Linksys Smart Switch LGS3XX User manual

Smart Switch LGS3XX
User Guide

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Table of Contents
Linksys
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Chapter 1: Getting Started . . . . . . . . . . . . . . . . . . . . . 1
Starting the Web-based Conguration Utility . . . . . . . . . . . .1
Launching the Conguration Utility. . . . . . . . . . . . . . . . . . .1
Interface Naming Conventions . . . . . . . . . . . . . . . . . . . . . .3
Window Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Chapter 2: System Status . . . . . . . . . . . . . . . . . . . . . . 7
System Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
RMON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Chapter 3: Quick Start . . . . . . . . . . . . . . . . . . . . . . . .13
Chapter 4: System Management. . . . . . . . . . . . . . . . . .14
System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
System Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
SNTP Unicast Server. . . . . . . . . . . . . . . . . . . . . . . . . . . .19
SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Feature Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Log Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Remote Log Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
RAM Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Flash Memory Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Chapter 5: Port Management . . . . . . . . . . . . . . . . . . .30
Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Link Aggregation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
LAGs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Green Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
PoE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Feature Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Port Limit Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . .46
Class Limit Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . 47
Chapter 6: VLAN Management. . . . . . . . . . . . . . . . . . .49
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
VLANs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
VLAN Memberships . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Voice VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Feature Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Telephony Organizationally Unique Identier Interfaces . . . . 58
Chapter 7: Spanning Tree Management . . . . . . . . . . . . .61
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Table of Contents

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Table of Contents
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Spanning Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
STP Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
RSTP Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Chapter 8: MAC Address Management. . . . . . . . . . . . . .68
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Dynamic MAC Addresses . . . . . . . . . . . . . . . . . . . . . . . . 68
Chapter 9: Multicast . . . . . . . . . . . . . . . . . . . . . . . . .70
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Feature Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . 73
IGMP Snooping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Multicast Router Ports . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Forward All . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Unregistered Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . 78
IGMP IP Group Addresses . . . . . . . . . . . . . . . . . . . . . . . . 79
MAC Group Address FDB. . . . . . . . . . . . . . . . . . . . . . . . .80
IP Group Address FDB . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Chapter 10: IP Interface . . . . . . . . . . . . . . . . . . . . . . .84
IPv4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
IPv4 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
ARP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
IPv6 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
IPv6 Interface Addresses . . . . . . . . . . . . . . . . . . . . . . . . .89
IPv6 Default Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Chapter 11: IP Network Operations. . . . . . . . . . . . . . . .92
Domain Name System . . . . . . . . . . . . . . . . . . . . . . . . . . 92
DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
DHCP Snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
DHCP Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
DHCP Snooping Binding Database . . . . . . . . . . . . . . . . . . 99
Interface Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Chapter 12: Security . . . . . . . . . . . . . . . . . . . . . . . . 102
Management Security . . . . . . . . . . . . . . . . . . . . . . . . . 102
User Access & Accounts . . . . . . . . . . . . . . . . . . . . . . . . 102
RADIUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
Network Access Control . . . . . . . . . . . . . . . . . . . . . . . . 107
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
Feature Conguration . . . . . . . . . . . . . . . . . . . . . . . . . 112
Port Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Authenticated Hosts . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Port Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Storm Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116
Chapter 13: Quality of Service . . . . . . . . . . . . . . . . . . 118
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
Feature Conguration . . . . . . . . . . . . . . . . . . . . . . . . . 120
Queue Scheduling. . . . . . . . . . . . . . . . . . . . . . . . . . . .121
Bandwidth Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Basic QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Chapter 14: Maintenance . . . . . . . . . . . . . . . . . . . . . 127
Device Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Reboot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
File Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

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Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
Firmware & Boot Code . . . . . . . . . . . . . . . . . . . . . . . . . 131
Active Firmware Image . . . . . . . . . . . . . . . . . . . . . . . . .133
Conguration & Log. . . . . . . . . . . . . . . . . . . . . . . . . . .134
Conguration File Copy . . . . . . . . . . . . . . . . . . . . . . . . 136
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Optical Module Status . . . . . . . . . . . . . . . . . . . . . . . . . 137
Ping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Port Mirroring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

