3Com Switch 8800 Configuration Guide Chapter 7 Link Aggregation Configuration
7-3
z The system sets to inactive state the active port connecting to the different peer
devices, or the port connecting to the same peer device but locating in the different
aggregation group.
z The system sets to inactive state the ports which cannot be aggregated with the
port, due to hardware limit (for example, trans-board aggregation is forbidden).
z The system sets to inactive state the ports with basic configurations different from
the active port.
Since only a defined number of ports can be added in an aggregation group, then if the
active ports in an aggregation group exceed the maximum threshold for that group, the
system shall set some ports with smaller port numbers (in ascending order) as active
ports and others as inactive ports. Both active and inactive ports can transceive LACP
protocol, but the inactive ports cannot forward user service packets.
II. Dynamic LACP aggregation
The system can create/delete automatically dynamic LACP aggregations, and you
cannot add/delete member ports into/from dynamic LACP aggregation. The system
can also aggregate one port, which is called single port aggregation. The dynamic
LACP aggregation LACP is in enabled state. The system can only aggregate the ports
with the same speed, duplex attribute, device connection, basic configuration.
Since only a defined number of ports can be added in an aggregation group, then if the
current member ports in an aggregation group exceed the maximum threshold for that
group, the system shall set some ports with smaller device ID (system priority + system
MAC address) and smaller port ID (port priority + port number) as active ports, and
others as inactive ports. If the maximum threshold is not exceeded, all member ports
are active ports. Both active and inactive ports can transceive LACP protocol, but the
inactive ports cannot forward user service packets. In an aggregation group, the active
port with the minimum port number serves as the master port, while others as slave
ports. When comparing device ID, the system compare system priority first, and then
system MAC address in the case of the same system priority. The smaller device ID is
regarded as higher priority. When comparing port ID, the system compares port priority
first, and then port number in the case of the same port priority. The smaller port ID is
regarded as higher priority. If the device ID changes to higher priority, the active and
inactive state of the member ports in an aggregation group depends on the device port
ID. You can also set system and port priority to define active and inactive ports.
7.1.4 Load Sharing I. Types of Load sharing
In terms of load balancing, link aggregation may be load balancing aggregation and
non-load balancing aggregation The Switch 8800 allocates IP packet load sharing
according to destination and source IP addresses. The switches allocate non-IP packet
load sharing according to source and destination MAC addresses. You can check