Hey there is configuration example in concepts guide.Page 1304.
The ExtremeXOS software supports the use of IPv6-in-IPv4 tunnels (known as configured tunnels or6in4 tunnels) and IPv6-to-IPv4 tunnels (known as 6to4 tunnels). Both types of tunnels are used to
connect regions of IPv6 routing across a region of IPv4 routing. From the perspective of the router, the
tunnel across the IPv4 region is one hop, even if multiple IPv4 routers are traversed during transport.
A 6in4 tunnel connects one IPv6 region to one other IPv6 region.
Multiple 6in4 tunnels can be configured on a single router to connect with multiple IPv6 regions.
Dynamic and static routing can be configured across a 6in4 tunnel. Hosts in the IPv6 regions need not
know anything about the configured tunnel, since packets destined for remote regions are sent over
the tunnel like any other type of routing interface.
A 6to4 tunnel connects one IPv6 region with multiple IPv6 regions. Only one 6to4 tunnel can be
configured on a single router.