Cisco 1538M 10/100 Installation and Configuration Guide
Configuring and Monitoring from the Hub Manager
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Configuring and Monitoring from the Hub Manager

Table Of Contents

Configuring and Monitoring from the Hub Manager

Navigating in the Hub Manager

Saving Your Changes

Assigning or Changing Basic Hub Information

Assigning or Changing the Hub Name and Description

Assigning or Changing the Hub Password

Using the Hub Image to Monitor the Hub

LEDs on the Hub Image

Hub Stack Image

Using Telnet to Open a CLI Session

Connecting to Cisco Systems' Resources

Changing the Port Settings

Enabling or Disabling a Port

Checking the Link and Partition Status

Changing the Port Transmission Speed

Assigning or Changing a Port Name or Description

Checking or Resetting Port Statistics

Managing the Hub Segments

Checking or Resetting Hub Statistics

Changing the Hub IP Information

Changing the SNMP Settings

Changing the SNMP Read and Write Community Strings

Assigning or Changing Trap Managers

Enabling or Disabling Trap Generation

Assigning or Changing Write Managers

Changing the CDP Settings

Displaying CDP Neighbors

Enabling or Disabling CDP

Changing the CDP Settings

Changing the System Configuration

Configuring the Hub Console Port

Changing the CLI Inactivity Timeout Setting

Upgrading the Hub Firmware


Configuring and Monitoring from the Hub Manager


This chapter explains how to use the Cisco 1538 Hub Manager on the Cisco 1538M hubs to change the configuration settings and to monitor the hub or hub stack. This chapter assumes that you have already performed the following tasks described in this guide or in the Cisco 1538 Series Micro Hub 10/100 Cabling and Start Up:

"Connecting to the Console Port (Cisco 1538M Hubs)" section

"Assigning IP Information to a Cisco 1538M Hub" section

"Accessing the Management Interfaces for a Cisco 1538M" section


Note   Procedures for changing the configuration settings and detailed descriptions of the fields are also provided in the hub manager online help.


Navigating in the Hub Manager

At the top of each hub manager page is a menu bar. Figure 3-1 describes the functions of the pages accessible from the menu bar.


Note   On Netscape Communicator only, when the cursor is above a topic on the menu bar, a pop-up briefly describes the options on that particular page.


Figure 3-1 Hub Manager Menu Bar

Saving Your Changes

You can change the hub settings by entering information into fields, adding and removing list items, or selecting and deselecting check boxes. Click Apply to save your changes. Click Revert to discard all your unsaved changes and return the previous settings to the page.


Note   After you click Apply, you cannot revert to the previous settings.


When you enter information in fields and select or deselect check boxes, the changes are saved and immediately take effect after you click Apply.

When you add items to or remove them from lists, the changes take effect immediately. It is not necessary to click Apply.


Note   Wait approximately 30 seconds before turning off the hub to be sure the changes are saved.


Assigning or Changing Basic Hub Information

You can assign or change basic descriptions about the hub from the hub manager (Figure 3-2). You can also assign a password to the hub management interfaces
(hub manager and CLI-privileged commands) and monitor network activity through the live hub image. This page also provides a hotlink that opens a Telnet session to the hub command-line interface (CLI), in addition to hotlinks for contacting Cisco Systems resources.

Click HOME on the menu bar to display the (Figure 3-2) and check and change hub information.


Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help from the to access this information online.


Figure 3-2 Home Page

Assigning or Changing the Hub Name and Description

You can assign or change the following information about the hub (be sure to click Apply to save changes):

Name (maximum of 255 characters)

Physical location (maximum of 255 characters)

Name of the person responsible for managing the hub (maximum of 255 characters)

Assigning or Changing the Hub Password

By default, no password is assigned to the hub management interfaces. You can restrict access to the hub manager or CLI-privileged commands by assigning a password. If a user fails to enter the password within a set number of attempts, the hub sends an SNMP trap to the SNMP trap manager to alert you, via in-band management messages, of the failed attempts. (For information about trap managers, see the "Changing the SNMP Settings" section.)

