6.4.1 Packet Tracer - Implement EtherChannel (Instructor Version)
Topology
6.4.1 Packet Tracer - Implement EtherChannel
Objectives
- Part 1: Build the network
- Part 2: Configure EtherChannel
Background
You have been assigned the task of designing an EtherChannel implementation for a company that wants to improve the performance of their switch trunk links. You will try several different ways of implementing the EtherChannel links in order to evaluate which is the best for the company. You will build the topology, configure trunk ports, and implement LACP and PAgP EtherChannels.
Instructions
Part 1: Build the network.
Use the table below to build the switch topology.
Step 1: Obtain the devices that are required.
a. Click the Network Devices icon in the bottom tool bar.
b. Click the Switches entry in the submenu.
c. Locate the 2960 switch icon. Click and drag the icon for the 2960 switch into the topology area.
d. Repeat the step above so that there are three 2960 switches in the topology area.
e. Arrange the devices into a layout that you can work with by clicking and dragging.
Step 2: Name the devices.
The devices have default names that you will need to change. You will name the devices SWA, SWB, and SWC. You are changing the display names of the devices. This is the text label that appears below each device. It is not the host name. Your display names must match the names that are given in this step exactly. If a display name does not match, you will not be scored for your device configuration.
a. Click the device display name that is below the device icon. A text field should appear with a flashing insertion point. If the configuration window for the device appears, close it and try again by clicking a little further away from the device icon.
b. Replace the current display name with the appropriate display name.
c. Repeat until all devices are named.
Change device display names by clicking on the device name in the topology and typing a new name. Whenever this is done, the device name is required to match the device name in the instructions exactly.
Step 3: Connect the devices.
a. Click the orange lightning bolt Connections icon in the bottom toolbar.
b. Locate the Ethernet straight-through cable icon. It looks like a solid black diagonal line.
c. To connect the device, click the Ethernet straight-through cable icon and then click the first device that you want to connect. Select the correct port and then click the second device. Select the correct port and the devices will be connected.
d. Connect the devices as specified in the table below.
| Port Channel | Devices | Port Connections | Type |
|---|---|---|---|
| 1 1 |
SWA to SWB | G0/1 to G0/1 | PAgP |
| G0/2 to G0/2 | |||
| 2 2 |
SWA to SWC | F0/21 to F0/21 | LACP |
| F0/22 to F0/22 | |||
| 3 3 |
SWB to SWC | F0/23 to F0/23 | LACP |
| F0/24 to F0/24 |
This activity requires some knowledge of how to build topologies in Packet Tracer. You may want to quickly train students on how to do the following:
1. Select specific device models and drag devices to the work area, specifically 2960 switches.
2. Select an Ethernet-straight through cable.
3. Connect devices with an Ethernet-copper straight through cable to specific device ports.
Press and holding Ctrl key will help you complete this task faster
Part 2: Configure EtherChannel
On each switch, configure the ports that will be used in the Port Channels as static trunk ports.
Step 1: Configure a PAgP EtherChannel.
Follow the procedure that was used in previous activities to configure Port Channel 1 as a PAgP EtherChannel between SWA and SWB. Both sides should negotiate the EtherChannel.
Step 2: Configure a LACP EtherChannel.
Configure Port Channel 2 as an LACP channel between SWA and SWC. Both sides should negotiate the EtherChannel.
Step 3: Configure a Backup LACP EtherChannel
Configure Port Channel 3 channel as an LACP channel between SWB and SWC. In this case, SWC initiates negotiation with SWB. SWB does not initiate negotiation of the channel.
Device Configs - Final
Switch SWA
! ============================================================== !--- 6.4.1 Packet Tracer - Implement EtherChannel !--- ANSWER SCRIPT FOR SWITCH SWA !--- Usage: from the console (or a Telnet/SSH session, if already reachable) on SWA, enter privileged EXEC mode with "enable", then paste this whole file. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless. !--- SWA sits between SWB (Port Channel 1, PAgP, G0/1-2) and SWC (Port Channel 2, LACP, F0/21-22). This script trunks and bundles both uplinks. Following the procedure from the referenced prior EtherChannel activity, physical ports are shut down before joining a channel-group (avoiding EtherChannel Misconfig Guard err-disable), and each logical Port-channel interface also gets its own trunk setting. ! ============================================================== enable configure terminal ! -------------------------------------------------------------- !--- Part 2, Step 1: Configure Port Channel 1 as a PAgP EtherChannel (link to SWB) ! -------------------------------------------------------------- !--- "Both sides should negotiate" means both ends actively try to form PAgP - "desirable" here, matched by SWB's own "desirable" (a compatible PAgP pair). interface range GigabitEthernet0/1 - 2 switchport mode trunk shutdown channel-group 1 mode desirable no shutdown interface port-channel 1 switchport mode trunk ! -------------------------------------------------------------- !--- Part 2, Step 2: Configure Port Channel 2 as an LACP EtherChannel (link to SWC) ! -------------------------------------------------------------- !--- "Both sides should negotiate" means both ends use "active" - matched by SWC's own "active" (a compatible LACP pair). interface range FastEthernet0/21 - 22 switchport mode trunk shutdown channel-group 2 mode active no shutdown interface port-channel 2 switchport mode trunk end ! -------------------------------------------------------------- !--- Operational habit (not explicitly required by this lab): save to NVRAM. (Press Enter when prompted for the destination filename.) ! -------------------------------------------------------------- copy running-config startup-config ! ============================================================== !--- Verification (from SWA and its neighbors): !--- SWA# show etherchannel summary -> Po1 shows PAgP with Gi0/1(P)/Gi0/2(P); Po2 shows LACP with Fa0/21(P)/Fa0/22(P) !--- SWA# show interfaces trunk -> Po1 and Po2 both trunking as single logical links ! ==============================================================