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CHAPTER 1 Getting Started
Linksys
1
CHAPTER 1 Getting Started
Getting Started
This section provides an introduction to the Web-based configuration utility, and
covers the following topics:
•Starting the Web-based Configuration Utility
•Interface Naming Conventions
•Window Navigation
•Configuring with Menu Command Line Interface
There are two ways to configure the device: through the graphical user interface
and through the menu command line interface.
Starting the Web-based Configuration Utility
This section describes how to navigate the Web-based switch configuration
utility. If you are using a pop-up blocker, make sure it is disabled.
The following browsers are supported:
•Firefox (versions 16 and latest)
•IE version (versions 9, 10)
Browser Restrictions
If you are using IPv6 interfaces on your management station, use the IPv6 global
address and not the IPv6 link local address to access the device from your browser.
Launching the Configuration Utility
To open the Web-based configuration utility, do the following:
STEP 1 Open a Web browser.
STEP 2 Enter the IP address of the device you are configuring in the address bar
on the browser, and then press Enter.
NOTE When the device is using the factory default IP address of 192.168.1.251,
its power LED flashes continuously. When the device is using a DHCP
assigned IP address or an administrator-configured static IP address, the
power LED is on solid.
Logging In
The default username is admin and the default password is admin
to log in to the Web-based GUI:
STEP 1 Open the GUI. The Login page is displayed.
STEP 2 Enter the username/password. The password can contain up to 64
ASCII characters.
Logging Out
By default, the application logs out after ten minutes of inactivity.Unless the
Running Configuration is copied to the Startup Configuration, rebooting the
device will remove all changes made since the last time the file was saved. Save
the Running Configuration to the Startup Configuration before logging off to
preserve any changes you made during this session.
Go to Configuration File Copy page to save your configuration. Save the Running
Configuration file by copying it to the Startup Configuration file.
To log out, click Logout in the top right corner of any page. The system logs out
of the device.
Interface Naming Conventions
When a timeout occurs or you intentionally log out of the system, a message
appears and the Login page appears, with a message indicating the logged-
out state.
To configure the device through the menu CLI, do the following:
1. Log on to the device through telnet.

CHAPTER 2 System Status
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6
To display Ethernet statistics and/or set the refresh rate, do the following:
STEP 1 Click System Status > Interface Statistics.
STEP 2 Enter the parameters.
System Status
Interface Statistics
•Interface—Select the specific interface for which Ethernet statistics are to
be displayed.
•Refresh Rate—Select the time period that passes before the interface
Ethernet statistics are refreshed. The available options are as follows:
•No Refresh—Statistics are not refreshed.
•15 Sec—Statistics are refreshed every 15 seconds.
•30 Sec—Statistics are refreshed every 30 seconds.
•60 Sec—Statistics are refreshed every 60 seconds.
The Receive Statistics area displays information about incoming packets.
•Unicast Packets—Good Unicast packets received.
•Multicast Packets—Good Multicast packets received.
•Broadcast Packets—Good Broadcast packets received.
•Error Packets—Packets with errors received.
The Transmit Statistics area displays information about outgoing packets.
•Total Octets—Octets transmitted, including bad packets and FCS octets,
but excluding framing bits.
•Unicast Packets—Good Unicast packets transmitted.
•Multicast Packets—Good Multicast packets transmitted.
•Broadcast Packets—Good Broadcast packets transmitted.
•To clear or view statistics counters, do the following:
•Click Refresh to refresh the counters on the page.
•Click Clear to clear the selected interfaces counters.
•Click View All to see all ports on a single page.

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CHAPTER 1 Getting Started
Linksys
Button Name Description
Close Click to return to the previous page. Any changes
not applied are cleared.
Clear All Click to clear the statistic counters for all interfaces.
Clear Click to clear information, such a counters of an
interface or all interface, or log files.
Delete After selecting an entry in the table, click Delete
to remove.
Edit Select the entry and click Edit. The Edit page
appears, and the entry can be modified.
1. Click Apply to save the changes to the Running
Configuration.
2. Click Close to return to the main page.
Search Enter the query filtering criteria and click Search.
The results are displayed on the page.
Refresh Click Refresh to refresh the counter values.
Test Click Test to perform the related tests.
View or View All Click View to display details associated with the
entry selected or for all entries (respectively).

CHAPTER 2 System Status
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CHAPTER 2 System Status
System Status
This section describes how to view device statistics. It covers the following
topics:
•System Summary
•RMON
•Interface Statistics
System Summary
The System Summary page provides a graphic view of the device, and displays
device status, hardware information, firmware version information, general PoE
status, and other items.
To view system information, click System Status > System Summary. The System
Summary page contains system and hardware information.
•System Mode—Specifies whether the system is operating in Layer 2
system mode.
•System Description—A description of the system.
•System Location—Physical location of the device. Click Edit to go the System
Information page to enter this value.
•System Contact—Name of a contact person. Click Edit to go the System
Information page to enter this value.
•Host Name—Name of the device. By default, the device host name is
composed of the word “switch” followed by the three least significant bytes
of the device base MAC address (the six furthest right hexadecimal digits).
•Base MAC Address—Device MAC address.
•SNMP Object ID—Unique vendor identification of the network
management subsystem.
•Firmware Version—Firmware version number.
•Boot Code Version—Boot version number.
•Hardware Version —Hardware version number of the device.
•Serial Number—Serial number. Device Status
•Fan Status—Applicable only to models that have fans. The following values
are possible:
•OK—Fan is operating normally.
•Fail—Fan is not operating correctly.
•Date & Time—System date and time.
•System Uptime—Length of time since last reboot.

