Setting up Cisco EtherChannels – Static, PAgP, and LACP


In this lab I used a Cisco Catalyst WS-C3750G-24TS switch [IOS 12.2(25)SEE3] and a Cisco Catalyst WS-C3560G-24TS switch [IOS 12.2(40)SE]. I also physically connected GigabitEthernet 1/0/17 on the Catalyst 3750G to GigabitEthernet 0/17 on the Catalyst 3560G; I did the same for GigabitEthernet 1/0/18 and GigabitEthernet 0/18 respectively. At this point I have two GigabitEthernet connections between the switches. Below I demonstrate configuring a basic static etherchannel.

I first configure the Catalyst 3750G switch:

Cisco WS-C3750G-24TS EtherChannel Setup

Cisco WS-C3750G-24TS EtherChannel Setup



Next I configure the Catalyst 3560G:
Cisco WS-C3560G-24TS EtherChannel Setup

Cisco WS-C3560G-24TS EtherChannel Setup



Below you can see that the port-channel is up; notice I didn’t have to do a “no shut” on the port-channel as is the case with Force10 switches.
Port-channel is up

Port-channel is up






To configure PAgP or LACP instead, I could have just selected the appropriate option as demonstrated above with the “channel-group 1 mode ?” command. Additionally, I would have had to apply the following command to all interfaces: “channel-protocol [lacp or pagp]“.

Twitt

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One Response to “Setting up Cisco EtherChannels – Static, PAgP, and LACP”

  1. [...] a LAG; please reference my earlier posts Creating a Link Aggregation Group (LAG) in FTOS and Setting up Cisco EtherChannels – Static, PAgP, and LACP for this information. 1. – I already have a static LAG containing two 1 gig ports setup on the [...]

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