In this scheme, every node maintains neighbor nodes ’ information within 2 hops, such as the node ’ forwarding tables . by using this scheme, the number of ponderous packets can be reduced 在該方法中,每個節(jié)點維護2跳以內的鄰居信息,相互傳送轉發(fā)節(jié)點表,由此降低冗余搜索包的產生。
All cards contain one or more lan or wan ports; a forwarding table, which is a simplified version of the full route table; the qbrt hardware; packet-forwarding hardware; buffering capacity; and separate interfaces to the route manager and the switch engine on the control board 所有卡都包括:一個或多個局域網或廣域網端口、一個轉發(fā)表(即完整路由表的簡化版)、qbrt硬件、包轉發(fā)硬件、緩存容量以與控制板上路由管理器和開關引擎獨立的接口。
Based on the degree of urgency of going into graceful ospf restart, the reason of graceful ospf restart is divided into software-restart and hardware-restart, and the way of graceful ospf restart is divided into pre-restart mode and post-restart mode accordingly . after the compare with the traditional ospf realization method and the analysis on the mechanism of the trigger of graceful ospf restart and synchronization of link state database and the exchanging with the route management module ( rtm ), it is figured out that how to choose the restart mode and how to switch from pre-restart mode to post-restart mode, and how to synchronize the link state database, and how to define the interface and process flow exchanging with protocol supporting module, and how to deal with the forwarding table on the condition of multiple route protocols who also have the capability of graceful restart . finally, the idea of graceful ospf restart with two modes above was realized in the t series routers that belong to a telecommunication corporation 本文首先找出了引起溫和重啟的各種原因,然后根據溫和重啟的緊迫程度,提出把溫和重啟的原因分為硬重啟與軟重啟,并設計相應的前啟動模式與后啟動模式;結合傳統(tǒng)ospf協(xié)議的實現(xiàn)方法,通過對其觸發(fā)機制、數據庫同步機制、與支撐模塊的交互機制以及多協(xié)議同時重啟時路由同步機制的分析,解決了在溫和重啟過程中啟動模式如何選擇與切換、數據庫如何同步、與協(xié)議支撐接口如何定義與交互的問題,并揭示出在多協(xié)議同時進行溫和重啟過程中所必須遵循的一般規(guī)律,最終在一個通訊企業(yè)的t系列路由器上實現(xiàn)了兩種模式下基于ospf協(xié)議的溫和重啟。