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Chapter 5: Layer 3 Interface Configuration 75

Section 5-3

number option specifies the channel group number with which each channel mem-

ber will be configured.

2. Configure protocol information on the port channel:

(interface) ip address address netmask

Use the appropriate command to configure the Layer 3 interface with network

addressing. The example here shows the configuration of an IP address.

Caution If you create a channel that uses an address that is currently configured on the

interface, you must first remove that address before assigning it to the port channel inter-

face. Step 3b describes how to remove a protocol address.

3. Assign physical Layer 3 interfaces to the channel group.

a. Select an interface:

(global) interface type mod/port

Select a Layer 3 interface to assign to the channel group. Because you are creat-

ing a Layer 3 channel, the interface must be a Layer 3 interface. For switches that

enable an interface to act as a Layer 2 or Layer 3 interface, issue the command no

switchport to ensure the interface operates at Layer 3.

b. Remove any protocol addressing:

(interface) no ip address

If the interface has been configured with any protocol addressing, such as IP, you

must remove the protocol address with the no form of the command that estab-

lished the addressing. For example, the no ip address command removes an IP

address from the interface.

c. Assign the interface to the channel group:

(interface) channel-group number mode {auto | desirable | on}

For a physical Layer 3 interface that you want to be part of the channel, specify

the channel-group command. The number option specifies with which port

channel interface the physical interface is associated. The modes specify how the

channel communicates to the other side of the link. (Refer to the section “4-4:

EtherChannel” in Chapter 4 for more details on the channel modes.)

d. Verify that the interface is enabled:

(interface) no shutdown

The default status of many Layer 3 interfaces is shutdown, which is a disabled

state. To ensure that the interface is operational, you need to enable the interface

with the command no shutdown.

e. Repeat Steps 4a through 4d for each same-speed interface that will be a member

of the channel.

Cisco Catalyst 2000 User Manual

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