Avaya 8800 Planning And Engineering, Network Design page 137

Internet Protocol version 6
Edge routers and end systems (at the end of the tunnel) must be dual-stack implementations. At
each end of the tunnel, configure the IPv4 and IPv6 addresses of the dual-stack routing switch on
the tunnel interface and identify the entry and exit (or source and destination) points using IPv4
addresses. For Enterprise networks, your ISP provides you with the appropriate IPv6 address prefix
for your site. Your ISP also provides you with the required destination IPv4 address for the exit point
of the tunnel.
The following figure shows a manually-configured tunnel.
For more information, see Avaya Ethernet Routing Switch 8800/8600 Configuration — IPv6 Routing
Operations, NN46205-504.
Figure 57: IPv6 tunnels
Because each tunnel exists between only two routing switches and is independently managed,
additional tunnels are required whenever you add new routing switches. Each additional tunnel and
switch increases management overhead. Network Address Translation (NAT), when applied to the
outer IPv4 header, is allowed along the path of the tunnel only if the translation map is stable and
preestablished.
June 2016 Planning and Engineering — Network Design 137
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