Hi,

Is it working with them both being the same?

Which model switch is it? What OS version?

Hi,

thanks for your reply.

Unfortunately it does not work. The switches do not send RAs, if both have the same address.

It is currently a test deployment on GNS3.

Dell EMC Networking OS10 Enterprise
Copyright (c) 1999-2020 by Dell Inc. All Rights Reserved.
OS Version: 10.5.1.0
Build Version: 10.5.1.0.124
Build Time: 2020-02-12T09:05:20+0000
System Type: S4128F-VM
Architecture: x86_64

Maybe I can test it tomorrow on two physical S4148T-ON.

Hi,

I have tested the configuration on two physical S4148T-ON and got the same results.

After the initial configuration everything works fine, both switches send RAs but after a reboot they
stop sending RAs. To re-enable it, i have to run "no ipv6 na send-ra" and after that "ipv6 ra send-ra"
on the interface.

Because of the following messages I thought that this is related to ipv6 DAD:

2020-04-22T22:56:50.734120+00:00 TOR2 dn_alm 830 - - Node.1-Unit.1:PRI [event], Dell EMC (OS10) %IPV6_DAD_FAILURE: IPv6 Duplicate Address Detected! IPv6 DAD failed on vlan10
2020-04-22T22:56:50.798717+00:00 TOR2 dn_alm 830 - - Node.1-Unit.1:PRI [event], Dell EMC (OS10) %IPV6_DAD_FAILURE: IPv6 Duplicate Address Detected! IPv6 DAD failed on vlan10
2020-04-22T22:56:50.889354+00:00 TOR2 dn_alm 830 - - Node.1-Unit.1:PRI [event], Dell EMC (OS10) %IPV6_DAD_FAILURE: IPv6 Duplicate Address Detected! IPv6 DAD failed on vlan10
2020-04-22T22:57:50.932265+00:00 TOR2 dn_alm 830 - - Node.1-Unit.1:PRI [event], Dell EMC (OS10) %IPV6_DAD_FAILURE: IPv6 Duplicate Address Detected! IPv6 DAD failed on vlan10
2020-04-22T22:57:51.461894+00:00 TOR2 dn_alm 830 - - Node.1-Unit.1:PRI [event], Dell EMC (OS10) %IPV6_DAD_FAILURE: IPv6 Duplicate Address Detected! IPv6 DAD failed on vlan10

But this is not the case, since the error also remains with disabled DAD.

Versions of the physical S4148T:

TOR1# show version
Dell EMC Networking OS10 Enterprise
Copyright (c) 1999-2020 by Dell Inc. All Rights Reserved.
OS Version: 10.5.1.1P1
Build Version: 10.5.1.1P1.149
Build Time: 2020-04-06T15:57:33+0000
System Type: S4148T-ON
Architecture: x86_64
Up Time: 00:17:42

TOR2# show version
Dell EMC Networking OS10 Enterprise
Copyright (c) 1999-2020 by Dell Inc. All Rights Reserved.
OS Version: 10.5.1.1P1
Build Version: 10.5.1.1P1.149
Build Time: 2020-04-06T15:57:33+0000
System Type: S4148T-ON
Architecture: x86_64
Up Time: 00:12:31

I got sufficient information from your soul of heart.Thank you so much

I got a similar problem with my pair of S5232 except that I wanted fe80::1 to be the virtual-address.

How is ipv6 nd send-ra intended to be configured when using vrrp?

Hello,
If possible, could you private message me the service tag of the switch and which country the switch is located in? I will be checking.

Hi again, 

Please find short explanation of how VRRP will work with IPV6 SLAAC.

Each router will send its link-local RA instead of VRRP ipv6 VIP, so if autoconfig is enabled, unfortunately, OS10 won't use VRRP VIP for ipv6 router advertisements, so failover will be depended on ipv6 stack convergence

In nutshell, when autoconfig is on, the host will receive IPV6 advertisement pointing to link-local address of router and not to IPV6 VRRP VIP.

Hope this will help!