Page 2 - Introduction; Features; Management Features
Back to Contents Page Introduction Dell™ PowerConnect™ 3248 Systems User's Guide Features Front-Panel Components Back-Panel Descriptions Management Features The Dell™ PowerConnect™ 3248 Fast Ethernet Managed Switch offers the following features: l 48 10/100BASE-TX auto-sensing Fast Ether...
Page 3 - Front-Panel Components; PWR LED; Port LEDs; Fast Ethernet Ports
Front-Panel Components The front panel of the switch contains the console port, all of the Ethernet ports, LEDs, and the Mode select button. As shown in the following figure, the switch has three system LEDs and one LED for each port. The following sections describe the front panel in more detail. P...
Page 4 - Back-Panel Descriptions; AC Power Receptacle; Management; Web-Based Interface; SNMP-Based Management
l Blinking orange — A 10/100-Mbps link is up and there is activity. l Flashing orange — The link is in the admin down state. l Off — The link is down. Duplex (FDX) Mode l Green — A full-duplex link is up. l Off — A half-duplex link is up. Back-Panel Descriptions The back panel of the switch contains...
Page 6 - Installation; Package Contents; Installing the Switch Without the Rack; Installing the Switch in a Rack; External Redundant Power System
Back to Contents Page Installation Dell™ PowerConnect™ 3248 Systems User's Guide Package Contents Before you begin installing the switch, confirm that your package contains the following items: l Switch l AC power cable l Null modem cable l Self-adhesive rubber pads for desktop installation l Rack m...
Page 7 - Password Protection
The switch provides an RS-232 serial port that enables a connection to a computer or terminal for monitoring and configuring the switch. This port is a male DB-9 connector, implemented as a data terminal equipment (DTE) connection. To use the console port, you need the following equipment: l A termi...
Page 8 - SNMP Settings; IP Address Assignment
SNMP Settings Simple Network Management Protocol (SNMP) is a protocol designed specifically for managing devices on a network. Network equipment, such as hubs, switches, and routers, use SNMP to configure system features for proper operation, as well as to monitor their performance and detect potent...
Page 9 - Connecting Devices to the Switch
Before you can assign a static IP address to the switch, you must obtain the following information from your network administrator: l IP address for the switch l Default gateway for the network l Network mask for the network To assign a static IP address to the switch: 1. From the Privileged Exec ...
Page 10 - Web Pages
Back to Contents Page Management Interface Dell™ PowerConnect™ 3248 Systems User's Guide With web-based management, you can configure the PowerConnect 3248 Fast Ethernet Managed Switch and monitor the system using a web browser. Most pages for the switch include the following buttons: l Refresh — Di...
Page 11 - Switch; General Information; Asset
Switch The Switch page contains all system operations and general information. It includes links to the following options: l General — Allows you to view general system information and perform general administration. l IP Address — Allows you to view or edit Internet Protocol (IP) parameters. l Secu...
Page 13 - Health; Versions
----------------- DONE ------------------ Health The Health page contains the following information: l Internal Power Status l Redundant Power Status The power status is indicated by the following icons: l Green check — Power is connected and operating. l Red cross — Power is connected but has faile...
Page 14 - Logs
l Microcode Version l Loader Version l Boot-ROM Version l Operation Code Version l Total Port Number l Role l Service Tag l Serial Number CLI Commands The following table summarizes the equivalent CLI command for items in the Switch/General/Versions page. Example Console#show version Unit1 Serial ...
Page 15 - IP Address
CLI Commands The following table summarizes the equivalent CLI commands for items in the Switch/General/Logs page. The system log messages are categorized by severity into eight levels, from 0 (Emergencies) to 7 (Debugging). The CLI command logging history allows you to specify which levels are logg...
Page 16 - DHCP; Security
CLI Commands The following table summarizes the equivalent CLI commands for items in the Switch/IP Address page. Example Console(config)#interface vlan 1 Console(config-if)#ip address 192.168.1.5 255.255.255.0 Console(config-if)#exit Console(config)#ip default-gateway 192.168.1.254 Console(config)# ...
Page 17 - Passwords; RADIUS Settings
l Passwords l RADIUS Settings Passwords You should change the default passwords to be sure that your system is secure: l Old Password — Type your current password. l New Password — Type the new password. Passwords are limited to eight characters and are case sensitive. l Confirm Password — Type the ...
