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Configuring EtherChannel

Completed Topology

Objectives
• View the default Layer 2 configuration. • Configure EtherChannel.

Background/Scenario
EtherChannel enables the switch administrator to increase bandwidth between switches by bundling together between 2 and 8 links. In this scenario, you will bundle two Fast Ethernet links to form a single logical link with an effective full-duplex bandwidth of 400 Mb/s. NOTE: This activity is for observation purposes only and does not require configuration, thus grading will not be conducted.

Task 1: View the Default Configuration.
Step 1. Verify the trunking and VLAN configuration on the switches.
a. On the two switches, enter privileged EXEC mode. b. Perform a show run to view the current configuration. c. Issue the show interfaces trunk and show interfaces switchport commands. Observation: The show interface truck command displayed no output, hence there are no trunk ports configured. The show interfaces switchport command displayed all ports in dynamic auto mode. d. Issue the show vlan command to verify proper VLAN configuration. Observation: VLAN 10 is the only non-default VLAN appearing. Currently, all ports are associated with VLAN 1.

Step 2. Verify the VTP configuration on the switches.
a. From privileged EXEC mode on both DLS1 and DLS2 access layer switches, issue the show vtp status command to verify VTP modes and VLAN information. Observation: Both DLS1 and DLS2 are VTP servers with no VTP domain name configured.

Step 3. Verify IEEE 802.1D spanning-tree.
a. From each switch, issue the show spanning-tree command.

All contents are Copyright © 1992–2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.

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indicating that load balancing across the logical EtherChannel is based on the source MAC address of the data. Task 2: Configure EtherChannel on the switches. Observation: The physical ports F0/11 and F0/12. and the logical port Po1 all appear as 802. Add EtherChannel functionality to DLS1 and DLS2. b. Repeat steps a through c on DLS2. enter the interface range mode for ports F0/11 and F0/12 on with the command interface range f0/11 . Task 3: Verify the EtherChannel configuration. All rights reserved.11Q trunk ports.10. a. c. Create Port Channel 1 with the interface port-channel 1 command. Verify that all switches are running IEEE 802.2. Observation: Ports F0/11 and F0/12 appear under Group 1.12. Verify that S1 is the root bridge for VLANs 1-1001. b. Page 2 of 2 . All contents are Copyright © 1992–2008 Cisco Systems. To enable EtherChannel on DLS1. The ping should be successful. Enter the command channel-group 1 mode desirable. associated with a Port Channel labeled Po1. d.The default port bundling protocol is PAgP.1D spanning-tree. Enter the command show running-config to determine the EtherChannel load-balancing mechanism. Inc. Enter the switchport mode trunk command. a. This document is Cisco Public Information. a. Enter the command show etherchannel summary and observe the output. c. d. Enter the command switchport mode trunk. Enter the command show interface switchport. DLS1 is the spanning-tree root bridge for all VLANs. Step 1.1D. On DLS1. Add a logical Port Channel associated with the physical interfaces. enter the command ping 10.10.CCNA Exploration LAN Switching and Wireless b. Observation: Both switches are running IEEE 802. c. Observation: The output displays “port-channel load-balance src-mac”. b. Step 2.