H3C MSR 30-16 Installation Manual
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H3C MSR 30-16 Installation Manual

H3C MSR 30-16 Installation Manual

Msr 30 series routers
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H3C MSR 30 Series Routers
Installation Manual
(v1.00)
MSR 30-11
MSR 30-16
MSR 30-20
MSR 30-40
MSR 30-60
BOM: 3104A10T
www.3Com.com
Part Number: 10016320 Rev. AA
August 2007

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Summary of Contents for H3C MSR 30-16

  • Page 1 H3C MSR 30 Series Routers Installation Manual (v1.00) MSR 30-11 MSR 30-16 MSR 30-20 MSR 30-40 MSR 30-60 BOM: 3104A10T www.3Com.com Part Number: 10016320 Rev. AA August 2007...
  • Page 2 LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

  • Page 3: Get The Latest Documentation And Software For Your H3C Router

    AND SOFTWARE FOR YOUR H3C R OUTER Thank you for purchasing an H3C MSR 30 Series router. As part of our commitment to help you get the most out of your H3C network equipment, we offer updated documentation and software on our website.
  • Page 4 H3C R ET THE LATEST DOCUMENTATION AND SOFTWARE FOR YOUR OUTER...

  • Page 5: Table Of Contents

    ONTENTS ET THE LATEST DOCUMENTATION AND SOFTWARE FOR YOUR H3C R OUTER BOUT UIDE Conventions Related Documentation VERVIEW Introduction System Description Generic Modules NSTALLATION REPARATIONS Requirements on Environment Safety Precautions Installation Tools, Meters and Equipment NSTALLATION Installation Process Installing Cabinets...
  • Page 6 Upgrading BootROM Through Serial Port Upgrading Application Program Through Serial Port Upgrading Application Program Through Ethernet Interface Maintaining Application Program and Configurations Through Command Lines Maintaining Application Program and Configuration File Dealing with Router Password Loss Backing up and Restoring BootROM...

  • Page 7: About

    BOUT UIDE This guide describes the H3C MSR 30 Series Routers and how to install hardware, configure and boot software, and maintain software and hardware. This guide also provides troubleshooting and support information for your router. This guide is intended for qualified service personnel who are responsible for configuring, using, and managing the routers.

  • Page 8: Related Documentation

    Convention Description Words in italics Italics are used to: Emphasize a point. Denote a new term at the place where it is defined in the text. Identify menu names, menu commands, and software button names. Examples: From the Help menu, select Contents.

  • Page 9: Overview

    (MIMs). Currently, the MSR 30-11 can adopt AC only, the MSR 30-16 can adopt AC and PoE, and the MSR 30-20, 30-40 and 30-60 can adopt AC, DC, and PoE. Except the MSR 30-11 and the AC-powered MSR 30-16, the MSR 30 series routers each provide a redundancy power system (RPS) interface to enhance the routers’...
  • Page 10 VCPM The height of MIM cards may be one U (44.45 mm or 1.75 in.) or half a U. Slot 5 and slot 6 on the MSR 30-20, MSR 30-40, or MSR 30-60 are both half a U high.
  • Page 11 System Description Table 4 Hardware specifications for the H3C MSR 30 series routers Item MSR 30-11 MSR 30-16 MSR 30-20 MSR 30-40 MSR 30-60 AC input Rated voltage Rated voltage Rated voltage Rated voltage Rated voltage range: 100 range: 100...
  • Page 12 (9) SIC slot 1 (10) SIC slot 2 Panel LEDs Table 5 LEDs on the front panel of the H3C MSR 30-11 Description ON: The power supply of the system works normally. OFF: The power supply of the system is disconnected.
  • Page 13 Steady yellow means the CF card is in place but cannot be identified by the router. OFF means no CF card is inserted or the CF card cannot be identified. Table 8 Rear panel LEDs of H3C MSR 30-16 Router...
  • Page 14 Solid green means an ESM is in the ESM slot and operates normally. Blinking green means the ESM is processing data. Solid yellow means an ESM is in the ESM slot but does not operate normally. VCPM OFF means VCPM is not in the slot.
  • Page 15 Blinking green means data is being transferred to/from the host and the host cannot be removed now. CF card LED: Steady green means the CF card is in the slot and can be identified by the router. Blinking green means the CF card is being accessed and cannot be removed.
  • Page 16 Steady green means an ESM is in the ESM slot and operates normally. Blinking green means the ESM is processing data. Steady yellow means an ESM is in the ESM slot but does not operate normally. VCPM OFF means no VCPM is in the slot.
  • Page 17 (19) MIM slot 7 (20) MIM slot 8 (21) Grounding terminal Panel LEDs Table 11 Front panel LEDs description of H3C MSR 30-40 router Description Power LED: ON means the system provides power for cards normally. OFF means the system does not supply power for cards.
  • Page 18 Table 11 Front panel LEDs description of H3C MSR 30-40 router Description CF card LED Steady green means the CF card is in the slot and can be identified by the router. Blinking green means the CF card is being accessed and cannot be removed.
  • Page 19 System Description H3C MSR 30-60 Router Appearance 1 Front view Figure 9 Front view of H3C MSR 30-60 (3) (2) (11) (10) (1) Power LED (PWR) (2) System LED (SYS) (3) USB LED (4) Console port (CON) (5) Auxiliary port (AUX)
  • Page 20 Blinking green means data is being transferred to/from the host and the host cannot be removed now. CF card LED: Steady green means the CF card is in the slot and can be identified by the router. Blinking green means the CF card is being accessed and cannot be removed.