CHAPTER 2 System Status
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5
RMON
The Statistics page displays detailed information regarding packet sizes and
information regarding physical layer errors. The information displayed is
according to the RMON (Remote Network Monitoring) standard. An oversized
packet is defined as an Ethernet frame with the following criteria:
•Packet length is greater than MRU byte size.
•Collision event has not been detected.
•Late collision event has not been detected.
•Received (Rx) error event has not been detected.
•Packet has a valid CRC.
To view RMON statistics and/or set the refresh rate, do the following:
STEP 1 Click System Status > RMON > Statistics.
STEP 2 Select the Interface for which statistics are to be displayed.
STEP 3 Select the Refresh Rate, the time period that passes before the interface
statistics are refreshed.
The statistics are displayed for the selected interface.
•Bytes Received—Number of octets received, including bad packets and FCS
octets, but excluding framing bits.
•Drop Events—Number of packets dropped.
•Packets Received—Number of good packets received, including Multicast
and Broadcast packets.
•Broadcast Packets Received—Number of good Broadcast packets received.
This number does not include Multicast packets.
•Multicast Packets Received—Number of good Multicast packets received.
•CRC & Align Errors—Number of CRC and Align errors that have occurred.
•Undersize Packets—Number of undersized packets (less than 64 octets)
received.
•Oversize Packets—Number of oversized packets (over 2000 octets) received.
•Fragments—Number of fragments (packets with less than 64 octets,
excluding framing bits, but including Frame Check Sequence octets)
received.
•Jabbers—Total number received packets that were longer than 1632
octets. This number excludes frame bits, but includes FCS octets that had
either a bad FCS with an integral number of octets (FCS Error) or a bad FCS
with a non-integral octet (Alignment Error) number. A jabber packet is
defined as an Ethernet frame that satisfies the following criteria:
•Packet data length is greater than MRU.
•Packet has an invalid CRC.
•Received (Rx) Error Event has not been detected.
•Collisions—Number of collisions received. If Jumbo Frames are enabled,
the threshold of Jabber Frames is raised to the maximum size of Jumbo
Frames.
•Frames of 64 Bytes—Number of frames, containing 64 bytes that were
received.
•Frames of 65 to 127 Bytes—Number of frames, containing 65-127 bytes
that were received.
•Frames of 128 to 255 Bytes—Number of frames, containing 128-255 bytes
that were received.
•Frames of 256 to 511 Bytes—Number of frames, containing 256-511 bytes
that were received.
•Frames of 512 to 1023 Bytes—Number of frames, containing 512-1023
bytes that were received.
•Packets of 1024 and More Bytes—Number of frames, containing 1024-
2000 bytes, and Jumbo Frames, that were received.
To clear or view statistics counters, do the following:
•Click Refresh to refresh the counters on the page.
•Click Clear to clear the selected interfaces counters.
•Click View All to see all ports on a single page.
Interface Statistics
The Interface Statistics page displays traffic statistics per port. The refresh rate of
the information can be selected.
This page is useful for analyzing the amount of traffic that is both sent and
received and its dispersion (Unicast, Multicast, and Broadcast).

CHAPTER 2 System Status
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6
To display Ethernet statistics and/or set the refresh rate, do the following:
STEP 1 Click System Status > Interface Statistics.
STEP 2 Enter the parameters.
Interface Statistics
•Interface—Select the specific interface for which Ethernet statistics are to
be displayed.
•Refresh Rate—Select the time period that passes before the interface
Ethernet statistics are refreshed. The available options are as follows:
•No Refresh—Statistics are not refreshed.
•15 Sec—Statistics are refreshed every 15 seconds.
•30 Sec—Statistics are refreshed every 30 seconds.
•60 Sec—Statistics are refreshed every 60 seconds.
The Receive Statistics area displays information about incoming packets.
•Unicast Packets—Good Unicast packets received.
•Multicast Packets—Good Multicast packets received.
•Broadcast Packets—Good Broadcast packets received.
•Error Packets—Packets with errors received.
The Transmit Statistics area displays information about outgoing packets.
•Total Octets—Octets transmitted, including bad packets and FCS octets,
but excluding framing bits.
•Unicast Packets—Good Unicast packets transmitted.
•Multicast Packets—Good Multicast packets transmitted.
•Broadcast Packets—Good Broadcast packets transmitted.
•To clear or view statistics counters, do the following:
•Click Refresh to refresh the counters on the page.
•Click Clear to clear the selected interfaces counters.
•Click View All to see all ports on a single page.

