Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Passage: Open Shortest Path First (OSPF) i hangaia hei kawa tomokanga o roto (IGP), hei whakamahi i roto i te punaha motuhake penei i te whatunga rohe (LAN). Ka whakatinana i te hātepe a Dijkstra, e mohiotia ana ko te hātepe huarahi poto rawa (SPF). I te mea he kawa arataki hononga-tūnga i runga i te taurangi hononga-tūnga i whakawhanakehia mo te ARPANET i te 1980 me te kawa arataki IS-IS. I whakatauhia tuatahihia te OSPF i te 1989 hei RFC 1131, e mohiotia ana inaianei ko te OSPF putanga 1. Ko te mahi whanaketanga mo te OSPF i mua i tana whakariterite hei paerewa tuwhera i whakahaeretia e te Digital Equipment Corporation, nana nei i whakawhanake i ana ake kawa DECnet. Ko nga kawa whakatere penei i te OSPF e tatau ana i te huarahi poto ki te waahi ma te whatunga i runga i te hātepe. Ko te kawa arataki tuatahi i whakatinanahia whanui, ko te Routing Information Protocol (RIP), i whakaarohia te huarahi poto i runga i nga hops, ara te maha o nga pouara i haerehia e te putea IP kia tae atu ki te kaihautū. I angitu te whakatinana a RIP i te huarahi hihiri, i reira ka huri nga teepu arahi mena ka rereke te topology whatunga. Engari i te wa o te RIP kaore i whakarereke i tana huarahi kia rite ki nga huringa o te whatunga, penei i te tere whakawhiti raraunga. I tipu te hiahia mo tētahi kawa arataki hihiri e taea ai te tātai i te ara tere rawa ki tētahi ūnga. I whakawhanakehia te OSPF kia taea ai te tatau i te huarahi poto rawa i roto i te whatunga i runga i te utu o te huarahi, me te whakaaro ki te roangaru, te roa me te kawenga. Na reira ka whakaekea e te OSPF te tātaitanga o te utu ara i runga i ngā tawhā utu hononga, ka taea te whakataurite e te kaiwhakahaere. I hohoro te whakaaetanga o te OSPF na te mea i mohiotia mo te tatau pono i nga huarahi i roto i nga whatunga rohe nui me te matatini. Hei kawa whakawhiti hononga honohono, kei te pupuri a OSPF i nga papaarangi honohono honohono, he mahere topology whatunga, i runga i ia pouara e whakatinanahia ana. Ko te āhua o tētahi ara i roto i te whatunga te utu, ā, ka whakaaetia e te hātepe OSPF ia pouara ki te tātai i te utu o ngā ara ki tētahi...  Pātai: He aha te ingoa o te pouara honohono e pupuri ana i ngā hononga?
rohe rohe rohe (ABR)