I continually tried theĬommand on the interface, but simply couldn’t get rid of the configuration! At some point, I wanted to disable it and use IPv4 again. We need to forget what we know about configuring IPv4 and approach IPv6 configuration from scratch.įor example, when I first worked with IPv6 on a Cisco device, I had configured an interface to function using IPv6. So, the commands and the functionality have been around for a very long time.įor those that have become intimately familiar with IPv4, changing gears and understanding the logic and philosophy behind IPv6 implementations on Cisco routers can be somewhat difficult. In this article, we’ll take a look at various idiosyncrasies of the IPv6 configuration on Cisco IOS layer 3 equipment, to gain a deeper understanding of how it behaves on such devices.īasic IPv6 functionalities were introduced in Cisco IOS version 12.2(2)T, which was actually released in January of 2003. This is also the case for IPv6 enabled Cisco routers and layer 3 switches. Among the difficulties involved is how particular vendors implement and activate the protocol on their equipment and how IPv6 enabled interfaces subsequently behave. Indeed, you’ve probably become so proficient with IPv4 that you can do subnetting in your sleep!īut IPv6 is so different that it can be disconcerting to some. Even the most seasoned network professionals may find it confusing, especially since most of us have been “brought up” on IPv4. IPv6 is a new beast that can be intimidating at times.
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