H3C S5820 series Configuration manual

Brand: H3C

Model: S5820 series

Type: Configuration manual

This manual is also suitable for

s5800 series

H3C S5820X&S5800 Series Ethernet Switches

IRF

Configuration Guide

Hangzhou H3C Technologies Co., Ltd.

http://www.h3c.com

Document Version: 6W103-20100716

Product Version: Release 1110

No part of this manual may be reproduced or transmitted in any form or by any means without prior

written consent of Hangzhou H3C Technologies Co., Ltd.

Trademarks

H3C, , Aolynk, , H

Care,

, TOP G, , IRF, NetPilot, Neocean, NeoVTL,

SecPro, SecPoint, SecEngine, SecPath, Comware, Secware, Storware, NQA, VVG, V

G, V

G, PSPT,

XGbus, N-Bus, TiGem, InnoVision and HUASAN are trademarks of Hangzhou H3C Technologies Co.,

Ltd.

All other trademarks that may be mentioned in this manual are the property of their respective owners.

Notice

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute the warranty of any kind, express or implied.

Preface

The H3C S5800&S5820X documentation set includes 11 configuration guides, which describe the

software features for the S5800&S5820X Series Ethernet Switches and guide you through the software

configuration procedures. These configuration guides also provide configuration examples to help you

apply software features to different network scenarios.

The IRF Configuration Guide describes how to use multiple S5800&S5820X switches to create an IRF

virtual device based on the IRF technology. It covers planning the switch roles in the IRF virtual device,

connecting the IRF link, and detecting and maintaining the IRF virtual device.

This preface includes:

z Audience

z Document Organization

z Conventions

z About the H3C S5820X&S5800 Documentation Set

z Obtaining Documentation

z Documentation Feedback

Audience

This documentation set is intended for:

z Network planners

z Field technical support and servicing engineers

z Network administrators working with the S5800 and S5820X series

Document Organization

The IRF Configuration Guide comprises the following part:

IRF Configuration

Conventions

This section describes the conventions used in this documentation set.

Command conventions

Convention Description

Boldface Bold text represents commands and keywords that you enter literally as shown.

italic

Italic text represents arguments that you replace with actual values.

[ ]

Square brackets enclose syntax choices (keywords or arguments) that are

optional.

{ x | y | ... }

Braces enclose a set of required syntax choices separated by vertical bars,

from which you select one.

[ x | y | ... ]

Square brackets enclose a set of optional syntax choices separated by vertical

bars, from which you select one or none.

Convention Description

{ x | y | ... } *

Asterisk marked braces enclose a set of required syntax choices separated by

vertical bars, from which you select at least one.

[ x | y | ... ] *

Asterisk marked square brackets enclose optional syntax choices separated by

vertical bars, from which you may select multiple choices or none.

&<1-n>

The argument or keyword and argument combination before the ampersand (&)

sign can be entered 1 to n times.

# A line that starts with a pound (#) sign is comments.

GUI conventions

Convention Description

Boldface

Window names, button names, field names, and menu items are in Boldface.

For example, the New User window appears; click OK.

Multi-level menus are separated by angle brackets. For example, File > Create

> Folder.

Symbols

Convention Description

Means reader be careful. Improper operation may cause data loss or damage to

equipment.

Means a complementary description.

About the H3C S5820X&S5800 Documentation Set

The H3C S5800&S5820X documentation set also includes:

Category Documents Purposes

Marketing brochures Describe product specifications and benefits.

Product description and

specifications

Technology white papers

Provide an in-depth description of software features

and technologies.

PSR150-A [ PSR150-D ]

Power Modules User

Manual

Describes the appearances, features, specifications,

installation, and removal of the pluggable 150W power

modules available for the products.

PSR300-12A

[ PSR300-12D1 ] Power

Modules User Manual

Describes the appearances, features, specifications,

installation, and removal of the pluggable 300W power

modules available for the products.

PSR750-A [ PSR750-D ]

Power Modules User

Manual

Describes the appearances, features, specifications,

installation, and removal of the pluggable 750W power

modules available for the products.

