EtherChannel – Port Link Aggregation

EtherChannel or other vendors call this Smartgroup, is  a port link aggregation technology. In other words, a technology which is used to combine several physical links between switches or routers into one logical connection and treat them as single link.

A connection with a single link.

switch, etherchannel

Add another link to get more than 1 Gbps will not work, because Spanning-tree protocol (STP) will block redundant links to prevent a loop.

etherchannel, stp, spanning-tree

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Configuring an EtherChannel Link

etherchannel

Here’s an example of EtherChannel configuration.

SW1 SW2
Port fa0/21 to port fa0/21 SW2 Port fa0/21 to port fa0/21 SW1
Port fa0/22 to port fa0/22 SW2 Port fa0/22 to port fa0/22 SW1
Port fa0/23 to port fa0/23 SW2 Port fa0/23 to port fa0/23 SW1
Port fa0/24 to port fa0/24 SW2 Port fa0/24 to port fa0/24 SW1
Port fa0/1 to PC1 Port fa0/1 to PC3
Port fa0/2 to PC2 Port fa0/2 to PC4

PC1 : 10.10.10.1/24 – VLAN 10
PC2 : 10.10.20.1/24 – VLAN 20
PC3 : 10.10.10.2/24 – VLAN 10
PC4 : 10.10.20.2/24 – VLAN 20

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