H3C S7500 Series Operating instructions

Brand: H3C

Model: S7500 Series

Type: Operating instructions

H3C S7500 Series offers robust networking solutions with its advanced Layer 2 and Layer 3 features. It facilitates efficient network management, enhances connectivity, and optimizes data transmission, making it ideal for various applications such as data centers, enterprise networks, and service provider networks. With its high-density ports, it enables flexible network configurations and supports diverse protocols and services. Experience enhanced network performance, reliability, and scalability with H3C S7500 Series.

Operation Manual – Link Aggregation

H3C S7500 Series Ethernet Switches 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...............................................................................................1-2

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 Restriction of LPU types on Link Aggregation ........................................................ 1-5

1.1.8 Aggregation Group Categories ...............................................................................1-7

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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Chapter 1 Link Aggregation Configuration

When configuring link aggregation, go to these sections for information you are

interested in:

z Overview

z Link Aggregation Configuration

z Displaying and Maintaining Link Aggregation Configuration

z Link Aggregation Configuration Example

1.1 Overview

1.1.1 Introduction to Link Aggregation

Link aggregation means aggregating several links 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, aggregation groups fall into three types:

manual, static LACP, and dynamic LACP. Depending on whether or not load sharing is

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

groups.

 Note:

Up to 384 aggregation groups can be created in a system, where up to 64 load-sharing

aggregation groups can be created.

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.

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

(point-to-point or non-point-to-point), STP priority, STP path cost, STP standard

packet format, maximum transmission speed, loop guard status, root guard status,

edge port or not.

z QoS configuration, including traffic rate limiting, priority marking, default 802.1p

priority, bandwidth assurance, congestion avoidance, traffic redirection, traffic

statistics, and so on.

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

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z 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.

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II. Port status in manual aggregation group

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

standby. The selected port with the minimum 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 ports that can be set 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 standby ports.

III. Requirements on ports for manual aggregation

Generally, there is no limit on the rate and duplex mode of the ports you want to add to

a manual aggregation group. However, note the following cases:

z For the ports which are initially down, there is no limit on the rate and duplex mode

of the ports when they are added to an aggregation group;

z For the currently down ports which used to be up and whose rate and duplex mode

are specified in the negotiation mode or mandatory mode, the rate and duplex

mode of each port must be the same as those of the selected ports in the manual

aggregation group;

z When the rate and duplex mode of a port in the manual aggregation group change,

the system does not deaggregate the aggregation group and all the ports in the

group work normally. However, if the rate of the master port decreases and the

duplex mode of the master port changes, packet loss may 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, and you cannot

disable LACP on such a port. 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.

II. Port status of static aggregation group

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

Both the selected and the standby ports can transceive LACP protocol packets

however, the standby ports cannot forward user packets.

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 Note:

In an aggregation group, the selected port with the minimum 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 standby state

according to the following rules:

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

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

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

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

z The system sets the state of the following ports to "standby": 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.

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

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

state.

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

master port to standby state.

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

the number of the member ports in an aggregation group exceeds the maximum

number supported by the device, the system will choose the member ports with lower

port numbers as the selected ports, and set others as standby ports.

 Note:

For the restriction of LPU types on link aggregation, refer to Table 1-2 and Table 1-3.

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. Ports can be aggregated into a

dynamic aggregation group only when they are connected to the same peer device and

have the same basic configuration, and the same rate and duplex mode.

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.

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II. Port status of dynamic aggregation group

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

standby. In a dynamic aggregation group, both the selected and the standby ports can

transceive LACP protocol packets; however, the standby ports cannot forward user

packets.

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

the number of the member 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 IDs of ports 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 system priority of the two devices. If the system

priorities are equal, compare the MAC address of the two systems. 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 smaller port ID is a selected port and the other port is a standby port.

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

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

 Note:

z The down ports in a static aggregation group or dynamic aggregation group are

standby ports, which is different in manual aggregation groups.

z For the restriction of LPU types on link aggregation, refer to Table 1-2 and Table

1-3.

1.1.7 Restriction of LPU types on Link Aggregation

Table 1-1 lists link aggregation types and related descriptions.

 Note:

Type-A LPUs include the following specifications: LS81FT48A, LS81FM24A,

LS81FS24A, LS81GB8UA and LS81GT8UA.