RPS User Manual

Describes the appearances, features, and

specifications of the RPS units available for the

products.

Pluggable module

description

LSW1FAN and

LSW1BFAN Installation

Manual

Describes the appearances, specifications,

installation, and removal of the pluggable fan modules

available for the products.

Category Documents Purposes

LSW148POEM Module

User Manual

Describes the appearance, features, installation, and

removal of the pluggable PoE module available for the

products.

S5820X [ S5800 ] Series

Ethernet Switches

Interface Cards User

Manual

Describes the models, hardware specifications,

installation, and removal of the interface cards

available for the products.

H3C OAP Cards User

Manual

Describes the benefits, features, hardware

specifications, installation, and removal of the OAP

cards available for the products.

H3C Low End Series

Ethernet Switches

Pluggable Modules

Manual

Describes the models, appearances, and

specifications of the pluggable modules available for

the products.

S5800-60C-PWR

Ethernet Switch Hot

Swappable Power

Module Ordering Guide

Guides you through ordering the hot-swappable power

modules available for the S5800-60C-PWR switches

in different cases.

Power configuration

RPS Ordering

Information for H3C

Low-End Ethernet

Switches

Provides the RPS and switch compatibility matrix and

RPS cable specifications.

z S5800 Series

Ethernet Switches

Quick Start

z S5820X Series

Ethernet Switches

Quick Start

z S5800 Series

Ethernet Switches

CE DOC

z S5820X Series

Ethernet Switches

CE DOC

Provides regulatory information and the safety

instructions that must be followed during installation.

z S5800 Series

Ethernet Switches

Quick Start

z S5820X Series

Ethernet Switches

Quick Start

Guides you through initial installation and setup

procedures to help you quickly set up and use your

device with the minimum configuration.

z S5800 Series

Ethernet Switches

Installation Manual

z S5820X Series

Ethernet Switches

Installation Manual

Provides a complete guide to hardware installation

and hardware specifications.

Hardware installation

Pluggable

SFP[SFP+][XFP]

Transceiver Modules

Installation Guide

Guides you through installing SFP/SFP+/XFP

transceiver modules.

Category Documents Purposes

z S5800-60C-PWR

Switch Video

Installation Guide

z S5820X-28C Switch

Video Installation

Guide

Shows how to install the H3C S5800-60C-PWR and

H3C S5820X-28C Ethernet switches.

Configuration guide

Describe software features and configuration

procedures.

Software configuration

Command reference Provide a quick reference to all available commands.

H3C Series Ethernet

Switches Login

Password Recovery

Manual

Tells how to find the lost password or recover the

password when the login password is lost.

Operations and

maintenance

Release notes

Provide information about the product release,

including the version history, hardware and software

compatibility matrix, version upgrade information,

technical support information, and software upgrading.

Obtaining Documentation

You can access the most up-to-date H3C product documentation on the World Wide Web at

http://www.h3c.com.

Click the links on the top navigation bar to obtain different categories of product documentation:

[Technical Support & Documents > Technical Documents] – Provides hardware installation, software

upgrading, and software feature configuration and maintenance documentation.

[Products & Solutions] – Provides information about products and technologies, as well as solutions.

[Technical Support & Documents > Software Download] – Provides the documentation released with

the software version.

Documentation Feedback

You can e-mail your comments about product documentation to [email protected].

We appreciate your comments.

Table of Contents

1 IRF Configuration ······································································································································1-1

IRF Overview ··········································································································································1-1

Introduction······································································································································1-1

Advantages······································································································································1-1

Application and Advantages············································································································1-2

Basic Concepts·······································································································································1-2

Working Process·····································································································································1-3

Physical Connections······················································································································1-4

Topology Collection·························································································································1-6

Role Election ···································································································································1-6

IRF Virtual Device Management ·····································································································1-7

IRF Multi-Active Detection (MAD) Mechanism··············································································1-10

IRF Virtual Device Configuration Task List···························································································1-11

IRF Virtual Device Configuration···········································································································1-12

