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EIGRP For IPv6 Configuration

On Cisco IOS

EIGRP for IPv6 is one of the most used routing protocol with IPv6. In this example, we will see how to configure EIGRP for IPv6 on Cisco routers.

For our example, we will use the topology below.

Here, simply we have four routers connected serially eachother and two switches and PCs are connected to this routers.

eigrp-for-ipv6-example-topology

As a summary, let’s check waht will we do for EIGRP for IPv6 configuration:

1. Global IPv6 Enable on Routers
2. EIGRP for IPv6 Process Creation
3. Router-ID Assign
4. EIGRP Process addition under Interfaces
5. Passive interface configuraiton
6. Verification

Let’s see each of this EIGRP for IPv6 configuration example one by one.

First of all we enable IPv6 routing on all routers. Because, by default ipv6 routing is not enabled.

Router A # config terminal
Router A (config) # ipv6 unicast-routing

Router B # config terminal
Router B (config) # ipv6 unicast-routing

Router C # config terminal
Router C (config) # ipv6 unicast-routing

Router D # config terminal
Router D (config) # ipv6 unicast-routing

After enabling IPv6 routing, it is time to configure EIGRP for IPv6. For this configuration we will use “ipv6 router eigrp -process number-” configuration command. We will create the EIGRP process on the Router. And we will no shutdown this eigrp process.

Under IPv6 eigrp process, we will also configure a router ID. This router ID will be in IPv4 format like the one used in EIGRP before. Here our routing Ids will be 1.1.1.1, 2.2.2.2, 3.3.3.3 and 4.4.4.4 simply.

Router A # config terminal
Router A (config) # ipv6 router eigrp 100
Router A (config-rtr)# no shutdown
Router A (config-rtr)# eigrp router-id 1.1.1.1

Router B # config terminal
Router B (config) # ipv6 router eigrp 100
Router B (config-rtr)# no shutdown
Router B (config-rtr)# eigrp router-id 2.2.2.2

Router C # config terminal
Router C (config) # ipv6 router eigrp 100
Router C (config-rtr)# no shutdown
Router C (config-rtr)# eigrp router-id 3.3.3.3

Router D # config terminal
Router D (config) # ipv6 router eigrp 100
Router D (config-rtr)# no shutdown
Router D (config-rtr)# eigrp router-id 4.4.4.4

Now, we will configure the interfaces as EIGRP for IPv6. Here we will use the command “ipv6 eigrp -process number-” command.

Router A (config) # interface serial 0/0/0
Router A (config-if) # ipv6 eigrp 100
Router A (config-if) # interface serial 0/0/1
Router A (config-if) # ipv6 eigrp 100

Router B (config) # interface serial 0/0/0
Router B (config-if) # ipv6 eigrp 100
Router B (config-if) # interface serial 0/0/1
Router B (config-if) # ipv6 eigrp 100

Router C (config) # interface serial 0/0/0
Router C (config-if) # ipv6 eigrp 100
Router C (config-if) # interface serial 0/0/1
Router C (config-if) # ipv6 eigrp 100

Router D (config) # interface serial 0/0/0
Router D (config-if) # ipv6 eigrp 100
Router D (config-if) # interface serial 0/0/1
Router D (config-if) # ipv6 eigrp 100

By the way, in this configuration we assumed that ipv6 address configurations has done. So, here we did not show you the ipv6 address configuration. As you remember IPv6 configuraion is done under the interface by using, “ipv6 enable” command and “ipv6 adress –ipv6address-” command.

After this interface configurations, our interfaces are up and EIGRP neighbourships are established. Here, we will do one more configuration. It is the “passive interface” configuration.

Passive interfaces are used for the ports that are not need EIGRP updates . If one port is configured as passive, it does not advertise EIGRP routes and does not receive any updates. This is generally used for non router ports. Ports that are connected to switches or host devices like PCs etc..

In our topology, we will configure the ports on routers towards the switches as passive interfaces. We will configure only Router C and Router D. Because only they have these switch interfaces.

And we will do this configuration under EIGRP for IPv6 process.

Router C (config) # ipv6 router eigrp 100
Router C (config-rtr)# passive-interface Gi 0/0

Router D (config) # ipv6 router eigrp 100
Router D (config-rtr)# passive-interface Gi 0/0

After all these configurations, it is time to verification of our EIGRP of IPv6 configuration example. You can use the below commands on all the routers and check the EIGRP neighbours, protocols, interfaces under show ipv6 protocols, eigrp routes and more.

Router A # show ipv6 eigrp neighbor
Router A # show ipv6 eigrp topology
Router A # show ipv6 protocols
Router A # show ipv6 route

Router B # show ipv6 eigrp neighbor
Router B # show ipv6 eigrp topology
Router B # show ipv6 protocols
Router B # show ipv6 route

Router C # show ipv6 eigrp neighbor
Router C # show ipv6 eigrp topology
Router C # show ipv6 protocols
Router C # show ipv6 route

Router D # show ipv6 eigrp neighbor
Router D # show ipv6 eigrp topology
Router D # show ipv6 protocols
Router D # show ipv6 route

In this article, we tried to show you EIGRP for IPv6 with a configuration example.

IPv6 Routing Protocols…

IPv6 Routing Protocols – Part 1
IPv6 Routing Protocols – Part 2 (OSPFv3)
IPv6 Routing Protocols – Part 3 (EIGRP for IPv6)
IPv6 Routing Protocols – Part 4 (RIPng)
IPv6 Routing Protocols – Part 5 (ISIS for IPv6)

IPv6 Routing Protocols CONFIGURATIONs..!

Static/Default Route Configuration Example On Cisco IOS
OSPFv3 Configuration Example On Cisco IOS
EIGRP for IPv6 Configuration Example On Cisco IOS
RIPng Configuration Example On Cisco IOS
ISIS for IPv6 Configuration Example On Cisco IOS

You can find the other IPv6 articles below…

IPv6

IPv6 – Part 1 (IPv6 and IPv6 Addresses)
IPv6 – Part 2 (What does IPv6 bring?)
IPv6 – Part 3 (Address Types in IPv6)
IPv6 – Part 4 (Subnetting IPv6)

IPv6 Static Route Configuration Examples…

IPv6 Static Route Configuration on Cisco
IPv6 Static Route Configuration on Juniper

IPv4 and IPv6 Headers…

IPv4 and IPv6 Headers

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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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