  • Page 21: Generic Modules

    DSIC card. A PoE-capable interface card can supply power remotely only when it is installed in a PoE router. If it is installed in a non-PoE router, it serves as an ordinary switching module only.
  • Page 22 A MIM card occupies one ordinary MIM slot, a DMIM card occupies two ordinary (horizontal) MIM slots, and an XMIM card occupies one MIM slot but its size is between a MIM card and a DMIM card. Currently, XMIM cards are used only on the MSR 30-11.

  • Page 23: Installation Preparations

    0°C to 40°C (32°F to 104°F) 5% to 90% (non-conducting) Requirements on Dust is harmful to the safe operation of the Router. Dust on the chassis may result Cleanness in static absorption, thus causing poor contact of the metal connection components or points.
  • Page 24 To protect the router from lightning better, the following should be considered: Ensure the PGND wire of the chassis is well grounded. ■ Ensure the ground point of the socket of AC power supply is well grounded. ■...

  • Page 25: Safety Precautions

    Requirements on When installing H3C MSR 30 Series Routers, observe the following: Workbench There is spacing reserved at the air inlet and outlet in the router so as to ■ facilitate the radiation of the router cabinet. Make sure that the rack has a good ventilation system.
  • Page 26 Meters and equipment Hub or LAN switch ■ Console terminal (it could be a PC) ■ Equipment related to the selected modules ■ Multimeter ■ CAUTION: H3C MSR 30 Series Routers are not shipped with any installation tools, meters, or devices.

  • Page 27: Installation

    NSTALLATION Installation Process Figure 11 H3C MSR 30 Series Routers installation process Start Mount the rack Connect PGND Connect the pow er cord Connect to the console terminal Verif y installation Pow er on Troubleshoot Turn of f the Normal?

  • Page 28: Installing Cabinets

    NSTALLATION Installing Cabinets For cabinet installation methods, refer to the part discussing cabinet installation. Skip this section if you want to mount your router on the tabletop or the rack of another vendor. Installing the Router Install the router after you have completed the installation preparations.

  • Page 29: Installing Generic Modules

    Figure 12 Installing H3C MSR 30 Series Router in a rack (1) Mounting ear (2) Guide Figure 13 Installing ears on the rear panel of the H3C MSR 30 Series Router Installing Generic Installing generic modules includes installing the memory, ESM cards, and FICs. For...

  • Page 30: Connecting The Pgnd

    As shown in the following figure, the router provides a protection ground (PGND) screw at the top right-rear of the chassis. You must securely connect it to the earth ground to safely channel faradic current and leakage electricity to the ground and have the device less susceptible to electromagnetic interference (EMI).This PGND...
  • Page 31 Connect the other end of the cable to an AC power source at your installation site. Step 3: Place the power switch of the router to the ON position. Step 4: Check that the PWR LED on the front panel of the router is on for correct connection. Connecting the DC...
  • Page 32 (2) DC input Connecting the DC power cord Figure 17 Sketch map of DC power cord Table 21 Connection of the DC power cord between the DC power supply and the router -48 VDC power supply Router X2 (-48 VDC connector, blue) X1.A1...
  • Page 33 Connecting the Power Cord Connecting the RPS RPS power Power Cord Figure 18 RPS power Connecting the RPS power cord Figure 19 Prize the protective barrier of RPS Figure 20 Take the protective barrier of RPS...

