[PATCH pve-docs 1/2] sdn: add subnet ipv6 options section

[Hannes Laimer <h.laimer@proxmox.com>]

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 pvesdn.adoc | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/pvesdn.adoc b/pvesdn.adoc
index d20a0eb..267ce97 100644
--- a/pvesdn.adoc
+++ b/pvesdn.adoc
@@ -437,6 +437,34 @@ SNAT:: Enable Source NAT which allows VMs from inside a
 DNS Zone Prefix:: Add a prefix to the domain registration, like
   <hostname>.prefix.<domain>  Optional.
 
+[[pvesdn_config_subnet_ipv6]]
+IPv6 subnet options (EVPN)
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For VNets in an EVPN zone, subnets can optionally configure IPv6 Router
+Advertisement (RA) and related Neighbor Discovery options.
+
+These options are available in the subnet editor under `IPv6 Options`.
+
+Enable RA:: Enable IPv6 Router Advertisements for this subnet.
+
+RDNSS:: Recursive DNS Server advertised via RA.
+
+DHCP Managed (M):: Set the managed-address configuration flag in RA.
+
+DHCP Other (O):: Set the other-configuration flag in RA.
+
+SLAAC (A):: Enable autonomous address configuration for the prefix.
+
+Valid Prefix Lifetime:: Valid lifetime advertised for the prefix in seconds.
+
+Preferred Prefix Lifetime:: Preferred lifetime advertised for the prefix in
+  seconds.
+
+NOTE: `SLAAC` footnote:[RFC-7217 https://datatracker.ietf.org/doc/html/rfc7217]
+is only possible on `/64` prefixes. Router Advertisements have to be enabled for
+SLAAC to work.
+
 
 [[pvesdn_config_controllers]]
 Controllers
-- 
2.47.3