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Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Chapter 6 Configuring Fast EtherChannel and Gigabit EtherChannel
EtherChannel Configuration Examples
Figure 6-1 Example of a Fast EtherChannel Port Bundle
To configure a four-port EtherChannel link between two switches, follow these steps:
Step 1 Make sure that all ports on Switch A and Switch B have the same port configuration, including VLAN
membership, speed, and duplex.
Switch_A> (enable) set vlan 50 1/1-4
VLAN 50 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
50 1/1-4
2/1-2
3/1-3
Switch_A> (enable) set port speed 1/1-4 100
Ports 1/1-4 transmission speed set to 100Mbps.
Switch_A> (enable) set port duplex 1/1-4 full
Ports 1/1-4 set to full-duplex.
Switch_A> (enable)
Switch_B> (enable) set vlan 50 3/1-4
VLAN 50 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
50 3/1-4
Switch_B> (enable) set port speed 3/1-4 100
Ports 3/1-4 transmission speed set to 100Mbps.
Switch_B> (enable) set port duplex 3/1-4 full
Ports 3/1-4 set to full-duplex.
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)
Step 3 Configure the ports on Switch A to negotiate a Fast EtherChannel bundle with the neighboring switch.
This example assumes that the neighboring ports on Switch B are in EtherChannel auto mode. The
system logging messages provide information about the formation of the EtherChannel bundle.
Switch_A> (enable) set port channel 1/1-4 desirable
Port(s) 1/1-4 channel mode set to desirable.
Switch_A> (enable) %PAGP-5-PORTFROMSTP:Port 1/1 left bridge port 1/1
Switch A
Switch B
1/1
1/2
1/3
1/4
3/1
3/2
3/3
3/4
Fast EtherChannel
port bundle
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