TAILIEUCHUNG - OSPF Design Guide

In the above diagram, routers on the same segment go through a series of states before forming a successful adjacency. The neighbor and DR election are done via the Hello protocol. Whenever a router sees itself in his neighbor's Hello packet, the state transitions to "2-Way". At that point DR and BDR election is performed on multi-access segments. A router continues forming an adjacency with a neighbor if either of the two routers is a DR or BDR or they are connected via a point-to-point or virtual link | Cisco - OSPF Design Guide oiut 4n T Prộduộtỉ T ûrd E r i n Tech Nates Partners T T r ai flirt t OSPF Design Guide Contents Appendix A Link-State Database Synchronization Link-State Advertisements OSPF Database Example Appendix B OSPF and IP Multicast Addressing Appendix C Variable Length Subnet Masks VLSM Appendix A Link-State Database Synchronization TWO-WAY Attempt on Seïial lines ti case neirhboi Exstart MarterZSJave lỉlliìlìì DOWN nn ị KIB Helo DR 0 None Seen D0WN INIT Hello DR R1 R2 and R3 Seen DD Seq y M DD Seq x M DD Seq x S DD Seq x 1 M Exchange DD Seq x l S DD Seq x n M DD Seq x n S Link State Requset Loading http warp public 104 1 of 20 5 6 2001 3 55 45 PM Cisco - OSPF Design Guide Loading Linik State Requset Link State Update FULL Link St ate Requset Link State Update FULL In the above diagram routers on the same segment go through a series of states before forming a successful adjacency. The neighbor and DR election are done via the Hello protocol. Whenever a router sees itself in his neighbor s Hello packet the state transitions to 2-Way . At that point DR and BDR election is performed on multi-access segments. A router continues forming an adjacency with a neighbor if either of the two routers is a DR or BDR or they are connected via a point-to-point or virtual link. In the Exstart state the two neighbors form a Master Slave relationship where they agree on a initial sequence number. The sequence number is used to detect old or duplicate Link-State Advertisements LSA . In the Exchange state Database Description Packets DD will get exchanged. These are abbreviated link-state advertisements in the form of link-state headers. The header supplies enough information to identify a link. The master node sends DD packets which are acknowledged with DD packets from the slave node. All adjacencies in exchange state or greater are used by the flooding procedure. These adjacencies are fully capable of transmitting and receiving all types of .

• Quản trị mạng
• công nghệ thông tin
• tin học
• mạng
• internet
• web
• quản trị mạng
• Dự thảo về Công nghệ thông tin
• Phát triển Công nghệ thông tin
• Ngành công nghiệp công nghệ thông tin
• Mục tiêu phát triển công nghệ thông tin
• Luật công nghệ thông tin
• Quản trị dự án công nghệ thông tin
• Ý tưởng dự án công nghệ thông tin
• Hoạch đinh chiến lược
• Tổ chức dự án
• Quản trị dự án công nghệ thông tin
• Lập kế hoạch dự án
• Quy trình quản lý dự án
• Ứng dụng công nghệ thông tin
• Công nghệ thông tin trong dạy tin học
• Thiết kế bài giảng điện tử
• Kỹ thuật chèn hình
• Kỹ thuật tạo hiệu ứng
• Cách làm slide thuyết trình
• Hiệu ứng Powerpoint
• quản trị mạngcông nghệ thông tin