Another pressing scenario is LAN-over-MAN extension across inter-campus sites. For
example, many operations are being moved from high-rent downtown areas to suburban
regions to lower costs and facilitate worker access. This is driving the need for virtual
LAN solutions via underlying point-to-point EPL or multipoint EPLAN services.
Note that direct LAN extension at the Layer 2 level also reduces the need for costly
Layer 3 devices because only a few routers or MPLS nodes are needed for external
connectivity.
Now most corporate demands today are comprised of fractional EPL and represent
a growing migration from legacy private lines. In general, these speeds are best provisioned
by electronic-layer routing and switching solutions such as EoS or EoMPLS.
EoS is particularly cost-effective in low demand incumbent networks, as it can augment
existing legacy voice and leased line offerings. Alternatively, for carriers operating
CWDM/DWDM infrastructures, thin-mux aggregation devices can be considered in
conjunction with EoWDM. Regardless, a gradual shift toward gigabit-level EPL speeds
is expected. For example, 10 Gbps Ethernet interfaces are now becoming standard on
most servers and storage arrays.
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