Instruction/ maintenance manual of the product PC2748 Dell
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www .dell.com | support.dell.com Dell™ PowerConnect™ 27XX Sy stems User’ s Guide.
Notes, Notices, and Cautions NOTE: A NOTE indicates important info rmation that helps you make better use of your computer . NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. CAUTION: A CAUTION indicates a potential for pro perty damage, personal injury , or death.
Contents 3 Contents 1 Introduction Sy stem Descriptio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8 1-Gigabit Ethernet Ports . . . . . . . . . . . . . . . . . . . . . . . 7 16 1-Gigabit Ethernet Ports . . . . . . . . . . . . . . . . . .
4 Contents Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Internal Power Supply Connector . . . . . . . . . . . . . . . . . . . 24 3 Installing the Dell™ PowerConnect™ 27XX Installation Precautions . . . . . . . . . .
Contents 5 Resetting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Displaying Configuration on Demand . . . . . . . . . . . . . . . . . . . . 42 6 Configuring Sy stem Information Defining Switch Informatio n . . . . . . . . . .
6 Contents.
7 1 Introduction This User ’s Guide contains the information needed for in stalling, configuring and maintaining the P owerConnect 2708, P owerConnect 2716, P o werConnect 2724, and P owerConnect 2748 W eb- managed Gigabit Ethernet s witches.
8 16 1-Gigabit Ethe rnet Ports The following figure illustrates the P owerCon nect 2716 front panel. Figure 1-2. PowerConnect 2716 Front Panel The P owerConnect 2716 switch supports 16 GbE copper ports. 24 1-Gigabit Ethe rnet Ports + 2 SFP Combo ports The following figure illustrates the P owerCon nect 2724 front panel.
9 Features General Features Head of Line Blocking Prevention Head of Line (HOL) blocking results in traffic delays and frame loss caus ed by traffic competing for the same egress port resources. HOL blocki ng queues packets, and the pack ets at the head of the queue are forwarded befor e packets at the end of the queue.
10 Auto Negotiation Auto negotiation allows an Ethernet switch to advertise modes of operation. The auto negotiation function provides the means to ex change informat ion between two Ethernet swi tche.
11 MAC Address Supported Features MAC Address Capacity Support The P owerConnect 2708, 2716, and 2724 switch es support a total of 8K MAC addr esses , and the P owerConnect 2748 supports a total of 16K MAC addr e sses. Auto-Learning MAC Addresses The switch enables MAC addr ess auto-learning fr om incoming packets.
12 VLAN Supported Fe atures VLAN Support VLANs are collections of switching ports that co mprise a single broadcast domain. P ackets are classified as belonging to a VLAN based on either the VLAN tag or based on a combina tion of the ingress port and package contents.
13 A CoS is defined by the user , whereby packets ar e related to the same Class of Service. After a packet has been classified, it is assigned to one of the queues. The P owerConnect 2708/2716/2724 /2748 system can classify accordin g to IPv4 information (DSCP).
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15 2 Hardware Description Switch Port Configurations PowerConnect 2708/2716/2724 /2748 Front Panel Port Description The Dell™ P owerConnect™ 2708, 2716, 2724 and 2748 switches use 10/100/1000BASE- T ports on the front panel for connecting to a network.
16 Figure 2-2. PowerConnect 2708 Back Panel Figure 2-3. PowerConnect 2716 Front Panel On the front panel, there are 16 ports, which are numbered 1 to 16, top down and le ft to right.
17 Figure 2-5. PowerConnect 2724 Front Panel On the front panel there ar e 24 po rts which are number ed 1 to 24, top down and left to right. On each port there ar e LEDs to indicate the po rt status. There ar e two SF P (Small F orm-F actor Plugable) ports, designated as ports 23 and 24 , for fiber connection.
18 Figure 2-7. PowerConnect 2748 Front Panel On the front panel, ther e are 48 ports, which are number ed 1 to 48, top down and left to right. On each port, ther e are LEDs to indicate th e port status. There ar e four SFP (Small F orm- F actor Plugable) ports, designated as ports 45 , 46, 47 and 48, for fiber connection.
