Page 1
CHAPTER
Overview 1-1
1
Overview
This chapter describes the features and components of the Cisco 1538 series Micro Hubs
10/100 (hereafter collectively referred to as the “Micro Hubs”). These class-II repeaters are
a part of the Cisco Networked Office stack, a family of stackable, desktop networking
platforms designed for small workgroups.
Overview of the Micro Hubs
The Micro Hubs are stackable, 8-port, 10/100-Mbps, autosensing Fast Ethernet class II
repeaters with internal bridging.
• The Cisco 1538M Micro Hub 10/100 (hereafter referred to as the “managed hub”) can
be monitored through a web console or the command-line interface. This hub can
manage a stack of up to 3 additional Micro Hubs and serve up to 32 user connections.
For an overview of the management features of this hub, see the “Management Options
(Cisco 1538M Hub)” section on page 1-7.
• The Cisco 1538 Micro Hub 10/100 (hereafter referred to as the “manageable hub”) is
without internal management applications but can be monitored and controlled through
interconnection to a managed hub.
Either hub model can be a standalone networking device or can connect to other routers,
switches, and hubs to form a larger network. You can also stack and connect up to four hubs
through the rear-panel ports to form a larger network.
Page 2
Features
Cisco 1538 Series Micro Hub 10/100 Installation and Configuration Guide
1-2
Features
Table 1-1 summarizes the features of the Micro Hubs.
Table 1-1 Feature Summary of the Micro Switch
Feature Description
Management
• Simple Network Management Protocol (SNMP) and Remote Monitoring (RMON)
provides configuration, management and monitoring on a per-port and per-hub basis.
• Three management interface options:
— The Cisco ConfigMaker configuration application provides a single configuration
interface for all products in the Cisco Networked Office stack.
— Cisco 1538 Hub Manager with an embedded HTTP server provides an interface for
all supported management functions.
— A command-line interface (CLI) supports management through Telnet in-band or
console port out-of-band connections.
• Menu-based diagnostic console for hub recovery tasks.
• Cisco Discovery Protocol (CDP) enables network management stations to discover the
hub in a network topology.
• Manages up to 32 ports in a 4-hub stack with one IP address.
Stacking
• Integrated stacking ports allow up to four hubs in a single collision domain.
• Two managed hubs can be deployed for management backup.
Performance
• Autosensing on all ports allows automatic configuration for either 10BaseT or
100BaseT connections.
• Built-in high-speed bridge function automatically connects 10BaseT and 100BaseT
workstations without an external switch or router.
• Embedded switch supports store-and-forward switching and filtering and forwarding
rate at full-wire speed.
MDI/MDI-X connectivity
• MDI/MDI-X option for port 5 inter-hub connectivity without crossover cables.
• Class II repeater supports a two-hub daisy chain.
Connectivity
• Complies to the IEEE 802.3 10BaseT and 802.3u 100BaseTX specifications.
Security slot
• The switch can be secured to a desktop or other surface using lockdown equipment.
Page 3
Overview 1-3
Front-Panel LEDs
Front-Panel LEDs
This section describes the hub front-panel LEDs.
Figure 1-1 Front-Panel LEDs
1234
5678
PWR
COL
Blinking amber
—Hub detects
collisions on the network. The LED
blinks faster as more collisions occur.
ACT
Blinking green
—Traffic is present.
14347
10 MBPS
COL/ACT
100 MBPS
COL/ACT
PWR
Solid green—Micro Hub has power.
Solid amber—POST in progress.
After power-on—POST nonfatal failure.
With blinking port LED—POST fatal failure.
Off—Micro Hub does not have power.
Hub port status
Solid green—Good connection to network device (link).
Blinking green—Data is being sent or received through this port.
Blinking rate reflects the amount of data being received.
Solid amber—The hub has partitioned this port.
Off—No connection to network device (no link).
