Addendum

Link Aggregation Groups (LAGs)

This chapter describes the link aggregation control protocol (LACP) and link aggregation group (LAG)

enhancements and contains the following sections:

• Configuring the Uplink Speed of Interfaces as 40 Gigabit Ethernet

• Configuring the Minimum Number of Links to be Up for Uplink LAGs to be Active

• Optimizing Traffic Disruption Over LAG Interfaces On IOA Switches in VLT Mode

• Preserving LAG and Port Channel Settings in Nonvolatile Storage

• Setting Up a Threshold for Utilization of High-Gigabit Port Channels

• Monitoring the Member Links of a LAG Bundle

• Enabling the Verification of Member Links Utilization in a High-Gigabit Port Channel

Configuring the Minimum Number of Links to be Up for

Uplink LAGs to be Active

You can enable the mechanism to activate the LAG bundle for uplink interfaces or ports (the uplink port-

channel (LAG 128)) on the I/O Aggregator only when a minimum or the required number of member

interfaces of the LAG bundle are up. For example, based on your network deployment, you you might

want the uplink LAG bundle to be activated only if a certain number of member interface links are also in

the administratively up state. If you enable this setting, the uplink LAG bundle is brought up only when a

specified minimum number of links are up and the LAG bundle is moved to the down state when the

number of active links in the LAG becomes less than the specified minimum number of interfaces. By

default, the uplink LAG 128 interface is activated when at least one member interface is up. The

Aggregator brings down the LAG bundle when the number of operational links drops below the specified

minimum number and automatically brings up the LAG bundle when the number of operational links

equals or exceeds the configured minimum number.

To configure the minimum or the least number of member links of a LAG bundle or a port channel that

must be up for a LAG bundle to be fully up, perform the following:

Specify the minimum number of member interfaces of the uplink LAG 128 bundle that must be up for

the LAG bundle to be brought up. The default minimum number of member links that must be active

for the uplink LAG to be active is 1. You can enter the minimum-links number command in the

Port Channel Interface 128 Configuration mode to specify this value.

PORT-CHANNEL INTERFACE 128 (conf-if-po-128)

Dell(conf-if-po-128)#minimum-links 4

You can use the show interfaces port-channel command to view information regarding the

configured LAG or port channel settings. The Minimum number of links to bring Port-channel up is field

in the output of this command displays the configured minimum number of active links for the LAG to be

enabled.

Link Aggregation Groups (LAGs)

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