OSPF timers

• The OSPF timers must be identical to establish adjacencies, for each 2 facing interfaces
• Current OSPF timers can been seen with: sho ip ospf interface
• All routers in area must have the same OSPF timer values

 interface Serial0/1
   ip address 131.108.1.2 255.255.255.0
   ip ospf hello-interval 20
   ip ospf dead-interval 45
   ip ospf retransmit-interval 50