information of the interface according to the size of the MTU connected to its DTE, then it contains all PVC information in more than one state messages to be sent to the DTE and sets an instruction that the succeeded state reports in the state message not to be sent the last, namely, the existence of succeeded message is shown by setting the preserved bit of a first state segment of a state message to be 1. A PVC enquiry system is disclosed including: DTE and DCE containing a state message judgment generation module and a state message transmission module.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to a method and system for querying the state of a permanent virtual circuit and a data communication device. Background technique [0002] In the frame relay communication system, the data terminal equipment (DTE) needs to know whether the permanent virtual circuit (PVC) of the data communication equipment (DCE) is active, whether the PVC still exists, and whether a new PVC is established, so as to Configure the PVC on the local end according to the information, so that the PVC configuration on the local end is synchronized with that on the DCE. At present, the mutual notification of PVC status, link integrity verification, etc. are completed between DTE and DCE through the local management interface (LMI) protocol. [0003] The frame relay standard FRF.1 stipulates that all PVC information of an interface must be packaged into a status (Status) frame and sent. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08H04L12/56H04L12/46H04L12/70
Inventor 黄敦
Owner NEW H3C TECH CO LTD