Lab – Troubleshooting EtherChannel
Topology
Addressing Table
Device
Interface
IP Address
Subnet Mask
S1
VLAN 99
192.168.1.11
255.255.255.0
S2
VLAN 99
192.168.1.12
255.255.255.0
S3
VLAN 99
192.168.1.13
255.255.255.0
PC-A
NIC
192.168.0.2
255.255.255.0
PC-C
NIC
192.168.0.3
255.255.255.0
VLAN Assignments
VLAN
Name
10
User
99
Management
Objectives
Part 1: Build the Network and Load Device Configurations
Part 2: Troubleshoot EtherChannel
Background / Scenario
The switches at your company were configured by an inexperienced network administrator. Several errors in
the configuration have resulted in speed and connectivity issues. Your manager has asked you to
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Page
1
of
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Lab – Troubleshooting EtherChannel
troubleshoot and correct the configuration errors and document your work. Using your knowledge of
EtherChannel and standard testing methods, find and correct the errors. Ensure that all of the EtherChannels
use Port Aggregation Protocol (PAgP), and that all hosts are reachable.
Note
: The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Other
switches and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the
commands available and output produced might vary from what is shown in the labs.
Note
: Make sure that the switches have been erased and have no startup configurations. If you are unsure,
contact your instructor.
Required Resources
3 Switches (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable)
2 PCs (Windows 7, Vista, or XP with a terminal emulation program, such as Tera Term)
Console cables to configure the Cisco IOS devices via the console ports
Ethernet cables as shown in the topology
Part 1:
Build the Network and Load Device Configurations
In Part 1, you will set up the network topology, configure basic settings on the PC hosts, and load
configurations on the switches.
Step 1:
Cable the network as shown in the topology.
Step 2:
Configure the PC hosts.
Step 1:
Erase the startup and VLAN configurations and reload the switches.
Step 3:
Load switch configurations.
Load the following configurations into the appropriate switch. All switches have the same passwords. The
privileged EXEC password is
class
. The password for console and vty access is
cisco
. As all switches are
Cisco devices, the network administrator decided to use Cisco’s PAgP on all port channels configured with
EtherChannel. Switch S2 is the root bridge for all VLANs in the topology.
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