19 Phy sical Dimensions The P owerConnect 2708 switch has the following physical dimensions: • Height — 43.2 mm (1.7008 in.) • W idth — 256 mm (10.079 in.) • Depth — 161.7 mm (6.366 in.) The P owerConnect 2716 and P owerConnect 2724 swit ches have the followin g physical dimensions: • Height — 43.
20 Fan LED (2748 only) On the P owerConnect 2748 front panel there is a fan LED. The following table describes the fan status LED indications. Port LEDs 10/100/1000BASE-T Port LEDs Each 10/100/1000BASE- T port has two LEDs. Speed/Li nk/Activity is indicate d on the left LED and the duplex mode is indicated on the right LED.
21 SFP Port LED The following table describe s the SFP LED indications. Managed Mode Butt on The P owerConnect 2708/2716/2724/2748 has a Mana ged M ode push button on the front panel. The Managed Mode button is for changing between Managed Mode and Unmana ged (or Secure) Mode.
22 Switch V entilation Fan The P owerConnect 2748 swit ch has thr ee fans an d the P owerConnect 2724 switch has one fan for system ventilation. The P owerConnect 2708 and P owerConnect 2716 devices have no internal fans.
23 T able 2-7. RJ-45 Pin Number Allocation for 10/100/ 1000BASE-T Ethernet Port SFP Ports The P owerConnect 2724 switch support s two SFP transceivers combo ports , and the P owerConnect 2748 switch supports four SFP transceivers combo ports for various fiber -base d modules (1000BASE-SX or 1000BASE-LX).
24 Pin Connections for SFP Interfaces T a ble 2-8. SFP Pin Connections Power Connectors The P owerConnect 2708/27 16/2724/2748 switches are power e d by using the AC internal power supply .
25 3 Installing the Dell™ PowerConnect™ 27XX This chapter con tains information about u npacking, installa tion procedures, and how to make cable and port connections for the P owerC onnect 2708, 2716, 2724, and 2748 devices.
26 to Managed Mode. Th e chapter "Starting and Configur ing the Dell™P owerConnect™ 2708/2716/2724/27 48 for Managed Mode Operation" explains how to set the switch to Managed Mode. Site Requirements The P owerConnect 2708/27 16/2724/2748 devices can be mounted in a standard equipment rack, placed on a tabletop, or mounted on the wall.
27 Handling Static Sensitive Devices NOTICE: Static electricity can damage electronic Ethernet switch sy stem. T o avoi d damage, keep static- sensitive Ethernet switches in their static-protective packages until they are ready to be installed.
28 Mounting the Device The following mounting instruct ions apply to the P owerConnect 2708/2716/2724/2748 devices. There ar e three device mounting options: • Installing in a Rack • Installing on.
29 Installing the Device The following mounting inst ructions appl y to all three hardware configurations of P owerConnect 2708, 2716, 2724 and 27 48 devices.
30 Installing the Device on a Flat Surface The device can be installed on a flat surface, such as a desk-top, if it is not installed on a rack or on a wall.
31 7 Secure the unit to the wall with screws (not provided). Ensure that the ventilation holes are not obstructed. Figure 3-4. Mounting Device on a Wall Connecting the Device to AC Power Supply 1 Using a 5-foot (1.5 m) standard power cable with sa fety ground connected, connect the power cable to the AC connector located on th e back panel.
32 Figure 3-5. Back Panel Power Connector 2 After connecting the device to a pow er source, confirm that the device is connected and operating correctly by e xaminin g the LEDs on the front panel.
33 4 Starting and Configuring the Dell™ PowerConnect™ 27XX NOTE: Before proceeding, read the release notes for this product. The release notes can be downloaded from support.dell.com . NOTE: It is recommended that the most recent revision of the user documentati on is obtained from the Dell Support W ebsite at support.
34 The following information must be obtained from the network administrator before configuring the device: • The IP address to be assigned to the VLAN 1 interface thr ough which the device is to be managed (by default, every port is a me mb er of the VLAN 1 in Mana ged Mode).