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Chapter 3 Quick Start
Linksys
7
Chapter 3 Quick Start
Quick Start
This section describes how to view device statistics.
To simplify device configuration through quick navigation, the Quick Start
page provides links to the most commonly used pages.
Link Name (on the Page) Linked Page
Configure User Accounts and
Management Access
User Access & Accounts
Configure Device IP Address IPv4 Interface
Create VLANs VLANs
Configure VLAN Memberships VLAN Memberships
Save Your Configuration Configuration File Copy

8
Chapter 4 System Management
Linksys
Chapter 4 System Management
System Management
This chapter describes the following topics:
• SystemInformation
• Time
• SNMP
• Logs
System Information
To enter system information, do the following:
STEP 1 Click Configuration > System Management > System Information.
STEP 2 View or modify the system settings.
•System Description—Displays a description of the device.
•System Location—Enter the location where the device is physically located.
•System Contact—Enter the name of a contact person.
•System Host Name—Select the host name of this device.
•Default—The default host name (System Name) of these switches is
switch123456, where 123456 represents the last three bytes of the device
MAC address in hex format.
•User Defined—Enter the host name. Use only letters, digits, and hyphens.
Host names cannot begin or end with a hyphen. No other symbols,
punctuation characters, or blank spaces are permitted (as specified in
RFC1033, 1034, 1035).
STEP 3 Click Apply to save the values in the Running Configuration file.
Time
This section describes the options for configuring the system time, time zone,
and Daylight Savings Time (DST). It covers the following topics:
•Overview
•System Time
•SNTP Unicast Server
Overview
Synchronized system clocks provide a frame of reference between all devices on
the network. Network time synchronization is critical because every aspect of
managing, securing, planning, and debugging a network involves determining
when events occur. Without synchronized clocks, accurately correlating log
files between devices when tracking security breaches or network usage is
impossible.
Synchronized time also reduces confusion in shared file systems, as it is
important for the modification times to be consistent, regardless of the
machine on which the file systems reside.
For these reasons, it is important that the time configured on all of the devices
on the network is accurate.

9
Chapter 4 System Management
Linksys
NOTE The device supports Simple Network Time Protocol (SNTP) and when
enabled, the device dynamically synchronizes the device time with
time from an SNTP server. The device operates only as an SNTP client,
and cannot provide time services to other devices.
System time can be set manually by the user or dynamically from an SNTP
server. If an SNTP server is chosen, the manual time settings are overwritten
when communications with the server are established.
As part of the boot process, the device always configures the time, time zone,
and DST. These parameters are obtained from SNTP, values set manually, or, if
all else fails, from the factory defaults.
Time Configuration Methods
The following methods are available for setting the system time on the device:
•Manual—You must manually set the time.
•SNTP—Time can be received from SNTP time servers. SNTP ensures
accurate network time synchronization of the device up to the millisecond
by using an SNTP server for the clock source. When specifying an SNTP
server, if choosing to identify it by host name, three suggestions are given
in the GUI:
•time-a.timefreq.bldrdoc.gov
•time-b.timefreq.bldrdoc.gov
•time-c.timefreq.bldrdoc.gov
After the time has been set by any of the above sources, it is not set again by
the browser.
NOTE SNTP is the recommended method for time setting.
Time Zone and Daylight Savings Time (DST)
The Time Zone and DST can be set on the device in the following ways:
•Dynamic configuration of the device through a DHCP server, as follows:
•Dynamic DST, when enabled and available, always takes precedence
over the manual configuration of DST.
•If the server supplying the source parameters fails, or dynamic
configuration is disabled by the user, the manual settings are used.
•Dynamic configuration of the time zone and DST continues after the IP
address lease time has expired.
•Manual configuration of the time zone and DST becomes the Operational
time zone and DST, only if the dynamic configuration is disabled or fails.
NOTE The DHCP server must supply DHCP option 100 in order for dynamic
time zone configuration to take place.
SNTP Modes
The device can receive the system time from an SNTP server in one of the
following ways:
•Client Multicast/Anycast Reception (passive mode)SNTP servers broadcast
the time, and the device listens to these Multicast/Anycast transmissions.
When the device is in this mode, there is no need to define a Unicast SNTP
server.
•Client Multicast/Anycast Transmission (active mode)—The device, as an
SNTP client, periodically requests SNTP time updates. This mode works in
either of the following ways:
•SNTP Anycast Client Mode—The device broadcasts time request packets
to all SNTP servers in the subnet, and waits for a response.
•Unicast SNTP Server Mode—The device sends Unicast queries to a list of
manually-configured SNTP servers, and waits for a response.The device
supports having all of the above modes active at the same time and selects
the best system time received from an SNTP server, according to an algorithm
based on the closest stratum (distance from the reference clock).
System Time
Use the System Time page to select the system time source. If the source is
manual, you can enter the time here.
CAUTION If the system time is set manually and the device is rebooted, the
manual time settings must be reentered.
To define system time, do the following:
STEP 1 Click Configuration > System Management > Time > System Time.
The current time on the device is displayed. This shows the DHCP time zone or
the acronym for the user-defined time zone if these were defined.

