Specifications

176 Implementing IBM System Networking 10Gb Ethernet Switches
Follow these steps to configure and activate LACP trunks:
1. Configure the global LACP parameters by running the following commands:
a. Run lacp system-priority <1-65535> to define the priority value for the switch. Lower
numbers provide higher priority. The default value is 32768. We use the default value
in our example.
b. Run lacp timeout {short|long} to define the timeout period before invalidating LACP
data from a remote partner. Choose short (3 seconds) or long (90 seconds). The
default value is long, which is used in our example.
a. Run no lacp <1-65535> to delete the selected LACP trunk, based on its admin key.
This command is equivalent to disabling LACP on each of the ports configured with the
same admin key.
2. Configure the LACP ports by running the following commands:
a. Set the LACP mode for the ports by running lacp mode {off|active|passive}.
You must set the port’s LACP mode to active to activate LACP negotiation. You can
set other port’s LACP mode to passive, to reduce the amount of LACPDU traffic at the
initial trunk-forming stage.
The LACP ports mode configuration is shown in Example 5-23.
Example 5-23 LACP ports mode configuration
ACC-1#configure terminal
Enter configuration commands, one per line. End with Ctrl/Z.
ACC-1(config)#interface port 5,6
ACC-1(config-if)#lacp mode active
ACC-1(config-if)#^Z
ACC-1#
b. Set the LACP priority value for a selected port by running lacp priority <1-65535>.
Lower numbers provide higher priority. The default value is 32768. The LACP port
priority configuration is shown in Example 5-24.
Example 5-24 LACP port priority configuration
ACC-1#configure terminal
Enter configuration commands, one per line. End with Ctrl/Z.
ACC-1(config)#interface port 5
ACC-1(config-if)#lacp priority 16384
ACC-1(config-if)#^Z
ACC-1#
Important:
򐂰 When the system is initialized, all ports by default are in LACP off mode and are
assigned unique admin keys.
򐂰 A dynamic trunk is configured in the reference architecture on the link between ACC-1
and ACC-2
Preferred practice: Use a timeout value of long to reduce LACPDU processing. If
your RackSwitch G8124 switche’s processor utilization rate remains at 100% for
periods of 90 seconds or more, consider using static trunks instead of LACP.