IPv6 - No SLAAC on MS SVIs?

[Lurick]

I just recently converted a 9300 over to Cloud Managed mode and setup dual-stack SVIs however after assigning IPv6 addresses to the SVIs I noticed that none of the clients get SLAAC addresses and I can't seem to find anything in the GUI to indicate what I might be missing or why none of the clients are picking up IPv6 addresses. If I statically configure an IPv6 address I can hit the gateway and even get out to the internet but I'm a bit confused since I figured SLAAC would be default behavior by now in 17.15.3 in cloud mode.

[alemabrahao]

I'm pretty sure it's not supported, so in your case consider hybrid mode or traditional IOS XE if SLAAC is critical for your deployment.

Hybrid Operating Mode for Catalyst Cloud-Managed Switches - Overview - Cisco Meraki Documentation

[Lurick]

Well it's definitely supported but for some reason all IPV6 RAs are being blocked. When I check the running config via the cloud CLI it shows under each SVI: 

ipv6 enable
ipv6 nd ra suppress all

IPv6 RA Guard used to be an option in the old GUI but now it appears to be missing and I can't figure out how to get it back and I suspect that for some reason it's set to enabled but without the toggle I can't permit it which would get SLAAC working again.

In the interim I've opened a support case, hopefully it's an easy fix 🙂

[alemabrahao]

I got it, do you have any policy under "RA Guard"?

[Lurick]

Well that's where I found something fun 🙂

Apparently the dashboard is directing me to a URL with DHCP-Servers instead of the OTHER page which has DHCPv6 and RA Guard settings. I managed to stumble upon that going between different networks. Unfortunately that didn't solve it setting to allow all RA but I did add some details to the support case to get more info so I'm hopeful

[bperezgo]

Hi @Lurick, 

Here is a list of unsupported IPv6 features on IOS XE 17.15.3: https://documentation.meraki.com/MS/Cloud-Native_IOS_XE/Cloud-Native_IOS_XE_Overview#Unsupported_fea...

Cheers,

[Lurick]

Thanks! I would expect SLAAC to be on there then based on my experience so far but definitely helpful and does explain the difference in landing pages between networks I've seen 🙂