Specifying a Domain ID for an IRF Virtual Device ········································································1-12

Setting a Member ID for a Device·································································································1-14

Configuring IRF Ports····················································································································1-15

Specifying a Priority for a Member································································································1-18

Specifying the Preservation Time of the Bridge MAC Address·····················································1-19

Enabling Auto Upgrade of Boot Files····························································································1-20

Setting the Delay Time for the Link Layer to Report a Link-Down Event······································1-20

Configuring MAD Detection ··················································································································1-21

Configuring LACP MAD·················································································································1-21

Configuring BFD MAD···················································································································1-23

Excluding a Port from the Shut Down Action upon Detection of Multi-Active Collision ················1-25

Manually Recovering an IRF Virtual Device··················································································1-26

Logging In to an IRF Virtual Device······································································································1-28

Logging In to the Master················································································································1-28

Logging In to a Slave·····················································································································1-28

Displaying and Maintaining an IRF Virtual Device················································································1-29

IRF Virtual Device Configuration Examples··························································································1-29

Configuration Example of Using the LACP MAD Detection··························································1-29

Configuration Example of Using the BFD MAD Detection····························································1-31

2 Index ···························································································································································2-1

1-1

1 IRF Configuration

This chapter includes these sections:

z IRF Overview

z Basic Concepts

z IRF Virtual Device Configuration Task List

z IRF Virtual Device Configuration

z Logging In to an IRF Virtual Device

z Displaying and Maintaining an IRF Virtual Device

z IRF Virtual Device Configuration Examples

You can establish an IRF virtual device by connecting switches of the same series, S5820X series or

S5800 series, or establish a mixed IRF virtual device that comprises both S5820X series and S5800

series switches.

IRF Overview

Introduction

Developed by H3C, Intelligent Resilient Framework (IRF) provides a new method to connect multiple

devices. Individual devices join to form a distributed device. IRF realizes the cooperation, unified

management, and non-stop maintenance of multiple devices.

Advantages

IRF features the following advantages:

z Streamlined management. When an IRF virtual device is established, you can log in to it by

connecting to any port of any member to manage all members of the IRF virtual device. Compared

with traditional methods of managing multiple devices, you do not need to connect to each

member physically, allocate an IP address to each member, interconnect the members, nor run

routing protocols on each member.

z High reliability. An IRF virtual device comprises multiple member devices: the master runs,

manages and maintains the IRF virtual device, whereas the slaves process services as well as

functioning as the backups. As soon as the master fails, the IRF virtual device immediately elects a

new master to prevent service interruption and implement 1:N backup. In addition, not only the IRF

links of members can be aggregated, but also the physical links between the IRF virtual device and

1-2

the upper or lower layer devices can be aggregated, and thus the reliability of the IRF virtual device

is increased through link backup.

z Powerful network expansion capability. By adding member devices, the number of IRF ports and

network bandwidth of the IRF virtual device can be easily expanded. Each member device has its

own CPU and they can independently process and forward protocol packets; therefore, the

processing capability of the IRF virtual device also can be easily expanded.

Application and Advantages

As shown in Figure 1-1, the master and a slave form an IRF virtual device, which is a single device to

the upper and lower layer devices.

Figure 1-1 IRF networking

IP network

IRF virtual device

IP network

IRF link

Equal to

Master

Slave

Basic Concepts

The IRF technology involves the following basic concepts:

Role

The devices that form an IRF virtual device are called IRF member devices. Each of them plays either

of the following two roles:

z Master: Manages the IRF virtual device.

z Slave: All members that operate as the backups of the master are called slaves. When the master

fails, the IRF virtual device automatically elects a new master from one of the slaves.

Master and slaves are elected through the role election mechanism. An IRF virtual device has only one

master at a time. Other members are the slaves. For the detailed role election process, refer to

Role

Election.

IRF port

An IRF port is a logical port dedicated to the internal connection of an IRF virtual device, which can be

numbered as IRF-port1 or IRF-port2. An IRF port is effective only when it is bound to a physical IRF

port.

