After neighbor relationship is set up utilizing the Hello packet, trade of routing updates happens between neighbors. Data about the system is put away in the topology database or table from which the best way to each goal is processed and put away in the routing table. At the point when the topology databases for all neighbor routers will be synchronized, the neighbors turn out to be completely adjacent. To guarantee that neighbor relationship is kept up and the substance of the topology tables are accurate and up– to– date, a switch should occasionally send the Hello bundle. This empowers all getting router to keep the transmitting router and its systems in their topology tables for whatever length of time that they keep on receiving the Hello packet. adjacent isn’t built up between all neighbors. adjacency arrangement relies upon a system write and how the router are designed in the network. OSPFv3 sets up adjacency utilizing three unique packet. These are database portrayal (DBD), link state ask for (LSR), and link state refresh (LSU) packet. The DBD bundle contains just LSA headers from the neighbor’s link– state database. At the point when these LSA headers are gotten by a neighborhood router, it looks at them to its own link– state database header to figure out which LSAs are new or which ones are up– to– date. On the off chance that a portion of the LSAs should be refreshed, the nearby router sends LSR packet to its neighbors approaching them to give refresh data to these LSAs. At the point when the neighbors get the LSR packet, they answer with a LSU packet in which they give refresh data to the LSAs. The router proceed with this trade until the point that they all have indistinguishable link– state data. OSPF neighbor relationship and adjacency are key highlights and feature of the protocol since the neighbor of a router gathers data about the network and advances this data to different neighbors straightforwardly associated with it. Additionally, the making of the two connections between router is utilized to control the appropriation of OSPF bundles making the system to focalize quicker (Leahy, 2011).