EIGRP - Authentication - Summarization - Unicast Update - Default Route Summary Address

EIGRP - Authentication
In EIGRP, there is only MD5 Authenication, no clear text authentication. So, here are the configuration :

EIGRP - Summarization

Summarization makes several route become only one summary. We have to advertise some ip loopback in R3 then summarized it. As it shown in R1, its already summarized as 10.0.0.0/29.

Add configuration below, in interface fa0/0 R3, but you must calculate its advertise prefix :

• R3(config-id)#ip summary-address eigrp 1 10.0.0.0 255.255.255.248

EIGRP - Unicast Update

By default EIGRP use its multicast 224.0.0.10 to update their routing table. This time we will change to unicast update.

Change to unicast (R1-R2)

• R1(config-router)#neighbour 12.12.12.2 s0/0

Change to unicast (R2-R1)

• R2(config-router)#neighbour 12.12.12.1 s0/0

You could check its update by activate "debug ip packet detail" on each router. Make sure its update already change from 224.0.0.10 to its neighbour.

• R1(config)#debug ip packet detail

EIGRP - Default Route - Summary Address

Default route can be configure and redistributed through EIGRP, so each router no need to configure default route one by one.

Configure text below into interface s0/0 (Configure into interface which define as Router core):

• R1(config-router)#int s0/0
• R1(config-if)#ip summary-address eigrp 1 0.0.0.0 0.0.0.0