1-3

Physical IRF port

Physical ports used for connecting members of an IRF virtual device are called physical IRF ports.

Typically, an Ethernet port or optical port forwards packets to the network. When bound to an IRF port,

it acts as a physical IRF port and forwards data traffic such as IRF-related negotiation packets and data

traffic among members.

For the detailed information of physical IRF ports on the S5820X and S5800 series switches, see

Physical Connections.

IRF virtual device merge

As shown in Figure 1-2, two IRF virtual devices operate independently and steadily. You can connect

them physically and perform necessary configurations to make them form one IRF virtual device. This

process is called IRF virtual device merge.

Figure 1-2 IRF virtual device merge

IRF virtual device partition

As shown in Figure 1-3, when an IRF virtual device is formed, the failure of the IRF link causes physical

disconnection between the two members, and then the IRF virtual device is divided into two IRF virtual

devices. This process is called IRF virtual device partition.

Figure 1-3 IRF virtual device partition

Member priority

Member priority determines the role of a member during a role election process. A member with a

higher priority is more likely to be a master. The priority of a device defaults to 1. You can configure the

priority at the command line interface (CLI).

Working Process

IRF virtual device management involves four stages: Physical Connections, Topology Collection, Role

Election

, and IRF Virtual Device Management. You need to connect the members of an IRF virtual

device physically, and then the members perform topology collection and role election. Finally, the IRF

virtual device can operate normally and enter the IRF virtual device management and maintenance

stage.

1-4

Physical Connections

Physical port

To make an IRF virtual device operate normally, physically connect the member devices. For the

S5820X and S5800 series switches, use SFP+ ports on the front panel or SFP+ ports on an interface

card as physical IRF ports.

For details of SFP+ ports and interface cards used on different device models, refer to H3C S5800

Series Ethernet Switches Installation Manual and H3C S5820X Series Ethernet Switches Installation

Manual.

When you use SFP+ ports, select SFP+ transceivers and optical fibers or SFP+ cables described in

Table 1-1 for connecting member devices.

Table 1-1 SFP+ transceivers and cables supported by the S5820X series and S5800 series

Transceiver/

Cable type

Transceiver/Cable

Central

wavelength

Connector Fiber

Max

transmission

distance

SFP-XG-SX-MM850-A 850 nm

50/125 µm

multimode

optical fiber

300 m (984.3

ft.)

SFP-XG-LX220-MM1310

62.5/125 µm

multimode

optical fiber

220 m (721.8

ft.)

10 GE SFP+

transceiver

SFP-XG-LX-SM1310

1310 nm

9/125 µm

single mode

optical fiber

10 km (about

6.2 mi)

LSWM1STK 0.65 m (2.1 ft.)

LSWM2STK 1.2 m (3.9 ft.)

Short-haul 10

GE SFP+

cable

LSWM3STK

— SFP+ SFP+ cable

3 m (9.8 ft.)

Use SFP+ transceivers with optical fibers when members are far from each other to increase network

flexibility; use SFP+ cables when members are all in one equipment room.

For the details of the interface modules, refer to H3C Low End Series Ethernet Switches Pluggable

Modules Manual.

Physical IRF ports can be used for connecting members and transmitting data traffic. To establish an

IRF virtual device, bind physical IRF ports to IRF ports.

Correspondence between an IRF port and a physical IRF port

The connection of IRF ports is based on that of physical IRF ports; therefore, bind an IRF port to

physical IRF port(s). An IRF port can be bound to one physical IRF port or, to back up links and expand

bandwidth, bound to multiple physical IRF ports (aggregated as an aggregate IRF port).

The following describes the correspondence between an IRF port and physical IRF port(s) on the

S5800 series and S5820X series:

1-5

Table 1-2 Correspondence between an IRF port and physical IRF port(s) for different device models

Device model Physical IRF port IRF port correspondence

S5800-60C-PWR

Physical IRF ports are provided on

the two interface cards on the front

panel.

