121
Figure 5.1 Use of IPv6 VLANs at Southampton [18]
As
traffic
in
the
site grows, multiple routers can be dedicated to this task for internal
routing,
or
a router
with
multiple
interfaces.
There
currently
four
routers
with quad Fast
Ethernet
interfaces. BSD allows
multiple-VLAN
tagging
per
interface,
so
in
light
traffic
conditions
the
interface count
can be collapsed.
But problem occur
when BSD
begin
to
handle more IPv6 traffic.
External IPv6 connectivity was configured using a Cisco 7206, for unicast and multicast
(SSM
and
PIM-SM),
with
IPv6
multicast
routed
internally
onto
the
VLANs
using
the
BSD
IPv6
multicast
support.
The
connection
to
the
JANET
IPv6
service
is
delivered
natively through the LeNSE regional network.
The longer term plan is to use IPv6 firewalling on the Nokia IP740; until then the firewall
is
an additional
BSD
system,
on
which
ports
are
blocked
by
default.
This
is
a
partially
 |