Route selection method, system thereof, service processing unit and programmable interface plate

Abstract

The invention discloses a route selection method which can ensure the consistency of equivalent route selection and is applied to a system at least comprising a service CPU, a first interface plate and a second interface plate; the first interface plate is programmable and the second interface plate is not programmable or finitely programmable; the equivalent routes with equal quantity and consistent arrangement are sent down to the service CPU, the first interface plate and the second interface plate; the service CPU calculates the equivalent route selection index and selects the equivalent route of the messages by adopting the equivalent route algorithm of the second interface; for the messages to be sent down to the first interface plate, the service CPU carries with the equivalent route selection index thereof in the message; the first interface plate selects the equivalent route according to the equivalent route selection index carried along by the message; and the service CPU needs not to carry out special treatment to the messages to be sent down to the second interface plate. The invention also discloses a route selection system, a service processing unit and a programmableinterface plate. The invention can ensure the consistency of the equivalent route selection.

Description

technical field [0001] The invention relates to routing technology, in particular to a routing method, a routing system, a service processing unit and a programmable interface board for ensuring the consistency of equal-cost routing. Background technique [0002] Equal-cost routing refers to several different routes with the same cost that exist to a destination at the same time, and packets are sent on these routes in a balancing manner, thus implementing load balancing. [0003] There are generally two methods for load balancing of equal-cost routes, one is packet-by-packet forwarding, and the other is stream-by-flow forwarding. Packet-by-packet forwarding can ensure that the load is evenly shared on each equal-cost path, but the problem is that the same packet flow may be shared on different forwarding paths, which causes some flow-based services to fail to work properly. Therefore, the current equal-cost routing generally adopts flow-by-flow forwarding, that is, Hash op...

AI Technical Summary

Problems solved by technology

[0015] However, the problem with this solution is that a service CPU can only serve the NP interface board or the ASIC interface board, and cannot serve as the NP interface board or the ASIC interface board at the same time. If the NP interface board and the ASIC interface board in the system need the service CPU at the same time , at least two service CPUs need to be configured to serve the NP interface board and the ASIC interface board respectively, thus increasing the cost

[0016] It can be seen that the existing technology can only solve the problem of the consistency of the equivalent routes selected by the service CPU and one of the interface boards, but cannot solve the problem of the consistency of the equivalent routes selected by the service CPU, the NP interface board and the ASIC interface board.

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