3Com MSR 50 Series, Руководство по настройке

Страница: 349 / 2443

Load Sharing in a Link Aggregation Group 349
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 to an aggregation 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.
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.
n
■
After you remove all ports but one selected port from a load sharing
aggregation group, whether the group continues to perform load sharing
varies with device models.
■
The load sharing implementation and the number of load sharing aggregation
groups supported varies with device models.
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.
For more information about port-groups, refer to “Configuring a Port Group” on
page 92 and “Ethernet Interface Configuration” on page 89 .