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Layer 2 - LAN Switching Configuration Guide
Hangzhou H3C Technologies Co., Ltd.
http://www.h3c.com
Software version: Release 2210
Document version: 6W100-20110915
H3C S5120-EI Switch Series
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Copyright © 2011, Hangzhou H3C Technologies Co., Ltd. and its licensors
All rights reserved
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
Notice
H3C,
, Aolynk, , H3Care,
SecPro, SecPoint, SecEngine, SecPath, Comware, Secware, Storware, NQA, VVG, V
, TOP G, , IRF, NetPilot, Neocean, NeoVTL,
2
G, VnG, 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
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.
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Preface
The H3C S5120-EI documentation set includes 10 configuration guides, which describe the software
features for the H3C S5120-EI Switch Series Release 2210, 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 Layer 2—LAN Switching Configuration Guide describes LAN switching fundamentals and
configuration. It describes how to implement flow control and load sharing, isolate uses in the same
VLAN, eliminate Layer 2 loops, and divide VLANs.
This preface includes:
• Audience
• New and changed features
• Conventions
• About the S5120-EI documentation set
• Obtaining documentation
• Technical support
• Documentation feedback
Audience
This documentation is intended for:
• Network planners
• Field technical support and servicing engineers
• Network administrators working with the S5120-EI Switch Series
New and changed features
This section describes the new and changed features in software release 2210 over release 2208 for the
S5120-EI switches.
Feature module New features Changed features
Ethernet interface
Loopback interface
and null interfaces
MAC address
management
Restoring the default settings of an
Ethernet port
Restoring the default settings of a
loopback or null interface
MAC address table: MAC address
roaming
N/A
N/A
N/A
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Feature module New features Changed features
• Restoring the default setting of an
aggregate interface
Ethernet link
aggregation
• Limiting the number of selected ports in
an aggregation group
N/A
• Assigning aggregation priority to
ports in a static aggregation group
Port isolation N/A N/A
Spanning tree
BPDU tunneling N/A N/A
• PVST
• TC snooping
N/A
Isolate-user-VLAN:
• Adding trunk ports to
isolate-user-VLANs or secondary
VLANs
• After you associate a secondary VLAN
with an isolate-user-VLAN, you can still
perform the following tasks:
VLAN
Common VLAN:
• Restoring the default settings of a
VLAN interface
• Setting the MTU of a VLAN interface
{ Adding/removing access ports
to/from the isolate-user-VLAN and
secondary VLAN
{ Deleting the isolate-user-VLAN or the
secondary VLAN
{ Using the isolated-vlan enable
command to enable Layer 2
isolation between the ports in the
secondary VLAN
{ Changing the promiscuous or host
mode of the ports in the VLANs
GVRP N/A N/A
QinQ N/A N/A
LLDP N/A N/A
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.
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Convention Description
[ x | y | ... ]
{ x | y | ... } *
[ x | y | ... ] *
&<1-n>
# A line that starts with a pound (#) sign is comments.
GUI conventions
Convention Description
Boldface
> Multi-level menus are separated by angle brackets. For example, File > Create > Folder.
Symbols
Convention Description
Square brackets enclose a set of optional syntax choices separated by vertical bars, from
which you select one or none.
Asterisk marked braces enclose a set of required syntax choices separated by vertical
bars, from which you select at least one.
Asterisk marked square brackets enclose optional syntax choices separated by vertical
bars, from which you select one choice, multiple choices, or none.
The argument or keyword and argument combination before the ampersand (&) sign can
be entered 1 to n times.
Window names, button names, field names, and menu items are in Boldface. For
example, the New User window appears; click OK.
WARNING
CAUTION
IMPORTANT
NOTE
TIP
Network topology icons
Port numbering in examples
The port numbers in this document are for illustration only and might be unavailable on your device.
An alert that calls attention to important information that if not understood or followed can
result in personal injury.
An alert that calls attention to important information that if not understood or followed can
result in data loss, data corruption, or damage to hardware or software.
An alert that calls attention to essential information.
An alert that contains additional or supplementary information.
An alert that provides helpful information.
Represents a generic network device, such as a router, switch, or firewall.
Represents a routing-capable device, such as a router or Layer 3 switch.
Represents a generic switch, such as a Layer 2 or Layer 3 switch, or a router that supports
Layer 2 forwarding and other Layer 2 features.
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About the S5120-EI documentation set
The H3C S5120-EI documentation set includes:
Documents Purposes
Product description and specifications
Marketing brochure Describe product specifications and benefits.
Technology white papers
Provide an in-depth description of software features and
technologies.
Hardware specifications and installation
Compliance and safety manual
CE DOCs
Installation quick start
Installation manual Provides a complete guide to switch installation and specifications.
RPS Ordering Information for H3C
Low-End Ethernet Switches
User manuals for RPSs Describe the specifications, installation, and replacement of RPSs.
User manuals for interface cards
H3C Low End Series Ethernet Switches
Pluggable Modules Manual
Pluggable SFP[SFP+][XFP] Transceiver
Modules Installation Guide
Provide regulatory information and the safety instructions that must be
followed during installation.
Guides you through initial installation and setup procedures to help
you quickly set up your device.
Helps you order RPSs for switches that can work with an RPS.
Describe the specifications, installation, and replacement of
expansion interface cards.
Describes the specifications of pluggable transceiver modules.
Describe the installation, and replacement of SFP/SFP+/XFP
transceiver modules.
Software configuration
Configuration guides Describe software features and configuration procedures.
Command references Provide a quick reference to all available commands.
Operations and maintenance
H3C Series Ethernet Switches Login
Password Recovery Manual
Release notes
Helps you deal with switch login password loss.
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]
upgrading, and software feature configuration and maintenance documentation.
[Products & Solutions]
.
– Provides information about products and technologies, as well as solutions.
– Provides hardware installation, software
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