EIGRP Routing protocol

EIGRP(Enhanced Interior Gateway Routing Protocol)

Advanced Distance vector protocol
Earlier Cisco proprietary- But now it has become open standard, this might be the one of the reason most of the routers are configured with OSPF protocols.
Uses Dual (Diffusion Update Algorithm) Best path and second best path.
Classless routing protocol
Updates are sent through multicast IP address 224.0.0.10
Incremental updates -sends only partial change or update in the data instead of sending entire protocol.
Administrative distance is 90
Metric(32-bit): Composite metric
  • Bandwidth, delay, load, reliability and MTU
  • Bandwidth and delay is used by default
Maximum hop count supported is 224(default is 100)
Hello packets are sent every 5 secs
Supports IP, IPX and Apple Talk protocols
Support 4 path load balancing (maximum 16 equal or unequal paths)
Convergence rate is fastest
Dead timer is 15 sec

  EIGRP Tables:

Neighbor Table:

Contains information about directly connected neighbors

Topology Table:

Contains entries of all destinations, along with the feasible distance and the advertised distance
  • Contains the successors
  • Contains feasible successor if any

Routing Table:

Entries with the best path for each destination from the topology table are removed into the routing table.

Feasible Distance:

Feasible distance(FD) is the metric of the best route to a destination, including the local link distance.
Feasible distance= advertised distance+local link distance (of the best path)

Advertised Distance:

The distance of a route as advertised by the neighbor. It does not include the local link distance.

Successor:

The neighbor with best distance to the destination.

Feasible Successor:

The neighbor with second best distance to the destination, which meets the criteria advertised distance should be less than the feasible distance.

  1. An autonomous system is a collection of networks or routers under a common administrative policy
  2. Autonomous systems are identified using numbers
  3. Autonomous system number ranges from 1-65535
  • Public: 1-64511
  • Private: 64512-65535
Syntax
Router(config)#router eigrp <AS no>(Autonomous number)
Router(config-router)#network <network id>

To check the neighbor table
Router#show ip eigrp neighbor

To check topology table of eigrp
Router#show ip eigrp topology

Video available on below link

http://youtu.be/SqLDVTEJav0

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