35 2 Enter the IP address, Subnet Mask and De fault Gateway as supplied by th e System Administrator . 3 Click Apply Changes . The switch is configured with the updated configuration parameters.
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37 5 Using the Dell OpenManage™ Switch Administrator This section provides an introduction to the Em bedded W eb Server (EWS), which serves HTML pages through which the user can monitor the switch interface. Understanding the Interface The home page contains a T ree V iew — located on the left side of the home page.
38 The following table lists the interface comp onents with th eir corresponding numbers. T able 5-1. Interface Components Component Description 1 The tree view contains a li st of the different Ethernet switch featur es. The functions in the tree view provide a view of all the components under a specific feature.
39 Using the OpenManage Switc h Administrator Buttons This section describes the buttons found on the Dell™ P owerConnect™ OpenManage Switch Administrator interface. Information Buttons Information buttons provide access to on-line support and online help, as well as information about the OpenManage Switch Administrator interfaces.
40 Starting the Application 1 Open a W eb browser . 2 Enter the Ethernet Switch IP ad dress (the default IP address is: 192.168.2.1) in the address bar and press <Enter> . F or information about assignin g an IP address to the Ethernet Switch, see " V iewi ng System IP Address .
41 Resetting the Device The Reset page resets the device. T o open the Reset page, click Res e t in the tree view . Figure 5-2. Reset 1 Click Res et . A confirmation message displays.
42 Displaying Configuration on Demand The EWS shorte ns user wait time by provi ding Data Display on D emand. When the system retrie ves vast amounts of configuratio n data, the data is divided into groups.
43 6 Configuring Sy stem Information This section provides information for defining syst em parameters including switch status fe atures, downloading switch software, an d modifying switch parameters.
44 Asset T ag (0-16 Characters) — Specifies the user-defined switch r eference. Service T ag — The service refer ence number used when servicing the switch. System Name (0-32 Characters) — Defines the user-defined switch name. Location Name (0-32 Characters) — The location where the system is curr ently running.
45 Figure 6-2. IP Addressing DHCP — T h e D H C P c l i e n t c a n b e e n a b l e d t o a c q ui r e the network configu ration dynamically . The DHCP default value is Disable . This field enabl es the DHCP cl ient. IP Address — Specifies the static IP Address currently assigned to the device.
46 Configuring DHCP Client 1 Open the IP Addressing page. 2 Change the DHCP to Enable . 3 Click Apply Changes . The switch requests from the DHCP server to assign a new dynamic IP Address, Subnet Mask, and Default Gateway Address to manage the device.
47 Defining Interface Configuration The Interface Configuration page enables the user to set the po rt parameters, such as port speed, port type, and additional port operational attributes. T o open the page , click Interface Configuration in the tree view .
48 Current P ort Speed — The actual synchronize d port speed, in bits p er second. Admin Duplex — F ull Duplex (FDX) indicates that the sw itch interface supports transmission between the device and an other station, in both directions simultaneous ly .
49 Aut o — Use to automatically detect the cable type. Current MDI/MDIX — Displays the current MDI/MDIX status of the port. LAG — Specifies if port is a part of a LAG (Link Aggregated Group). Configuring the Interface 1 Open the Interface Configuration page.
50 Current — Shows what the curr ent status is for Jumbo F rames suppor t. After Reset — Indicates the Jumbo F rames status after the next time the switch is powered on. Enabling Jumbo Frames 1 Open the Jumbo F rames page. 2 Select Enabled in the Jumbo F rames field.
51 Blank — The interface is not a VLAN member . P ack ets associated with the interface are not forwarded. Show VLAN ID — Displays the list of the VLAN IDs as d efined in the switch . Create VLAN — Designates the ID of the particular VLAN defin ed.
52 Figure 6-6. VLAN Interface Settings Interface — Indicates the interface number of the port, LAG, or VLAN that is configured on the switch. PVID (1-4095) — Assigns a VLAN ID to untagged packets. The possible field values are 1-4094. VLAN 1 is used as the defa ult VLAN.