  • Page 34: Connecting The Console Terminal

    Console cable is an eight-wire shielded cable. At one end of the cable is a crimped RJ-45 connector to the console port on the router; at the other end of the cable is a DB-9 (female) connector to the serial port on the console terminal.

  • Page 35: Fixed Interfaces

    Follow these steps to connect the router to a console terminal: Step 1: Select a console terminal. It can be a standard ASCII terminal with an RS232 serial port, or more commonly, a PC. Step 2: Connect the console cable.
  • Page 36 ■ connectors in different sequences. The cable connects the same category of devices, such as PC to PC or PC to router. You can make crossover cables yourself as needed. In making network cables, shielded cables are preferred for electromagnetic compatibility sake.
  • Page 37 Follow these steps to connect a 10/100/1000 Mbps fiber-optic interface: Step 1: Use two fibers to connect the Rx and Tx ends of the interface to another device: Rx to Tx, and Tx to Rx.

  • Page 38: Interface Card Module

    Connecting the AUX cable Follow these steps to connect the AUX cable. Step 1: Plug the RJ-45 connector of the cable into the AUX port on the main board. Step 2: Plug the DB-25 or DB-9 connector into the serial port on the analog modem.
  • Page 39 Slide Rail Installation on MSR 30-11 and Removal Installing the Slide Rails Figure 26 Install the slide rails into the MSR 30-11 Figure 27 Router view after the slide rail is replaced Removing the Slide Rails Figure 28 Loosen the screws...

  • Page 40: Slide Rail Installation On Msr 30-16/30-20 And Removal

    3: I HAPTER NSTALLATION Slide Rail Installation on MSR 30-16/30-20 and Removal Slide Rails SIC slide rail Figure 30 SIC slide rail Installing the Slide Figure 31 Insert the slide rail into the router Figure 32 Fix the slide rail...

  • Page 41: Slide Rail Installation On Msr 30-40/30-60 And Removal

    Slide Rail Installation on MSR 30-40/30-60 and Removal Uninstalling the Slide Figure 33 Loosen the screws Rail Figure 34 Router view after the slide rail is drawn out Slide Rail Installation on MSR 30-40/30-60 and Removal Slide Rails SIC slide rail...
  • Page 42 3: I HAPTER NSTALLATION Figure 37 MIM slide rail (right) Installing the Slide Rail Figure 38 Install the SIC slide rail Figure 39 Install the MIM slide rail (left) Figure 40 Install the MIM slide rail (right)

  • Page 43: Verifying Installation

    The slide rail is fixed on chassis through special structure. When you need to install a DMIM, you only need to uninstall the rail and install the module. The rail may deviate out of external force when you install a DMIM, thus the DMIM on the other side cannot be installed normally.
  • Page 44 Whether the router is correctly connected to other devices, such as the console ■ terminal. CAUTION: The check after installation is very important. The stability, grounding of the router and power supply will directly affect the operation of the router.

  • Page 45: Startup And Configuration

    TARTUP AND ONFIGURATION Startup You can only configure an H3C MSR 30 router through the console port if it is the first time you use it. Setting up Connecting the router to a console terminal Configuration To set up the local configuration environment, RJ-45 connector of the console...
  • Page 46 2 Setting terminal parameters. As shown in the following table, in the properties dialog box of the serial interface, set the baud rate to 9600, data bit to 8, no parity check, stop bit to 1, and flow control to none. Then, click <OK> to return to the...
  • Page 47 3 Set HyperTerminal properties. Select [FilePropertiesSettings] in the HyperTerminal to enter the properties setting window as shown in the following figure. Select the terminal emulation type to be VT100 or auto detect, and click <OK> to return to the HyperTerminal window.
  • Page 48 ■ WARNING: Before powering on the router, the user should be aware where the switch of the power supply to the router is located, so that the power supply can be disconnected in time once accidents occur. Powering on the router Turn on the site power.
  • Page 49 Startup For local configuration, after you power on the router, you can see the startup banner. See “Startup Process” on page 49. 3 After completing the power-on self-test (POST), the system asks you to press <Enter>. When the prompt appears, you may proceed to configure the router.

