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IPv6 Training (Cisco): Enabling IS-IS for IPv6 on a Cisco Router 

Added: 09/02/2008, Hits: 3,873, Rating: 0, Comments: 0, Votes: 0
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In the past few weeks, a lot of you have been emailing me asking ďwhy donít you write an article explaining how to enable the IS-IS protocol on a Cisco routerís interface?Ē

Well, for all of you emailerís 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 routerís 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.

Below are the steps that youíll 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

Steps Explained:

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).

I invite you to visit my website at where youíll find the latest information regarding Cisco IPv6 Design and Implementation Techniques. And, also learn more about the new "Cisco IPv6 Video Accelerated Training Course" which contains over 3000 videos that will teach you all you need to know about Designing, Building, and Deploying Cisco IPv6 networks. (Guaranteed)

To your success,

Charles Ross
CCNP #CSCO10444244

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