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Link state detecting method and apparatus

A technology of link status and detection method, applied in the field of Ethernet physical layer

Active Publication Date: 2010-12-22
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the static detection mode, only when the signal in the PMD channel is not detected at all, the conclusion of the link failure is drawn, and when the signal is relatively weak and not enough to meet the transmission requirements, the link status is still considered normal. This will lead to a relatively high missed detection rate; in the dynamic detection mode, it is necessary to make a large functional modification to the PMA sublayer specified in the existing CTBI protocol, which is more complicated and difficult to implement

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  • Link state detecting method and apparatus
  • Link state detecting method and apparatus
  • Link state detecting method and apparatus

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Experimental program
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Embodiment 1

[0021] In step 101, when it is detected that an information transmission abnormality with a predetermined time length occurs on the virtual channel or a receiving error message is received on the virtual channel, it is determined that a link failure occurs in the virtual channel;

[0022] In step 102, when it is detected that a non-reception error message is received on the virtual channel where a link failure occurs, it is determined that the virtual channel returns to a normal state.

[0023] In Ethernet, a link refers to a transmission path between two physical ports, and a link may include several independent PMD channels. However, failures of the electronic interfaces of the local and peer devices and the PMD channel will lead to link failure. Therefore, in this embodiment, the detection of the link status can be realized by monitoring the virtual channel.

[0024] It can be seen from the above-mentioned steps 101 and 102 that in this embodiment, continuous information tr...

Embodiment 2

[0031] In step 301, it is judged whether there are four consecutive collation mark receiving errors on the virtual channel, if yes, step 302 is performed, otherwise, step 304 is performed.

[0032] After the Ethernet data is encoded by 64B / 66B at the PCS sublayer, it is usually transmitted in units of data blocks with a size of 66 bits (bit). When data is distributed on multiple virtual channels, the data blocks sent simultaneously on each channel will be out of sync due to channel conditions and other reasons, that is, skew will occur. In order to adjust the skew on each virtual channel, it is necessary to insert a proofreading mark with a size of 66 bits every certain number of blocks. The proofreading mark can be in the form of the following table 1:

[0033] Frm1

Frm2

TBD

TBD

~BIP

BIP

~VL#

VL#

[0034] Table 1

[0035] In the proofreading marks in Table 1, Frm1 and Frm2 represent block types. When Frm1 is 0x55 and Frm2 is 0x66, ...

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Abstract

The invention discloses a link status detection method, which comprises determining link failure in a virtual channel when detecting information transmission disorder within the predetermined time period on the virtual channel or receiving reception error information on the virtual channel; and determining the recovery of the virtual channel when detecting that the non-reception error informationis received on the failed virtual channel. The invention also discloses a link status detection device comprising a receiving module and a detection module. The proposal can improve the accuracy of physical layer link status detection and reduce the implementation difficulty.

Description

technical field [0001] The invention relates to the Ethernet physical layer technology, in particular to a link state detection method and device of the Ethernet physical layer. Background technique [0002] With the advancement of the integration of computer networks and telecommunication networks, Ethernet has become an important means of access to metropolitan area networks, and the introduction of next-generation Ethernet technologies such as 10G Ethernet has made The use of Ethernet technology has become the general trend. [0003] In the next-generation Ethernet architecture, the physical layer (PHY) can be divided into: a physical coding (PCS) sublayer, a physical medium attachment (PMA) sublayer, and a physical medium dependent (PMD) sublayer. Among them, the PCS sublayer is used to complete the conversion between data bits and code-groups, generate continuous code-groups to be sent after encoding, and decode the received code-groups; the PMA sublayer mainly perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04L29/08
Inventor 王明辉
Owner NEW H3C TECH CO LTD