Qtech QSW-2900-24T4-AC [61/209] Load sharing in a link aggregation group

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c) Port configuration considerations in static aggregation

Like in a manual aggregation group, in a static LACP aggregation group, only ports with configurations

consistent with those of the master port can become selected. You need to maintain the basic configurations of these

ports manually to ensure consistency. As one configuration change may involve multiple ports, this can become

troublesome if you need to do that port by port. As a solution, you may add the ports into an aggregation port group

where you can make configuration for all member ports.

When the configuration of some port in a static aggregation group changes, the system does not remove the

aggregation; instead, it re-sets the selected/unselected state of the member ports and re-selects a master port.

3.6 Load Sharing in a Link Aggregation Group

Link aggregation groups fall into load sharing aggregation groups and non-load sharing aggregation groups

depending on their support to load sharing.

A load sharing aggregation group can contain at least one selected port but a non-load sharing aggregation

group can contain only one.

Link aggregation groups perform load sharing depending on availability of hardware resources. When

hardware resources are available, link aggregation groups created containing at least two selected ports perform load

sharing, while link aggregation groups created with only one selected port perform load sharing depending on the

model of your device. After hardware resources become depleted, link aggregation groups work in non-load sharing

mode.

3.7 Aggregation Port Group

As mentioned earlier, in a manual or static aggregation group, a port can be selected only when its

configuration is the same as that of the master port in terms of duplex/speed pair, link state, and other basic

configurations. Their configuration consistency requires administrative maintenance, which is troublesome after you

change some configuration.

To simplify configuration, port-groups are provided allowing you to configure for all ports in individual

groups at one time. One example of port-groups is aggregation port group.

Upon creation or removal of a link aggregation group, an aggregation port-group which cannot be

administratively created or removed is automatically created or removed. In addition, you can only assign/remove a

member port to/from an aggregation port-group by assigning/removing it from the corresponding link aggregation

group.

3.8 Link aggregation configuration

Port LACP configuration command includes channel group configuration

Please configure it in global configuration mode:

channel-group channel-group-number

Parameter “channel-group-number” is range from 0 to 5.

For example:

! Create a channel group with the group number being 0

QTECH(config)#channel-group 0

Delete channel group

no channel-group channel-group-number

Add add port members to the group

channel-group channel-group-number mode {active | passive | on}