CCNA 3 - Capitulo 2.1

CCNA 3 - Capitulo 2.1

1. SINGLE AREA OSPFv2 CONFIGURATION

   • POINT TO POINT OSPF NETWORKS
     • THE WILDCARD
       • WHATS IS WILCARD ?
         • THE INVERSE OF THE SUBNET MASK CONFIGURED ON THAT INTERFACE
       • CALCULATING A WILDCARD MASK FOR CIDR 24
         • SUBTRACT THE SUBNET MASK 255.255.255.255 - 255.255.255.0
           • WILDCARD MASK IS 000.000.000.255
       • CALCULATING A WILDCARD MASK FOR CIDR 26
         • SUBTRACT TH SUBNET MASK 255.255.255.255 - 255.255.255.192
           • WILDCARD MASK IS 000.000.000.063
       • IN A SUBNET MASK A COMMOM IS BINARY 1 IS EQUAL TRUE AND 0 IS FALSE
         • IN A WILCARD MASK, THE INVERSE IS TRUE , LOOK
           • WILDCARD MASK bit 0
             • MATCH
           • WILDCARD MASK bit 1
             • IGNORES
     • THE NETWORK COMMAND SYNTAXE
       • 1) MODE ROUTER OSPF
         • SPECIFY THE INTERFACES
         • TWO WAYS THE INTERFACE THAT WILL PARTICIPATE IN OSPFv2 ROUTING PROCESS
           • FIRST EXAMPLE
             • 1. R1(CONFIG)#ROUTER OSPF 10
             • 2. R1(CONFIG-ROUTER)# NETWORK 10.10.1.0 0.0.0.255 AREA 0
             • 3. R1(CONFIG-ROUTER)# NETWORK 10.1.1.4 0.0.0.3 AREA 0
             • WILDCARD MASK IDENTIFIES INTERFACE BASED ON THE NETWORK ADDRESS
           • SECOND EXAMPLE
             • SPECIFY THE EXACT INTERFACE IPV4 USING A QUAD ZERO WILDCARD MASK
             • 1. R1(CONFIG)#ROUTER OSPF 10
             • 2. R1(CONFIG-ROUTER)# NETWORK 10.10.1.0 0.0.0.0 AREA 0
             • 3. R1(CONFIG-ROUTER)# NETWORK 10.1.1.4 0.0.0.0 AREA 0
             • ADVANTAGE ? WILDCARD IS NOT NECESSARY
         • SINTAX COMMAND
           • 3. R1(CONFIG-ROUTER)#NETWORK-ADDRESS (WILDCARD-MASK) (AREA) AREA-ID
             • network-address wildcard-mask sintax
               • ENABLE OSPF ON INTERFACES
               • ENABLED TO SEND AND RECEIVE OSPF PACKETS
             • area-id sintax
               • MUST BE CONFIGURED WITH THE SAME AREA ID VALUE ON ALL ROUTERS
                 • BEST PRACTICE
                   • TO USE AREA ID 0 , IT EASIER IF THE NETWORK IS LATER ALTERED TO SUPPORT MULTIAREA OSPFv2
       • 2) MODE INTERFACE OSPF
         • OSPF DIRETLY ON THE INTERFACE
         • SINTAX COMMAND
           • R1(CONFIG-IF)# IP OSPF (PROCESS-ID) (AREA-ID)
             • R1(CONFIG)#INTERFACE GIGABITETHERNET 0/0/0
             • R1(CONFIG-IF)# IP OSPF 10 AREA 0
         • EXAMPLE CONFIGURATION
           • 1. R1(CONFIG)# INTERFACE GIG 0/0/0
           • 1.1 R1(CONFIG-IF)#IP OSPF 10 AREA 0
           • 2. R1(CONFIG)# INTERFACE LOOPBACK 0
           • 2.1 R1(CONFIG-IF)# IP OSPF 10 AREA 0
       • DETERMINE WHICH INTERFACES PARTICIPATE IN THE RUNNING PROCESS FOR AN OSPFv2 AREA
     • ONE TYPE OF NETWORK CLASSIFIED BY OSPF IS A POINT TO POINT NETWORK
     • YOU CAN SPECIFY THE NETWORK