Check Connectivity

  ping 12.1.1.2
  ping 13.1.1.2
  ping 14.1.1.2
  ping 10.1.1.0

  ping 13.1.1.0
  ping 14.1.1.0
  ping 10.1.1.0

  ping 12.1.1.0
  ping 13.1.1.0
  ping 14.1.1.0
  ping 10.1.1.0

  ping 12.1.1.0
  ping 13.1.1.0
  ping 14.1.1.0
  ping 10.1.1.0

  ping 10.1.1.0
  ping 12.1.1.0
  ping 13.1.1.0
  ping 14.1.1.0

Pre-requisite: EIGRP Configuration, EIGRP Implementation in Cisco.

EIGRP is a CISCO proprietary protocol for routing. EIGRP calculates the best route to a destination using the metric value it is based on.

1. Link bandwidth
2. Delay

EIGRP selects the shortest path and installs that path in the routing table. If there are multiple paths to the destination with the same administrative distance and a metric value, all the routes are installed in the routing table.

In Equal-cost load balancing, if a router has two or more paths to a destination with equal cost metrics, then the router forwards the packets using all the paths equally. However, the protocol should have an equal administrative distance to the destination when forwarding packets, and in our case the protocol is EIGRP. Using load balancing, the router uses network segments and bandwidth more efficiently.

Cisco IOS Software can balance the load across up to four equal-cost paths by default. We can configure the EIGRP load balancing up to 16 equal-cost paths and a maximum of 32 equal-cost routes in the routing table. The subcommand “maximum-path” in the router configuration mode is used to configure EIGRP maximum paths.

Syntax: 

ROUTER(config-router)#maximum-paths <1-32>