  • Page 50: Configuration Fundamentals

    Press ENTER to get started. Press <Enter> and the screen will display: <H3C> This prompt indicates that the router has entered the user view, and now the router can be configured. Configuration In general, the configuration steps are as follows:...
  • Page 51 Configuration Fundamentals Step 4: Configure the IP addresses or IPX network numbers of all the interfaces on the router according to the division of the subnets. Step 5: Configure the routes. If it is necessary to enable a dynamic routing protocol, the user should configure the related operating parameters of the protocol.
  • Page 52 4: S HAPTER TARTUP AND ONFIGURATION Figure 47 Slot arrangement on the MSR 30-11 (1) Slot 0 (2) Slot 1 (3) Slot 2 (4) Slot 3 Figure 48 Slot arrangement on the MSR 30-16 (1) Slot 0 (2) Slot 1...
  • Page 53 ■ interface module, from left to right. If you install a MIM-1FE and an MIM-2FE respectively in slot 5 and slot 6 on the MSR 30-20, the Ethernet interfaces are numbered as follows: Fixed Gigabit Ethernet interfaces are Gigabit Ethernet 0/0 and Gigabit Ethernet ■...
  • Page 54 4: S HAPTER TARTUP AND ONFIGURATION...

  • Page 55: Software Maintenance

    BootROM menu and must name it secure.bin. However, you cannot modify this file or change the type of another file to S. If you change the name of the secure boot file with the rename command after the system boots, the file is removed from CF card.
  • Page 56 You can store them in Flash memory, but only one for each. For example, if an M+B file exists, it is impossible to have another M or B file. If you change the file type of another file to B, the M+B file becomes a type M file.
  • Page 57 The extension ASCII characters (ASCII>=128) and invisible characters (ASCII<33) ■ cannot be included in the file name. The following characters cannot be included in the file name: ", ‘, ?, , space, *, ■ |, <, /, :, >, ~.

  • Page 58: Bootrom Menu

    TFTP upgrade upgrade Upgrade BootROM Menu Main BootROM Menu When the router is powered on and reboots, the console terminal displays: InitDDR Proceed to boot, the system prompts: system start booting..Version 2.11 Press CTRL+D to stop auto-boot Booting Normal Extend BootRom Decompressing...done!
  • Page 59 Please input Boot ROM password: You have three chances to provide the correct BootROM password (the initial setting is void). If you fail to do that, you need to reboot the system. After you enter the correct password, the console screen displays.
  • Page 60 Modify serial interface parameter. <6> Exit To Main Menu Exit to the main BootROM menu. Enter Ethernet Interface submenu Enter <3> in BootROM menu to enter the Ethernet interface submenu. The system displays: ====================<ETHERNET SUB-MENU>====================== |Note:the operating device is CF Card | <1>...
  • Page 61 Exit to the main BootROM menu. File control submenu Enter <4> under the main BootROM menu to enter the file control submenu. Through this submenu, the system can display application program file type in memory, modify file name and delete files. The prompt is shown below: ========================<File CONTROL>=======================...

  • Page 62: Upgrading Bootrom Through Serial Port

    Use XModem to upgrade BootROM through serial port. Through Serial Port Modifying Serial Port Sometimes, we need to change the serial baud rate to higher in order to save Parameters upgrading time, or to lower to guarantee transmission reliability. This section depicts how to adjust serial baud rate.
  • Page 63 Since the router serial baud rate is modified to 115200 bps, whereas the terminal baud rate remains to be 9600 bps, they can not communicate with each other. Change the baud rate of your terminal to the same as that for software download. Perform the following operation: Figure 53 Disconnect terminal Click [File/Properties], and press <Configure...>...
  • Page 64 Upgrading BootROM First, enter <7> in the main BootROM menu (refer to “Main BootROM Menu” on page 58) to enter the BootROM operation submenu, under which all BootROM operations are completed. Refer to “BootROM operation submenu” on page 61 for detailed descriptions.