Page 4
Rear-Panel Components
Cisco 1538 Series Micro Hub 10/100 Installation and Configuration Guide
1-4
Rear-Panel Components
Figure 1-2 shows the rear-panel ports, connectors, and LEDs for the Cisco 1538M and
Cisco 1538 Micro Hubs.
Figure 1-2 Rear-Panel LEDs and Components of the Cisco 1538M Managed Hub
14335
DOWN
UP
5x
MDI -XMDI
LED
ON
OFF
SPEED
100BaseTX
10BaseTX
RATING
100-127 /200-240 V~
0.3A / 0.2 50/60 Hz
1
6x 7x 8x
1x
Cisco 1538M
2x 3x10/100 4x
CONSOLE
234
5 678
Hub ports, 1X through 8X (RJ-45)
Use 10BaseT or 100BaseTX Ethernet
straight-through cables to connect
network devices.
MDI/MDI-X button for port 5
OUT (default)—Connect 10BaseT or
100BaseTX PC, workstation, router, or
server with straight-through Ethernet
cable.
IN—Connect another Cisco hub.
Hub port status
Solid green—Link is established at 100 Mbps.
Off—Link is established at 10 Mbps or no link.
Power receptacle
Connect power cord
to this receptacle.
Lock
slot
Console port
Stacking ports
The UP connector connects to
upstream hub DOWN connector.
The DOWN connector connects
to downstream UP connector.
Page 5
Overview 1-5
Rear-Panel Components
Figure 1-3 Rear-panel Components of the Cisco 1538 Manageable Hub
16220
DOWN
UP
5x
MDI -XMDI
LED
ON
OFF
SPEED
100BaseTX
10BaseTX
RATING
100-127 /200-240 V~
0.3A / 0.2 50/60 Hz
1
6x 7x 8x
1x
Cisco 1538
2x 3x10/100 4x
234
5 678
Hub ports, 1X through 8X (RJ-45)
Use 10BaseT or 100BaseTX Ethernet
straight-through cables to connect
network devices.
MDI/MDI-X button for port 5
OUT (default)—Connect 10BaseT or
100BaseTX PC, workstation, router, or
server with straight-through Ethernet
cable.
IN—Connect another Cisco hub.
Hub port status
Solid green—Link is established at 100 Mbps.
Off—Link is established at 10 Mbps or no link.
Power receptacle
Connect power cord
to this receptacle.
Lock
slot
Stacking ports
The UP connector connects to
upstream hub DOWN connector.
The DOWN connector connects
to downstream UP connector.
Page 6
Stack Management
Cisco 1538 Series Micro Hub 10/100 Installation and Configuration Guide
1-6
Stack Management
Micro Hubs can be interconnected by using the stacking cable and the stacking connectors
on the rear panel of the hubs, creating a stack of up to four Micro Hubs (Figure 1-4). The
interconnected units in that stack appear to the rest of the network and to the management
interface as a single logical repeater. You can have a second managed hub in the stack act
as a redundant stack manager in case the primary manager fails.
Note You need at least one managed hub in your stack if you want to manage the stack.
Figure 1-4 Stacking Micro Hubs to Create Larger Managed Networks
For more information about stacking Micro Hubs, see “Installing Micro Hubs in a Stack”
on page 2-8.
