Reference Guide

Interfaces | 427
Input 00.01Mbits/sec, 2 packets/sec
Output 81.60Mbits/sec, 133658 packets/sec
Time since last interface status change: 04:31:57
FTOS>
When more than one interface is added to a Layer 2 port channel, FTOS selects one of the active interfaces
in the port channel to be the Primary Port. The primary port replies to flooding and sends protocol PDUs.
An asterisk in the
show interfaces port-channel brief command indicates the primary port.
As soon as a physical interface is added to a port channel, the properties of the port channel determine the
properties of the physical interface. The configuration and status of the port channel are also applied to the
physical interfaces within the port channel. For example, if the port channel is in Layer 2 mode, you cannot
add an IP address or a static MAC address to an interface that is part of that port channel. As the following
example illustrates, interface GigabitEthernet 1/6 is part of port channel 5, which is in Layer 2 mode, and
an error message appeared when an IP address was configured.
FTOS(conf-if-portch)#show config
!
interface Port-channel 5
no ip address
switchport
channel-member GigabitEthernet 1/6
FTOS(conf-if-portch)#int gi 1/6
FTOS(conf-if)#ip address 10.56.4.4 /24
% Error: Port is part of a LAG Gi 1/6.
FTOS(conf-if)#
Reassign an interface to a new port channel
An interface can be a member of only one port channel. If the interface is a member of a port channel, you
must remove it from the first port channel and then add it to the second port channel.
Each time you add or remove a channel member from a port channel, FTOS recalculates the hash
algorithm for the port channel.
To reassign an interface to a new port channel, use these commands in the following sequence in the
INTERFACE mode of a port channel:
Step Command Syntax Command Mode Purpose
1 no channel-member interface INTERFACE
PORT-CHANNEL
Remove the interface from the first port
channel.
2
interface port-channel id number INTERFACE
PORT-CHANNEL
Change to the second port channel
INTERFACE mode.
3
channel-member interface INTERFACE
PORT-CHANNEL
Add the interface to the second port channel.