All physical IRF ports bound to the same

IRF port must be located on the same

interface card.

z S5800-56C

z S5800-56C-PWR

z Four SFP+ ports are provided on

the front panel.

z Physical IRF ports are provided

on interface cards on the rear

panel.

All physical IRF ports bound to the same

IRF port must be located on the front

panel or on the interface card plugged in

the rear panel.

z S5800-32C

z S5800-32C-PWR

z Four SFP+ ports are provided on

the front panel.

z Physical IRF ports are provided

on interface cards on the rear

panel.

S5800-32F

z Four SFP+ ports are provided on

the front panel.

z The front panel can provide

physical IRF ports through

interface cards plugged in the

slots.

S5820X-28C

z The front panel can provide 14

SFP+ ports.

z Physical IRF ports are provided

on interface cards on the front

panel.

No location limitation to the physical IRF

ports bound to the same IRF port. Some

of the physical IRF ports can be located

on the front panel and some of them can

be located on interface cards.

S5820X-28S

24 SFP+ ports are provided on the

front panel.

No location limitation to the physical IRF

ports bound to the same IRF port.

Connection requirements

As shown in Figure 1-4, IRF-Port1 on one device can only be connected to the physical port bound to

IRF-Port2 of a neighbor device; otherwise, an IRF virtual device cannot be formed.

Figure 1-4 IRF physical connection

An IRF port can be bound to one physical IRF port or multiple physical IRF ports, thus to increase the

bandwidth and reliability of IRF links. You can bind at most four physical IRF ports to one IRF port on

the S5820X series or S5800 series.

1-6

IRF topology

An IRF virtual device typically adopts daisy chain connection or ring connection, as shown in Figure

1-5.

z A daisy chain connection is mainly used in a network where member devices are distributedly

located.

z A ring connection is more reliable than the daisy chain connection. In a daisy chained IRF virtual

device, the failure of one link can cause the IRF virtual device to partition into two independent IRF

virtual devices; where the failure of a link in a ring connection result in a daisy chain connection, not

affecting IRF services.

Figure 1-5 IRF connections

IRF virtual

device

Ring connection

Slave Slave

Master

IRF-Port1 IRF-Port2

IRF-Port1

IRF-Port2IRF-Port1

IRF-Port2

Daisy chain

connection

IRF

virtual

device

Master

Slave

IRF-Port2

IRF-Port1

Topology Collection

Each member exchanges hello packets with the directly connected neighbors to collect topology of the

IRF virtual device. The hello packets carry topology information, including IRF port connection states,

member IDs, priorities, and bridge MAC addresses.

Each member records its known topology information locally. At the initiation of the collection, the

members record their own topology information. When an IRF port of a member becomes up, the

member sends its known topology information from this port periodically. Upon receiving the topology

information, the directly connected neighbor updates the local topology information.

The collection process lasts for a period of time. When all members have obtained the complete

topology information (known as topology convergence), the IRF virtual device enters the next stage:

role election.

Role Election

The process of defining the role (master or slave) of members is role election.

Role election is held when the topology changes, such as, forming an IRF virtual device, adding a new

member, leaving or failure of the master, or IRF virtual device partition. The master is elected based on

1-7

the rules below, in the order specified. If the first rule does not apply, a second rule is tried, and so on,

until the only winner is found.

z The current master, even if a new member has a higher priority. (When an IRF virtual device is

being formed, all member devices consider themselves as the master, so this principle is skipped)

z A member with a higher priority.

z A member with the longest system up-time. (The system up-time information of each device is

delivered through IRF hello packets)

z A member with the lowest bridge MAC address.

Then, the IRF virtual device is formed and enters the next stage: IRF virtual device management and

maintenance.

z The precision of the system up-time is six minutes. For example, if two member devices with the

same priority values reboot one after another within six minutes, they have the same system

up-time and the last role election rule mentioned above is applied. In other words, the one with the

lowest bridge MAC address wins.

z Merge: The process of connecting two existing IRF virtual devices with cables. When two IRF

virtual devices are merged into one, an election is held, and members of the loser side reboot and

join the winner side as slaves.

z Partition: For an IRF virtual device, IRF link failure or power-off of a member causes physical

disconnection between two devices. The process is called IRF virtual device partition.