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STEP 2 Enter these parameters:
Clock Source—Select the source used to set the system clock.
•SNTP—If you enable this, the system time is obtained from an SNTP server.
To use this feature, you must also configure a connection to an SNTP server
in the SNTP Unicast Server page.
•SNTP Client Unicast—Select to enable client Unicast mode.
•SNTP IPv4 Multicast Rx—Select to receive SNTP IPv4 Multicast
synchronization packets requesting system time information. The packets
are transmitted to all SNTP servers on the subnet.
•SNTP IPv4 Anycast Tx—Select to transmit SNTP IPv4 Anycast
synchronization packets requesting system time information. The packets
are transmitted to all SNTP servers on the subnet.
•SNTP IPv6 Multicast Rx—Select to receive SNTP IPv6 Multicast
synchronization packets requesting system time information. The packets
are transmitted to all SNTP servers on the subnet.
•SNTP IPv6 Anycast Tx—Select to transmit SNTP IPv6 Anycast
synchronization packets requesting system time information. The packets
are transmitted to all SNTP servers on the subnet.
•Manual Date/Time—Set the date and time manually. The local time is used
when there is no alternate source of time, such as an SNTP server.Time
Zone—The local time is used via the DHCP server or Time Zone offset.
•Time Zone from DHCP—Select to enable dynamic configuration of the
time zone and the DST from the DHCP server.Whether one or both of these
parameters can be configured depends on the information found in the
DHCP packet. If this option is enabled, you must also enable DHCP client
on the device. The DHCP Client supports Option 100 providing dynamic
time zone setting.
•DHCP Time Zone—Displays the acronym of the time zone configured from
the DHCP server. This acronym appears in the Actual Time field.
•Time Zone Offset—Select the difference in hours between Greenwich
Mean Time (GMT) and the local time. For example, the Time Zone Offset
for Paris is GMT +1, while the Time Zone Offset for New York is GMT – 5.
•Time Zone Acronym—Enter a user-defined name that represents the time
zone you have configured. This acronym appears in the Actual Time field.
•Daylight Savings Time—Select how DST is defined:
•Daylight Savings — Select to enable Daylight Saving Time.
•Time Set Offset—Enter the number of minutes offset from GMT ranging
from1—1440. The default is 60.
•Daylight Savings Type—Click one of the following:
•USA — DST is set according to the dates used in the USA.
•European — DST is set according to the dates used by the European
•Union and other countries that use this standard.
•By Dates — DST is set manually, typically for a country other than the USA
or a European country. Enter the following parameters:
•Selecting By Dates allows customization of the start and stop of DST:
•From — Day and time that DST starts.
•To — Day and time that DST ends.
•Recurring — DST occurs on the same date every year.
Selecting Recurring allows different customization of the start and stop of DST:
•From — Date when DST begins each year.
•Day — Day of the week on which DST begins every year.
•Week — Week within the month from which DST begins every year.
•Month — Month of the year in which DST begins every year.
•Time — The time at which DST begins every year.
•To — Date when DST ends each year. For example, DST ends locally every
fourth Friday in October at 5:00 am. The parameters are as follows:
•Day — Day of the week on which DST ends every year.
•Week — Week within the month from which DST ends every year.
•Month—Month of the year in which DST ends every year.
•Time—The time at which DST ends every year.
STEP 3 Click Apply. The system time values are written to the Running
Configuration file.

