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Step 1.
Configure the physical interfaces as follows, in interface configuration mode:
A.
Add the 
channel-group
number
mode
on
command to add it to the chan-
nel. Use the same number for all physical interfaces on the same switch, but 
the number used (the channel-group number) can differ on the two neigh-
boring switches.
B.
Add the 
no switchport
command to make each physical port a routed port.
Step 2.
Configure the PortChannel interface:
A.
Use the 
interface port-channel
number
command to move to port-channel 
configuration mode for the same channel number configured on the physi-
cal interfaces.
B.
Add the 
no switchport
command to make sure that the port-channel inter-
face acts as a routed port. (IOS may have already added this command.)
C.
Use the 
ip address
address mask
command to configure the address and 
mask.
NOTE
Cisco uses the term 
EtherChannel
in concepts discussed in this section and then 
uses the term
PortChannel
, with command keyword 
port-channel
, when verifying and con-
figuring EtherChannels. For the purposes of understanding the technology, you may treat 
these terms as synonyms. However, it helps to pay close attention to the use of the terms 
PortChannel
and 
EtherChannel
as you work through the examples in this section because 
IOS uses both.
Example 17-12 shows an example of the configuration for a Layer 3 EtherChannel for switch 
SW1 in Figure 17-7. The EtherChannel defines port-channel interface 12 and uses subnet 
10.1.12.0/24.
VLAN 3
Subnet 10.1.3.0/24
VLAN 2
Subnet 10.1.2.0/24
Fa0/23
Fa0/24
Fa0/22
Fa0/21
Po12
Po12