3Com Corporation 3Com Network Jack NJ2000 User Guidance Tom Kinahan 3/12/2009...
3Com Network Jack NJ2000 Contents Contents ................................ 2 Introduction ..............................3 System Information ............................4 System Identity ............................ 5 Address Information ........................... 5 Port Information ..........................5 Trunk Information ..........................6 VLAN Information ..........................6 Port Statistics ..............................7 System Name ..............................9 IP Address ..............................
Troubleshooting ............................44 Introduction There is no separate User Guide manual for the NJ2000. The NJ2000 Web interface includes context relevant help on the administration Web pages. Where you wish to consult this help without connecting to the Switch administration the help text is captured in this document.
3Com Network Jack NJ2000 System Information This page provides an overview of the configuration of the switch. There are five different tables on this page: System Identity - Displays general information about the switch. Address Information - Displays the IP Address configuration of the switch.
3Com Network Jack NJ2000 System Identity This section contains general information about the switch. System Name, System Location, and System Contact are set in the SYSTEM > Name page. The Software Version changes when a new version of software is updated on the switch from the SYSTEM> Tools page. The Number of Ports, Hardware Version, and Serial Number values are created when the switch is manufactured and cannot be changed.
3Com Network Jack NJ2000 Trunk Information This table will be empty if no trunks have been configured from the TRUNKS > Membership page. The table has four columns as follows: Trunk - The Trunk Label. T1 through T4 may appear in this column.
3Com Network Jack NJ2000 Port Statistics You can display statistics on network traffic from the ports. These statistics can be used to identify potential problems with the switch (such as a faulty port or unusually heavy loading). All values displayed have been accumulated since the last system reboot, but can be reset to zero by clicking the CLEAR button.
3Com Network Jack NJ2000 Received Broadcast The number of packets, delivered by this sub-layer to a higher (sub-)layer, Packets which were addressed to a broadcast address at this sub-layer. The total number of octets transmitted out of the interface, including Transmitted Octets framing characters.
3Com Network Jack NJ2000 System Name This page allows you to change the System Name, System Location, and System Contact. The System Name is displayed on the Login page, and the SYSTEM > Information page. System Name - The name of the switch. The System Name can be up to 24 characters long.
3Com Network Jack NJ2000 IP Address This page allows you to change the IP Address used by the switch. DHCP Enabled - If enabled, the IP Address will be assigned from the DHCP server. If disabled, the IP Address must be assigned manually.
3Com Network Jack NJ2000 Password Settings This page allows you to change the password that is required to access this Web Management-Interface. You will need to enter the following: Current Password - The password that you used to login to this interface. There is no default password.
3Com Network Jack NJ2000 Tools On the Tools page, you can restore the switch to default settings, upgrade the firmware of the switch, or restart the switch. Restore to Factory Defaults Forces the switch to restore the original factory settings. To reset the switch, select “Reset to Factory Defaults”...
3Com Network Jack NJ2000 Upload/Download Configuration To upload or download the configuration file, select “Upload/Download Configuration” from the Tools drop-down list, then click “Upload” or “Download,” and then click on the “Browse” button to select the file. Restart Switch To restart the switch, select from the Tools drop-down list, and then click APPLY. The reset will be complete when the user interface displays the login page.
3Com Network Jack NJ2000 Port Configuration This page allows you to configure Jumbo Frames, Speed, Duplex and Flow Control settings for every port on the switch. Enable Jumbo Frames - Click box to enable jumbo frames. This setting is applied to all the ports on the switch.
3Com Network Jack NJ2000 Speed/Duplex The Speed and Duplex settings for the port are set by a single drop-down list. The possible values are: Auto - Speed and duplex settings are auto-negotiated. 10HDX - 10 Mbps, half-duplex 10FDX - 10 Mbps, full-duplex...
3Com Network Jack NJ2000 Storm Control This page allows you to set up a threshold for incoming broadcast and multicast packets. Too many incoming packets can severely cripple the switch and network performance. Rate limiting protects the switch and network by keeping the amount of data passing through the ports to a safe limit.
3Com Network Jack NJ2000 Port Mirroring This page allows you to copy (mirror) incoming and outgoing packets on multiple ports to a single port. This can be useful for diagnosing problems. The page is split into two sections: Port to Mirror to - Choose the destination port.
3Com Network Jack NJ2000 Port to Mirror to Select the destination port from the Port to Mirror to drop-down list. Any port can be selected. The tick-box of the selected port will be cleared and disabled (see the Ports to Mirror section).
3Com Network Jack NJ2000 Cable Diagnostics You can perform cable diagnostics for all ports or selected ports to diagnose any cable faults (short, open etc..) and feedback a distance to the fault. Cable Diagnostics – Cable diagnostics is performed on a per-port basis. Select the port number from the drop-down list.
3Com Network Jack NJ2000 Trunk Membership This page allows you to create a maximum of 4 trunks of up to 4 ports each. For instructions on how to create, modify, and delete trunks, please see Working with Trunks. The Membership Table has one row for each port and a column for each trunk, plus an additional column for ports that are not members of a trunk.
3Com Network Jack NJ2000 There are three main buttons associated with this page: HELP - Displays this window. APPLY - Updates the switch configuration. No changes are made to the configuration until this button is pressed. CANCEL - All changes made to the page are discarded and the switch configuration remains unchanged.
3Com Network Jack NJ2000 Trunk Setting This page allows you to change the Speed, Duplex and Flow Control settings for each trunk on the switch. The Trunk Setting Table has one row for each trunk and four columns. The columns are: Trunk - The Trunk Label.
3Com Network Jack NJ2000 LACP Setting This page allows you to configure LACP for each port. The switch supports both static trunking and dynamic Link Aggregation Control Protocol (LACP). LACP configured ports can automatically negotiate a trunked link with LACP-configured ports on another device. You can configure any number of ports on the switch as LACP, as long as they are not already configured as part of a static trunk.
