The default behavior of
router is to perform the equal load balancing to distribute the network
traffic over the available path with same distance from the destination.
You can increase the performance of your network using the load
balancing techniques.
You
can perform load balancing using two methods:
All routing protocol
like (RIP, RIP v2, IGRP, EIGRP & OSPF) support equal cost load balancing
but IGRP and EIGRP support unequal cost load balancing also. In today
tip we will try to perform unequal cost load balancing using EIGRP
protocols.
Follow the network topology of three different class networks. There are
two parallel links between router A & B with bandwidth 256 & 512.
Configuration to Enable EIGRP on Router A
In global configuration Mode:
A (config)# router eigrp 20
(Enable EIGRP protocol and 20 is Autonomous number).
A (config-router)# network 40.0.0.0
(Advertised router A Serial Network 40.0.0.0)
A (config-router)# network 50.0.0.0
(Advertised router A Serial Network 50.0.0.0)
A (config-router)# network 210.100.10.0
(Advertised router A Ethernet Network 210.100.10.0)
Configuration to Enable EIGRP on Router B
In global configuration Mode:
B (config) # router eigrp 20
(Enable EIGRP protocol and 20 is Autonomous number)
B (config-router) # network 40.0.0.0
(Advertised router B Serial Network 40.0.0.0)
B (config-router) # network 50.0.0.0
(Advertised router B Serial Network 50.0.0.0)
B (config-router) # network 61.0.0.0
(Advertised router B Serial Network 61.0.0.0)
B (config-router) # network 210.100.20.0
(Advertised router B Ethernet Network 210.100.20.0)
Now the metric value of router B through S0 42112/8676 =4.85 is
greater than the metric value of S1 route. Here configure the
Variance value 5 on router B to include the second route in routing
table. To calculate the variance value, run the command
B #show ip eigrp topology
B (config-router) #variance 5
B (config-router) #exit
Now verify the both routes in router B routing table, run the
command
B #show ip route
Configuration to Enable EIGRP on Router C
In global configuration Mode:
C (config)# router eigrp 20
(Enable EIGRP protocol and 20 is Autonomous number)
C (config-router)# network 61.0.0.0
(Advertised router C Serial Network 61.0.0.0)
C (config-router)# network 210.100.30.0
(Advertised router C Ethernet Network 210.100.30.0)
COMPUTER TIPS