When a password is assigned, the password prompt is displayed when you or any other user opens a hub manager session and displays the . The is redisplayed only after you enter the correct password. If the password prompt reappears, reenter the correct password.

To assign or change the password to the hub manager or CLI-privileged commands:


Step 1 Enter a character string (4 to 8 characters, case sensitive) in the Assign/Change Password field.

Step 2 Enter the same character string in the Reconfirm Password field.

Step 3 Click Apply.

The connection with the hub is broken. The browser prompts you for the new password.

Step 4 Enter the new password at the password authentication prompt, and click OK.

If you have forgotten or do not know the password, see the "Recovering from a Lost or Forgotten Password" section.

Using the Hub Image to Monitor the Hub

The displays the front-panel image of the hub (Figure 3-3). The following sections provide information on how to use the hub image.

Figure 3-3 Hub Image

LEDs on the Hub Image

The hub image on the shows the rear-panel LED colors at the last poll interval and refreshes every 30 seconds. The LEDs show the port status and speed (see ).

Table 3-1 Descriptions of the LEDs on the Hub Image

LED Color
Description
Port Status (RJ-45 port images)

Blue (off)

No link.

Solid green

Link operational.

Solid amber

The port is partitioned. After a packet is successfully sent over this port, the LED is green (normal operating state).

Port Speed

Blue (off)

Port is connected to a 10BaseTX network device.

Green

Port is connected to a 100BaseTX network device.


Hub Stack Image

The displays an image of the hub stack if you have interconnected hubs (Figure 3-4). The stacking connectors on the stack image is green, showing which stacking connector on each hub is interconnected to another hub. Otherwise, the stacking connector is blue (off).


Note   Every hub in the stack must be powered up for it to be displayed on the . Otherwise, if a hub in the stack is powered down, the stack image shows one less hub in the stack even if the hub is still interconnected to the stack. However, the image does not show which specific hub is no longer active. You must check the actual hub stack to find out.

If the stack image does not change after you have removed or added a hub to the stack, click the browser Reload button to refresh the stack image. Be sure you set the caching of pages to Every time in Netscape Communicator or Every visit to the page in Microsoft Internet Explorer.


A radio button appears next to each hub in the stack image. If you click the radio button next to a specific hub and click PORT from the menu bar, the for that hub is displayed. The is also displayed when you select the radio button next to a specific hub on the stack image and then click on a port on that specific hub image.

By default, the radio button next to the top hub in the stack image is selected, whether the top hub is a management hub or not.

For more information about hub stacks and managing them, see the "Managing the Hub Segments" section and "Managing the Hub Stack" section.

Figure 3-4 Hub Stack Image


Note   In Figure 3-4, the top hub on the stack image is a management hub, as indicated by the label "1538M," and is the primary management hub. The third hub in the stack is the secondary management hub. The second and fourth hubs are not management hubs.


Using Telnet to Open a CLI Session

Click Telnet to open a session on the hub command-line interface (CLI).

Connecting to Cisco Systems' Resources

The provides these hotlinks to connect to Cisco Systems' resources:

Click Cisco Connection Online (CCO) to display the CCO home page (www.cisco.com), which contains links to the support sites for downloading the latest software and displaying the latest Cisco documentation.

Click Technical Assistance Center (TAC) to open a new message composition window to send e-mail to TAC (tac@cisco.com). You can also phone TAC at 800-553-2447 or 408-526-7209.

Click HTML Interface Development Group to open a new message composition window to send e-mail to the hub manager development group (cs-html@cisco.com).

Changing the Port Settings

By default, each 10/100 network port and the 10/100 uplink port on the hub is enabled to transmit packets to and receive them from the device to which it is connected, automatically matching its speed.

Click PORT on the menu bar or click the port on the hub image on the to display the (Figure 3-5), check the status of the port, and change the port settings.

If you have a hub stack, click the radio button next to the specific hub image on the , and either click PORT from the menu bar or click the port on the specific hub image. The displays the port settings for the specific hub.


Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help from the to access this information online.