3Com Network Jack NJ2000 LACP Status Overview This page displays the status of the LACP groups. The LACP Aggregation table has one row for each LACP group. Normal means no LACP group is active. For active LACP groups, a new row is created from which the status of its port members is displayed. Status of each port is indicated by a colored box, which use color and number to differentiate status.
3Com Network Jack NJ2000 Aggregation Information The following information is displayed for Link Aggregation Groups: Aggregation Group - Displays the ID number of the LACP group. Partner MAC Address - Displays the MAC address of a device in the LACP group that is attached to this switch.
3Com Network Jack NJ2000 802.1Q VLAN Membership This page allows you to create up to 64 VLANs. You can also delete the VLANs or make changes to the VLAN membership and behavior of individual ports. VLANs are powerful but can be difficult to set up properly. If you are...
3Com Network Jack NJ2000 Introduction to VLANs VLANs (or Virtual LANs) are logical partitions of the physical LAN. You can use VLANs to: Increase network performance Increase internal network security Create separate broadcast domains If the network has adequate performance and security for your current needs, it is recommended that you leave the VLAN settings in the default configuration.
3Com Network Jack NJ2000 Packet Type PCs should be connected to ports with Packet Type set to All. PCs cannot, in general, send or receive tagged packets. Switches should be connected to each other with Packet Type set to Tagged.
3Com Network Jack NJ2000 802.1Q VLAN Group After inputting a VLAN ID and clicking the ADD button on the VLAN Setup page, you will be directed to this page. This page allows you to select the ports to include as a member of the newly created VLAN.
3Com Network Jack NJ2000 802.1Q Per Port Configuration This page allows you to configure the VLAN parameters for individual ports. VLANs are powerful but can be difficult to set up properly. If you are unfamiliar with VLANs please see the VLANs.
3Com Network Jack NJ2000 802.1x Settings Network switches can provide open and easy access to network resources by simply attaching a client PC. Although this automatic configuration and access is a desirable feature, it also allows unauthorized personnel to easily intrude and possibly gain access to sensitive network data.
3Com Network Jack NJ2000 802.1x Settings The IEEE 802.1X standard defines a port-based access control procedure that prevents unauthorized access to a network by requiring users to first submit credentials for authentication. System Setting Mode - Indicates if 802.1X protocol is globally enabled or disabled on the switch.
3Com Network Jack NJ2000 802.1x Statistics Displays 802.1x statistics There are two main buttons associated with this page: HELP - Displays this window. REFRESH - Resends the information. Port Statistics - Statistics can be viewed on a per-port basis. Select the port that you want to view here.
3Com Network Jack NJ2000 LLDP Configuration This page allows you to setup the LLDP configuration. The LLDP State table contains a row for each port and two columns. The two columns are: Port - The front-panel port number. State - You can choose to disable or enable LLDP for each port. Enabling LLDP will allow the port to receive and transmit TLVs.
3Com Network Jack NJ2000 LLDP Neighbor Table This page displays the LLDP Neighbor Table, which provides information on neighboring devices. The table contains the following seven columns: Local Port - The local port of the switch. Chassis ID - The chassis information where the device is located.
3Com Network Jack NJ2000 RSTP Setting This page enables you to setup the configuration of RSTP. RSTP is a protocol that prevents loops in the network and dynamically reconfigures which physical links in a switch should forward frames. The page is composed of two tables: RSTP System Configuration - Configure global system settings.
3Com Network Jack NJ2000 STA Introduction The Spanning Tree Algorithm (STA) can be used to detect and disable network loops, and to provide backup links between switches, bridges or routers. This allows the switch to interact with other bridging devices (that is, an STA-compliant switch, bridge or router) in your network to ensure that only one route exists between any two stations on the network, and provide backup links which automatically take over when a primary link goes down.
3Com Network Jack NJ2000 RSTP status This page shows RSTP bridge and port states. There are two tables on this page: RSTP Bridge Overview - Show the RSTP settings for the whole switch. RSTP Port Status - Detailed RSTP information for each port.
3Com Network Jack NJ2000 QOS Configuration QoS (Quality of Service) is a mechanism which is used to prioritize certain traffic as it is moves through the switch. Traffic can be classified as High, Medium, Normal or Low priority. This switch features both strict priority-based and weighted round-robin (WRR) forwarding, with guaranteed bandwidth allocation for the different QOS classes.
3Com Network Jack NJ2000 There are three main buttons associated with this page: HELP - Displays this window. APPLY - Saves the settings to memory, and updates the configuration. No changes are made to the switch's configuration until this button is pressed.
3Com Network Jack NJ2000 SNMP Configuration This page allows you to configure the Simple Network Management Protocol (SNMP). The SNMP agent permits the switch to be managed from any system in the network using management software. You can set the following options: SNMP Enabled -Activate or deactivate SNMP.
The power source for the NJ2000 determines if PSE ethernet ports 1 and 2 can be used as 802.3af ports. If the NJ2000 uplink port (PD) is connected to a high-power midspan 802.3at POE device or the external 48VDC power adapter is being used, PSE ethernet ports 1 and 2 can be used as 802.3af ports, 15.4W power budget.
3Com Network Jack NJ2000 Each device (PD) that is connected to the PSE ethernet ports will have a PD class. This will limit the number of devices powered thru the PSE Ethernet ports 1 and 2. The NJ2000 can power: One class 0 or 3 PD or Two class 2 PD’s...
Power LEDs Indicate whether the NJ2000 is being powered by a local power supply (DC) or PoE. Uplink LED Indicates network connection status for the uplink port on the rear of the unit.