H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 131)

16-5
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 does not
perform load sharing. After hardware resources become depleted, link aggregation groups created
work in non-load sharing mode.
Load sharing is implemented through the selected ports in an aggregation group. However, the way of
selecting forwarding ports varies by packet type:
z
For a Layer-2 unicast packet with a known destination MAC address, if the packet carries an IP
datagram, the switch selects the forwarding port according to the source IP address and
destination IP address; otherwise, the switch selects the forwarding port according to the source
MAC address and destination MAC address.
z
For a unicast IP packet with a known destination IP address, the switch selects the forwarding port
according to the source IP address and the destination IP address of the packet.
z
For a Layer-2 multicast packet with a known destination MAC address, the switch selects the
forwarding port according to the source MAC address, the destination MAC address, and the
receiving port of the packet.
z
For a Layer-3 multicast packet with a known IP address, the switch selects the forwarding port
according to the source IP address, the destination IP address, and the receiving port of the
packet.
z
For an unknown unicast/multicast/broadcast packet, the switch selects the forwarding port
according to the source MAC address, the destination MAC address, and the receiving port of the
packet.
When only one selected port remains in a load sharing aggregation group, the group keeps working in
the load sharing mode.
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 reference 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 Port Correlation in H3C WX6103 Access Controller
Switch Interface Board Configuration Guide .