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SNTP Unicast Server
Up to 16 Unicast SNTP servers can be configured.
NOTE To specify a Unicast SNTP server by name, you must first configure
DNS server(s) on the device (see DNS Settings). To add a Unicast SNTP
server, SNTP Client Unicast must be enabled.
To add a Unicast SNTP server:
STEP 1 Click Configuration > Time > SNTP Unicast Server.
This page displays the following information for each configured Unicast
SNTP server:
•SNTP Server — SNTP server IP address. The preferred server, or host name,
is chosen according to its stratum level.
•SNTP Server Status—SNTP server status. The possible values are as follows:
•Up — SNTP server is currently operating normally.
•Down — SNTP server is currently not available.
•Unknown — SNTP server is currently being searched for by the device.
•In Process — Occurs when the SNTP server has not fully trusted its own
time server (i.e. when first booting up the SNTP server).
•Stratum Level—Distance from the reference clock expressed as a numerical
value. An SNTP server cannot be the primary server (stratum level 1) unless
polling interval is enabled.
•Offset—The estimated offset of the server’s clock relative to the local clock,
in milliseconds. The host determines the value of this offset using the
algorithm described in RFC 2030.
•Delay—The estimated round-trip delay of the server’s clock relative to the
local clock over the network path between them, in milliseconds. The host
determines the value of this delay using the algorithm described in RFC
2030.
•Poll Interval—Displays whether polling is enabled or disabled.
•Last Response Time—Date and time of the last time a response was
received from this SNTP server.
STEP 2 Click Add.
STEP 3 Enter the following parameters:
•SNTP Server—Select if the SNTP server is going to be identified by its IP
address or if you are going to select a well-known SNTP server by name
from the list.
NOTE To specify a well-known SNTP server, the device must be connected to
the Internet and configured with a DNS server or configured so that a
DNS server is identified by using DHCP. (See DNS Settings)
•IP Version—Select the version of the IP address: Version 4 or Version 6.
•IPv6 Address Type—Select the IPv6 address type (if IPv6 is used). The
options are
•Global—The IPv6 address is a global Unicast IPV6 type that is visible and
reachable from other networks.
•Link Local—The IPv6 address uniquely identifies hosts on a single network
link. A link local address has a prefix of FE80, is not routable, and can be
used for communication only on the local network. Only one link local
address is supported. If a link local address exists on the interface, this
entry replaces the address in the configuration.
•Interface—Select the link local interface (if IPv6 Address Type Link Local is
selected) from the list.
•SNTP Server IP Address—Enter the SNTP server IP address. The format
depends on which address type was selected.
•SNTP Server Name—Select the name of the SNTP server from a list of well-
known NTP servers. If other is chosen, enter name of SNTP server in the
adjacent field.
•Poll Interval—Select to enable polling of the SNTP server for system time
information. All NTP servers that are registered for polling are polled, and
the clock is selected from the server with the lowest stratum level (distance
from the reference clock) that is reachable. The server with the lowest
stratum is considered to be the primary server. The server with the next
lowest stratum is a secondary server, and so forth. If the primary server
is down, the device polls all servers with the polling setting enabled, and
selects a new primary server with the lowest stratum.
STEP 4 Click Apply. The STNP server is added, and you are returned to the
main page.

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SNMP
This section describes the Simple Network Management Protocol (SNMP)
feature that provides a method for managing network devices. SNMP v1/v2 are
supported. It covers the following topics:
• Overview
• FeatureConfiguration
Overview
The following are the device model Object IDs (OIDs).
Mode Name Description Object ID
LGS308 8-Port Smart Gigabit Switch enterprises(1).linksys(3955).
smb(1000).3.8.1
LGS318 16-Port Smart Gigabit
Switch
enterprises(1).linksys(3955).
smb(1000).3.18.1
LGS326 24-Port Smart Gigabit
Switch
enterprises(1).linksys(3955).
smb(1000).3.26.1
LGS308P 8-Port Smart Gigabit PoE
Switch
enterprises(1).linksys(3955).
smb(1000).3.8.2
LGS318P 16-Port Smart Gigabit PoE
Switch
enterprises(1).linksys(3955).
smb(1000).3.18.2
LGS326P 24-Port Smart Gigabit PoE
Switch
enterprises(1).linksys(3955).
smb(1000).3.26.2
The private Object IDs are placed under
enterprises(1).linksys(3955).smb(1000).switch01(201).
Feature Configuration
To enable SNMP do the following:
STEP 1 Click Configuration > System Management > Feature Configuration.
The following fields are displayed for each community:
•SNMP Management Station Community—Management station IP address
that can access the SNMP community.
•Community—Password for this community.
•Access Mode—Access rights of the community. The options are as follows:
•Read Only—Management access is restricted to read-only. Changes cannot
be made to the community.
•Read-Write—Management access is read-write. Changes can be made to
the device configuration, but not to the community.
Logs
This section describes the Logs feature, which enables the device to generate
multiple independent logs. It covers the following topics:
•Overview
•Log Management
•Remote Log Servers
•RAM Log
•Flash Memory Log
Overview
Each log is a set of messages describing system events.The device generates the
following local logs:
•Log sent to the console interface.
•Log written into a cyclical list of logged events in the RAM and erased when
the device reboots.
•Log written to a cyclical log-file saved to the Flash memory and persists
across reboots.
In addition, you can send messages to remote SYSLOG servers in the form of
SNMP traps and SYSLOG messages.
You can configure the messages that are written to each log by severity, and a
message can go to more.
Log Management
You can enable or disable logging on the Log Management page.

