3650 - disable ipv6

[Daniel Flieth]

Hello, our customer changed his old HP Switches to new cisco Switches. Now with his old wireless lan Controller and APs he has some issues with 802.1X authentication.

In the Wireless Controller we see now IPv6 Adresses. THis is the only difference to the old situation.

Now we would like to disable ipv6 on this Switches. Is this possible?

[Julio E. Moisa]

Hi Daniel,

In order to enable IPv6 on the switches you must change the SDM Template:

sdm prefer dual-ipv4-and-ipv6 default

Now if you want to disable it totally, you can change the SDM template to default or other template, I suggest verify your current template first using the following command:

show sdm prefer

If you are using: sdm prefer dual-ipv4-and-ipv6 default, you could change it by other template listed.

sdm prefer <other sdm>

Then restart the switch to take effect. 

* I suggest verify before which sdm template is better for the daily tasks executed on the switch, if it will be used for layer 2, layer 3 only, etc. 

Now in order to remove the routing, you could execute no ipv6 unicast-routing, the following link could be useful:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/ipv6/configuration_guide/b_ipv6_3se_3650_cg/b_ipv6_3se_3650_cg_chapter_0100.html#task_1059828

Hope it is useful

:-)

[Daniel Flieth]

Thank you very much Julio, i will try this tomorrow at customer site.

[Julio E. Moisa]

Hi Daniel,

You are welcome,

I always suggest get a back up of the configuration for any situation. 

Have a great weekend.

:-)