Method and system for transparent transmission of BPDU packet in two-layer switching network

Abstract

The present invention discloses a method and a system for the transparent transmission of BPDU message in a layer 2 switched local area network; the method comprises the following steps of: encapsulating a BPDU message on the end of getting into BPDU tunnel; adding the original purpose MAC address to the encapsulated message; sending the encapsulated message through the BPDU tunnel; on the end of getting out of the BPDU tunnel, executing message forwarding to corresponding user network by obtaining and identifying the original purpose MAC address of the received message. The invention further discloses an input / output device. With the invention, the transparent transmission of the BPDU message of a layer 2 management protocol in layer 2 switched local area network can be realized simply and effectively regarding the specific type of the layer 2 management protocol, so that the applicable the layer 2 management protocol has good expandability and flexibility.

Description

technical field [0001] The invention relates to the technical field of communication networks, in particular to a method and system for transparently transmitting BPDU messages in a two-layer switching network, and also relates to an input / output device. Background technique [0002] The BPDU Tunnel (tunnel) technology allows the BPDU (Bridge Protocol Data Unit, Bridge Protocol Data Unit) of the Layer 2 management protocol from the user network to pass through the Layer 2 switching network (for example, the operator network) in the form of a tunnel, thereby connecting to different For the user network in the region, its BPDU message can realize transparent transmission. [0003] As shown in Figure 1, it shows the working condition of transparently transmitting BPDU packets in a Layer 2 switching network: user network A includes A1 and A2 connected through the carrier network, and configured on the input / output devices at both ends of the carrier network The BPDU tunnel func...

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Problems solved by technology

[0010] This means that the input / output device in the outbound tunnel direction must pre-configure the correspondence between the specific type of the message and the original destination MAC address, and decapsulate each received BPDU message, which undoubtedly increases the input / output The resource overhead of the output device, and the implementation is relatively complicated

Specifically, all input / output devices that receive a BPDU message must perform the step of decapsulation-protocol type field identification, and if it matches the specific type of the message configured on the device, the message will be forwarded according to the original destination MAC address ; If it does not match, it means that the input / output device does not have the corresponding original destination MAC address. If the BPDU message is discarded, the previous processing work such as decapsulation and field identification will become a meaningless waste of resources.

[0011] At the same time, since the input / output device in the outbound direction of the tunnel must be pre-configured with the correspondence between the specific type of the message and the original destination MAC address, this means that the input / output device only supports the Layer 2 management protocol that it can recognize. This also causes the existing BPDU tunneling technology to only solve a few limited and fixed two-layer management protocols, such as STP (Spanning Tree Protocol, Spanning Tree Protocol), 802.1x protocol, IGMP (Internet Group ManagementProtocol, Internet Group Management Protocol), etc.

[0012] It can be seen that the technical solution for transparently transmitting BPDU messages in the Layer 2 switching network in the prior art has the defects of waste of processing resources, poor scalability and flexibility, and there is no proper solution at present

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