Figure 3-5 Port Management Page

Enabling or Disabling a Port

By default, all ports are enabled. To disable a port:


Step 1 In the Link Status: Requested/Actual column, deselect the Enable check box.

Step 2 Click Apply.

A linkDown trap is sent to the management station if you configured an SNMP manager.

To reenable a port:


Step 1 In the Link Status: Requested/Actual column, select the Enable check box.

Step 2 Click Apply.

A linkUp trap is sent to the management station if you configured an SNMP manager.

Checking the Link and Partition Status

The Link Status: Requested/Actual column displays the actual status of the port. Each port is always in one of these link states:

Link Up

Port can transmit and receive data.

Link Down

Port is unable to transmit or receive data.


The Partition Status column displays whether or not the port has been partitioned by the hub, which usually happens as a result of excessive collisions or a network loop. Each port is always in one of these partition states:

Partitioned

Port is isolated from the network communications.

Not Partitioned

Port is not isolated from the network communications.


Changing the Port Transmission Speed

By default, the ports automatically match the transmission speed of the attached device. To change the port speed:


Step 1 From the Speed: Requested/Actual drop-down list, select 10 Mbps, 100 Mbps, or Auto (autonegotiate). The default is Auto.

Step 2 Click Apply.


Note   If the other device does not autonegotiate, the hub port automatically negotiates to 10 Mbps.


Assigning or Changing a Port Name or Description

To assign a name or description to a port:


Step 1 In the Port Name/Description column, enter the port name or a description
(up to 20 characters) of how the port is connected.

Step 2 Click Apply.

Checking or Resetting Port Statistics

From the , select a port, and click View to see the statistics for a particular port on the hub. The (Figure 3-6) for the selected port displays the port statistics. lists the statistics displayed on the page.

Click Reset Port Statistics to reset the statistics.

The hub manager does not automatically refresh the statistics shown on this page. Click Reload to refresh the statistics shown on this page.

Figure 3-6 Detailed Port Statistics Page

Table 3-2 Error Descriptions on the

Packets

Total number of packets received by the port.

Bytes

Total number of bytes received by the port.

FCS Errors

Number of frame check sequence (FCS) errors indicating that frames of data are being corrupted during transmission.

Alignment Errors

Number of alignment errors (caused if all bytes are not received whole) received by the port.

Packets Too Long

Number of packets received by the port that exceed the maximum size for IEEE 802.3 frames.

Short Events

Number of packets received by the port that are smaller than runts, which are smaller than the minimum size for IEEE 802.3 packets.

Packets Too Short

Number of frames received by the hub that are smaller than the minimum size for IEEE 802.3 frames.

Collisions

Number of times the hub and the connected device attempt to transmit at the same time.

Late Events

Number of frames that experienced a collision late in transmission.

Very Long Events

Number of packets that exceed the maximum length prescribed in IEEE 802.3.

Data Rate Mismatches

Number of frames whose timing no longer matches the transmit frequency between the hub and the connected device.

Autopartitions

Number of times the port automatically partitions the segments attached to it.

Total Errors

Total number of errors received by the port.


Managing the Hub Segments

You can interconnect up to four Cisco 1538 hubs (a maximum of 32 ports) and manage that hub stack as a single logical repeater. To provide management to the stack, the stack must include at least one Cisco 1538M hub. You can have a second management hub in the stack to act as a redundant stack manager in case the primary manager fails. For complete information and guidelines on stacking hubs, see "."

Click GROUP on the menu bar to display the (Figure 3-7). From this page, you can display the statistics of each hub in the stack.


Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help from the to access this information online.


Figure 3-7 Group Management Page


Note   Figure 3-7 shows the when there are at least two hubs in the stack.


This page displays the number of active hubs (groups) in the hub stack. Group 1 always represents the hub at the top of the stack, and the hub below Group 1 is Group 2, and so on. If you remove a hub from the stack, this page automatically renumbers the hubs accordingly.


Note   Every hub in the stack must be powered up for it to be displayed on the and on the . Otherwise, if a hub in the stack is powered down, the hub manager shows one less hub in the stack even if the hub is still interconnected to the stack. However, the image does not show which specific hub is no longer active. You must check the actual hub stack to find out.