IRF Virtual Device Management

After role election, an IRF virtual device is established: all member devices operate as one virtual

device on the network, and all resources on the member devices are processed by this virtual device

and managed by the master.

Member ID

An IRF virtual device uses member IDs to uniquely identify and manage its members. For a device that

does not support IRF, an interface is named GigabitEthernet 1/0/1, where the first number is always 1;

for a device that supports IRF, if its member ID is 2, the name of the interface is GigabitEthernet 2/0/1,

where the first number indicates the member ID of the device.

A member ID is ranges from 1 to 10 and defaults to 1. To ensure the uniqueness of member IDs, plan

and configure member IDs before member devices join the IRF virtual device.

When multiple devices form an IRF virtual device, a logical distributed device is formed. Each member

device acts as a card on the distributed device. The master acts as the active main board (AMB), the

slaves act as the standby main boards (SMBs), and each member device also acts as an interface

board.

As shown in

Figure 1-6, an IRF virtual device comprises four members, which are numbered 1, 2, 3 and

4. When the IRF virtual device is established, it functions like a distributed device: slots 1,2, 3 and 4 are

1-8

inserted with cards, and each card has its own power supply unit (PSU), fan, CPU, console port and

Ethernet ports.

Figure 1-6 IRF virtual device

Interface name

For a device that operates independently (in other words, the device does not belong to any IRF virtual

device), its interface name is in the format of member ID/slot number/interface serial number, where:

z The default member ID is 1.

z When a device leaves an IRF virtual device, it retains its member ID.

z Subslot number is the number of the slot in which the interface card resides. On the S5820X series

or S5800 series, the subslot of the fixed port on the front panel is numbered 0; if the switch has only

one expansion slot, the subslot of this slot is numbered 1; if the switch has two expansion slots, the

subslots of the two expansion slots are numbered 1 and 2 from left to right.

z Interface serial number is dependent on the number of interfaces supported by the device. View

the silkscreen on the interface card for the number of supported interfaces.

For example, GigabitEthernet 1/0/1 is an interface on the independently operating device Sysname. To

set the link type of GigabitEthernet 1/0/1 to trunk, perform the following steps:

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] port link-type trunk

For a member of an IRF virtual device, the interface name also adopts the previously introduced format:

member ID/slot number/interface serial number, where

z The member ID identifies the IRF member on which the interface resides.

z Meaning and value of the subslot number and the interface serial number are the same as those

on an independently operating device.

For example, GigabitEthernet 1/0/1 is an interface on slave 3 (member ID is 3). To set the link type of

GigabitEthernet 1/0/1 to trunk, perform the following steps:

<Master> system-view

[Master] interface gigabitethernet 3/0/1

[Master-GigabitEthernet3/0/1] port link-type trunk

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File naming rules

You can use the name of a storage medium to access files on an independently operating device. For

the naming rules of a storage medium, see File Management Configuration in the Configuration

Fundamentals Configuration Guide.

To access the files of the master, use the name of the storage medium; to access files of a slave, use

the name in the following format: Member-ID#Storage-device-name.

For example:

1) To access the test folder in the root directory of the flash on the master, perform the following

steps:

<Master> mkdir test

...

%Created dir flash:/test.

<Master> dir

Directory of flash:/

0 -rw- 10105088 Apr 26 2000 13:44:57 test.app

1 -rw- 2445 Apr 26 2000 15:18:19 config.cfg

2 drw- - Jul 14 2008 15:20:35 test

30861 KB total (20961 KB free)

2) To create and access the test folder in the root directory of the flash on slave 3, perform the

following steps:

<Master> mkdir slot3#flash:/test

%Created dir slot3#flash:/test.

<Master> cd slot3#flash:/test

<Master> pwd

slot3#flash:/test

Or:

<Master> cd slot3#flash:/

<Master> mkdir test

%Created dir slot3#flash:/test.

