Equipment and method for speeding up poly spanning tree protocol network topological convergence

Abstract

The invention discloses a method and system for accelerating multi-spanning tree protocol (MSTP) network topology convergence. The method includes that the MSTP equipment receives BPDU message, and if the message is detected out of inside domain and the domain root is the MSTP, but the common root in the message is inconsistent with the common root of MSTP, or the external path overhead information is not inconsistent with the MSTP external path overhead information or the domain root information is inconsistent with the domain root information, then discards the BPDU message. The invention prevents the invalid old root information from being cyclically forwarded in the field and accelerates the convergence of MSTP network topology in multi-domain environment.

Description

technical field [0001] The invention relates to the technical field of network topology convergence, in particular to a method for accelerating the network topology convergence of Multiple Spanning Tree Protocol (MSTP, Multiple Spanning Tree Protocol) and MSTP equipment. Background technique [0002] MSTP is currently the most common redundant backup technology for Ethernet. However, MSTP has imperfections in practical applications. For example, in a multi-domain environment, the convergence time of MSTP increases significantly and becomes unstable after the root port of the domain root device is disconnected. [0003] The following describes a situation where MSTP old root information remains in the network, resulting in unstable convergence of the MSTP network topology and increased convergence time, as shown in Figures 1 to 6: [0004] As shown in Figure 1, DUT1 is the general root bridge of the entire network and belongs to domain A; DUT2, DUT3, and DUT4 belong to domai...

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Problems solved by technology

[0014] Through comparison so far, it can be found that Figure 6 is exactly the same as Figure 3. The MSTP calculation message carrying the old root information circulates in domain B, and then the message will continue to circulate, causing the MSTP network topology to fail to converge quickly.

[0015] According to the above description, the network topology will never be stable, but because there is a Message Age field in the MSTP calculation message, it will indicate how long the message has been transmitted in the network, and its value will increase every time it passes through the MSTP device. When the value is greater than Max Age, the message will be discarded as an illegal message, so the old root in the network will eventually be aged out, and the network topology can be stable

[0016] To sum up, in the existing MSTP mechanism, there may be a phenomenon that invalid old root information is forwarded circularly in the domain, which makes the MSTP network topology unable to quickly converge

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