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Other EIGRP Properties



In EIGRP Operation there are some protocol characteristics that helps you better implementation. These characteristics are mentioned below.

Route Summarization



By default EIGRP summarizes the classfull addresses. So generally “no auto-summary” command is used to avoid this situation.

Router (config) # router eigrp 100
Router (config-router) # no auto-summary

Summary routes can also be produced manually. You can use this by “ip summary-address” command.

Router (config) # interface fa0/1
Router (config-if) # ip summary-address eigrp 100  10.0.0.0 255.0.0.0

Passive Interface



If you want to prevent one interface or all interfaces to receive EIGRP update and EIGRP hello packets , you can use “passive interface” command. By using this command, no update and hello packets coem to that interface anymore.
For example, with this command, you can prevent fa0/1 to receive update and hello packets like below.

Router (config) # router eigrp 100
Router (config-router) # passive-interface fa0/1

You can also prevent all the interfaces to receive these packets and then you can open the ones you want. Below, firstly we prevent all interfaces and then allow fa0/5 and fa0/6.

Router (config) # router eigrp 100
Router (config-router) # passive-interface default
Router (config-router) # no passive-interface fa0/5
Router (config-router) # no passive-interface fa0/6

Unicast Neighbours



In EIGRP, multicast address 224.0.0.10 is used . If you want , you can change this to a specific neighbour address with “neighbour ip-address” command. You can use this command like below:

Router (config) # router eigrp 100
Router (config-router) # neighbour 10.0.0.1

EIGRP Stub



EIGRP Stub router is the router that is not a transit router and only has one EIGRP neighborship. EIGRP Stub provides less queries.

Router (config) # router eigrp 100
Router (config-router) # eigrp stub [receive-only, connected , static, summary, redistributed]

After stub command, you can optionally use some parameters. These parameters are receive-only, connected , static, summary, redistributed.

Load Balancing In EIGRP



Load Balancing is the traffic equalization or adjustment on the interfaces towards the destionations. There are two types Load Balancing. These are:

• Equal-Cost Load Balancing
• Unequal-Cost Load Balancing

Equal-Cost Load Balancing is the Load Balancing, that is done when there are equal costs to a destination. By default EIGRP automatically use Equal-Cost Load Balancing and supports up to 4 Equal-Cost routes.

EIGRP Equal Cost Load Balancing

EIGRP Equal Cost Load Balancing

Unequal-Cost Load Balancing is the load balancing, that is done when a traffic to the destination links has different cost or speed. In EIGRP Unequal-Cost Load Balancing is done with the help of “variance” command.

EIGRP Unequal Cost Load Balancing

EIGRP Unequal Cost Load Balancing

Think about the topology above. There are three paths and each of them has different costs. The feasible distance is 5 for the Best Route. Here, if you set variance 2, then 2×5=10. Any cost lower or equal to this varians will be used to send traffic.

Router(config)#  router eigrp 100
Router(config-router) # variance 2

EIGRP Article Series…
EIGRP – Part 1
EIGRP – Part 2 (EIGRP Tables)
EIGRP – Part 3 (EIGRP Packet Types and Neighborship)
EIGRP – Part 4 (Other EIGRP Properties)

EIGRP Configuration with Packet Tracer

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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

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