3) To copy the test.app file on the master to the root directory of the flash on slave 3, perform the

following steps:

<Master> pwd

slot3#flash:

//The above information shows that the current working path is the root directory of the flash on slave 3.

<Master> cd flash:/

<Master> pwd

flash:

// The above operations show that the current working path is the root directory of the flash on the

master.

<Master> copy test.app slot3#flash:/

Copy flash:/test.app to slot3#flash:/test.app?[Y/N]:y

%Copy file flash:/test.app to slot3#flash:/test.app...Done.

Configuration file management

1) Configuration file synchronization

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IRF uses a strict configuration file synchronization mechanism to ensure that the members of an IRF

virtual device can work as a single device and that when the master fails, the other devices can operate

normally.

z When a slave starts up, it automatically searches for the master, synchronizes the master's

configuration file, and executes the configuration file. If all members start up simultaneously, the

slaves synchronize the master's initial configuration file and execute it.

z When the IRF virtual device operates normally, all your configurations are recorded into the current

configuration file of the master, and are synchronized to each member device. When you save the

current configuration file of the master as the startup configuration file by using the save command,

all slaves execute the same saving operation to make the startup configuration file of all members

consistent.

Through the real-time synchronization, all members keep the same configuration file. Even if the

master fails, all the other devices can execute various functions based on the same configuration file.

2) Configuration file application

The configuration file can be divided into two parts: global configuration and port configuration. When a

slave applies these two kinds of configurations of the master, it handles them as follows:

z Global configuration: All slaves execute the current global configuration on the master. In other

words, all members apply the same global configuration.

z Port configuration: When a slave applies the port configuration of the master, it cares about the

configuration related to its own port. For example, the slave with member ID 3 only cares about the

configuration related to the GigabitEthernet 3/0/x port on the master. If there is a configuration

related to its own port, it applies the configuration; if not, no matter what configuration has been

made to the port before the slave joins the IRF, the slave functions by using the default

configuration.

IRF topology maintenance

Direct neighbors of an IRF virtual device periodically exchange hello packets (the period is 200 ms).

Without receiving any hello packet from a direct neighbor for 100 periods, a member considers that the

hello packets timed out, and the expired device is isolated and the topology database is updated.

When an IRF port of a member is down, the member immediately broadcasts the information to all the

other members. If the IRF port of the master is down, an election is triggered.

IRF Multi-Active Detection (MAD) Mechanism

A link disconnection causes an IRF virtual device to divide into two or more IRF virtual devices with the

same global configuration, which may cause a network failure. Therefore, the multi-active detection

(MAD) mechanism is introduced to detect whether devices on the two sides of the detected link belong

to the same IRF virtual device and then judge whether the IRF virtual device is already partitioned into

multiple IRF virtual devices. The MAD mechanism provides the following functions:

z Detection: Enabled for an IRF virtual device, the MAD mechanism detects the network for multiple

active IRF virtual devices with the same global configuration. This is done with the Link

Aggregation Control Protocol (LACP) or the Bidirectional Forwarding Detection (BFD) protocol.

z Collision handling: When an IRF virtual device is partitioned, if multiple active IRF virtual devices

are detected, the MAD mechanism keeps only the one with the lowest master ID to operate

normally (keeping the active state). The state of all the other IRF virtual devices are set to recovery

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(disabled) and all physical ports (usually the service ports) in them are shut down except for the

reserved ones to make sure that these IRF virtual devices cannot forward data traffic.

z Failure recovery: An IRF link failure triggers IRF virtual device partition and thus causes

multi-active collision. In this case, repair the failed IRF link to make the collided IRF virtual devices

merge into one and the failure is recovered. If the IRF virtual device in the recovery state fails

before the failure is recovered, repair both the failed IRF virtual device and the failed IRF link, and

then the collided IRF virtual devices can merge into one and the failure is recovered. If the IRF

virtual device in the active state fails before the failure is recovered, enable the IRF virtual device in

the recovery state at the CLI to make it take over the active IRF virtual device and protect the

services from being affected. Then, recover the MAD failure.

z When an IRF virtual device is portioned, the system disables all service ports on the member

devices from the loser side (equal to executing the shutdown command on these ports). However,

some ports are not disabled and they are called reserved ports. By default, only physical IRF ports

can be set to reserved ports. To set other ports (such as the port for telnetting) to reserved ports,

configure them at the CLI.

z For configuration information about LACP, see Ethernet Link Aggregation Configuration in the

Layer 2 - LAN Switching Configuration Guide; for configuration information about BFD, see BFD

Configuration in the High Availability Configuration Guide.