  • Page 65: Upgrading Application Program Through Serial Port

    434432 bytes downloaded! Updating Extend BTM Updating Extended BootRom. Change the baud rate of the console terminal from 115200 bps to 9600 bps, and then reboot the router. The file name, size and path vary in different situations. Check the current ■...

  • Page 66: Upgrading Application Program Through Ethernet Interface

    HAPTER OFTWARE AINTENANCE Generally an application program is more than 10M in size. Even if the baud rate is changed to 115200 bps, the upgrading takes about 30 minutes. Therefore, it is recommended you upgrade through Ethernet interface. Upgrading Application Enter <3>...
  • Page 67 Do not modify the device name of the router; otherwise, the system prompts ■ “Boot device should not be modified” and skips to the next configuration item. Only FE0 port can be used in MSR 20 series, and GE0 port in MSR 30 and MSR ■ 50 series.
  • Page 68 AINTENANCE Updating File main.bin..Update Success! Step 4: Enter <6> to exit to the main BootROM menu. Enter <1> to boot from the CF card. Step 5: Set the updated application program to be the main boot file, i.e. the default boot file of the system.

  • Page 69: Maintaining Application Program And Configurations Through Command Lines

    Enter “1” to set the selected application program to be the main boot file, i.e. the default boot file of the system. Step 6: Enter <5> to exit to the main BootROM menu. Enter <1> to boot from the CF card.
  • Page 70 (TFTP/FTP Client) (TFTP/FTP Server) Configure the IP addresses of the two sides to be in the same network. In this section, the TFTP server is set to 192.168.0.1, and the Ethernet interface connected to it (Ethernet interface 0/0 in this example; so, any interface is OK) is set to 192.168.0.2.
  • Page 71 The FTP service provided by the router is FTP Server, that is to say, the router serves as the FTP Server. You can run FTP Client to log onto the router and access files on the router.
  • Page 72 Step 3: Maintain the router. After booting FTP service of the router and configuring user name and password, you can boot FTP Client on your PC. Take the FTP Client with Windows XP for example: Enter <ftp> in the DOS window, and the system prompts: C:Documents and SettingsAdministrator>ftp...
  • Page 73 ROUTER (TFTP/FTP Client) (TFTP/FTP Server) When the router serves as the client, you can run FTP server program on your PC as the FTP server, and set the server path. Then, add user name and password for the router. Configure the IP addresses of the two sides to be in the same network. In this section, the FTP server is set to 192.168.0.1, and the Ethernet interface connected...

  • Page 74: Maintaining Application Program And Configuration File

    AINTENANCE Maintaining You can modify and display the file type under the file control submenu: Application Program Enter <4> under the main BootROM menu to enter the file control submenu. The and Configuration File system prompts: ========================<File CONTROL>======================= |Note:the operating device is CF Card | <1>...
  • Page 75 Maintaining Application Program and Configuration File You can set the file type to +M, -M, +B and -B by entering 1 to 4. Refer to “Introduction” on page 55 for details. Set configuration file type Enter <3> under the file control submenu to enter the configuration file type menu.

  • Page 76: Dealing With Router Password Loss

    User Password Loss You cannot enter the system if you lose your user password. You can boot the system by neglecting system configuration. Perform the following operations: Step 1: Enter the main BootROM menu, and select <6> to boot by ignoring system...

  • Page 77: Backing Up And Restoring Bootrom

    Updating Back Extended BootRom..Backing Extend BootRom Success! Now, the entire BootROM is backed up to the memory. Enter <2> under the menu to restore the BootROM in the memory to the system: Restore Basic BootRom Updating the Norm Basic BootRom....
  • Page 78 5: S HAPTER OFTWARE AINTENANCE...

  • Page 79: Hardware Maintenance

    Step 2: Remove all cables of interface modules on the back panel (keep the ground cable connected). Step 3: Put the router on level ground and have the back panel face you. Loosen the captive screws fastening the back panel with Phillips screwdriver.
  • Page 80 AINTENANCE Figure 63 Rotate the screwdriver Figure 64 Pull out the chassis cover until it is separated from the chassis Figure 65 Remove and fasten the captive screws of the MSR 30-40/30-60 Figure 66 Open the chassis cover of the MSR 30-40/30-60...
  • Page 81 Opening/Closing the Chassis Cover The installation procedure is just opposite to the removal procedure. ■ You can open/close the chassis cover of an MSR 30-11/30-16 in the way you ■ do for an MSR 30-20. WARNING: On a mounting screw of your router chassis, there is an anti-dismantle seal of ■...

