Operation Manual – Link Aggregation
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
Link Aggregation Configuration
1-2
1.1.2 Introduction to LACP
The purpose of link aggregation control protocol (LACP) is to implement dynamic link
aggregation and deaggregation. This protocol is based on IEEE802.3ad and uses
LACPDUs (link aggregation control protocol data unit) to interact with its peer.
After LACP is enabled on a port, LACP notifies the following information of the port to its
peer by sending LACPDUs: priority and MAC address of this system, priority, number
and operation key of the port. Upon receiving the information, the peer compares the
information with the information of other ports on the peer device to determine the ports
that can be aggregated. In this way, the two parties can reach an agreement in
adding/removing the port to/from a dynamic aggregation group.
1.1.3 Operation Key
An operation key of an aggregation port is a configuration combination generated by
system depending on the configurations of the port (rate, duplex mode, other basic
configuration, and management key) when the port is aggregated.
1) The selected ports in a manual/static aggregation group have the same operation
key.
2) The management key of an LACP-enabled static aggregation port is equal to its
aggregation group ID.
3) The management key of an LACP-enabled dynamic aggregation port is zero by
default.
4) The member ports in a dynamic aggregation group must have the same operation
key.
1.1.4 Manual Aggregation Group
I. Introduction to manual aggregation group
A manual aggregation group is manually created. All its member ports are manually
added and can be manually removed (it inhibits the system from automatically
adding/removing ports to/from it). Each manual aggregation group must contain at least
one port. When a manual aggregation group contains only one port, you cannot remove
the port unless you remove the whole aggregation group.
LACP is disabled on the member ports of manual aggregation groups, and enabling
LACP on such a port will not take effect.
II. Port status in manual aggregation group
A port in a manual aggregation group can be in one of the two states: selected or
unselected. In a manual aggregation group, the selected ports can forward user service
packets, but the unselected ports cannot.
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