Configuring LACP to work between Catalyst and 300 Series switches

In this example, we’re configuring and connecting 4 ports on a Catalyst 3560 to 4 ports on an SG300-28P

and aggregating them using LACP. The LACP protocol is a standards-based protocol and both sides of the

link is configured with the same parameters. Catalyst also supports Etherchannel and PAgP, both of

which are proprietary and cannot be used between these switches.

First we’ll configure the 3560:

1) On the interfaces which will be part of the LAG, create a channel group (link aggregation group

or port channel) and use either “active” or “passive” mode to enable standards-based LACP:

2) The config will now look like this when you do a “show run”

3) On the port channel, set the encapsulation to 802.1q and enable the VLANs to go over this

trunk.

Configuring Interface

range Gig 1 through 4

Creating a LAG with

these ports

Port Channel has been

created

Channel group has

been assigned to the

4 interfaces

4) Config now looks like this when you do “show run”

5) Now, let’s configure the 300 Series switch.

Under LAG Management, assign the ports to the LAG and enable LACP.

6) On the Catalyst, you’ll see the LAG come up:

7) On the 300 Series switch, you can also see the LAG come up:

8) Now you can add the VLANs to the 300 series switch:

The LAG has

come up

9) And assign the VLANs to the LAG:

10) The config is complete.