1.Classless 2.Link-State Protocol 3.靠Hello Packets建鄰居關係，定時送Link-State Advertisement(LSA), LSA會丟給同一個Area的Router(要先建鄰居關係才會交換路由與RIP不同),每個Router會把收到LSA集合成Link State Database,並用SPF演算法算出最佳路徑 Hello Packets(Router ID(獨一無二),Hello and dead Intervals,Area ID,Authentication,Stub Area Flag.....) Hello Packets每10秒丟一次 OSPF有3張Table Adjacency Table (鄰居關係) 需要Hello And Dead Intervals,AreaID,Authentication,Stub Area Flag相同,鄰居關才才會建起來! Topology Database ( Link State Database ) | | (SPF演算法) | V Routing Table (Forwarding Table) OSPF不會定時會更新，只有Topology改變時，才會更新Routing Table ------------------------------------------------------- Router ID ------------------------------------------------------- 預設為所有UP的介面，最大的IP 例如: Router#show ip ospf Routing Process "ospf 168" with ID 10.2.2.2 Supports only single TOS(TOS0) routes Supports opaque LSA SPF schedule delay 5 secs, Hold time between two SPFs 10 secs Minimum LSA interval 5 secs. Minimum LSA arriv
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