H3C S3100-52P Manuel utilisateur

Operation Manual – Link Aggregation

H3C S3100-52P Ethernet Switch Table of Contents

Table of Contents

Chapter 1 Link Aggregation Configuration ................................................................................1-1

1.1 Overview............................................................................................................................1-1

1.1.1 Introduction to Link Aggregation .............................................................................1-1

1.1.2 Introduction to LACP...............................................................................................1-1

1.1.3 Operation Key .........................................................................................................1-2

1.1.4 Manual Aggregation Group.....................................................................................1-2

1.1.5 Static LACP Aggregation Group.............................................................................1-3

1.1.6 Dynamic LACP Aggregation Group........................................................................ 1-4

1.1.7 Aggregation Group Categories ...............................................................................1-6

1.2 Link Aggregation Configuration .........................................................................................1-8

1.2.1 Configuring a Manual Aggregation Group ..............................................................1-8

1.2.2 Configuring a Static LACP Aggregation Group.......................................................1-9

1.2.3 Configuring a Dynamic LACP Aggregation Group................................................1-10

1.3 Displaying and Maintaining Link Aggregation Configuration........................................... 1-11

1.4 Link Aggregation Configuration Example........................................................................1-12

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H3C S3100-52P Ethernet Switch Chapter 1 Link Aggregation Configuration

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Chapter 1 Link Aggregation Configuration

1.1 Overview

1.1.1 Introduction to Link Aggregation

Link aggregation means aggregating several ports together to form an aggregation

group, so as to implement outgoing/incoming load sharing among the member ports in

the group and to enhance the connection reliability.

Depending on different aggregation modes, link aggregation falls into three types:

manual, static LACP, and dynamic LACP aggregations. Depending on whether or not

load sharing is implemented, aggregation groups can be load-sharing or

non-load-sharing aggregation groups.

For the member ports in an aggregation group, their basic configuration must be the

same. The basic configuration includes STP, QoS, VLAN, port attributes and other

associated settings.

zSTP configuration, including STP status (enabled or disabled), link attribute

(point-to-point or not), STP priority, path cost, standard packet format, maximum

packet transmission speed, loop prevention status, root protection status, edge

port or not.

zQoS configuration, including traffic limit, priority remarking, default 802.1p priority,

bandwidth assurance, congestion avoidance, traffic redirection, traffic statistics,

and so on.

zVLAN configuration, including permitted VLANs, and default VLAN ID.

zPort 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

LACPDUs (link aggregation control protocol data unit) to interact with its peer.

After LACPis enabled on a port, LACPnotifies 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.

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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.

The selected port with the smallest port number serves as the master port of the group,

and other selected ports serve as member ports of the group.

There is a limit on the number of selected ports in an aggregation group. Therefore, if

the number of the member ports serving as selected ports in an aggregation group

exceeds the maximum number supported by the device, the system will choose the

ports with lower port numbers as the selected ports, and set others as unselected ports.

In a manual aggregation group, the system sets the ports to selected or unselected

state by the following rules:

zThe system sets the "most preferred" ports (that is, the ports take most

precedence over other ports) to selected state, and others to unselected state.

Port precedence descends in the following order: full duplex/high speed, full

duplex/low speed, half duplex/high speed, half duplex/low speed.

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zThe system sets the ports unable to aggregate with the master port (due to some

hardware limit, for example, cross-board aggregation unavailability) to unselected

state.

zThe system sets the ports with port attribute configuration (rate, duplex mode, and

link type) different from that of the master port to unselected state.

III. Requirements on ports for manual aggregation

Generally, there is no limit on the rate and duplex mode of the ports (also including

initially DOWN port) you want to add to a manual aggregation group.After aggregation,

the smallest-numbered selected port is the master port of the aggregation group and

the other selected ports are the member ports of the aggregation group.

Note:

For an aggregation group:

zWhen the rate or duplex mode of a port in the aggregation group changes, packet

loss may occur on this port;

zWhen the rate of a port decreases, if the port belongs to a manual or static LACP

aggregation group, the port will be switched to the unselected state; if the port

belongs to a dynamic LACP aggregation group, deaggregation will occur on the

port.

1.1.5 Static LACP Aggregation Group

I. Introduction to static LACP aggregation

A static LACP aggregation group is also 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 static aggregation group must

contain at least one port. When a static aggregation group contains only one port, you

cannot remove the port unless you remove the whole aggregation group.