Page 18 - Firmware Upgrade
l Server IP Address — Identifies the IP address of the RADIUS server. l Server Port Number — Identifies the User Datagram Protocol (UDP) port number used by the RADIUS server. l Secret Text String — Specifies the text string that is shared between the switch and the RADIUS server. l Number of Server...
Page 19 - Deleting an Operation Code File from the Switch
l Remove Operation Code Image File — Deletes a software file from the switch. l Start-Up Operation Code File Name — Indicates which Operation Code file you want to run. Select the filename from the drop-down menu. Uploading Operation Code to a Server 1. In the Transfer Operation Code Image File to...
Page 20 - Configuration; Transferring a Configuration File to a Server
Destination file name: 0126.bix / Console# Configuration From the Configuration page you can save and restore switch configuration settings. The Configuration page contains the following editable fields: l Transfer Configuration to Server — Copies a switch configuration file to a TFTP server. l Tran...
Page 21 - Reset
Copying the Running Configuration to a File 1. In the Copy Running Config to File field, specify a filename for the configuration file (with no more than 32 characters). If the filename already exists, it replaces the file. The filename cannot be the same as the factory default configuration file,...
Page 22 - Ports; Port Configuration
Console#reload System will be restarted, continue <y/n>? y Console# Ports The Port Manager contains links to the following options: l Port Configuration l Trunk Configuration l Broadcast Control l Port Mirroring Port Configuration On the Port Configuration page, you can view and edit port para...
Page 23 - Trunk Configuration
Example Console(config)#interface ethernet 1/5 Console(config-if)# Console(config-if)#description RD SW#3 Console(config-if)#no negotiation Console(config-if)#speed-duplex 100half Console(config-if)#flowcontrol Trunk Configuration On the Trunk Configuration page, you can enable and disable the aggre...
Page 24 - Broadcast Control
CLI Commands The following table summarizes the equivalent CLI commands for items in the Ports/Trunks Configuration page. Example Console(config)#interface port-channel 1 Console(config-if)# Console(config-if)#description RD SW#3 Console(config-if)#no negotiation Console(config-if)#speed-duplex 100h...
Page 25 - Port Mirroring; Address Table
Example Console(config)#interface ethernet 1/5 Console(config-if)#switchport broadcast packet-rate 600 Console(config-if)# Port Mirroring From the Port Mirroring page, you can configure up to nine port mirror sessions by setting source and destination port pairs. Port mirroring helps you debug a net...
Page 26 - Static Addresses; Dynamic Addresses
l Dynamic Addresses l Address Aging Static Addresses From the Static Addresses page, you can specify the Media Access Control (MAC) address and port number of systems that are to remain available to the switch for an indeterminate amount of time. The following options are available: l Static Address...
Page 27 - Address Aging
CLI Commands The following table summarizes the equivalent CLI command for items in the Address Table/Dynamic Addresses page. Example Console#show bridge 1 Interface Mac Address Vlan Type --------- ----------------- ---- ----------------- Eth 1/11 00 -10-b5-62-03- 74 1 Learned Co...
Page 28 - Spanning Tree; Bridge Settings
Spanning Tree The Spanning Tree page contains links to pages that allow you to specify the parameters of the Spanning Tree Protocol: l Bridge Settings l Port Settings l Trunk Settings Bridge Settings The Bridge Settings page contains the following information: l Bridge ID — Identifies a unique ident...
Page 29 - Port Settings
Example Console(config)#bridge 1 spanning-tree Console(config)#bridge 1 forward-time 15 Console(config)#bridge 1 hello-time 2 Console(config)#bridge 1 max-age 20 Console(config)#bridge 1 priority 40000 Port Settings In the Port Settings page, you can specify Spanning Tree parameters for each port. F...
Page 30 - Trunk Settings; VLAN
Example Console(config)#interface ethernet 1/5 Console(config-if)#bridge-group 1 path-cost 50 Console(config-if)#bridge-group 1 priority 0 Console(config-if)#bridge-group 1 portfast Trunk Settings On the Trunk Settings page, you can specify Spanning Tree parameters for each trunk. For each port numb...
