CCNA Class 16: EIGRP Concept and Configurations

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 What is the EIGRP

EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco proprietary protocol, it uses a combination of distance-vector and link-state routing protocols. This technically makes EIGRP an advanced distance-vector protocol or a hybrid protocol.

Administrative Distance for EIGRP are: -

EIGRP Routes

AD Values

Summary Routes

5

Internal Routes

90

External Routes

170


Some messages to communicate with the neighbour devices that operate EIGRP. These are:

  1. Hello messages,  Used for neighbor discovery and maintaining adjacencies.

  2. Update messages, Contain routing information sent to neighbors.

  3. Query Messages, Sent when a router needs additional information about a destination.

  4. Reply Messages, Sent in response to query packets.

  5. Acknowledgement messages, Confirm the receipt of reliable packets.

Here Update, Query, and Reply messages contain RTP - Reliable Transport Protocol.

EIGRP Update and Discovery Process - 


EIGRP Simplified the Formula, 

Here, 

Cumulative Delay means, the number of hops might be counted while traversing data packet source to destination. By default, the Serial Link is 20,000ms and the Fastethernet Link is 100ms.


EIGRP Timers -

  1. Hello Interval: Frequency at which Hello packets are sent (default: 5 seconds on most networks).

  2. Hold Timer: Time a router will wait without receiving Hello packets before declaring a neighbor down (default: 15 seconds).


EIGRP CONFIGURATION

Topology: -

Fig: EIGRP Configuration Diagram

Addressing Table: -

Device

Interface

IP Address

Subnet Mask

Default Gateway

B_R1

Se0/0/0

1.2.3.1

255.255.255.252

N/A

Se0/0/1

1.2.3.5

255.255.255.252

N/A

Gi0/0

192.192.100.1

255.255.255.0

N/A

B_R2

Se0/0/0

1.2.3.2

255.255.255.252

N/A

Se0/0/1

1.2.3.9

255.255.255.252

N/A

Gi0/0

10.1.1.1

255.255.255.0

N/A

B_R3

Se0/0/0

1.2.3.6

255.255.255.252

N/A

Se0/0/1

1.2.3.10

255.255.255.252

N/A

Gi0/0

172.16.100.1

255.255.255.0

N/A

PC1

Fa0

192.192.100.10

255.255.255.0

192.192.100.1

PC2

Fa0

10.1.1.10

255.255.255.0

10.1.1.1

PC3

Fa0

172.16.100.10

255.255.255.0

172.16.100.1


Part 1: EIGRP Configuration

B_R1(config)#router eigrp 10 (Autonomous System Number)

B_R1(config-router)#network 192.192.100.0 0.0.0.255

B_R1(config-router)#network 1.2.3.0 0.0.0.3 

B_R1(config-router)#network 1.2.3.4 0.0.0.3

B_R1(config-router)#passive-interface gi0/0

B_R1(config-router)#no auto-summary


B_R2(config)#router eigrp 10

B_R2(config-router)#network 10.1.1.0 0.0.0.255

B_R2(config-router)#network 1.2.3.0 0.0.0.3

B_R2(config-router)#network 1.2.3.8 0.0.0.3

B_R2(config-router)#passive-interface gigabitEthernet 0/0

B_R2(config-router)#no auto-summary 


B_R3(config)#router eigrp 10

B_R3(config-router)#network 1.2.3.8 0.0.0.3

B_R3(config-router)#network 1.2.3.4 0.0.0.3

B_R3(config-router)#network 172.16.100.0 0.0.0.255

B_R3(config-router)#passive-interface gi0/0

B_R3(config-router)#no auto-summary 


Part 2: Verify EIGRP Routing

B_R1#show ip eigrp neighbors 10

B_R2#show ip eigrp neighbors 10

B_R3#show ip eigrp neighbors 10


B_R1#show ip protocols

B_R2#show ip protocols 

B_R3#show ip protocols 


B_R1#show ip eigrp traffic 10

B_R1#show ip eigrp topology 

B_R1#show ip eigrp interfaces


Part 3: Testing from the PCs

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