H3C S9500 Series Operation Manual page 44

Operation Manual – Link Aggregation
H3C S9500 Series Routing Switches
place those ports in up state with the same speed/duplex pair, link state and basic
configuration in selected state and all others in unselected state.
When all ports in the group are down, select the port with the lowest port number
as the master port and set all ports (including the master) in unselected state.
Place the ports that cannot aggregate with the master in unselected state, for
example, as the result of hardware restriction.
Manual aggregation limits the number of selected ports in an aggregation group. When
the limit is exceeded, the system changes the state of selected ports with greater port
numbers to unselected until the number of selected ports drops under the limit.
In addition, unless the master port should be selected, a port that joins the group after
the limit is reached will not be placed in selected state even if it should be in normal
cases. This is to prevent the ongoing service on selected ports from being interrupted.
You need to avoid the situation however as the selected/unselected state of a port may
become different after a reboot.
Note:
Currently, the number of the selected ports in a manual aggregation group created on
an S9500 routing switch can be up to eight.
III. Port Configuration Considerations in manual aggregation
As mentioned above, in a manual 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
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 can configure the link
aggregation port group corresponding to the link aggregation group. A link aggregation
port group is created upon creation of a link aggregation group to include all the ports in
the link aggregation group. The configuration made on a link aggregation port group
applies to all the ports in the group. For more information about link aggregation port
groups, refer to Link Aggregation Port
1-4
Chapter 1 Link Aggregation Overview
Aggregation.
Group.