CN101179455A

CN101179455A - Method and system for implementing VLAN based port loop detection

Info

Publication number: CN101179455A
Application number: CNA200710196865XA
Authority: CN
Inventors: 文林; 杨自鹏; 毛继平; 张海峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-12-07
Filing date: 2007-12-07
Publication date: 2008-05-14

Abstract

The invention provides a system for detecting a loopback on a port based on a VLAN. The invention includes the following steps: a module for constructing detection message of a VLAN loopback, which is used for constructing the detection message of the VLAN loopback; a data transmitting module used for transmitting the detection message of the VLAN loopback; a data receiving module used for intercepting and receiving the detection message of the VLAN loopback and an analysis module of the VLAN loopback used for analyzing the received detection message of the VLAN loopback and confirming the VLAN with a loopback. The invention also provides a method for realizing detection of the loopback on the port based on the VLAN, in which, the detection message of the VLAN loopback is constructed and transmitted; after intercepting and receiving the message, the invention analyzes and judges whether the VLAN has any loopback. The invention eliminates hidden trouble in the existing method for detecting the loopback on a port.

Description

A kind of implementation method and system that detects based on the port loop of VLAN

Technical field

The present invention relates to data communication field, be specifically related to a kind of implementation method and system that detects based on the port loop of Virtual Local Area Network.

Background technology

Along with the high speed development of information technology, the composition of network becomes increasingly complex, and network topology is varied, wherein more commonly Star Network and looped network.In the network of reality, in case network loop occurs, will cause broadcast storm, cause network paralysis, therefore there have been various Spanning-Tree Protocols to guarantee that the network equipment in the looped network loop can not occur.But Spanning-Tree Protocol can not be judged single port and whether have loop that therefore, each equipment vendors has developed the technology of single port loop detection voluntarily, prevents that loop from appearring in single port.

The implementation of existing loop detection, as shown in Figure 1, it is loop detection message (also claiming to detect bag) by constructing a particular medium access control (MAC) address, characteristics according to loop broadcasting, in case loop takes place down this port, whether detection messages will be returned detection port, correct by the target MAC (Media Access Control) address of judging message, whether be that the port sends simultaneously, determine whether there is loop under this port.

The treatment mechanism of existing port loop detection can't judge that loop takes place concrete that VLAN under the port, has following potential safety hazard:

At first, as shown in Figure 2, loop takes place in VLAN 2 on the equipment 2, and No. 1 port of equipment 1 will detect loop.Detection port does not belong to the VLAN that loop takes place, but this port may be blocked or close mistakenly.

Secondly, when detecting loop,, increased the difficulty that the engineering staff searches the physical link that loop takes place, in time cancellation loop owing to can't know it specifically is that loop takes place that VLAN.

Summary of the invention

The invention provides a kind of implementation method and system that detects based on the port loop of VLAN, eliminated the potential safety hazard that exists in the existing port loop detection treatment mechanism.

The invention provides a kind of implementation method that detects based on the port loop of VLAN, comprise the steps:

Step 1: structure VLAN loop detection message also sends;

Step 2: intercept the VLAN loop detection message, receive message after, judge according to message whether this VLAN exists loop.

Further, in the described step 1, will detect VLAN ID according to the 802.1Q agreement and insert loop detection message, write down this VLAN ID simultaneously.

Further, in the described step 2, receive message after, check whether the VLAN ID in the message consistent with the VLANID that needs detection, if unanimity then judge that there is loop in this VLAN.

The present invention also provides a kind of system that detects based on the port loop of VLAN, comprises VLAN loop detection message constructing module, data transmission blocks, data reception module, VLAN loop analysis module; Wherein VLAN loop detection message constructing module is used to construct the VLAN loop detection message; Data transmission blocks is used to send the VLAN loop detection message; Data reception module is used to intercept and receives the VLAN loop detection message; VLAN loop analysis module is used to analyze the VLAN loop detection message that receives, and determines to take place the VLAN of loop.

Further, described VLAN loop detection message constructing module is characterized in that, according to the 802.1Q agreement VLAN ID that needs detect is inserted loop detection message, writes down this VLAN ID simultaneously.

