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EtherChannel

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EtherChannel Overview

EtherChannel is a Cisco technology that enables the aggregation or bundling of switchports into one logical link. Bundling multiple switchport ethernet links into one logical channel increases bandwidth as well creating redundancy and fault tolerance. For example, a bundle of four switchports into one EtherChannel would provide four times the bandwidth coming to and from the switch. EtherChannel bundles or port groups can be run from switch-to-switch or switch-to-server if the server's network interfaces cards (NICs) support EtherChannel. You can bundle up to eight switchports in one Etherchannel port group with no more than six EtherChannel port groups per switch.

Instructions

In this Packet Tracer 6.2 activity you configure different forms of EtherChannel on switches S1, S2 and S3. The PCs have already been configured with IP addresses, subnet masks and default gateways.

1. Create VLANs 10 and 20 on all three switches
2. On both S1 and S2 configure switchport 0/1 as an access port and add it to VLAN10.
Configure switchport 0/10 as an access port and add it to VLAN20.
3. Configure the open standard for EtherChannel, Link Aggregation Control Protocol (LACP 802.3ad) as channel-group 1 on both S1 and S2 Gigabit Ethernet switchports 0/1 and 0/2.
4.
Configure Cisco's Port Aggregation Protocol (PAgP) for EtherChannel as channel-group 2 between S2 and S3 Fast Ethernet switchports 0/21-24.
5. Configure Cisco's EtherChannel manually with no PAgP as channel-group 3 between S3 and S1 Fast Ethernet switchports 0/17-20.
6. Configure all three resulting virtual or logical interfaces (port-channel interfaces) as trunks and allowing only VLANs 10 and 20.
7. Verify the EtherChannels with show etherchannel commands and by
pinging from PC0 to PC2 and PC1 to PC3.


Download


etherchannel-begin.zip

Note: This Packet Tracer activity requires Packet Tracer version 6.2 minimum.

Video Walkthrough Tutorial

 

 

CLI Command Examples

S1(config)# vlan 10
S1(config-vlan)# vlan 20

S1(config-vlan)# exit
S1(config)# int f0/1
S1(config-if)# switchport mode access
S1(config-if)# switchport access vlan 10
S1(config-if)# int f0/10
S1(config-if)# switchport mode access
S1(config-if)# switchport access vlan 20
<repeat commands above on S2>

S1(config)# int range g0/1-2
S1(config-if)# channel-group 1 mode active
S1(config-if)# exit
S1(config)# int port-channel 1
S1(config-if)# switchport mode trunk
S1(config-if)# switchport trunk allowed vlan 10,20

S2(config)# int range g0/1-2
S2(config-if)# channel-group 1 mode passive
S2(config-if)# exit
S2(config)# int port-channel 1
S2(config-if)# switchport mode trunk
S2(config-if)# switchport trunk allowed vlan 10,20

 
S3(config)# vlan 10
S3(config-vlan)# vlan 20

S3(config)# int range f0/21-24
S3(config-if)# channel-group 2 mode desirable
S3(config-if)# exit
S3(config)# int port-channel 2
S3(config-if)# switchport mode trunk
S3(config-if)# switchport trunk allowed vlan 10,20

S2(config)# int range f0/21-24
S2(config-if)# channel-group 2 mode auto
S2(config-if)# exit
S2(config)# int port-channel 2
S2(config-if)# switchport mode trunk
S2(config-if)# switchport trunk allowed vlan 10,20

S3(config)# int range f0/17-20
S3(config-if)# channel-group 3 mode on
S3(config-if)# exit
S3(config)# int port-channel 3
S3(config-if)# switchport mode trunk
S3(config-if)# switchport trunk allowed vlan 10,20

S1(config)# int range f0/17-20
S1(config-if)# channel-group 3 mode on
S1(config-if)# exit
S1(config)# int port-channel 3
S1(config-if)# switchport mode trunk
S1(config-if)# switchport trunk allowed vlan 10,20

 

Last Updated on Friday, 17 April 2015 13:52
 
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