If the stack image does not change after you have removed or added a hub to the stack, click the browser Reload button to refresh the stack image. Be sure you set the caching of pages to Every time in Netscape Communicator or Every visit to the page in Microsoft Internet Explorer.


If a hub stack has more than one management hub, the upper management hub in the stack is the primary management hub. The lower management hub is the secondary management hub.

To manage the hub stack, you can use the system information (such as the IP, CDP, and SNMP information) assigned to the primary management hub. The primary management hub also stores the port settings of each hub in the stack. If the primary management hub becomes inactive or is disconnected from the stack, the secondary management hub becomes the primary management hub and uses the same stack information.

If a stack has only one management hub and another management hub is added to the stack, the system information from the management hub that has the longest system-up time is used by the topmost management hub. This happens if the new management hub is added either above or below the preexisting management hub.

If you replace the only management hub in the stack with a different management hub, the stack will use the settings of the newly installed management hub.


Note   If you have a stack that has two management hubs and you remove one management hub from the stack, it will have the same IP address as the stack. Avoid IP conflict by changing the IP address of the removed management hub before you reuse it and connect it to another hub stack in the network.


Checking or Resetting Hub Statistics

From the , select the hub, and click View to see the statistics of a single hub or a hub in the hub stack. The (Figure 3-8) for the hub (group) you selected displays the hub statistics. lists the statistics displayed on the page.

Click Reset Group Statistics to reset the statistics.

The hub manager does not automatically refresh the statistics shown on this page. Click Reload to refresh the statistics shown on this page.

Figure 3-8 Detailed Group Statistics Page

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Table 3-3 Error Descriptions on the

Packets

Total number of packets received by the port.

Bytes

Total number of bytes received by the port.

FCS Errors

Number of frame check sequence (FCS) errors indicating that frames of data are being corrupted during transmission.

Alignment Errors

Number of alignment errors (caused if all bytes are not received whole) received by the port.

Packets Too Long

Number of packets received by the port that exceed the maximum size for IEEE 802.3 frames.

Short Events

Number of packets received by the port that are smaller than runts, which are smaller than the minimum size for IEEE 802.3 packets.

Packets Too Short

Number of frames received by the hub that are smaller than the minimum size for IEEE 802.3 frames.

Collisions

Number of times the hub and the connected device attempt to transmit at the same time.

Late Events

Number of frames that experienced a collision late in transmission.

Very Long Events

Number of packets that exceed the maximum length prescribed in IEEE 802.3.

Data Rate Mismatches

Number of frames whose timing no longer matches the transmit frequency between the hub and the connected device.

Autopartitions

Number of times the port automatically partitions the segments attached to it.

Total Errors

Total number of errors received by the port.


Changing the Hub IP Information

IP information identifies the hub (or managed hub stack) to the network and is necessary to manage the hub (or hub stack) through the hub manager, the CLI, or SNMP. This information is usually assigned to the hub after it is installed and initially started up. (See the "Assigning IP Information to a Cisco 1538M Hub" section.)

The IP Address field displays the current IP address of the hub. Click IP on the menu bar to display the (Figure 3-9) and change hub IP information.


Note   If you have a stack that has two management hubs and you remove one management hub from the stack, it will have the same IP address as the stack. Avoid IP conflict by changing the IP address of the removed management hub before you reuse it and connect it to another hub stack in the network. For complete information and guidelines on managing hub stacks, see the "Managing the Hub Segments" section and the "Managing the Hub Stack" section.



Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help on the to access this information online.


Figure 3-9 IP Management Page


Caution    Changing the hub IP address on this page will end your hub manager session. To open a new session, enter the new IP address in the URL field if you are using Communicator (the Address field if you are using Internet Explorer).

To manually change the hub IP information:


Step 1 Select User-Configured from the IP State drop-down list.


Note   You can manually change the hub IP information only if the User-Configured option is enabled.



Note   Use the BootP Get IP option if you want the BootP (Boot Protocol) server to assign the IP information. The hub must be connected to a network that has a BootP server. The BootP Get IP option becomes active when you restart the hub. If this option is enabled, you cannot manually change IP information.