Page 31 - VLAN Membership; Adding a VLAN Group; Removing a VLAN Group
l VLAN Membership l Port Settings l Trunk Settings l GVRP VLAN Membership On the VLAN Membership page, you define VLAN groups. The following options are available: l Show VLAN — Select the VLAN for which you want to edit the membership setting. l Name — Specifies user-defined name of the VLAN. l VLA...
Page 35 - Class of Service
Example Console(config)#bridge-ext gvrp Console(config)# Class of Service Class of Service (CoS) allows you to assign priority to data packets when traffic in the switch is buffered due to congestion. This switch supports CoS by using four priority queues for each port. Data packets in a port's high...
Page 36 - Traffic Classes
CLI Commands The following table summarizes the equivalent CLI command for items in the Class of Service/Trunk Settings page. Example Console(config)#interface port-channel 2 Console(config-if)#switchport priority default 5 Traffic Classes On the Traffic Classes page, you can configure the mapping o...
Page 37 - Queue Scheduling
Console(config-if)#queue cos-map 2 4 5 Console(config-if)#queue cos-map 3 6 7 Console(config-if)#exit Console(config)#exit Console#show queue cos-map Information of Eth 1/1 Queue ID Traffic class -------- ------------- 0 0 1 2 1 3 2 4 5 3 6 7 . . . Que...
Page 38 - IP Precedence/DSCP Priority Status
-------- ------ 0 1 1 4 2 16 3 64 Console# Layer 3/4 Priority The Layer 3/4 Priority page contains links to the following pages: l IP Precedence/DSCP Priority Status l IP Port Priority IP Precedence/DSCP Priority Status You can assign Layer 3/4 priority to...
Page 40 - IP Port Priority
Example Console(config)#map ip precedence Console(config)#interface ethernet 1/5 Console(config-if)#map ip precedence 1 cos 1 Console(config-if)#exit Console(config)#map ip dscp Console(config)#interface ethernet 1/5 Console(config-if)#map ip dscp 1 cos 0 Console(config-if)#exit Console#show map ip ...
Page 42 - SNMP; Communities
l If the target switch has also enabled LACP on the connected ports, the trunk will automatically activate. l If more than four ports attached to the same target switch have LACP enabled, the additional ports enter standby mode and will only be enabled if one of the active links fails. l STP, VLAN, ...
Page 43 - Traps
On the Communities page, you can create different communities and customize access. The public string has read-only privileges by default. The following options are available: l SNMP Community Capability — Indicates that the switch supports up to five community strings. l Community List — Displays a...
Page 44 - Multicast Support; IGMP Setting
CLI Commands The following table summarizes the equivalent CLI commands for items in the SNMP/Traps page. Example Console(config)#snmp-server host 10.1.19.23 Console(config)#snmp-server enable traps link-up-down Console(config)# Multicast Support Multicasting is used to support real-time programs su...
Page 46 - IGMP Member Port Table; Multicast Router Port Settings
Query time -out: 300 sec IGMP snooping version: Version 1 Console# IGMP Member Port Table You can use the IGMP Member Port Table page to assign ports that are attached to hosts that are supposed to receive a specific multicast service. The following options are available: l VLAN ID — Specifies ...
Page 47 - Statistics; Chart
The following options are available: l VLAN ID — Specifies the VLAN ID l Port/Trunk Toggle Buttons — Allows you to select ports or trunks that are attached to a neighboring multicast router/switch by toggling the value of the port/trunk button: ¡ 'S' — Statically attaches a port or trunk to a multic...
Page 50 - VLANs and Frame Tagging; Assigning Ports to VLANs
Back to Contents Page VLANs Dell™ PowerConnect™ 3248 Systems User's Guide VLANs and Frame Tagging VLAN Configuration Automatic VLAN Registration VLAN Examples VLANs and Frame Tagging The PowerConnect 3248 switch supports IEEE 802.1Q-compliant virtual LANs (VLANs). This capability provide...
Page 51 - Automatic VLAN Registration
belongs. Port Overlapping Port overlapping can be used to allow access to commonly shared network resources among different VLAN groups, such as file servers or printers. If you implement VLANs that do not overlap but still need to communicate, you must connect them using a router or Layer 3 switch....
Page 52 - VLAN Examples; Example 1
VLAN Examples The following four examples demonstrate typical web-interface VLAN configurations for the switch. l Example 1 demonstrates a simple two-group VLAN setup. l Example 2 demonstrates a more elaborate setup, illustrating all possible scenarios for a comprehensive understanding of tagged VLA...
