Enhanced Interior Gateway Routing Protocol (EIGRP)

EIGRP (Enhanced Interior Gateway Routing Protocol)

è      It is a hybrid protocol, which elect the neighbor based of hope count, cost and it also considered best bandwidth.

è      It have administrative distance 90(internal), external 170.

      It use multicast address 224.0.0.10 for send error packet, any troubleshooting issue and full/partial update.

è      It also use DUAL (Diffusing update algorithm) algorithm.

è       It support both FLSM and VLSM routing.

è    It Support maximum 255 hope count. ( by default 100)

è      It use RTP (Reliable transport protocol) for sent update message.

è     It use ASN (autonomous system No.) number for neighbor discovery, if neighbor router have  different  autonomous system no. than it not update in our routing table. We can assign autonomous system no. from 1 to 65535.

 

è     EIGRP enabled command :  ->

1.       Router eigrp <ASN>

2.       Network net-id wc-mask 

è   EIGRP verification command:

1.       Show ip eigrp interface

    List of all eigrp interface on which is eigrp is enabled  ( it find based on network command).

2.       Show ip protocol

List of all routing protocol which is enabled on router and list of neighbor ip address.

3.       Show ip eigrp neighbor

List of all known neighbor which have same as no. . not mismatched.

4.       Show ip eigrp topology

List of all successor and feasible successor path. Donn’t whole topology.

5.       Show ip route

List of all ip routing table with the code of D