The default is User-Configured.

Step 2 Enter a new IP address for the hub in the IP Address field.


Caution    If you enter a new address and click Apply, the hub manager loses contact with the hub. Enter the new IP address of the hub in the Location field if you are using Communicator (the Address field if you are using Internet Explorer) to redisplay the hub manager.

Step 3 Enter the subnet mask for the hub.

The subnet mask must be in the same subnet as the IP address.

Step 4 Enter the IP address of the default gateway.

The default gateway is the router that the hub uses to reach IP subnets other than the local subnet to which the hub is attached.

Step 5 Click Apply.

Changing the SNMP Settings

SNMP provides the means to manage and monitor the hub (or managed hub stack) through the Management Information Base (MIB) objects. Additional information about SNMP and MIB objects is provided in the "Overview of SNMP" section and the "Accessing the MIB Files through SNMP" section.

Click SNMP on the menu bar to display the (Figure 3-10) and check and change the SNMP settings.


Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help on the to access this information online.


Figure 3-10 SNMP Management Page

Changing the SNMP Read and Write Community Strings

Community strings serve as passwords for SNMP messages. You can assign community strings that enable the hub to validate SNMP read and read-write requests from a management station.

To change the SNMP Read community string:


Step 1 Enter up to 32 characters in the Read Community String field. The default is public.

Step 2 Click Apply.

To change the SNMP Write community string:


Step 1 Enter up to 32 characters in the Write Community String field. The default is private.

Step 2 Click Apply.

Assigning or Changing Trap Managers

A trap manager is an SNMP management station that receives traps, which are the system alerts generated by the hub. If no trap manager is defined, no traps are issued. Up to four trap managers and their accompanying community strings can be entered.

To assign a trap manager:


Step 1 Enter the IP address and a community string (up to 32 characters) in the IP Address and Trap Manager Community String fields.

Step 2 Click Add.

To remove a trap manager:


Step 1 Select the manager from the Current list.

Step 2 Click Remove.

Enabling or Disabling Trap Generation

By default, the Enable Authentication Trap Generation check box is selected (meaning this parameter is enabled). When this check box is selected, the hub generates authentication traps that alert a management station to SNMP requests that are not accompanied by a valid community string. However, even if this parameter is enabled, no trap can be generated if no trap manager addresses are specified. (For information about trap manager settings, see the "Assigning or Changing Trap Managers" section). If you change this check box, click Apply to save your changes.

By default, the Enable Link Up/Link Down Trap Generation check box is selected (meaning this parameter is enabled). If you change this check box, click Apply to save your changes.

The hub generates linkDown traps when a port is suspended or disabled for these reasons:

User disables the port.

Link is down.

The hub generates linkUp traps when a port is enabled for these reasons:

Presence of linkbeat.

Management intervention enables the port.

Assigning or Changing Write Managers

A write manager is an SNMP management station that can issue write requests to the hub. Up to four IP addresses of stations can be defined.

To assign a write manager:


Step 1 Enter the management station IP address in the IP Address field.

Step 2 Click Add.

To remove a write manager:


Step 1 Select the manager from the Current list.

Step 2 Click Remove.

Changing the CDP Settings

The Cisco Discovery Protocol (CDP) enables the hub (or managed hub stack) to advertise its existence to other Cisco devices in the network. When CDP is enabled, the hub manager and network management applications have an accurate picture of the network at any time because CDP gathers information about device types, links between devices, and the number of interfaces within each device.

By default, the hub is CDP-enabled. Click CDP on the menu bar to display the (Figure 3-11) and check and change the CDP settings.


Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help on the to access this information online.


Figure 3-11 CDP Management Page

Displaying CDP Neighbors

The Discovered Neighboring Devices list shows the devices with which the hub exchanges CDP messages. To display information about neighboring devices:


Step 1 From the Discovered Neighboring Devices list, select a device.

Step 2 Click one of these buttons:

Click Browse to access the web console of a neighboring device. The neighbor must be a device that has web-console support.