LACP is enabled on the member ports of static aggregation groups. When you remove

a static aggregation group, the system will remain the member ports of the group in

LACP-enabled state and re-aggregate the ports to form one or more dynamic LACP

aggregation groups. You must not disable LACP on static aggregation ports.

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II. Port status of static aggregation group

A port in a static aggregation group can be in one of the two states: selected or

unselected. In a static aggregation group, both the selected and the unselected ports

can transceive LACP protocol packets; the selected ports can transceive user service

packets, but the unselected ports cannot.

Note:

In an aggregation group, the selected port with the smallest port number serves as the

master port of the group, and other selected ports serve as member ports of the group.

In a static aggregation group, the system sets the ports to selected or unselected state

by the following rules:

zThe system sets the "most preferred" ports (that is, the ports take most

precedence over other ports) to selected state, and others to unselected state.

Port precedence descends in the following order: full duplex/high speed, full

duplex/low speed, half duplex/high speed, half duplex/low speed.

zThe system sets the state of the following ports to unselected: port connected to a

peer device different from the one the master port is connected to; port connected

to the same peer device as the master port but to a peer port that is not in the

same aggregation group as the peer port of the master port.

zThe system sets the ports unable to aggregate with the master port (due to some

hardware limit, for example, cross-board aggregation unavailability) to unselected

state.

zThe system sets the ports with basic port configuration different from that of the

master port to unselected state.

There is a limit on the number of selected ports in an aggregation group. Therefore, if

the number of the member ports that serves as selected ports in an aggregation group

exceeds the maximum number supported by the device, the system will choose the

ports with lower port numbers as the selected ports, and set others as unselected ports.

1.1.6 Dynamic LACP Aggregation Group

I. Introduction to dynamic LACP aggregation group

A dynamic LACP aggregation group is automatically created and removed by the

system. Users cannot add/remove ports to/from it. Aport can participate in dynamic link

aggregation only when it is LACP-enabled. Ports can be aggregated into a dynamic

aggregation group onlywhen they are connected to the same peerdevice and have the

same basic configuration (such as rate and duplex mode).

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Besides multiple-port aggregation groups, the system is also able to create single-port

aggregation groups, each of which contains only one port. LACP is enabled on the

member ports of dynamic aggregation groups.

II. Port status of dynamic aggregation group

A port in a dynamic aggregation group can be in one of the two states: selected or

unselected. In a dynamic aggregation group, both the selected and the unselected

ports can transceive LACP protocol packets; the selected ports can transceive user

service packets, but the unselected ports cannot.

Note:

In an aggregation group, the selected port with the smallest port number serves as the

master port of the group, and other selected ports serve as member ports of the group.

There is a limit on the number of selected ports in an aggregation group. Therefore, if

the number of the member ports that can be set as selected ports in an aggregation

group exceeds the maximum number supported by the device, the system will

negotiate with its peer end, to determine the states of the member ports according to

the port IDs of the preferred device (that is, the device with smaller system ID). The

following is the negotiation procedure:

1) Compare device IDs (system priority + system MAC address) between the two

parties. First compare the two system priorities, then the two system MAC

addresses if the system priorities are equal. The device with smaller device ID will

be considered as the preferred one.

2) Compare port IDs (port priority + port number) on the preferred device. The

comparison between two port IDs is as follows: First compare the two port

priorities, then the two port numbers if the two port priorities are equal; the port

with the smallest port ID is the selected port and the left ports are unselected ports.

III. Configuring system priority

LACP determines the selected and unselected states of the dynamic aggregation

group members according to the priority of the port ID on the end with the preferred

device ID.

The device ID consists of two-byte system priority and six-byte system MAC address,

that is, device ID = system priority + system MAC address.

When two device IDs are compared, the system priorities are compared first, and the

system MAC addresses are compared when the system priorities are the same. The

device with smaller device ID will be considered as the preferred one.

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Note:

Changing the system priority of a device may change the preferred device between the

two parties, and may further change the states (selected or unselected) of the member

ports of dynamic aggregation groups.

IV. Configuring port priority

LACP determines the selected and unselected states of the dynamic aggregation

group members according to the port IDs on the device with the preferred device ID.

When the number of members in an aggregation group exceeds the number of

selected ports supported by the device in each group, LACP determines the selected

and unselected states of the ports according to the port IDs. The ports with superior

port IDs will be set to selected state and the ports with inferior port IDs will be set to

unselected state.

The port ID consists of two-byte port priority and two-byte port number, that is, port ID =

port priority + port number. When two port IDs are compared, the port priorities are

compared first, and the port numbers are compared if the port priorities are the same.