53 The LAG Aggregation Con figuration page displays the LAGs defined, and the ports aggregated and assigned to them. T o open the p age, click LAG Mem bership in the tree view . Figure 6-7. LAG Aggregation Configurfation Po r t s — Specifies the port(s) aggregated into the LAG and assigned to which LAG.
54 Managing Sy stem Files Use the F ile Management section to manage switch software, the image file, and the configuration files. F iles can be downloaded or uploaded via a TFTP server . This applies to the P owerConnect 2748 switch configuration only .
55 Downloading Files From Server The Fi l e D o w n l o a d page contains fields for downloading file s from the TFTP server . T o open the page, click F ile Download in the tree view .
56 Figure 6-9. File Download (PowerCo nnect 2748 Switch Configur ation) Fi r m w a r e D o w n l o a d — The F irmware file is downloaded. If Fi r m w a r e D o w n l o a d is selected, the Configuration Download fields are grayed out. Configuration Download — The Configuration file is downloaded.
57 Configuration Download Server IP Addr ess (1-159 Characters) — The Server IP Address fro m which the configuration files are downloaded. Source File Name — Indicates the configuration files to be downloaded . Downloading Files from Server 1 Open the F ile Download page.
58 Destination F ile Name (1-159 Characters) — Indicates the Configuration file path to which the file is uploaded . NOTE: This list of user -defined configuration files on ly appears if the user created backup configuration files.
59 Use Saved IP — Uses the saved IP address for device configuration, when selecte d. Use Current IP — Uses the current IP address for de vice configura tion, when selected. Default User — Uses the default user for devi ce con figuration, when selected.
60 Local User Databa se The Loc al Use r D at aba se page contains fields for def ining User Names, P asswords and access Level. T o open the page, click the Loc al Us er Dat ab as e in the tree view . Figure 6-12. Local User Database User Name (1-20 Characters) — Defines a User -defined user name.
61 Adding a User to the Local User Database 1 Open the Loc al Us er D at aba se page. 2 Select New and enter the field. 3 Complete the fields for the new user . 4 Click Apply Changes. The new user information is saved and the switch is updated. Deleting a User from the Local User Datab ase 1 Open the Loc al Us er D at aba se page.
62 Figure 6-13. Integrated Cable T est Po r t — The port to which the cable is connected. T est Result — Specifies the cable tes t results. One of the following results may apply : No Cable — There is no cable connected to the port. Open Cable — The cable is not connected on the other side.
63 Optical T ransceive rs Diagnostics The Optical T ransceivers Diagnostics page contains fields for performing tests on F iber Optic cables. The optical transceiver pr ovides access to a set of parame ters that can be monitored and displayed to the system admin istrator .
64 3 Click show All . The test is performed and the Optical T r ansceiver Diagnostics test table opens. Port Mirroring The P ort Mirroring mechanism moni tors and mir rors the network tra ffic by forwarding copies of incoming and outgoing packets from monitored ports (up to four ports) to a monitoring port.
65 Enabling Storm Control When Layer 2 frames are forwarded, Broadcas t, Multicast and Unknown Unicast frames are flooded to all ports on the designated VLANs on the switch.
66 Broadcast Rate Threshold (70-285000) — The rate of Broadcast thre shold ranges fro m 70-285,000 packets per second. The default value is zero . Modifying PowerConnect 2708 Storm Control Port Param eters 1 Open the Storm Control page. 2 Enter the fields.
67 Po r t — The port from which the storm control is enabled. Broadcast Control — Enables or dis ables forwarding Broadcast packets on the switch. The default is Disable . Modifying PowerConnect 2716/2724 Storm Contro l Port Parameters 1 Open the Storm Control page.
68 The range is 3500 - 1000000. The default value is 3500. Modifying PowerConnect 2748 Storm Control Port Param eters 1 Open the Storm Control page. 2 Enter the fields. 3 Click Apply Changes . The Storm Control port parameters ar e saved to the P owerConnect 2748 switch.
