?– When building the cable plant from the building access layer to the building
distribution layer devices, remember that these links will carry aggregate traf?¬?c from
the end nodes at the access layer to the building distribution switches. Ensure that these
links have adequate bandwidth capability. You can use EtherChannel bundles here to
add bandwidth as necessary.
?– At the distribution layer, select switches with adequate performance to handle the load
of the current access layer. In addition, plan some port density for adding trunks later
to support new access layer devices. The devices at this layer should be multilayer
(Layer 2 and Layer 3) switches that support routing between the workgroup VLANs
and network resources. Depending on the size of the network, the building distribution
layer devices can be ?¬?xed chassis or modular. Plan for redundancy in the chassis and
in the connections to the access and core layers, as business objectives dictate.
?– The campus backbone equipment must support high-speed data communications
between other distribution modules. Be sure to size the backbone for scalability, and
plan for redundancy.
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