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11. OSPF ON BROADCAST MULTIACCESS

HOW TO OSPF ON BROADCAST MULTIACCESS CONFIGURATION
 
Interface IP Address Configuration  
  
R1  
  
Interface   IP Address    Subnet Mask  
Fa0/0        10.1.1.1          255.0.0.0  
  
R2  
  
Interface   IP Address   Subnet Mask  
E0              20.1.1.1        255.0.0.0  
  
R3 
 
  
Interface  IP Address    Subnet Mask  
E0            30.1.1.1          255.0.0.0 
 
 
Task   
  
Configure OSPF as per the above scenario.  
  
R1                                                                 
                                                                   
Router ospf 1                                                      
Network 10.0.0.0 0.255.255.255 area 0                              
 
R2
 
Router ospf 1
Network 20.0.0.0 0.255.255.255 area 0
 
R3  
  
Router ospf 1  
Network 30.0.0.0 0.255.255.255 area 0  
  
 
Verification :  
  
The DR & BDR election can be verified by using the following commands  
  
R2#show ip ospf neighbor  
  
R3#show ip ospf interface   
  
      •     Routers notify DR on 224.0.0.6  
      •     DR notifies others on 224.0.0.5.  
      •     Router with highest priority value is the DR  
      •     Router with second highest priority value is BDR  
      •     Default for interface OSPF priority is 1  
      •     In case of a tie, router-id (highest) is preferred  
      •     A router with priority set to 0 cannot become the DR/BDR and is called DR other  
      •     DR election is non-preemptive   
  
Setting priority for DR election   
  
(config-if) # ip ospf priority number  
                                    -Default is 1  
                                    -Range is 0-255.
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