Huawei Quidway S6500 Series Operation Manual page 57

Operation Manual - Port
Quidway S6500 Series Ethernet Switches
Chapter 2 Link Aggregation Configuration
2.1 Overview
2.1.1 Brief Introduction to Link Aggregation
Link aggregation means aggregating several ports together to implement the
outgoing/incoming payload balance among the member ports and enhance the
connection reliability. Link aggregation includes manual aggregation, dynamic LACP
aggregation and static LACP aggregation. In terms of load sharing, link aggregation
may be load sharing aggregation and non-load sharing aggregation.
For the member ports in an aggregation group, their basic configurations must be the
same. That is, if one is a trunk port, others must also be; when it turns into access port,
then others must change to access port.
Basic configuration includes STP setting, QoS setting, VLAN setting, and port setting.
The STP setting includes STP enabling/disabling, link attribute (point-to-point or
not), STP priority, path cost, max transmission speed, loop protection, root
protection, edge port or not.
The QoS setting includes traffic limiting, priority marking, default 802.1p priority,
bandwidth assurance, congestion avoidance, traffic redirection, traffic statistics.
The VLAN setting includes permitted VLAN types, default VLAN ID.
The port setting includes port speed, duplex mode and link type.
For the LS81FT48A, LS81FM24A, LS81FS24A, LS81GB8UA and LS81GT8UA cards,
each link aggregation contains a maximum of sixteen ports; For the other cards, each
link aggregation contains a maximum of eight ports.
For the 48-port 10/100Base-T auto-sensing fast Ethernet interface card, a port grouped
in first 24 ports cannot be aggregated with the one grouped in the last 24 ports.
2.1.2 Brief Introduction to LACP
IEEE802.3ad-based link aggregation control protocol (LACP) implements dynamic link
aggregation and disaggregation and exchanges information with the peer through
LACP data unit (LACPADU). When LACP is enabled on it, the port notifies, through
sending LACPDU, the peer of its system priority, system MAC, port priority, port number
and operation key. On receiving these types of information, the peer compares the
received information with that store at other ports to determine which ports can be
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Chapter 2 Link Aggregation Configuration