| Configuring virtual
LANs (VLANs) helps control the size of broadcast domains and keeps
local traffic local. VLANs are associated with individual networks
or subnetworks; therefore, network devices in different VLANs cannot
communicate with one another without a layer 3 router.
When an end station in
one VLAN needs to communicate with an end station in another VLAN,
inter-VLAN communication is required. Routing is required to support
communication between VLANs. You configure one or more Route
Processors or routers to route traffic between VLANs.
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