OSPFv3 Configuration Example on Cisco IOS

OSPFv3 Cisco Configuration

OSPFv3 is the IPv6 cabaple version of OSPF. The previous version of OSPF was OSPFv2. OSPFv2 is for IPv4.

Here, we will configure OSPFv3 for the below topology. As you can see, there are three areas and six routers in this topology.

For OSPFv3 Configuration, we will follow the below steps one by one:

1. Enabling Global IPv6 Routing
2. Enabling Interfaces for IPv6
3. IPv6 Address Configuration
4. Configuring OSPFv3 Process
5. Router ID Configuration
6. Adding Interfaces to OSPFv3 Process and Areas
7. Clear ipv6 ospf process
8. Verification

Now, let’s go to each COnfiguration steps one by one.

Enabling Global IPv6 Routing

Firstly, we will enable global IPv6 Routing on each Router with “ipv6 unicast-routing” command.

Router 1 # config terminal
Router 1 (config) # ipv6 unicast-routing

Router 2 # config terminal
Router 2 (config) # ipv6 unicast-routing

Router 3 # config terminal
Router 3 (config) # ipv6 unicast-routing

Router 4 # config terminal
Router 4 (config) # ipv6 unicast-routing

Router 5 # config terminal
Router 5 (config) # ipv6 unicast-routing

Router 6 # config terminal
Router 6 (config) # ipv6 unicast-routing

Enabling Interfaces for IPv6

Secondly, we will enable IPv6 under interfaces with “ipv6 enable” command.

Router 1 (config) # interface fa0/0
Router 1 (config-if) # ipv6 enable
Router 1 (config-if) # interface fa0/1
Router 1 (config-if) # ipv6 enable
Router 1 (config-if) # interface fa0/1
Router 1 (config-if) # ipv6 enable

Router 2 (config) # interface fa0/0
Router 2 (config-if) # ipv6 enable
Router 2 (config-if) # interface fa0/1
Router 2 (config-if) # ipv6 enable

Router 3 (config) # interface fa0/0
Router 3 (config-if) # ipv6 enable
Router 3 (config-if) # interface fa0/1
Router 3 (config-if) # ipv6 enable
Router 3 (config-if) # interface fa0/1
Router 3 (config-if) # ipv6 enable

Router 4 (config) # interface fa0/0
Router 4 (config-if) # ipv6 enable
Router 4 (config-if) # interface fa0/1
Router 4 (config-if) # ipv6 enable

Router 5 (config) # interface fa0/0
Router 5 (config-if) # ipv6 enable

Router 6 (config) # interface fa0/0
Router 6 (config-if) # ipv6 enable

IPv6 Address Configuration

In the third step, we will do the IPv6 address configuration. We will use “ipv6 address -ipv6address- eui-64“ commands. The Link-local addresses required for neighbourship, will produce Link-local addresses with this command.

Router 1 (config) # interface fa0/0
Router 1 (config-if) # ipv6 address 2001:1234:0:111::1/64 eui-64
Router 1 (config-if) # interface fa0/1
Router 1 (config-if) # ipv6 address 2001:1234:0:222::1/64 eui-64
Router 1 (config-if) # interface fa0/1
Router 1 (config-if) # ipv6 address 2001:1234:0:555::1/64 eui-64

Router 2 (config) # interface fa0/0
Router 2 (config-if) # ipv6 address 2001:1234:0:111::2/64 eui-64
Router 2 (config-if) # interface fa0/1
Router 2 (config-if) # ipv6 address 2001:1234:0:333::1/64 eui-64

Router 3 (config) # interface fa0/0
Router 3 (config-if) # ipv6 address 2001:1234:0:444::2/64 eui-64
Router 3 (config-if) # interface fa0/1
Router 3 (config-if) # ipv6 address 2001:1234:0:333::2/64 eui-64
Router 3 (config-if) # interface fa0/1
Router 3 (config-if) # ipv6 address 2001:1234:0:666::1/64 eui-64

Router 4 (config) # interface fa0/0
Router 4 (config-if) # ipv6 address 2001:1234:0:444::1/64 eui-64
Router 4 (config-if) # interface fa0/1
Router 4 (config-if) # ipv6 address 2001:1234:0:222::2/64 eui-64

Router 5 (config) # interface fa0/0
Router 5 (config-if) # ipv6 address 2001:1234:0:555::2/64 eui-64

Router 6 (config) # interface fa0/0
Router 6 (config-if) # ipv6 address 2001:1234:0:666::2/64 eui-64

Configuring OSPFv3 Process

Router ID Configuration

Now, it is time to configure OSPFv3 process under each router. We will use the process number 1 here. Beside, we will configure a router ID in IPv4 format. Because for both OSPv2 and OSPv3, Router ID is in IPv4 format.

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