Cisco WS-C6506 Software Manual page 108

Example VLAN Trunk Configurations
Figure 5-1
Switch A
To configure the switches to form a two-port EtherChannel bundle and then configure the EtherChannel
bundle as an ISL trunk link, perform these steps:
Confirm the channeling and trunking status of the switches by entering the show port channel and show
Step 1
trunk commands.
Switch_A> (enable) show port channel
No ports channelling
Switch_A> (enable) show trunk
No ports trunking.
Switch_A> (enable)
Switch_B> (enable) show port channel
No ports channelling
Switch_B> (enable) show trunk
No ports trunking.
Switch_B> (enable)
Configure the ports on Switch A to negotiate an EtherChannel bundle with the neighboring switch by
Step 2
entering the set port channel command. 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 1/1-2 desirable
Port(s) 1/1-2 channel mode set to desirable.
Switch_A> (enable) %PAGP-5-PORTFROMSTP:Port 1/1 left bridge port 1/1
%PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/2
%PAGP-5-PORTFROMSTP:Port 1/2 left bridge port 1/2
%PAGP-5-PORTTOSTP:Port 1/1 joined bridge port 1/1-2
%PAGP-5-PORTTOSTP:Port 1/2 joined bridge port 1/1-2
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-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
After the EtherChannel bundle is negotiated, verify the configuration by entering the show port channel
Step 3
command.
Switch_A> (enable) show port channel
Port
----- ---------- --------- ----------- ------------------------- ----------
1/1
1/2
----- ---------- --------- ----------- ------------------------- ----------
Switch_A> (enable)
Switch_B> (enable) show port channel
Port
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
5-16
ISL Trunk Over Fast EtherChannel Link
1/1
1/2
Fast EtherChannel
ISL trunk link
Status Channel Channel
mode status
connected desirable channel
connected desirable channel
Status Channel Channel
Switch B
3/1
3/2
Neighbor
device
WS-C5000 009979082(Sw
WS-C5000 009979082(Sw
Neighbor
Chapter 5 Configuring Ethernet VLAN Trunks
Neighbor
port
3/1
3/2
Neighbor
OL-8978-04