Introduction To Lacp; Operation Key; Manual Aggregation Group - H3C S7500 Series Operation Manual

Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches
Port attribute configuration, including port rate, duplex mode, and link type (Trunk,
Hybrid or Access). The ports for a manual or static aggregation group must have
the same link type, and the ports for a dynamic aggregation group must have the
same rate, duplex mode and link type.

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
LACP data units (LACPDUs) 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, port priority, port
number and operation key of the port. After the peer port receives the information, the
peer collects the information received by all its ports and compares the information to
determine the ports that can be aggregated.

1.1.3 Operation Key

An operation key is a configuration combination generated by the system depending on
the configurations of the port (rate, duplex mode, 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 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 ports of manual aggregation groups, and you cannot enable
LACP on a port of a manual aggregation group.
Chapter 1 Link Aggregation Configuration
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