EIGRP(Enhanced Interior Gateway Routing Protocol)

 EIGRP DYNAMIC ROUTING:-   

                                                           
EIGRP stand for Enhanced Interior Gateway Routing Protocol.

 1. Cisco proprietary protocol .

2.   EIGRP is a classless, enhanced distance vector protocol that gives us a real edge over another Cisco proprietary protocol.

 

3.   EIGRP is sometimes referred to as a hybrid routing protocol because it has characteristics of both distance-vector and link-state protocols.

4.   EIGRP use 224.0.0.10 multicasts address to communicate with each other.

 

5.  Maximum hop count 255

 

6.  Maximum hop limit by default 100 ..

 

7 .Administrative distance value is 90 . class="auto-style8">Eigrp port no. is 88.

8. Load balance – 4 by default.

 

9. Maximum path = 16 .

 

10. Neighbor ship is created by hello message.

 

 11. Hello time interval in LAN-5/sec, hold-down=15/sec, in WAN=60/sec, holddown= 180/sec.

 

EIGRP NEIGHBOR  CONDITIONS:

1.  EIGRP routers are willing to exchange routes with each other, they must become neighbors.  There are 4 conditions that must be met for neighbor ship establishment .
2. Hello or ACK received. .
3. AS(Autonomus number 1-65535) number should match .
4. Identical metrics ( K value must match) .
5. Authentication must match.
EIGRP CONFIGURATION :-
STEP 1 > go to in configuration mode.
and follow as in fig.

         

               yo can code indivisually.
NOTE: For checking  neighbor write:  show ip eigrp 1 neighbor.

EIGRP AUTHENTICATION:

 Now i will learn about how to secure my eigrp routing throw eigrp authentication.

lets start: EIGRP support only md5 / encrypted authentication.

step/cmd 1.key chain vinit

step/cmd 2. key 2.

step/cmd 3.  key string cisco@123.

after these command goto in interface of router. and give cmd.

cmd 1.  ip authentication mode eigrp 100(atonomus number) md5.

cmd 2. ipauthentication ke chain eigrp 100 vinit(key name).

example of code in eigrp routing with fig.

                        

eigrp maintain three tables:-

1.Neighbor Table:It contains list of directly connected to router.

2. Topology Table: It contains list of best path and alternate best path.

3. Routing Table:- it contains only best path of routing.

SOME IMPORTANT TERMS OF EIGRP:-

1. FD(Fessible Distance)"- total distamce between source to destination.

2. Successor :- Best path between source to destination  (lowest fd in successor).

3. Feassible Succesor:- second best path between source to destination.