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Category Archives: OSPF Election

OSPF Election


今天要來實作OSPF Election(DR/BDR/DROther),因為此項技術可以解決LSAs(Link-State Acknowledgement)額外的Flooding造成頻寬浪費的問題,且不是任何情況都會使Router做OSPF的Election,至少要三顆以上的Router並均跑OSPF才會做Election(P2P不會產生該情況),可透過三種方式來做Election,一為依據開機時間的多寡,最久的為DR,次久的則為BDR(Backup Designated Router),其餘為DROther;二則為按照Router ID做依據,IP越大的會被拿去做Router ID,而可透過自動選取、建立Loopback或手動指定Router-ID(執行第一次Clear會生效,執行第二次Clear會清除手動設置的RID[IOS >= 12.0])來更動Router ID(更動完要執行Clear才會生效);另一則為在跑OSPF的介面上設定Priority,數值越高的越會優先作為DR,設定成零表不參與Election,所以決定Election優先順序為開機時間多寡->Priority數值->Router ID,而下列的實作順序為開機時間多寡->Router ID(預設、Loopback與手動指定)->Priority數值;廢話不多說,直接上實作,如下: Read more »

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