Switch SWB
! ============================================================== !--- 6.4.1 Packet Tracer - Implement EtherChannel !--- ANSWER SCRIPT FOR SWITCH SWB !--- Usage: from the console (or a Telnet/SSH session, if already reachable) on SWB, enter privileged EXEC mode with "enable", then paste this whole file. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless. !--- SWB sits between SWA (Port Channel 1, PAgP, G0/1-2) and SWC (Port Channel 3, LACP, F0/23-24). This script trunks and bundles both uplinks. Physical ports are shut down before joining a channel-group, and each logical Port-channel interface also gets its own trunk setting. ! ============================================================== enable configure terminal ! -------------------------------------------------------------- !--- Part 2, Step 1: Configure Port Channel 1 as a PAgP EtherChannel (link to SWA) ! -------------------------------------------------------------- !--- Matches SWA's "desirable" on the other end - a compatible PAgP pair, since "both sides should negotiate." interface range GigabitEthernet0/1 - 2 switchport mode trunk shutdown channel-group 1 mode desirable no shutdown interface port-channel 1 switchport mode trunk ! -------------------------------------------------------------- !--- Part 2, Step 3: Configure Port Channel 3 as a "backup" LACP EtherChannel (link to SWC) ! -------------------------------------------------------------- !--- "SWB does not initiate negotiation of the channel" means passive - SWB only forms LACP if SWC (its own script, "active") initiates. interface range FastEthernet0/23 - 24 switchport mode trunk shutdown channel-group 3 mode passive no shutdown interface port-channel 3 switchport mode trunk end ! -------------------------------------------------------------- !--- Operational habit (not explicitly required by this lab): save to NVRAM. (Press Enter when prompted for the destination filename.) ! -------------------------------------------------------------- copy running-config startup-config ! ============================================================== !--- Verification (from SWB and its neighbors): !--- SWB# show etherchannel summary -> Po1 shows PAgP with Gi0/1(P)/Gi0/2(P); Po3 shows LACP with Fa0/23(P)/Fa0/24(P) !--- SWB# show interfaces trunk -> Po1 and Po3 both trunking as single logical links ! ==============================================================
Switch SWC
! ============================================================== !--- 6.4.1 Packet Tracer - Implement EtherChannel !--- ANSWER SCRIPT FOR SWITCH SWC !--- Usage: from the console (or a Telnet/SSH session, if already reachable) on SWC, enter privileged EXEC mode with "enable", then paste this whole file. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless. !--- SWC sits between SWA (Port Channel 2, LACP, F0/21-22) and SWB (Port Channel 3, LACP, F0/23-24). This script trunks and bundles both uplinks. Physical ports are shut down before joining a channel-group, and each logical Port-channel interface also gets its own trunk setting. ! ============================================================== enable configure terminal ! -------------------------------------------------------------- !--- Part 2, Step 2: Configure Port Channel 2 as an LACP EtherChannel (link to SWA) ! -------------------------------------------------------------- !--- Matches SWA's "active" on the other end - a compatible LACP pair, since "both sides should negotiate." interface range FastEthernet0/21 - 22 switchport mode trunk shutdown channel-group 2 mode active no shutdown interface port-channel 2 switchport mode trunk ! -------------------------------------------------------------- !--- Part 2, Step 3: Configure Port Channel 3 as a "backup" LACP EtherChannel (link to SWB) ! -------------------------------------------------------------- !--- "SWC initiates negotiation with SWB" means active - SWC actively tries to form LACP, matched by SWB's "passive" (a compatible pair). interface range FastEthernet0/23 - 24 switchport mode trunk shutdown channel-group 3 mode active no shutdown interface port-channel 3 switchport mode trunk end ! -------------------------------------------------------------- !--- Operational habit (not explicitly required by this lab): save to NVRAM. (Press Enter when prompted for the destination filename.) ! -------------------------------------------------------------- copy running-config startup-config ! ============================================================== !--- Verification (from SWC and its neighbors): !--- SWC# show etherchannel summary -> Po2 shows LACP with Fa0/21(P)/Fa0/22(P); Po3 shows LACP with Fa0/23(P)/Fa0/24(P) !--- SWC# show interfaces trunk -> Po2 and Po3 both trunking as single logical links ! ==============================================================
Download Packet Tracer (.pka) file:
Previous Lab
6.3.4 Packet Tracer – Troubleshoot EtherChannel