  • Page 82: Internal Structure Of The Router

    (4) SIC slot 2 (5) ESM slot (6) Power module The current version of the MSR 30-11 does not support any CF card, but the later versions will do. Therefore, a CF card slot is reserved on the MSR 30-11.
  • Page 83 Internal Structure of the Router Figure 68 MSR 30-16 internal structure (3) (4) (10) (1) Power module (2) CF card slot (3) VPM (4) ESM slot 1 (5) VCPM slot (6) MIM slot (7) SIC card slot (8) Fan (9) Memory module slot...
  • Page 84 (6) MIM card slot (7) SIC slot (8) Fan module (9) Memory module slot (10) ESM slot 0 Figure 70 Internal structure of the MSR 30-40/30-60 (Before the power module is removed) (1) Power module (2) Power bracket (3) Fan module...

  • Page 85: Removing/Installing A Power Module

    Removing/Installing a Power Module Figure 71 Internal structure of the MSR 30-40/30-60 (After the power module is removed) (1) VPM (2) ESM slot 0 (3) ESM slot 1 (4) MIM card slot (5) SIC card slot (6) Memory module slot...
  • Page 86 ARDWARE AINTENANCE Figure 72 Remove the screws from the bracket Draw out the power bracket and remove the power cord from the main board. ■ Figure 73 Remove the power bracket and the power cord 2 Remove the power module from the bracket Remove the screws ■...

  • Page 87: Installing/Removing A Cf Card

    Figure 74 Remove the screws fastening the power module and the bracket Separate the power module from the bracket ■ Figure 75 Draw out the power module and separate it from the bracket The installation procedure is just opposite to the removal procedure. Installing/Removing a CF Card The MSR 30-11 does not support any CF card.

  • Page 88: Replacing A Memory Module

    Step 1: Push the ejector button into the slot completely, and make sure it only springs out with outside force. Step 2: Press the CF card into the slot in correct orientation, and make sure it only pops up with outside force.
  • Page 89 Hold the memory module by its edge and avoid touching the components on ■ its surface. An improper operation might result in damage. It is normal that you feel hard when removing the memory module, but do not ■ overexert.
  • Page 90 Step 2: Align the connecting fingers of the memory module with the slot on the main board. Step 3: Insert the memory module into the slot in the direction of 45 degrees to the main board. Step 4: Press the top edge of the memory module vertically down until you hear a click.
  • Page 91 Follow the steps below to remove a memory module: Step 1: Make sure all power interfaces are shut down. Step 2: Press the ejector clips on the two sides of the memory module, and pull the memory module outwards horizontally until it separates from the ejector clips and forms an angle of 45 degrees to the main board.

  • Page 92: Replacing A Vpm

    6: H HAPTER ARDWARE AINTENANCE Step 3: Insert the memory module into the slot in the direction of 90 degrees to the main board. Step 4: Press the edge of the memory module vertically down until you hear a click.

  • Page 93: Installing/Removing An Esm/Vcpm Card

    Step 3: Insert the VPM in the direction of 45 degrees to the main board. Step 4: Press the top edge of the VPM module perpendicularly to the main board until the VPM snaps into the slot. At this time, the VPM forms a certain angle to the main board.
  • Page 94 HAPTER ARDWARE AINTENANCE Step 3: Install the card on specified position on the main board, and fasten it on the board. Step 4: Align the card interface with the slot and press down vertically to install the card on the board. Then, align the screw eye with the card bracket.

  • Page 95: Troubleshooting

    ■ The power cord is correctly connected. ■ The power source meets the requirement of the router. If the PSU is DC-input, ■ check the AC/DC OK LED: steady ON means the input voltage is normal. OFF means the input voltage is abnormal.

  • Page 96: Troubleshooting Application Image Upgrade

    Fault occurs because the source file does not exist or the network cable is not connected, or the IP address is not correct. Ensure that the source file is in the TFTP root directory and the cable is connected securely and the IP address is correctly assigned.
  • Page 97 Before you ask your agent for servicing, provide its bar code. If you do not set the parameters such as the host name and gateway, they will ■ not be displayed when you upgrade the router. Therefore, the terminal display...

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