69 7 Configuring Quality of Service This section provides information for defining and configuring Quality of Service (QoS) parameters. Quality of Service (QoS) Overview An implementation example that.
70 P ackets arriving u ntagged are assigned a default VPT value, which is set on a p er port basis. The assigned VPT is used to map the packet to the egress queue. DSCP values can be mapped to priority queues. DSCP mapping is enabled on a per-system basis.
71 Defining CoS Settings Class of Service global parameters are set from the CoS Settings page. Configuring QoS Settings The CoS Settings page contains fields for enabling or disabling CoS. In addition, the T rust mode can be selected. The T rust Mode relies on predef ined fields within the packet to determine the egress queue.
72 NOTE: The interface T rust settings ove rrides the global T rust setting. Strict P riority — Specifies if traffic sche duling is based strictl y on the queue priority . This is the default value for queues. WRR — Specifies if traffic scheduling is base d on the W e ighted Round Robin (WRR) weights to assigned egress queues.
73 Mapping a CoS value to a Queue 1 Open the Cos to Queue page. 2 Define the egress queue for each CoS value. 3 Click Apply Changes . The CoS value is mapped to an egr ess queue, and the switch is updated. Mapping DSCP V alues to Queues The DSCP to Queue page provides fields for defining egre ss queue to specific DSCP fields.
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75 8 V iewing Statistics RMON Statistics Remote Monitoring (RMON) is an extension to the Si mple Network Management P rotocol (SNMP) which provides network traffic statistics. RMON defin es current and historical MAC-layer statistics and control objects, allowing real-tim e information to be captured across the entire network.
76 Received Bytes (Octets) — Number of octets received on the interface since the system was last reset. This number includes bad packets and FCS octets, but ex cludes framing bits. Received P ackets — Number of packets r eceived on the in terface, including ba d packets, Multicast and Broadcast packets, since the system was last reset.
77 Glossary This glossary contains key technical words of interest. A Auto-negotia tion Allows 10/100 Mpbs or 10/100/1000 Mbps Ethernet ports to establish for the following featur es: • Duplex/ Half.
78 Broadcast Storm An ex cessive amount of broadcast messages simultaneous ly transmitted across a network by a single port. F orwarded message responses are heaped onto the netw ork, overloading network resources or causing the network to time out. C Class of Service Class of Service (CoS).
79 F Flow Control Enables lower speed Ethernet switch modules to communicat e with higher speed Ethernet switch module s, that is, that the higher speed Ethernet switch module refrains from send ing packets. Fr a g m e n t Ethernet packets smaller than 576 bits.
80 Ingress P ort P orts on which network traffic is received. IP Internet P rotocol. Specifies the format of packets and there ad dressing method. IP addr esses packets and forwards the pack ets to the correct port. IP Address Internet Protocol Address.
81 MAC Layer A sub-layer of the Data Link Control (DTL) layer . Managed Mode P rovides switch management through a web int erface, and maintains the device configuration through power cycles. Mask A filter that includes or ex cludes ce rtain values, for example parts of an IP address.
82 A set of rules that govern s how Ethernet switch modu les ex change information across networks..
83 Q QoS Quality of Service. QoS allows network managers to decide how an d what network traffic is forwar ded accord ing to priorities, application types, an d source and destination addresses. R RMON Remote Monitoring. Pr ovide s network information to be collected from a single workstation.
84 TFT P T rivial F ile T ransfer Protocol. Uses User Data P rotocol (UDP) without security features to transfer files. Tr u n k i n g Link Aggregation . Optimizes port usage by linking a group of port s together to form a single trunk (aggregated groups).
An important point after buying a device Dell PC2748 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Dell PC2748 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Dell PC2748 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Dell PC2748 you will learn all the available features of the product, as well as information on its operation. The information that you get Dell PC2748 will certainly help you make a decision on the purchase.
If you already are a holder of Dell PC2748, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Dell PC2748.
However, one of the most important roles played by the user manual is to help in solving problems with Dell PC2748. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Dell PC2748 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