IRF Virtual Device Configuration Task List

Before configuring an IRF virtual device, define the roles and functions of all the members. Because

some configurations takes effect after device reboot, you are recommended to follow the procedure

shown in

Figure 1-7.

Figure 1-7 IRF configuration flow chart

You can connect physical IRF ports with SFP+ cables or fibers after activating IRF port configurations.

After the device detects that the IRF ports are connected normally, role election is started immediately,

and then the elected slaves automatically reboot.

When an IRF virtual device is formed, you can configure and manage it by logging in to any member

device. The operations you make take effect on the master, and are applied to all member devices. For

1-12

easy fault location and device maintenance, the S5820X series or S5800 series provides slave view,

where you can execute the display, terminal, and debug commands.

Complete the following tasks to configure an IRF virtual device:

Task Remarks

Specifying a Domain ID for an IRF Virtual Device Optional

Setting a Member ID for a Device Optional

Configuring IRF Ports Required

Specifying a Priority for a Member Required

Specifying the Preservation Time of the Bridge MAC

Address

Optional

Enabling Auto Upgrade of Boot Files Optional

IRF Virtual Device

Configuration

Setting the Delay Time for the Link Layer to Report a

Link-Down Event

Optional

Connect the physical IRF ports of devices by using SFP+ cables or optical fibers (a ring connection is

recommended), and then power on the devices.

Configuring LACP MAD Optional

Configuring BFD MAD Optional

Excluding a Port from the Shut Down Action upon

Detection of Multi-Active Collision

Optional

Configuring MAD Detection

Manually Recovering an IRF Virtual Device Optional

Logging In to the Master Required

Logging In to an IRF Virtual

Device

Logging In to a Slave Optional

To avoid influence to your network caused by accidental partition of an IRF virtual device, you are

recommended to enable the MAD detection function after establishing the IRF virtual device.

IRF Virtual Device Configuration

Specifying a Domain ID for an IRF Virtual Device

Introduction to domain

To differentiate IRF virtual devices, each IRF virtual device is assigned a domain ID.

As shown in

Figure 1-8, Switch A and Switch B form IRF virtual device 1, and Switch C and Switch D

form IRF virtual device 2. If there is an LACP MAD detection link between IRF virtual device 1 and IRF

virtual device 2, they send MAD detection packets to each other through the detection link. In this case,

the system statuses and operations of both IRF virtual device 1 and IRF virtual device 2 are affected. To

solve this problem, specify different domain IDs for the two IRF virtual devices.

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Figure 1-8 Network diagram for multiple domains

Switch A Switch B

IRF virtual device 1

(domain 10)

IRF link

Core network

IRF virtual device 2

(domain 20)

IRF link

Switch C

Switch D

Access network

Assigning a domain ID to an IRF virtual device

If LACP MAD detection is applied for multiple IRF virtual devices and LACP MAD detection links exist

among the IRF virtual devices, assign different domain IDs for the IRF virtual devices. If there is no

LACP MAD detection link among IRF virtual devices, or BFD MAD detection is applied, you do not need

to assign domain IDs to them.

Follow these steps to assign a domain ID to an IRF virtual device:

To do… Use the command… Remarks

Enter system view

system-view

—

Assign a domain ID to an IRF

virtual device

irf domain

domain-id

Optional

By default, the domain ID of an

IRF virtual device is 0.

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H3C S5820 series Configuration manual

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Model: S5820 series

Type: Configuration manual

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