Method and device of maintaining MAC item of distributed network processing system

Abstract

The invention discloses a method and a device for maintaining an MAC table entry inside a distributed network processing system, which are applicable for the distributed network processing system including an interface board and a plurality of service boards. The method includes the following steps: studying on the MAC table entry is carried out on the service boards according to a message flow forwarded by the interface board; the MAC table entry required to be studied is saved in a first MAC table at the local area and is saved inside a first MAC table of other service boards as well as a second MAC table maintained by the interface board at the same time; aging maintenance is carried out for the second MAC table according to the message flow of the interface board and the corresponding MAC table entry inside the first MAC table is deleted at the same time. The invention also discloses a distributed network processing system. Thereby, data transmission interruption caused by re-studying a MAC address is avoided, the continuity and efficiency of data transmission processing is guaranteed, and problems of data packet loss and flooding caused thereof are avoided.

Description

technical field [0001] The present invention relates to the field of communication technology, and in particular to a method for maintaining MAC entries in a distributed network processing system, a device for maintaining MAC entries in a distributed network processing system, and a distributed network processing system. Background technique [0002] MAC (Media Access Control, Media Access Control) entry is an important parameter for message forwarding in network processing systems (such as switches, gateways, hardware firewalls, etc.), and the message passes through the MAC address and PORT (port) in the MAC entry The corresponding relationship can realize sending from the required port instead of sending to all ports in the form of broadcast. Since the storage space in the network processing system is limited, unmatched MAC entries must be deleted according to certain rules, that is, the MAC entries are aged. [0003] With the continuous improvement of network data transm...

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Problems solved by technology

[0006] However, the mutual independence of such service boards determines that each service board will age according to its own rules and time, which will inevitably lead to the out-of-sync status of the MAC entries maintained by each service board, thus causing many problems

For example, suppose that after the service board 1 and the service board 2 respectively learn the MAC address, there is the same MAC entry: MAC A → PORT 0; if within a certain period of time, the destination MAC (Destination MAC, DMAC for short) address is MAC A The packet flow of MAC A has been kept in the state of only service board 2, and service board 1 will age the entry because it does not receive the packet flow of MAC A within the set time; since the entry in service board 2 will not be Aging, so the MAC entries of the two boards are no longer consistent; if the DMAC is MAC A at this time, the message flow is migrated to the service board 1 for processing, and the service board 1 will perform MAC again because it cannot find the corresponding MAC entry. The learning of the address destroys the continuity of the data transmission processing process, which not only reduces the efficiency of the data transmission processing, but also may cause data packet loss and flooding during the data transmission process, especially the occurrence of a large number of flooding phenomena. The occurrence will have an impact similar to that of a broadcast storm on the forwarding performance of the network processing system, resulting in the downtime of the network processing system

[0007] To sum up, since each service board in the distributed network processing system independently maintains its own MAC table entries, it may cause many problems such as packet loss, flooding, and packet stream failure to send normally. No corresponding solution exists

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