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17
Chapter 17: IP Routing in the LAN 415
Key Topic 
Element
Description
Page 
Number
List
Troubleshooting suggestions for correct operation of a Layer 3 
switch that uses SVIs
405
Figure 17-4
Layer 3 switching with routed ports concept and configuration
407
List
show
commands that list Layer 3 routed ports in their output
408
Figure 17-7
Layer 3 EtherChannel concept and configuration
411
List
List of configuration settings that must be consistent before IOS 
will bundle a link with an existing Layer 3 EtherChannel
414
Key Terms You Should Know
router-on-a-stick (ROAS), switched virtual interface (SVI), VLAN interface, Layer 
3 EtherChannel (L3 EtherChannel), routed port, Layer 3 switch, multilayer switch, 
subinterfaces
Command References
Tables 17-4 and 17-5 list configuration and verification commands used in this chapter. As an 
easy review exercise, cover the left column in a table, read the right column, and try to recall 
the command without looking. Then repeat the exercise, covering the right column, and try 
to recall what the command does.
Table 17-4
Chapter 17 Configuration Command Reference
Command
Description
interface
type number.subint
Router global command to create a subinterface and to enter 
configuration mode for that subinterface
encapsulation dot1q
vlan-id
[
native
]
Router subinterface subcommand that tells the router to 
use 802.1Q trunking, for a particular VLAN, and with the 
native
keyword, to not encapsulate in a trunking header
[
no
]
 ip routing
Global command that enables (