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Table 1-1 Link aggregation types and related descriptions

Aggregation

type

Basic

description

Specific description

Manual

aggregation

z For type-A LPUs, an aggregation group

supports up to 8 selected GE ports or 16

selected FE ports

z For non-type-A LPUs, an aggregation

group supports up to 8 selected GE ports

or 8 selected FE ports

Static/dynamic

aggregation

Support up to 384

aggregation

groups, including

64 load sharing

aggregation

groups

z For type-A LPUs, an aggregation group

supports up to 8 selected GE ports

z For type-A LPUs, an aggregation group

supports up to 24 FE ports, including up to

16 selected ones

z For non-type-A LPUs, an aggregation

group supports up to 48 ports, including

up to 8 selected ones

Table 1-2 and Table 1-3 describe the restriction of type-A LPUs and non-type-A LPUs

on link aggregation respectively.

Table 1-2 Restriction of type-A LPUs on link aggregation

LPU

type

Cross-chip

aggregation

Aggregation

type

LPU

specification

Maximum

number of

ports in an

aggregatio

n group

Maximum

number of

selected

ports in an

aggregatio

n group

LS81FT48A 16 16

LS81FM24A/

LS81FS24A

16 16

Manual

aggregation

LS81GB8UA/

LS81GT8UA

8 8

LS81FT48A 24 16

LS81FM24A/

LS81FS24A

24 16

Type-

LPU

Not

supported

Static/dynam

aggregation

LS81GB8UA/

LS81GT8UA

8 8

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Table 1-3 Restriction of non-type-A LPUs on link aggregation

LPU type

Cross-chip

aggregation

Aggregation

type

Maximum

number of

ports in an

aggregation

group

Maximum

number of

selected

ports in an

aggregation

group

Manual

aggregation

8 8

Non-type-A

LPU

Supported

Static/dynamic

aggregation

The number of

ports on the

LPU

1.1.8 Aggregation Group Categories

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

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

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

(currently up to 64 load-sharing aggregation groups can be created), 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.

The priorities of aggregation groups for allocating load-sharing aggregation resources

are as follows:

z An 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.

z A manual or static aggregation group has higher priority than a dynamic

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

not).

z For two aggregation groups, the one that might gain higher speed if resources

were allocated to it has higher priority than the other one.

z If the two groups can gain the same speed after resources are allocated to them,

the one with smaller master port number has higher priority than the other one.

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

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

can transceive packets normally without occupying aggregation resources, they will not

occupy hardware aggregation resources.

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Caution:

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

non-load-sharing aggregation group can have one selected port at most and others are

standby ports.

1.2 Link Aggregation Configuration

Caution:

z The following ports cannot be added to an aggregation group: destination ports to

be mirrored to, reflection ports of remote mirroring, ports configured with static MAC

addresses, static-ARP-enabled ports, and 802.1x-enabled ports.

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

aggregation group.

Note that:

1) When creating an aggregation group:

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

type will change to the type you set.

z If 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.

z When 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.

1.2.1 Configuring a Manual Aggregation Group

You can create a manual aggregation group through the following operations. And you

can remove an existing manual aggregation group. After that, all the ports in the group

are removed from the group).

A port can only be manually added/removed to/from a manual aggregation group.

Follow these steps to configure a manual aggregation group:

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To do… Use the command… Remarks

Enter system view

system-view

—

Create a manual

aggregation group

link-aggregation group

agg-id mode manual

Required

Add a group of ports to the

manual aggregation

group

link-aggregation

interface-type

interface-number to

interface-type

interface-number [ both ]

Optional

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-num

—

Add the port to the

aggregation group

port link-aggregation

group agg-id

Required

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 ports in the

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

A port can only be manually added/removed to/from a static aggregation group.

Follow these steps to configure a static LACP aggregation group:

To do… Use the command… Remarks

Enter system view

system-view

—

Create a static

aggregation group

link-aggregation group

agg-id mode static

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

—

Add the port to the

aggregation group

port link-aggregation

group agg-id

Required

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 Note:

For a static LACP aggregation group or a manual aggregation group, you are

recommended not to cross cables between the two devices at the two ends of the

aggregation group. For example, suppose port 1 of the local device is connected to port

2 of the peer device. To avoid cross-connecting cables, do not connect port 2 of the

local device to port 1 of the peer device. Otherwise, packets may be lost.

Note that:

z LACP cannot be enabled on a port in a manual aggregation group.

z You can add a LACP-enabled port to a manual aggregation group. In this case,

the system will disable LACP on the port automatically. And, when you add a

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

the port automatically.

1.2.3 Configuring a Dynamic LACP Aggregation Group

A dynamic LACP aggregation group is automatically created by the system based on

LACP-enabled ports. The adding and removing of ports to/from a dynamic aggregation

group are automatically accomplished by LACP.

