© Copyright IBM Corp. 2011 Chapter 9. Ports and Trunking 113
LACP Minimum Links Option
For dynamic trunks that require a guaranteed amount of bandwidth to be considered
useful, you can specify the minimum number of links for the trunk. If the specified
minimum number of ports are not available, the trunk link will not be established. If
an active LACP trunk loses one or more component links, the trunk will be placed in
the down state if the number of links falls to less than the specified minimum. By
default, the minimum number of links is 1, meaning that LACP trunks will remain
operational as long as at least one link is available.
The LACP minimum links setting can be configured as follows:
•
Via interface configuration mode:
•
Or via portchannel configuration mode:
LACP Configuration Guidelines
Consider the following guidelines when you configure LACP trunks:
•
The range of potential LACP trunk IDs is 53-104.
•
When an LACP trunk forms, the trunk ID is determined by the lowest port number
in the trunk. For example, if the lowest port number is 1, then the LACP trunk ID
is 53.
•
Each port that is configured to participate in LACP must be set to full duplex.
Configuring LACP
Use the following procedure to configure LACP for port 7 and port 8 to participate in
link aggregation.
1. Configure port parameters. All ports that participate in the LACP trunk group
must have the same settings, including VLAN membership.
2. Select the port rant and define the admin key. Only ports with the same admin
key can form an LACP trunk group.
3. Set the LACP mode.
RS G8000# interface port <port number or range>
RS G8000(config-if)# port-channel min-links <minimum links>
RS G8000(config-if)# exit
RS G8000# interface portchannel lacp <LACP key>
RS G8000(config-PortChannel)# port-channel min-links <minimum links>
RS G8000(config-if)# exit
RS G8000(config)# interface port 7-8
RS G8000(config-if)# lacp key 100
RS G8000(config-if)# lacp mode active
RS G8000(config-if)# exit
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