H3c-technologies H3C S5120 Series Switches User Manual download pdf (Page 101)

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z Class-two configurations made on an aggregate interface are automatically synchronized to all its

member ports. These configurations are retained on the member ports even after the aggregate

interface is removed.

z Any class-two configuration change may affect the aggregation state of link aggregation member

ports and thus ongoing traffic. To make sure that you are aware of the risk, the system displays a

warning message every time you attempt to change a class-two configuration setting on a member

port.

z Class-one configurations, which are configurations that do not affect the aggregation state of the

member port even if they are different from those on the aggregate interface. MSTP setting is

example of class-one configurations.

Reference port

When setting the aggregation state of the ports in an aggregation group, the system automatically picks

a member port as the reference. This port is called the reference port of the aggregation group. The port

attribute and class-two configurations of every other member port are compared with those of the

reference port.

LACP protocol

The IEEE 802.3ad Link Aggregation Control Protocol (LACP) enables dynamic aggregation of physical

links. It uses link aggregation control protocol data units (LACPDUs) for exchanging aggregation

information between LACP-enabled devices.

1) LACP functions

Based on the fields carried in LACPDUs, the functions delivered by the IEEE 802.3ad LACP fall into

basic LACP functions and extended LACP functions, as described in Table 1-2

Table 1-2 Basic and extended LACP functions

Category Description

Basic LACP functions

Implemented through the basic LACPDU fields including the system LACP

priority, system MAC address, port LACP priority, port number, and

operational key.

Each member port in a LACP-enabled aggregation group exchanges the

above information with its peer. When a member port receives an LACPDU,

it compares the received information with the information received on the

other member ports. In this way the two systems reach an agreement on

which ports should be placed in the selected state.

Extended LACP

functions

Implemented by extending the LACPDU with new Type/Length/Value (TLV)

fields.

This is how the LACP multi-active detection (MAD) mechanism of the

Intelligent Resilient Framework (IRF) feature is implemented.

Switches of the S5120-SI series that support extended LACP functions can

be used as intermediate devices in LACP MAD implementation

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