Layer 2 forwarding method and forwarding device

Abstract

The invention discloses a two-layer forwarding method, which includes: pre-configuring the association relationship between the uplink and downlink virtual switching planes, the forwarding device receives the broadcast or unknown unicast message sent by the user, and transfers the message to the uplink virtual switching plane The uplink port broadcasts; the forwarding device receives the message sent by the POP, determines the associated uplink virtual switching plane, and learns the source MAC address of the message into the uplink virtual switching plane; after that, the forwarding device receives the message sent by the user The unicast packet is known, and the packet is sent out by searching the port corresponding to the destination MAC address of the packet in the uplink virtual switching plane. The invention also discloses a forwarding device, comprising: an uplink and downlink virtual switching plane association module, an uplink message forwarding module, a downlink message forwarding module, and an uplink MAC forwarding table storage module. The present invention enables the forwarding device to prohibit the direct two-layer intercommunication between users without configuring complicated port isolation schemes and without configuring the MAC addresses of POP points.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to a two-layer forwarding method and forwarding equipment. Background technique [0002] In the operator's network, the entire network from the access network to the operator's service provision point (PoP, Point of Presence) through the metropolitan area network may use Ethernet transmission technology, and the entire network can be regarded as a huge two-layer Ethernet network , the Layer 2 Ethernet network can be actually constructed using an Ethernet switch, or can be constructed virtually using other technologies such as: Virtual Private LAN Service (VPLS, Virtual PrivateLAN Service) technology. For security and profit considerations, it is required to prohibit direct Layer 2 intercommunication between users on the Layer 2 Ethernet network, that is, users are not allowed to communicate through the access network or the MAN. Such as figure 1 As shown, intercommunicat...

AI Technical Summary

Problems solved by technology

[0018] 2. The scope of application is limited. For the case where the network topology of the metropolitan area network is an Ethernet ring network, the port isolation method is no longer effective, because: the uplink port of the Ethernet ring network device will not only receive the data sent by the user through the ring network. The uplink message will also receive the downlink message from the POP, where the downlink message is sent to the user port or the user-facing port of the device, while the uplink message is sent to other uplink ports, and because the uplink , the downlink packets belong to the same VLAN, the device cannot distinguish between the two packets, therefore, the port isolation scheme cannot be configured

It takes a long time for the access network equipment to recover from the discovery of a POP failure to the switch to the standby POP equipment, generally reaching the second level, which does not meet the requirements of the telecom operator for a failure time of no more than 50ms; if the access network equipment uses a similar and POP point The fast handshake fault detection method to reduce the fault recovery time will increase the requirements for access network equipment, which will undoubtedly greatly increase the cost of access network equipment

[0021] 2. High requirements for access network equipment

The access network device must have the ability to discover POP points; the access network device must also be configured with rules that only allow specific MAC address packets to pass through. In order to ensure performance, special hardware is usually required, which increases the complexity of the access network device. sex and cost

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