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You can select the events by severity level. Each log message has a severity
level marked with the first letter of the severity level separated by dashes (-) on
each side (except for Emergency that is indicated by the letter F). For example,
the log message “%INIT-I-InitCompleted: … “ has a severity level of I, meaning
Informational.
The event severity levels are listed from the highest severity to the lowest
severity, as follows:
•Emergency—System is not usable.
•Alert—Action is needed.
•Critical—System is in a critical condition.
•Error—System is in error condition.
•Warning—System warning has occurred.
•Notice—System is functioning properly, but a system notice has
occurred.
•Informational—Device information.
•Debug—Detailed information about an event.
You can select different severity levels for RAM and Flash logs. These logs are
displayed in the RAM Log page and Flash Memory Log page, respectively.
Selecting a severity level to be stored in a log causes all of the higher severity
events to be automatically stored in the log. Lower severity events are not
stored in the log.
For example, if Warning is selected, all severity levels that are Warning and
higher are stored in the log (Emergency, Alert, Critical, Error, and Warning). No
events with severity level below Warning are stored (Notice, Informational, and
Debug).
To set global log parameters, do the following:
STEP 1 Click Configuration > System Management > Logs > Log Management.
STEP 2 Enter the parameters.
System Log
•Logging—Select to enable message logging.
•Originator Identifier—Enables adding an origin identifier to SYSLOG
•messages. The options are as follows:
•None—Do not include the origin identifier in SYSLOG messages.
•Hostname—Include the system hostname in SYSLOG messages.
•IPv4 Address—Include the IPv4 address of the sending interface in
•SYSLOG messages.
•IPv6 Address—Include the IPv6 address of the sending interface in
•SYSLOG messages.
•User Defined—Enter a description to be included in SYSLOG messages.
•Log Settings
•Severity—Select the severity levels of the messages to be logged to the
following:
•RAM Memory Logging—Severity levels of the messages to be logged to
the RAM.
•Flash Memory Logging—Severity levels of the messages to be logged to
the Flash memory.
STEP 3 Click Apply. The Running Configuration file is updated.

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Remote Log Servers
The Remote Log Servers page enables defining remote SYSLOG servers where
log messages are sent (using the SYSLOG protocol). For each server, you can
configure the severity of the messages that it receives.
To define SYSLOG servers, do the following:
STEP 1 Click Configuration > System Management > Logs > Remote Log Servers.
The list of configured remote log servers is displayed.
STEP 2 Click Add.
STEP 3 Enter the parameters.
•Remote Log Server—Select whether to identify the remote log server by
IP address or name.
•IP Version—Select the supported IP version.
•IPv6 Address Type—Select the IPv6 address type (if IPv6 is used). The
options are as follows:
•Global—The IPv6 address is a global Unicast IPV6 type that is visible and
reachable from other networks.
•Link Local—The IPv6 address uniquely identifies hosts on a single
network link. A link local address has a prefix of FE80, is not routable, and
can be used for communication only on the local network. Only one link
local address is supported. If a link local address exists on the interface,
this entry replaces the address in the configuration.
•Interface—Select the link local interface (if IPv6 Address Type Link Local
is selected) from the list.
•Log Server IP Address—Enter the IP address of the log server if it is to be
identified by address.
•Log Server Name—Enter the domain name of the log server if it is to be
identified by name.
Server Settings
•UDP Port—Enter the UDP port to which the log messages are sent.
•Facility—Select a facility value from which system logs are sent to the
remote server. Only one facility value can be assigned to a server. If a
second facility code is assigned, the first facility value is overridden.
•Description—Enter a server description.
•Minimum Logging Level—Select the minimum level of system log
messages to be sent to the server.
STEP 4 Click Apply.The SYSLOG server is added, and the Running Configuration
file is updated.
RAM Log
The RAM Log page displays all messages that were saved in the RAM (cache)
in chronological order. Entries are stored in the RAM log according to the
configuration in the Log Management page.
To view log entries, click Configuration > System Management > Logs > RAM Log.
This page contains the following fields:
•Log Index—Log entry number.
•Log Time—Time when message was generated.
•Severity—Event severity.
•Description—Message text describing the event.
To clear the log messages, click Clear. The messages are cleared.
Flash Memory Log
The Flash Memory Log page displays the messages that were stored in the Flash
memory, in chronological order. The minimum severity for logging is configured
in the Log Management page. Flash logs remain when the device is rebooted.
You can clear the logs manually.
To view the Flash logs, click Configuration > System Management > Logs >
Flash Memory Log.
This page contains the following fields:
•Log Index—Log entry number.
•Log Time—Time when message was generated.
•Severity—Event severity.
•Description—Message text describing the event.
To clear the messages, click Clear. The messages are cleared.