MDI MDI-X
DOWN
UP
5x
MDI -XMDI
LED
ON
OFF
SPEED
100BaseTX
10BaseTX
RATING
100-127 /200-240 V~
0.3A / 0.2 50/60 Hz
1
6x 7x 8x
1x
Cisco 1538
2x 3x10/100 4x
234
5 678
DOWN
UP
5x
MDI -XMDI
LED
ON
OFF
SPEED
100BaseTX
10BaseTX
RATING
100-127 /200-240 V~
0.3A / 0.2 50/60 Hz
1
6x 7x 8x
1x
Cisco 1538M
2x 3x10/100 4x
CONSOLE
234
5 678
Cisco 1538M Hub
Cisco 1538M Hub
Cisco 1538 Hub
Cisco 1538 Hub
14346
DOWN
UP
5x
MDI -XMDI
LED
ON
OFF
SPEED
100BaseTX
10BaseTX
RATING
100-127 /200-240 V~
0.3A / 0.2 50/60 Hz
1
6x 7x 8x
1x
Cisco 1538
2x 3x10/100 4x
234
5 678
DOWN
UP
5x
MDI -XMDI
LED
ON
OFF
SPEED
100BaseTX
10BaseTX
RATING
100-127 /200-240 V~
0.3A / 0.2 50/60 Hz
1
6x 7x 8x
1x
Cisco 1538M
2x 3x10/100 4x
CONSOLE
234
5 678
Page 7
Overview 1-7
Management Options (Cisco 1538M Hub)
Management Options (Cisco 1538M Hub)
The Cisco 1538M hub can manage a single hub or a hub stack. You can use the default
settings shipped with the hub, or you can customize the configuration through the Cisco
1538 Hub Manager web-based interface, the CLI, or SNMP.
The Cisco 1538 Hub Manager is the easiest interface to use for the basic configuration and
monitoring tasks. To perform all the configuration and monitoring tasks, use the CLI and
SNMP.
This section provides the following information:
• List of default configuration settings for the hub
• Overview of the Cisco 1538 Hub Manager and the basic management tasks you can
perform using it
Note Procedures for performing management tasks and detailed information about the
Cisco 1538 Hub Manager pages are also provided in the Cisco 1538 Hub Manager
online help.
• Overview of the CLI, which is fully described in the Cisco 1538 Series Micro Hub
10/100 Command Reference.
• Overview of SNMP and the hub Management Information Base (MIB) files.
Note The menu-based diagnostic console is described in the “Recovery Procedures Using
the Diagnostic Console” section on page 4-7.
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Management Options (Cisco 1538M Hub)
Cisco 1538 Series Micro Hub 10/100 Installation and Configuration Guide
1-8
Default Configuration Settings
The hub is designed to operate with little or no user intervention. After you assign the IP
information, the hub uses its default settings (Table 1-2) and begins forwarding packets as
soon as it is powered up and connected to compatible devices.
.
For procedures on how to reset all hub console port settings to the factory defaults, see the
“Resetting the Hub to the Factory Defaults” section on page 4-14.
Table 1-2 Default Settings and Cisco 1538 Hub Manager Pages
Feature Default Setting Hub Manager Page
Management
IP information 0.0.0.0 IP Management Page
Stack management — Group Management Page
Cisco Discovery Protocol (CDP) Enabled CDP Management Page
Performance Tuning
Speed of ports Autonegotiate Port Management Page
Security
Hub password None Home Page
Community string public/private SNMP Management Page
Trap manager None SNMP Management Page
Write manager None SNMP Management Page
Diagnostics
Usage reports — Detailed Group Statistics Page
Detailed Port Statistics Page
Remote monitoring Enabled —
Upgrades
Firmware — System Configuration Page
Page 9
Overview 1-9
Overview of the Cisco 1538 Hub Manager
Overview of the Cisco 1538 Hub Manager
The Cisco 1538 Hub Manager (hereafter referred to as the hub manager) is a web-based
graphical user interface for basic hub configuration and monitoring. Using the hub
manager, you can configure and monitor the hub from anywhere on your intranet.
Each hub manager page
• Provides fields, check boxes, and lists for changing the configuration settings
• Displays current information about the hub
• Provides online help for each page
— Detailed information about the fields, lists, check boxes, and buttons
— Specific procedures for performing management tasks
To use the hub manager, you must have one of these web browsers installed on your
management station:
• Netscape Communicator 4.03 or higher
• Microsoft Internet Explorer 4.01 or higher
Management Tasks Supported on the Hub Manager
The management tasks you can perform from the hub manager can be grouped as described
in Table 1-3.
