| You learned that VLANs are designed to
control the size of broadcast domains and to keep local traffic
local. Because a VLAN isolates traffic on one broadcast domain,
typically that broadcast domain is given a single layer 3 subnet so
network devices in different VLANs cannot communicate
with one another without some intervening Layer 3 device.
In switched networks, Route
Processors are used to provide communications between VLANs. Route
processors provide VLAN access to shared resources and connect to
other parts of the network that are either logically segmented with
the more traditional subnet approach or require access to remote
sites across wide-area links.
Before you can configure routing
between VLANs, you must have defined the VLANs on the switches in
your network. Issues related to network design and VLAN definition
should be addressed during your network design phase. The issues
that you need to consider include the following:
- Sharing resources between VLANs
- Load balancing
- Redundant links
- Logical addressing
- How to segment the network using
VLANs
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