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Chapter 5 Port Management
Linksys
15
Chapter 5 Port Management
Port Management
This section describes port configuration, link aggregation, and the Green
Ethernet feature.
It covers the following topics:
•Ports
•Link Aggregation
•Green Ethernet
•PoE
Ports
Workflow
To configure ports, perform the following actions:
1. Configure port by using the Ports page.
2. Enable/disable the Link Aggregation Control protocol, and configure the
potential member ports to the desired LAGs by using the LAG Aggregation
page. By default, all LAGs are empty.
3. Configure the Ethernet parameters, such as speed and auto-negotiation
for the LAGs by using the LAGs page.
4. Configure the LACP parameters for the ports that are members or
candidates of a dynamic LAG by using the LAGs page.
5. Configure Green Ethernet and 802.3 Energy Efficient Ethernet by using the
Green Ethernet page.
6. Configure Green Ethernet energy mode and 802.3 Energy Efficient Ethernet
per port by using the Green Ethernet page.
7. If PoE is supported and enabled for the device, configure the device as
described in PoE.
Configure Port Settings
To configure port settings:
STEP 1 Click Configuration > Port Management > Ports.
STEP 2 Select Enable to support jumbo packets of up to 10 KB in size. If Jumbo
Frames is not enabled (default), the system supports packet size up
to 2,000 bytes. For Jumbo Frames to take effect, the device must be
rebooted after the feature is enabled.
STEP 3 To update the port settings, select the desired port, and click Edit.
STEP 4 Modify the following parameters:
•Port—Select the port number.
Port Settings
•Operational Status—Displays whether the port is currently up or down.
If the port is down because of an error, the description of the error is
displayed.
•Administrative Mode—Select to bring the port up or down.
•Suspended Port—Select to reactivate a port that has been suspended. The
reactivate operation brings the port up without regard to why the port
was suspended.
•Protected Port—Select to make this a protected port. (A protected port is
also referred to as a Private VLAN Edge (PVE).) The features of a protected
port are as follows:
•Protected Ports provide Layer 2 isolation between interfaces (Ethernet
ports and LAGs) that share the same VLAN.
•Packets received from protected ports can be forwarded only to
unprotected egress ports. Protected port filtering rules are also applied to
packets that are forwarded by software, such as snooping applications.

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Chapter 5 Port Management
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•Port protection is not subject to VLAN membership. Devices connected to
protected ports are not allowed to communicate with each other, even if
they are members of the same VLAN.
•Both ports and LAGs can be defined as protected or unprotected.
•Protected LAGs are described in the LAGs section.
•Auto Negotiation—Select to enable auto-negotiation on the port. Auto-
negotiation enables a port to advertise its transmission speed, duplex
mode, and flow control abilities to the port link partner.
•Port Speed—Configure the speed of the port. The port type determines
the available speeds. You can designate this field only when port auto-
negotiation is disabled.
•Duplex Mode—Select the port duplex mode. This field is configurable only
when auto-negotiation is disabled, and the port speed is set to 10M or
100M. At port speed of 1G, the mode is always full duplex. The possible
options are:
•Half—The interface supports transmission between the device and the
client in only one direction at a time.
•Full—The interface supports transmission between the device and the
client in both directions simultaneously.
•Auto Advertisement—Select the capabilities advertised by auto-
negotiation when it is enabled. The optionsare as follows:
•Max Capability—All port speeds and duplex mode settings can be
accepted.
•10 Full Duplex—10 Mbps speed and Full Duplex mode.
•10 Half Duplex—10 Mbps speed and Half Duplex mode.
•100 Full Duplex—100 Mbps speed and Full Duplex mode.
•100 Half Duplex—100 Mbps speed and Half Duplex mode.
•1000 Full Duplex—1000 Mbps speed and Full Duplex mode.
•Back Pressure—Select the Back Pressure mode on the port (used with Half
Duplex mode) to slow down the packet reception speed when the device
is congested. It disables the remote port, preventing it from sending
packets by jamming the signal.
•Flow Control—Enable or disable 802.3x Flow Control, or enable the auto-
negotiation of flow control on the port (only when in Full Duplex mode).
•MDI/MDIX—the Media Dependent Interface (MDI)/Media Dependent
•Interface with Crossover (MDIX) status on the port. The options are as
follows:
•MDIX—Select to swap the port’s transmit and receives pairs.
•MDI—Select to connect this device to a station by using a straight-through
cable.
•Auto—Select to configure this device to automatically detect the correct
pinouts for the connection to another device.
•Description—Enter the port description.
STEP 5 Click Apply. The port settings are written to the Running
Configuration file.
Link Aggregation
•This section describes how to configure LAGs. It covers the following topics:
•Overview
•LAGs
Overview
•Link Aggregation Control Protocol (LACP) is part of the IEEE specification
(802.3ad) that enables you to bundle several physical ports together to
form a single logical channel (LAG). LAGs multiply the bandwidth, increase
port flexibility, and provide link redundancy between two devices.
•Two types of LAGs are supported:
•Static—A LAG is static if the LACP is disabled on it. The ports assigned to a
static LAG are always active members. After a LAG is manually created, the
LACP option cannot be added or removed, until the LAG is edited and a
member is removed (which can be added prior to applying), then the LACP
button becomes available for editing.
•Dynamic—A LAG is dynamic if LACP is enabled on it. The ports assigned to
dynamic LAG are candidate ports. LACP determines which candidate ports
are active member ports. The non-active candidate ports are standby ports
ready to replace any failing active member ports.