Cisco CCNA and CCNP

Chapter:
OSPF

OSPF xususiyatlari
Classless-OSPFv2 CIDR va VLSM ni qo’lab quvatlaydi
Efficient – eng yaxshi yolni talash uchun SPF algaritmdan foydalanadi
Fast convergence -Tarmoq o’zgarishini tez tarqatadi
Scalable-kichik va katta tarmoqlarda yaxshi ishlaydi
Secure-MD5 va Secure Hash Algorithm (SHA)
Administrative distance (AD)-110
Multicast address – 224.0.0.5 va 224.0.0.6
Algoritim - Djikstra

OSPF komponentlari
OSPF uchta ma'lumotlar bazasini yaratadi va yuritadi
Adjacency database -qo'shnilik jadvalni yaratadi.
Link-state database (LSDB) -topologiya jadvalini yaratadi.
Forwarding database – Router jadvalini yaratadi

OSPF komponentlari
Link-State Operation

OSPF komponentlari
Link-State Operation

OSPF komponentlari
Link-State Operation

OSPF komponentlari
Link-State Operation

OSPF komponentlari
Link-State Operation

Single-Area and Multiarea OSPF
.

Types of OSPF Packets
Hello packet – Qo’shnilikni o’rnatish
Database Description (DBD) – LSDB ni tashlaydi va o’rganadi
Link-State Request (LSR) – DBD haqida qo’shimcha malumot so’raydi
Link-State Update (LSU) – LSR ga javob berish va yangilanishlarni yuboradi LSU ni 11 ta turi mavjud
Link-State Acknowledgment (LSAck) – LSU paketlariga javob paket

Hello Packet
Multicast address 224.0.0.5 ipv6 FF02::5
Router-id
Hello time
Died time
Area-id
Ip address va maska
DR va BDR adresslar
Qo’shnilar ro’yxari
Router Priority

Salom Paket intervallari
point-to-point networks – 10 sec
non-broadcast multiple access [NBMA] networks; for example, Frame Relay – 30 sec
Died time = 4 x hello

OSPF operatsion holatlari
Down state – hello jo’natadi
Init state – Helloni yetib borganiga ishonch hosil qiladi
Two-Way state – Qo’shni bo’ladi
ExStart state – DBD bazasini jonatadi
Exchange state – DBD larni almashadi
Loading state – o’ziga kerakli LSU , LSR larni so’raydi
Full state - tayor