The port with smaller port ID is considered as the preferred one.

1.1.7 Aggregation Group Categories

Depending on whether or not load sharing is implemented, aggregation groups can be

load-sharing or non-load-sharing aggregation groups. When load sharing is

implemented,

zFor IP packets, the system will implement load-sharing based on source IP

address and destination IP address;

zFor non-IP packets, the system will implement load-sharing based on source MAC

address and destination MAC address.

In general, the system only provides limited load-sharing aggregation resources

(currently N/2 load-sharing aggregation groups can be created at most, N is the number

of ports), so the system needs to reasonably allocate the resources among different

aggregation groups.

The system always allocates hardware aggregation resources to the aggregation

groups with higher priorities. When load-sharing aggregation resources are used up by

existing aggregation groups, newly-created aggregation groups will be

non-load-sharing ones.

Load-sharing aggregation resources are allocated to aggregation groups in the

following order:

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zAn aggregation group containing special ports (such as 10GE port) which require

hardware aggregation resources has higher priority than any aggregation group

containing no special port.

zA manual or static aggregation group has higher priority than a dynamic

aggregation group (unless the latter contains special ports while the former does

not).

zFor aggregation groups, the one that might gain higher speed if resources were

allocated to it has higher priority than others. If the groups can gain the same

speed, the one with smallest master port number has higher priority than other

groups.

When an aggregation group of higher priority appears, the aggregation groups of lower

priorities release their hardware resources. For single-port aggregation groups, they

can transceive packets normally without occupying aggregation resources

Caution:

A load-sharing aggregation group contains at least two selected ports, but a

non-load-sharing aggregation group can only have one selected port at most, while

others are unselected ports.

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1.2 Link Aggregation Configuration

Caution:

zThe commands of link aggregation cannot be configured with the commands of port

loopback detection feature at the same time.

zThe ports where the mac-address max-mac-count command is configured cannot

be added to an aggregation group. Contrarily, the mac-address max-mac-count

command cannot be configured on a port that has already been added to an

aggregation group.

zMAC-authentication-enabled ports and 802.1x-enabled ports cannot be added to an

aggregation group.

zMirroring destination ports and mirroring reflector ports cannot be added to an

aggregation group.

zPorts configured with blackhole MAC addresses, static MAC addresses or the static

ARP protocol cannot be added to the aggregation group.

zPorts where the IP-MAC address binding is configured cannot be added to an

aggregation group.

zPort-security-enabled ports cannot be added to an aggregation group.

1.2.1 Configuring a Manual Aggregation Group

You can create a manual aggregation group, or remove an existing manual aggregation

group (after that, all the member ports in the group are removed from the ports).

For a manual aggregation group, a port can only be manually added/removed to/from

the manual aggregation group.

Table 1-1 Configure a manual aggregation group

Operation Command Description

Enter system view system-view —

Create a manual

aggregation group link-aggregation group

agg-id mode manual Required

Configure a description

for the aggregation

group

link-aggregation group

agg-id description

agg-name

Optional

By default, an aggregation

group has no description.

Enter Ethernet port view interface interface-type

interface-number —

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Operation Command Description

Add the Ethernet port to

the aggregation group port link-aggregation

group agg-id Required

Note that:

1) When creating an aggregation group:

zIf the aggregation group you are creating already exists but contains no port, its

type will change to the type you set.

zIf the aggregation group you are creating already exists and contains ports, the

possible type changes may be: changing from dynamic or static to manual, and

changing from dynamic to static; and no other kinds of type change can occur.

zWhen you change a dynamic/static group to a manual group, the system will

automatically disable LACP on the member ports. When you change a dynamic

group to a static group, the system will remain the member ports LACP-enabled.

2) When a manual or static aggregation group contains only one port, you cannot

remove the port unless you remove the whole aggregation group.

1.2.2 Configuring a Static LACP Aggregation Group

You can create a static LACP aggregation group, or remove an existing static

aggregation group (after that, the system will re-aggregate the original member ports in

the group to form one or more dynamic aggregation groups.).

For a static aggregation group, a port can only be manually added/removed to/from the

static aggregation group.

Note:

When you add an LACP-enabled port to a manual aggregation group, the system will

automatically disable LACP on the port. Similarly, when you add an LACP-disabled

port to a static aggregation group, the system will automatically enable LACP on the

port.

Table 1-2 Configure a static LACP aggregation group

Operation Command Description

Enter system view system-view —

Create a static

aggregation group link-aggregation group

agg-id mode static Required

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