Multiple generation tree protocol based domain roots switching method

A multiple spanning tree protocol and its implementation method are applied in the field of network communication to achieve the effect of avoiding temporary loops

Inactive Publication Date: 2004-07-07
HUAWEI TECH CO LTD
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Problems solved by technology

At this time, the MSTI of SWA can also forward packets through the domain

Method used

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  • Multiple generation tree protocol based domain roots switching method
  • Multiple generation tree protocol based domain roots switching method
  • Multiple generation tree protocol based domain roots switching method

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[0020] For the specific implementation method of the implementation method of domain root switching based on multiple spanning tree protocol in the present invention, see figure 2 , including the following steps:

[0021] Step 1: The CIST domain root based on the Multiple Spanning Tree Protocol changes, that is, the CIST domain root switch occurs;

[0022] Step 2: In the UPDATE state of PIM (port information state machine), CIST sets the port variable bChangedMaster of all MSTI instances on the root port of the CIST domain root, that is, makes it equal to TRUE, to represent the CIST domain root in the domain If the port variable bChangedMaster is equal to FALSE, it means that the root of the CIST domain has not changed;

[0023] Step 3: CIST executes the process of dealChangeMaster() (domain root change processing), triggers all MSTI instances on this port to perform port state migration, that is, adds a new processing link in the UPDATE state: CIST executes dealChangedMaste...

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Abstract

An implement method for domain root switching based on Multiple Spanning Tree Protocol (MSTP), this method is: when taking CIST domain to switch, after the precedence information of each port in the exchanger renews by PIM, trigger the switching procedure of handling CIST domain root corresponding to MSTI, to ensure each of MSTI in MST domain knows the information about CIST domain root switching. This method can avoid MSTI comes out temporary loop circuit due to CIST domain root changing.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for implementing domain root switching based on multiple spanning tree protocols. Background technique [0002] IEEE802.1d and IEEE80.1w provide solutions to avoid data loops and realize redundant link backup in simple switching networks; in order to adapt to large complex switching networks with multiple VLANs (Virtual Local Area Networks, Virtual Local Area Network), IEEE802 The .1s Draft14 draft further proposes MSTP (Multiple Spanning Tree Protocol, Multiple Spanning Tree Protocol), which divides one or more switching devices into different MST (Multiple Spanning Tree) domains, and maintains multiple MSTI (Multiple Spanning Tree Protocol) domains in one domain. Spanning tree instance), each MSTI has a different ID (identification), and each MSTI allows data packets of different VLANs to be forwarded according to their own paths. The instances are compl...

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Application Information

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IPC IPC(8): H04L12/24H04L12/26H04L12/28H04L29/06
Inventor 汪勇陈刚苏兴山
Owner HUAWEI TECH CO LTD
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