Further, described VLAN loop analysis module is characterized in that, VLAN ID in the message and the VLAN ID that need to detect is compared, if unanimity then judge that there is loop in this VLAN.

Compare with existing loop detecting method, the present invention is keeping on the present loop detection function basis, increased the function of the VLAN of definite generation loop, promptly in detection messages, add VLAN ID, the realization loop detection message is broadcasted in the VLAN of required detection, when finding loop, the concrete VLAN that loop can the correct analysis outbound port takes place down, not only avoided the action of the mistake of loop detection, also make things convenient for the engineering staff to check the physical link that loop takes place, in time cancellation loop.

Description of drawings

Fig. 1 is the handling process of existing general loop detection;

Error detection VLAN figure when Fig. 2 is general loop detection;

Fig. 3 is the concrete handling process based on the vlan port loop detecting method of the present invention;

Fig. 4 is a system block diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing this aspect is further described.

Fig. 3 is the concrete handling process based on the vlan port loop detecting method of the present invention, mainly may further comprise the steps:

The first step is according to general loop detection message mechanism structure detection messages.

In second step, the VLAN ID that needs detect is inserted in the loop detection message according to the 802.1Q agreement.

The 3rd step started loop detection message and sends process, sent loop detection message, write down the VLAN ID that is detecting simultaneously.

The 4th step started loop detection message and intercepts process, received loop detection message.

The 5th step received after the loop detection message, judged whether purpose MAC and port mate the purpose MAC and the detection port of loop detection.

The 6th step, VLAN ID in the loop detection message and the VLAN ID that checks are compared, if consistent, confirm that then loop has taken place this VLAN.

Fig. 4 is a system block diagram of the present invention, comprises VLAN loop detection message constructing module, data transmission blocks, data reception module, VLAN loop analysis module.

VLAN loop detection message constructing module generates the loop detection message that detects based on VLAN, and method for optimizing is according to the 802.1Q agreement VLAN ID that needs detect to be inserted in the general loop detection message.

Data transmission blocks starts loop detection message and sends process, sends loop detection message, writes down the VLAN ID that is detecting simultaneously, as the loop detection message validity checking sign that receives.

Data reception module starts loop detection message and intercepts process, receives loop detection message.

VLAN loop analysis module is analyzed the loop detection message that receives, judge whether purpose MAC and port mate the purpose MAC and the detection port of loop detection, if coupling, further VLAN ID in the loop detection message and the VLAN ID that checks are compared, if consistent, confirm that then loop has taken place this VLAN.

Claims

1. an implementation method that detects based on the port loop of VLAN is characterized in that, comprises the steps:

Step 1: structure VLAN loop detection message also sends;

2. the implementation method of the port loop detection message based on VLAN as claimed in claim 1 is characterized in that:

In the described step 1, will detect VLAN ID according to the 802.1Q agreement and insert loop detection message, write down this VLANID simultaneously.

3. the implementation method of the port loop detection message based on VLAN as claimed in claim 1 is characterized in that:

In the described step 2, receive message after, check whether the VLAN ID in the message consistent with the VLAN ID that needs detection, if unanimity then judge that there is loop in this VLAN.

4. a system that detects based on the port loop of VLAN is characterized in that, comprises VLAN loop detection message constructing module, data transmission blocks, data reception module, VLAN loop analysis module;

Described VLAN loop detection message constructing module is used to construct the VLAN loop detection message;

Described data transmission blocks is used to send the VLAN loop detection message;

Described data reception module is used to intercept and receives the VLAN loop detection message;

Described VLAN loop analysis module is used to analyze the VLAN loop detection message that receives, and determines to take place the VLAN of loop.

5. VLAN loop detection message constructing module as claimed in claim 4 is characterized in that, according to the 802.1Q agreement VLAN ID that needs detect is inserted loop detection message, writes down this VLAN ID simultaneously.

6. VLAN loop analysis module as claimed in claim 4 is characterized in that, VLAN ID in the message and the VLAN ID that need to detect is compared, if unanimity then judge that there is loop in this VLAN.