Click Telnet to open a Telnet session and log into a neighboring device.

Click Details to display the detailed CDP information currently stored in the hub.

Enabling or Disabling CDP

By default, CDP is enabled on the hub. If you do not want the hub to exchange information with Cisco devices, you can disable CDP on the hub. To disable CDP:


Step 1 Deselect the Enable CDP check box.

Step 2 Click Apply.

To reenable CDP:


Step 1 Select the Enable CDP check box.

Step 2 Click Apply.

Changing the CDP Settings

To change the global CDP settings for the hub:


Step 1 In the Packet Hold Time field, enter the number of seconds (between 10 and 255) that a neighboring device retains the CDP neighbor information received from this hub. The default setting is 180 seconds.

If a neighboring device does not receive a CDP message before the hold time expires, the device drops this hub as a neighbor. The packet hold time should be higher than the packet transmission time.

Step 2 In the Packet Transmission Time field, enter the number of seconds
(between 5 and 900) between transmissions of CDP messages. The default is 60 seconds. The packet transmission time should be lower than the packet hold time.

Step 3 Click Apply.

Changing the System Configuration

Cisco periodically provides new firmware to implement enhancements and maintenance releases. New firmware releases can be downloaded from Cisco Connection Online (CCO), the Cisco Systems' customer web site available at the following URLs: www.cisco.com, www-china.cisco.com, and www-europe.cisco.com.

The Firmware Version field displays the firmware version in use. You can download the latest hub firmware from a TFTP server.


Note   When you download the firmware permanently to Flash memory, the hub does not respond to commands for approximately 1 minute. This is normal and correct. Do not turn off the hub. The hub then resets and begins using the new firmware.



Caution    If you interrupt the transfer by turning the hub off and on, the firmware could get corrupted. For recovery procedures, see the "Recovering from Corrupted Firmware" section.

If you want to upgrade the firmware of the management hub, click SYSTEM on the menu bar to display the (Figure 3-12).


Note   This section provides detailed information about this page and procedures on changing the settings. When you are using the hub manager, click Help on the to access this information online.


Figure 3-12 System Configuration Page

Configuring the Hub Console Port

The console port on the hub allows terminal and PC access to the hub. After the hub is installed, be sure to configure the console port settings of the hub to match the settings of the terminal or PC.

These are the default settings of the hub console port:

Baud rate default is 9600.

Data bits default is 8.


Note   If data bits is 8, set parity to None.


Stop bits default is 1.

Parity settings default is None.

If you change any of these settings, click Apply to save your changes.

Changing the CLI Inactivity Timeout Setting

You can change the number of seconds that the CLI can wait without activity before it times out. After timeout, you must reenter the password.

To change the inactivity timeout parameter:


Step 1 Enter the number of seconds (0, or 30 to 65500) in the CLI Inactivity Timeout field. The default is 0 (which means the console session does not time out).

Step 2 Click Apply.

Upgrading the Hub Firmware

The Firmware Version field displays the firmware version used by the hub. You can upgrade the firmware by following these steps to download the latest firmware from a TFTP server to your hub:


Step 1 In the Server IP Address field, enter the IP address of the TFTP server on which the upgrade file is located.

Step 2 Enter the upgrade filename (up to 80 characters) in the Filename for Firmware Upgrades field.

Step 3 Select one of these download modes:

Permanent to download the firmware to Flash memory.

Temporary to download the firmware to DRAM. Use this option to test the new firmware before overriding the previous firmware. After a power cycle, the hub discards the new firmware and uses the previous firmware.

The default is Permanent.

Step 4 Click System TFTP Upgrade to download the upgrade file from the TFTP server to the hub.

Step 5 Click OK on the confirmation prompt.


Note   When you download the firmware permanently to Flash memory, the hub does not respond to commands for approximately 1 minute. This is normal and correct. Do not turn off the hub. The hub then resets and begins using the new firmware.



Caution    If you interrupt the transfer by turning the hub off and on, the firmware could get corrupted. For recovery procedures, see the "Recovering from Corrupted Firmware" section.