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EtherChannel Configuration Examples
Figure 6-2
Switch A
Step 1
Make sure that all ports on Switch A and Switch B have the same port configuration, such as VLAN
membership.
Switch_A> (enable) set vlan 100 2/1-2
VLAN 100 modified.
VLAN 1 modified.
VLAN
---- -----------------------
100
Switch_A> (enable)
Switch_B> (enable) set vlan 100 3/1-2
VLAN 100 modified.
VLAN 1 modified.
VLAN
---- -----------------------
100
Switch_B> (enable)
Step 2
Confirm the channeling status of the switches using the show port channel command.
Switch_A> (enable) show port channel
No ports channelling
Switch_A> (enable)
Switch_B> (enable) show port channel
No ports channelling
Switch_B> (enable)
Note that in this example, EtherChannel is configured on for all ports. If you configure ports on, you
Step 3
must configure the ports on both ends of the EtherChannel bundle on. The switches will not negotiate
an EtherChannel port bundle automatically in on mode. The system logging messages provide
information about the formation of the EtherChannel bundle.
Switch_A> (enable) set port channel 2/1-2 on
Port(s) 2/1-2 channel mode set to on.
Switch_A> (enable) %PAGP-5-PORTFROMSTP:Port 2/1 left bridge port 2/1
%PAGP-5-PORTFROMSTP:Port 2/2 left bridge port 2/2
%PAGP-5-PORTTOSTP:Port 2/1 joined bridge port 2/1-2
%PAGP-5-PORTTOSTP:Port 2/2 joined bridge port 2/1-2
Switch_B> (enable) set port channel 3/1-2 on
Port(s) 3/1-2 channel mode set to on.
Switch_B> (enable) %PAGP-5-PORTFROMSTP:Port 3/1 left bridge port 3/1
%PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2
%PAGP-5-PORTTOSTP:Port 3/1 joined bridge port 3/1-2
%PAGP-5-PORTTOSTP:Port 3/2 joined bridge port 3/1-2
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
6-14
Gigabit EtherChannel Port Bundle Example
2/1
2/2
Gigabit EtherChannel
port bundle
Mod/Ports
2/1-2
Mod/Ports
3/1-2
Chapter 6
Configuring Fast EtherChannel and Gigabit EtherChannel
Switch B
3/1
3/2
78-12647-02
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Troubleshooting
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