Procedures for accessing and using the hub manager are provided in
• “Accessing the Cisco 1538 Hub Manager” section on page 2-27
• Chapter 3, “Configuring and Monitoring from the Hub Manager”
Note Information provided in Chapter 3, “Configuring and Monitoring from the Hub
Manager,” is also provided in the hub manager online help.
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Management Options (Cisco 1538M Hub)
Cisco 1538 Series Micro Hub 10/100 Installation and Configuration Guide
1-10
Overview of the Command-Line Interface
Using the CLI, you can access the hub software and perform the same basic system
configuration and system monitoring tasks available through the hub manager. You can also
perform privileged configuration and troubleshooting tasks available only through the CLI
and SNMP.
Procedures describing how to access the CLI are in the “Accessing the CLI” section on
page 2-29. For complete information about using the CLI, refer to the Cisco 1538 Series
Micro Hub 10/100 Command Reference.
Table 1-3 Configuration and Monitoring Tasks
Changing Hub and Port Configuration Settings
Assigning or Changing Basic Hub Information on page 3-4
Changing the Port Settings on page 3-11
Managing the Hub Segments on page 3-17
Changing the Hub IP Information on page 3-21
Changing the CDP Settings on page 3-26
Changing the System Configuration on page 3-29
Changing Hub Security
Assigning or Changing the Hub Password on page 3-5
Changing the SNMP Settings on page 3-23
Monitoring Hub and Port Conditions
Using the Hub Image to Monitor the Hub on page 3-6
Checking or Resetting Port Statistics on page 3-15
Checking or Resetting Hub Statistics on page 3-19
Remote Monitoring on page 2-31
Page 11
Overview 1-11
Overview of SNMP
Overview of SNMP
You can configure and monitor the hub by accessing the Management Information Base
(MIB) variables through Simple Network Management Protocol (SNMP), an
application-layer protocol facilitating the exchange of management information between
network devices. The hub supports a comprehensive set of MIB objects, including four
Remote Monitoring (RMON) groups. (The “Accessing the MIB Files through SNMP”
section on page 2-29 provides information about the MIB files and about accessing them.)
The SNMP system consists of three parts: SNMP manager, SNMP agent, and the MIB files.
SNMP places all operations in a get-request, get-next-request, and set-request format. For
example, an SNMP manager can get a value from an SNMP agent or store a value into that
SNMP agent. The SNMP manager can be part of a network management system (NMS),
and the SNMP agent can reside on a networking device such as a hub. You can compile the
hub MIB files with your network management software. The SNMP agent can respond to
MIB-related queries being sent by the NMS.
An example of an NMS is the CiscoWorks network management software. CiscoWorks
uses the hub MIB variables to set device variables and to poll devices on the network for
specific information. The results of a poll can be displayed as a graph and analyzed in order
to troubleshoot internetworking problems, increase network performance, verify the
configuration of devices, monitor traffic loads, and more.
Figure 1-5 shows how the SNMP agent gathers data from the MIB file, which holds
information about device parameters and network data. The agent can send traps, or
notification of certain events, to the manager.
Figure 1-5 SNMP Network
Get-request, Get-next-request,
Get-bulk, Set-request
Network device
Get-response, traps
S1203a
SNMP manager
NMS
MIB
SNMP agent
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Management Options (Cisco 1538M Hub)
Cisco 1538 Series Micro Hub 10/100 Installation and Configuration Guide
1-12
Note Make sure you use the correct Read and Write community strings so that your
SNMP request does not fail. Refer to the online help SNMP Management Page for the
correct community strings.
The SNMP manager uses information in the MIB files to perform the operations described
in Table 1-4.
Table 1-4 SNMP Manager Operations
Operation Description
get-request Retrieves a value from a specific variable.
get-next-request Retrieves a value from a variable within a table.
1
1 An SNMP manager does not need the exact variable name. It sequentially searches to find the needed variable
from within a table.
get-response Reply to a get-request, get-next-request, and set-request sent by an NMS.
set-request Store a value in a specific variable.
trap Send an unsolicited message from an SNMP agent to an SNMP manager
indicating that some event has occurred.
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