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Chapter 7
Multi-Layer Switching (MLS)
F I G U R E 7 . 9
Single switch, two routers
Summary
Y
ou have learned a great deal in this chapter. It is important that you
understand the fundamentals of MLS as well as the different platforms that
support it.
The fact that MLS is supported on multiple platforms shouldn't be of
much concern. However, implementation and configuration syntax depend
greatly on the equipment and topology being deployed.
To summarize, in this chapter you learned the following:
The fundamentals of MLS: layer 3 switching
Components of MLS
System and topology requirements
Candidate and enable packet identification processes
Layer 3 cache entry properties
MLS configuration on multiple platforms
VLAN10
VLAN50
FE0/0
FE0/0
Switch1
X marks the spot of the
packet rewrite and
shortcut switching.
Enable packet
(RouterB)
Candidate packet
(RouterA)
Candidate
packet
(RouterB)
HostA
HostD
RouterA
RouterB
Enable packet
(RouterA)
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