Configuring a Cisco CatOS Gigabit Ethernet Switch for Dynamic Link Aggregation

The following example shows the Cisco CatOS switch CLI commands for configuring six ports for LACP.

Cat_6509(enable) set channelprotocol lacp 2

Cat_6509(enable) set port lacp-channel 2/1-6 mode active

The first command sets the LAG dynamic protocol to LACP on module 2 (module 2 just happens to be the module that is in the switch used to validate the examples in this paper. Your switch may be configured differently). The second command aggregates six ports on module 2 (referred to in the command as 2/1–6, which stands for ports 1 through 6 on module 2) into a LAG (referred to in the command as lacp-channel), which will use LACP (referred to in the command as mode active).

NOTE: Only the Cisco “mode active” is supported for LACP interoperability with the PowerConnect 5316M. The other modes (passive, auto, on, desirable) should not be used when using LACP between a Cisco switch and the PowerConnect 5316M. This is a common mis-configuration error.

Confirming a successful Dynamic Link Aggregation connection with the PowerConnect 5316M

The following example shows how the PowerConnect 5316M ‘show interfaces port-channel 1’ command can be used to assure that the 5316M has established a LAG and that the LAG is connected.

5316M# show interface port-channel 1

Channel

Ports

.......

.....

ch1

Active: g(11-16)

The output of the command shows the ports g11-16 are ‘Active’. This confirms that there is physical link on all ports in the LAG and that the 5316M has communicated with the Cisco switch to successfully establish an aggregated link on ports g11-16 with LACP.

Confirming a successful Dynamic Link Aggregation connection with Cisco IOS

The following example shows how the Cisco IOS ‘show interfaces port-channel 1 etherchannel’ command can be used to assure that the Cisco has established a LAG and that the LAG is connected.

3750# show interfaces port-channel 1 etherchannel

August 2005

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Dell Enterprise Product Group

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Dell 5316M manual 3750# show interfaces port-channel 1 etherchannel

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