Ccna 00-301, Volume Official

network and

ip ospf Commands

Discover 

with Hello

Flood LSAs

SPF Calculation

Config

Enabled

Interfaces

RIB

LSDB

Neighbors

show running-config

show ip protocols

show ip ospf interface

show ip ospf interface 

type number

show ip ospf interface brief

show ip ospf neighbor

show ip ospf neighbor 

type number

show ip ospf database

show ip ospf rib

Admin Distance

Routes

show ip route

show ip route ospf

show ip route 

subnet mask

show ip route | section 

subnet

Figure 20-3

  OSPF Verification Commands

Example 20-4

  OSPF Neighbors on Router R1 from Figure 20-2

R1# show ip ospf neighbor

Neighbor ID     Pri   State          Dead Time   Address       Interface

2.2.2.2           1   FULL/DR        00:00:37    10.1.12.2     GigabitEthernet0/0/0

3.3.3.3           1   FULL/DR        00:00:37    10.1.13.3     GigabitEthernet0/1/0

4.4.4.4           1   FULL/BDR       00:00:34    10.1.14.4     GigabitEthernet0/2/0

The detail in the output mentions several important facts, and for most people, working right 

to left works best in this case. For example, look at the headings:

Interface: This is the local router’s interface connected to the neighbor. For example, the 

first neighbor in the list is reachable through R1’s G0/0/0 interface.