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5. LOAD BALANCING ACROSS UNEQUAL COST PATH

HOW TO LOAD BALANCING ACROSS UNEQUAL COST PATH
 
Interface IP Address Configuration  
  
R2  
  
Interface  IP Address   Subnet Mask  
S 0            2.2.2.1          255.0.0.0  
S 1            1.1.1.1          255.0.0.0  
E 0            20.1.1.1        255.0.0.0  
  
R3 
 
  
Interface   IP Address     Subnet Mask  
S 1             1.1.1.2            255.0.0.0  
S0              2.2.2.2            255.0.0.0  
E 0             30.1.1.1         255.0.0.0  
  
  
Task 1  
  
Configure EIGRP AS 100 as per the above scenario. Make the links unequal cost paths  
using the bandwidth command in interface mode and verify load balancing.
 
Use the variance command to gain load balancing   
  
R1                           
 
Router eigrp 100               
Network 20.0.0.0              
Network 1.0.0.0                
Network 2.0.0.0                
No auto-summary               
                              
                             
R2  
 
Router eigrp 100
Network 1.0.0.0 
Network 30.0.0.0
Network 2.0.0.0
Variance 2 
No auto-summary 
Interface S 0  
Bandwidth 800 
 
 
The variance multiplier set in the variance command when multiplied by the successor  
FD, must be greater than the feasible successor FD. Thus the feasible successors whose  
FD is less than the above calculated value are installed in the routing table.
 
Verification:  
  
With out the variance command:  
  
R2#sh ip eigrp topology  
  
The output displays 2 routes installed in the topology table with 2 different costs.   
  
R2#show ip route  
  
With the variance command:  
  
R2#show ip route  
 
The output displays 2 routes installed in the routing table.
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