Double-attach/multi-attach logical packet network method and supplier equipment

Abstract

This invention provides a double / single attribute logic grouping method based on the BGP and a device of providers including: setting different CE attribute priorities for the PE belonging to the CE in a VPN, each PE gets the CE attribute priority of the far end PE equivalent to it, when the PE decides that the CE attribute priority of the far end PE equivalent to it is not lower than that of the local, it cancels the virtual connection PW with other PE, which effectively avoids the possibility for generating loops and avoid the error study of MAC address and solves the problem of loops in double-attribute and multi-attribute network grouping.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a dual-homing / multi-homing logical networking method and provider equipment based on the border gateway protocol. Background technique [0002] Initially, telecom operators provided links to enterprise users in the form of leased lines. This method is not suitable for the current characteristics of enterprises with many branches and rapid growth, and is relatively expensive and difficult to manage. Since then, with the rise of ATM (Asychorize Transport Mode, Asynchronous Transfer Mode) and FR (Frame Relay, Frame Relay) technologies, telecom operators have begun to use virtual circuits to provide users with point-to-point Layer 2 links. Build your own three-layer network on the link to carry IP (Internet Protocol) and other data flows. Because these technologies provide point-to-point Layer 2 links, the configuration is relatively complicated, especially when adding...

AI Technical Summary

Problems solved by technology

[0033] 2. When the ARP (Address Request Protocol) message sent by CE3 arrives at PE3, set the source MAC address of the message to be A, then PE3 learns that A comes from CE3, and then PE3 sends the ARP The packet is forwarded to PE1, and then PE1 forwards it to CE1. If CE1 is an Ethernet device, CE1 forwards the ARP packet to PE2. After receiving the packet from CE1, PE2 sends it to PE3, and PE3 learns A is sent from the PW side, resulting in a learning error, so that the equipment on the CE1 side, such as other user equipment connected to CE1, cannot send the message to CE3

[0034] In fact, in question 2, after a packet leaving from a PE is forwarded by some devices, it will enter from other PE devices. image 3 The dual-homing network, so that the message will be transmitted between PEs, thus forming a loop, the second solution does not completely solve the loop-free problem

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