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August 2005 Page 7 Dell Enterprise Product Group
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