Page 53 - Example 2
Example 2 Example 2 illustrates a more complicated setup and demonstrates several scenarios for configuring VLANs. 1. Set up four VLANs, as shown in following table. All switch ports remain as members of the default VLAN (VLAN ID 1). 2. Set up the Port VLAN IDs (PVIDs), as shown in the following...
Page 54 - Example 3
The PVID of a port must be set to a VLAN ID of which the port is an untagged member. 3. Return to the VLAN Membership page and remove the ports configured in this example (1, 2, 4, 5, 10, 11, 12, 14) from VLAN 1. The VLANs set up in the this example procedure produce the following results: l If an...
Page 55 - Example 4
2. From the core switch web interface, go to the VLAN/GVRP page and ensure that GVRP Status is set to enabled . 3. For the other three switches, ensure that GVRP is enabled globally in the VLAN/GVRP page, as well as on ports connecting to the core switch in the VLAN/Port Settings page. With GVRP...
Page 57 - Appendix; Troubleshooting; LEDs; Management Access
Back to Contents Page Appendix Dell™ PowerConnect™ 3248 Systems User's Guide Troubleshooting Downloading Firmware Through the Console Port Technical Specifications Getting Help Regulatory Notices Troubleshooting This section explains how to isolate and diagnose problems with the switc...
Page 58 - Layer 2 Switch Connections; Layer 3 Switch Connections
¡ The switch is powered up. ¡ You have a valid network connection to the switch and the port you are using has not been disabled. l Simple Network Management Protocol (SNMP) management software cannot access the switch. Ensure that: ¡ You have configured the switch's management VLAN with a valid IP ...
Page 59 - Downloading Firmware Through the Console Port
In the preceding figure, the management VLAN is different on each switch, with the Layer 3 switch interconnecting the VLANs. The ports that interconnect the switches are configured as tagged ports. The ports on the Layer 3 switch that connect to the other switches must be configured as members of th...
Page 60 - Technical Specifications
7. Set your computer's terminal emulation software to match the 115200 baud rate. Press <Enter> to reset communications with the switch. Select> Change baudrate [A]9600 [B]115200 Baudrate set to 115200 8. Before you download the firmware, ensure that the switch has sufficient flash memo...
Page 61 - Getting Help; Technical Assistance; Online Services
Getting Help Technical Assistance If you need help with a technical problem, Dell is ready to assist you. 1. Make a copy of the Diagnostics Checklist and fill it out. 2. Use Dell's extensive suite of online services available at Dell Support ( support.dell.com ) for help with installation and tr...
Page 62 - Problems With Your Order
AutoTech Service Dell's automated technical support service — AutoTech — provides recorded answers to the questions most frequently asked by Dell customers about their portable and desktop computers. When you call AutoTech, use your touch-tone telephone to select the subjects that correspond to your...
Page 70 - Regulatory Notices; FCC Compliance Statement; Class A
Regulatory Notices FCC Compliance Statement This equipment generates and uses radio frequency energy. If not installed and used properly, in strict accordance with the instructions provided with the equipment, it might cause interference to radio and TV communication. The equipment has been tested a...
Page 71 - Class A ITE
l EN 61000-3-2 — "Electromagnetic Compatibility (EMC) - Part 3: Limits - Section 2: Limits for Harmonic Current Emissions (Equipment Input Current Up to and Including 16 A Per Phase)." l EN 61000-3-3 — "Electromagnetic Compatibility (EMC) - Part 3: Limits - Section 3: Limitation of Vo...
Page 72 - Caution: Safety Instructions; General; Rack Mounting of Systems
Back to Contents Page Caution: Safety Instructions Dell™ PowerConnect™ 3248 Systems User's Guide Use the following safety guidelines to ensure your own personal safety and to help protect your system from potential damage. General l Observe and follow service markings. Do not service any product exc...
Page 73 - Modems, Telecommunications, or Local Area Network Options; When Working Inside Your System; Protecting Against Electrostatic Discharge
Systems are considered to be components in a rack. Thus, "component" refers to any system as well as to various peripherals or supporting hardware. CAUTION: Installing systems in a rack without the front and side stabilizers installed could cause the rack to tip over, potentially resulting i...
