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In general, the router-on-a-stick
approach to inter-VLAN routing is most appropriate when other
options are not available. This is not to say that the
router-on-a-stick design is a poor choice; it is only a reflection
that other options tend to provide higher throughput and
functionality. Also, because the router-on-a-stick technique
functions as if the router were sitting on the edge of the network
(at least as far as the Layer 2 network is concerned), it tends to
be less tightly integrated with the rest of the campus network.
Newer approaches, such as MLS, seek to place routing in the middle
of the network where it can have a greater influence on the overall
scalability and stability of the network.
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