Three-tier message retransmission method and device

Abstract

The invention discloses a three-tier message retransmission method, comprising the following steps: a processing module records a neighbor software table entry which is retransmitted by the last time normally; a transmission module receives messages sent by user equipment, and sends a neighbor table entry request message to the processing module if the transmission module has no neighbor table entry matched with the destination address of the message; and the processing module searches the matched neighbor software table entry of the last time according to the destination address of the message carried by the request message of the neighbor table entry, if the search is successful, the neighbor software table entry of the last time is taken as a dummy neighbor table entry to be sent to the transmission module, thus leading the transmission module to retransmit the message according to an MAC address in the neighbor software table entry of the last time. When sending the dummy neighbor table entry, the message retransmission of the invention has no loss of the packet again in the process of interactive learning of the neighbor table entry under the condition that the MAC address is in accordance with the recorded neighbor table entry of the last time.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a three-layer message forwarding method and device. Background technique [0002] The switching device is responsible for forwarding a large number of network packets in the network. In order to improve the packet forwarding efficiency of the switching device, packet forwarding and routing table maintenance are usually performed separately. Packet forwarding is completed by the forwarding module of the switching device. The routing table The maintenance is performed by the CPU (Central Processing Unit, central processing unit) of the switching device, thus forming a structure form in which the control component (CPU) and the forwarding component (forwarding module) are separated in the switching device. Since the CPU only completes the processing operations of the message forwarding table with relatively low real-time requirements, its performance requirements are also gre...

AI Technical Summary

Problems solved by technology

[0018] Among them, the delivery of the ARP entry from the server to the switching device and the delivery of the switching route are handled by two parallel tasks. It takes a long time to exchange ARP packets, which causes the routing switch to be sent to the forwarding module before the ARP entry. Send fake ARP entries pointing to the "black hole", so in the process of traffic switching, the corresponding layer 3 forwarding traffic is cut off

[0019] To sum up the above two examples, although the existing technology ensures that the CPU will not be impacted by a large number of unmatched Layer 3 packets, in some cases, the corresponding forwarded packets are forwarded into the black hole and discarded according to the fake ARP. Before the ARP response message is delivered and the ARP entry is actually forwarded, the message will be discarded and will not be forwarded normally

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