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Allied Telesis high availability solutions
work equally well for IPv4 and IPv6
networks, and even networks that are
in transition using a combination of both
protocols. To provide a highly resilient
solution requires that the infrastructure
and features of the networking
equipment, as well as the trafc passing
through the devices, is well managed
and can survive any disturbance or
interruption to normal network
connectivity.
With most networks making use
of routing protocols, it is imperative
that the dynamic nature of this trafc
management is handled in any fault
situation to ensure continuous online
resource access is not compromized.
Adding dynamic routing resilience
to high availability network design
guarantees superior performance.
Two key technologies from which we
have built the high-availability IPv6
solution are Virtual Chassis Stacking
(VCStack
™
) and graceful restart (also
known as non-stop forwarding).
VCStack provides a network
infrastructure with no single point of
failure that automatically responds to
any connectivity loss. Graceful restart
manages changes in the network
topology to keep active paths through
the network available, and minimize
downtime that might otherwise be
experienced when a network switch is
taken ofine.
We can take a closer look at these two
technologies.
Virtual Chassis Stacking
(VCStack)
Using VCStack at the core of your
network allows multiple switches to
appear as a single virtual chassis. This
virtual chassis acts as a single switch,
simplifying management.
With VCStack, Allied Telesis now
provides a truly resilient network. In
normal operation, all bandwidth and all
routing power in the network are fully
available for use all the time. If a link or
device fails, some of the bandwidth or
forwarding power will be lost, but the
network will still be fully operational and
all remaining resources will continue to
be fully utilized.
Allied Telesis provides a completely
resilient solution for next generation
networks – minimize downtime
and maximize access to online
resources and applications.
High availability IPv6 networking
High Availability IPv6 |5