You need to enable LACP on the ports whom you want to participate in dynamic

aggregation of the system, because, only when LACP is enabled on those ports at both

ends, can the two parties reach agreement in adding/removing ports to/from dynamic

aggregation groups.

 Note:

LACP cannot be enabled on a port of a manual aggregation group.

Follow these steps to configure a dynamic LACP aggregation group:

To do… Use the command… Remarks

Enter system view

system-view

—

Configure a description

for an aggregation group

link-aggregation group

agg-id description

agg-name

Optional

By default, an aggregation

group has no description.

Configure the system

priority

lacp system-priority

system-priority

Optional

By default, the system

priority is 32,768.

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To do… Use the command… Remarks

Enter Ethernet port view

interface interface-type

interface-number

—

Enable LACP on the port

lacp enable

Required

By default, LACP is

disabled on a port.

Configure the port priority

lacp port-priority

port-priority

Optional

By default, the port priority

is 32,768.

 Note:

If you use the save command to save the current configuration and then restart the

device, the configured manual/static aggregation groups and their descriptions still

exist, however, the dynamic aggregation groups will disappear and their descriptions

cannot be restored.

1.3 Displaying and Maintaining Link Aggregation

Configuration

To do… Use the command… Remarks

Display summary

information of all

aggregation groups

display link-aggregation

summary

Available in any

view

Display detailed

information of a specific

aggregation group

display link-aggregation verbose

agg-id

Available in any

view

Display the ID of the local

device

display lacp system-id

Available in any

view

Display link aggregation

details of a specified port

or port range

display link-aggregation

interface interface-type

interface-number | [ to

{ interface-type interface-number ]

Available in any

view

Clear LACP statistics

about a specified port or

port range

reset lacp statistics [ interface

interface-type interface-number [ to

interface-type interface-number ] ]

Available in user

view

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1.4 Link Aggregation Configuration Example

I. Network requirements

z Switch A connects to Switch B with three ports (Ethernet 2/0/1 through Ethernet

2/0/3). It is required that incoming/outgoing load between the two switch can be

shared among the three ports.

z Adopt three different aggregation modes to implement link aggregation on the

three ports between switch A and B.

II. Network diagram

Switch A

Link aggregation

Switch B

Figure 1-1 Network diagram for link aggregation configuration

III. Configuration procedure

The following only lists the configuration on Switch A; you must perform the similar

configuration on Switch B to implement link aggregation.

z Adopt the manual aggregation mode

# Create manual aggregation group 1.

<H3C> system-view

System View: return to User View with Ctrl+Z

[H3C] link-aggregation group 1 mode manual

# Add Ethernet 2/0/1 through Ethernet 2/0/3 to aggregation group 1.

[H3C] interface ethernet2/0/1

[H3C-Ethernet2/0/1] port link-aggregation group 1

[H3C-Ethernet2/0/1] interface ethernet2/0/2

[H3C-Ethernet2/0/2] port link-aggregation group 1

[H3C-Ethernet2/0/2] interface ethernet2/0/3

[H3C-Ethernet2/0/3] port link-aggregation group 1

z Adopt the static LACP aggregation mode

# Create static aggregation group 1.

[H3C] link-aggregation group 1 mode static

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# Add Ethernet 2/0/1 through Ethernet 2/0/3 to aggregation group 1.

[H3C] interface ethernet2/0/1

[H3C-Ethernet2/0/1] port link-aggregation group 1

[H3C-Ethernet2/0/1] interface ethernet2/0/2

[H3C-Ethernet2/0/2] port link-aggregation group 1

[H3C-Ethernet2/0/2] interface ethernet2/0/3

[H3C-Ethernet2/0/3] port link-aggregation group 1

z Adopt the dynamic LACP aggregation mode

# Enable LACP on Ethernet 2/0/1 through Ethernet 2/0/3.

<H3C> system-view

[H3C] interface Ethernet2/0/1

[H3C-Ethernet2/0/1] lacp enable

[H3C-Ethernet2/0/1] interface Ethernet2/0/2

[H3C-Ethernet2/0/2] lacp enable

[H3C-Ethernet2/0/2] interface Ethernet2/0/3

[H3C-Ethernet2/0/3] lacp enable

Note that the three LACP-enabled ports can be aggregated into a dynamic aggregation

group to implement load sharing only when they have the same basic configuration,

rate and duplex mode.

H3C S7500 Series Operating instructions

H3C S7500 Series Operating instructions

H3C S7500 Series Operating instructions

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