Cisco IPv6 Training

Enabling IS-IS for IPv6 on a Cisco Router’s Interface

By Charles Ross CCNP #CSCO10444244

In the past few weeks, a lot of you have been emailing me asking “Charles, why don’t you write an article explaining how to enable the IS-IS protocol on a Cisco router’s interface?”

Well, for all of you emailer’s out there and you know who you are; this article is for you!

Now, when configuring the IS-IS protocol for IPv6 on a Cisco router’s interface you will need to perform two tasks. The first task entails creating an IS-IS routing process and the second task entails configuring (enabling) the IS-IS routing process on the specific interface.

Here are the steps that you’ll need to successfully perform task 1 and task 2.

1. Router>enable

2. Router#configure terminal

3. Router(config)#ipv6 unicast-routing

4. Router(config)#router isis area-tag

5. Router(config-router)#net network-entity-title

6. Router(config-router)#exit

7. Router(config)#interface type-number

8. Router(config-if)#ipv6 address {ipv6-address/prefix-length |prefix-name sub-bits/prefix-length}

9. Router(config-if)#ipv6 router isis area-name

10. Router(config-if)#exit

11. Router(config)#exit

12. Router#copy run start

Step #1 

1. Router>enable

Puts router into Privileged EXEC mode.

Step #2  

2. Router#configure terminal

Puts router into Global configuration mode.

Step #3

3. Router(config)#ipv6 unicast-routing

Configures the router to (globally) route IPv6 packets.

Step #4 

4. Router(config)#router isis area 2

Configures (enables) a specific IS-IS routing process, and puts router into router configuration mode.

Step #5 

5. Router(config-router)#net 49.0001.0001.0000.000c.00

Configures an IS-IS network entity title (NET) for the specified routing process. (A NET is used to define the area address for the IS-IS area and the system ID of the router)

Step #6

6. Router(config-router)#exit

Returns the router to Global configuration mode.

Step #7

7. Router(config)#interface fastethernet 0/0

Specifies the fastethernet 0/0 interface on which IS-IS is to be configured and puts router into interface mode.

Step #8

8. Router(config-if)#ipv6 address 2001:0DC8::3/64

Specifies the IPv6 network assigned to the interface and enables IPv6 processing on the interface.

Step #9

9. Router(config-if)#ipv6 router isis area 2

Configures (enables) the specified IPv6 IS-IS routing process on the fastethernet 0/0 interface. 

Step #10

10. Router(config-if)#exit

Returns the router to Global configuration mode.

Step #11

11. Router(config)#exit

Returns the router to Privileged EXEC mode.

Step #12

12. Router#copy run start

Saves the contents of the running-config to local Non -Volatile Random Access Memory (NVRAM).

To your success,

Charles Ross

CCNP #CSCO10444244

www.ciscoipv6ittechtips.com