3Com Switch 8800 Advanced Software V5 Configuration Guide

Load Sharing in a Link Aggregation Group 73
■ If they are the same, compare the system MAC addresses. The system with the
smaller ID has higher priority. (the lower the LACP priority, the smaller the MAC
address, and the smaller the device ID)
2 Compare the port IDs that each comprises a port LACP priority and a port number
on the system with higher ID as follows:
■ Compare the port LACP priorities. The port with lower port LACP priority wins
out.
■ If two ports with the same port LACP priority are present, compare their port
numbers. The state of the ports with lower IDs then change to selected and the
state of the ports with higher IDs to unselected, so does the state of their
corresponding remote ports. (the lower the LACP priority, the smaller the port
number, and the smaller the port ID)
n
Currently, the number of the selected ports in a static LACP aggregation group
created on a Switch 8800 can be up to eight.
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. These configurations include port rate, duplex mode, link state and other
basic configurations described in
“Consistency Considerations for Ports in an
Aggregation Group” on page 70.
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 as it does in a dynamic aggregation
group; 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.
A link aggregation group is a load sharing aggregation group if it contains two or
more selected ports. A link aggregation group is a non-load sharing aggregation
group if it contains only one selected port.
c
CAUTION: A load sharing link aggregation group remains a load sharing link
aggregation group even if the number of the selected ports in it decreases to one.
(The number of the selected ports in a link aggregation group decreases if the
selected ports are removed from it.)