Operation Manual – Link Aggregation
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 Link Aggregation Overview
1-4
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.
III. Port Configuration Considerations in manual aggregation
As mentioned above, in a manual aggregation group, only ports with configurations
consistent with those of the reference port can become selected. These configurations
include port rate, duplex mode, link state, and other basic configurations, as described
in
Consistency Considerations for Ports in an Aggregation
.
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 manual 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.
1.2.2 Static LACP link aggregation
I. Overview
Static aggregations are created manually. After you add a port to a static aggregation,
LACP is enabled on it automatically.
II. Port states in static aggregation
In a static aggregation group, ports can be selected or unselected, where both can
receive and transmit LACPDUs but only selected ports can receive and transmit data
frames.
When setting the state of the ports in the local and remote static aggregation groups,
the local and remote systems do the following:
1) Compare their system IDs to identify the higher priority system. (The system ID
comprises LACP priority and system MAC address.)
z
First compare the system LACP priorities. The system with lower system LACP
priority wins out.
z
If the system LACP priorities are the same, compare the system MAC addresses.
The system with the smaller MAC address wins out.
2) Compare the port IDs on the higher priority system. (The port ID comprises port
LACP priority and port number.)
z
Compare the port LACP priorities. The port with lower port LACP priority wins out.
