I bought the late in and used it all last year as an unmanaged switch. Thank you again for publicly posting this. I have no experience with linking these switches.
Basically you want to bridge the VLANs across the two switches, right? I would definitely run that one by Dell Support. Pingback: Dell 28xx series « Sysadmin Blog. Sounds like you may need to enable Spanning Tree Fast Link on the switch. We have a PowerConnect that was interrupted during the firmware update.
Obviously, I cannot get to it via the web gui. Any suggestions? Does the have a COM port? If you can connect with a COM cable, you might be able to see what it is doing. Great post, i finally got it into manage mode and i believe the firmware upgrade is going as we speak. The only thing i am confused about is it seems like my vlan 1 port is DOA, Is there a setting i am missing?
My suggestion would be to call Dell with your question. I did have to mess with spanning tree settings—see the link to another article at the bottom of the post above. Did any of you ever had trouble with symantec ghost multicast? Unicast through PC is very rapid. Anyone an idea?
Thanks heaps Mark. I thought i was going nuts setting it up via the documentation. Your explaination was very helpful. I have a switch. Dell support has been pretty helpful when I had questions—you might try calling them.
Dell PowerConnect switch can be configured for managed or unmanaged mode depending on your preference. By default, the switch is often in unmanaged mode. You can conform it by looking at the managed mode LED on the front panel. If the LED is green, it is in managed mode; if not, it is in unmanaged or secure mode.
This part will provide information about cables and physical connections for its copper and SFP interface respectively. VLANs are collections of switching ports that comprise a single broadcast domain.
Packets sharing common attributes can be grouped in the same VLAN. The PowerConnect 28xx switches support up to eight aggregated links. Each of the eight aggregated links may be defined with up to eight member ports to form a single Link Aggregated Group LAG. DHCP service is an on-going process. The BootP client is operational if there is a corrupted or invalid software image. The information replied is then used to provide the switch system with a TFTP server IP address and a download file name.
The switch can then configure these values to the TFTP client and try to download a valid runtime image. Switches exchange configuration messages using specifically formatted frames and selectively enable and disable forwarding on ports. STP can take up to seconds to converge. During this time, STP detects possible loops, allowing time for status changes to propagate and for relevant devices to respond.
The Fast Link option bypasses this delay, and can be used in network topologies where forwarding loops do not occur. Spanning Tree can take seconds for each host to decide whether its ports are actively forwarding traffic. Rapid Spanning Tree RSTP detects uses of network topologies to enable faster convergence, without creating forwarding loops. Root guard restricts the interface from functioning as the root port for the switch.
The PowerConnect 28xx system enables users to define various services for traffic classes of service. The underlying mechanism for supporting bandwidth management and control is based on the use of multiple priority queues for classifying traffic.
The switches support four queues per port. A CoS is defined by the user, whereby packets are related to the same Class of Service. After a packet has been classified, it is assigned to one of the queues. The IEEE No bandwidth reservations or limits are established or enforced. RMON defines current and historical MAC-layer statistics and control objects, allowing real-time information to be captured across the entire network. The system provides a means to collect the statistics defined in RMON and to view the results, using the Web management interface in the system.
The Gigabit Ethernet ports can operate at 10, or Mbps. These ports support autonegotiation, duplex mode Half or Full duplex , and flow control. The combo Mbps optical ports can only operate at Mbps, full-duplex mode. The following figures illustrate the front panels and back panels of the PowerConnect 28xx switches.
On the front panel there are eight ports which are numbered 1 to 8, top down and left to right. On the left side of the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode. The Power LED on the front panel indicates whether the device is powered on or not. A Mode push-button, located on the right side on the front panel is used to transition between management modes and to reset the device.
For more information about management modes and transitioning between them, see "Management Modes" on page On the front panel there are 16 ports which are numbered 1 to 16, top down and left to right. On each port there are LEDs to indicate the port status.
A Mode push-button, located on the right side on the front panel, is used to transition between management modes and to reset the device. On the front panel there are 24 ports which are numbered 1 to 24, top down and left to right.
The two combo ports are logical ports with two physical connections:. NOTE: Only one of the two physical connections of a combo port can be used at any one time. Port features and port controls are determined by the physical connection used. The system automatically detects the media used on a combo port, and utilizes the information in all the control interfaces. On the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode. On the front panel there are 48 ports, which are numbered 1 to 48, top down and left to right.
On each port, there are LEDs to indicate the port status. The four combo ports are logical ports with two physical connections:. On the top right side of the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode.
A Mode push-. Fans are provided on the side panel. The following figure illustrates the back panel of the PowerConnect device. The PowerConnect and PowerConnect switches have the following physical dimensions:. The front panel contains LEDs that indicate the status of links, power supply, fan status, and Managed Mode status.
On the PowerConnect 28xx front panel there is a Managed Mode LED monitoring the switch node as well as indicating diagnostic test results. Indicates diagnostics in progress, firmware loading, or Management Mode transition. The following table describes the fan status LED indications.
The PowerConnect 28xx has a Mode push button on the front panel. To transition between modes, press the button normally. To reset the device, press and hold the button for at least 7 seconds.
The PowerConnect switch has three fans and the PowerConnect switch has one fan for system ventilation. The PowerConnect and PowerConnect devices have no internal fans. This section explains the switch physical interfaces, and provides information about cables and port connections. Copper cable diagnostics are supported. High-speed workstations, hubs, routers, or other switches are connected through standard RJ connectors to the switch physical interface ports, located on the front panel.
However, it is recommended that enhanced Category 5 Category 5e cable is used for all critical connections or any new cable installations. The Category 5e specification includes test parameters that are only recommendations for Category 5, and comply with the IEEE Only one of the two physical connections of a combo port can be used at any time.
The system automatically detects the media used on a combo port, and utilizes this information in the control interfaces. PowerConnect switch supports SFP diagnostics. The optical transceiver provides access to a set of parameters that can be monitored and displayed to the system administrator. The PowerConnect 28xx supports a single internal power supply to provide power for switching operations.
The internal power supply supports input voltages between and VAC. The AC power connector is located on the back panel of the switch. This section contains information about device unpacking, location, installation, and cable connections. Do not service any device except as explained in the system documentation. Opening or removing covers marked with a triangular symbol with a lighting bolt may cause electrical shock.
These components are to be serviced by trained service technicians only. To determine the possibility of overloading the supply circuits, add together the ampere ratings of all switches installed on the same circuit as the device. Compare this total with the rating limit for the circuit. The PowerConnect 28xx can be mounted in a standard equipment rack, placed on a tabletop, or mounted on the wall.
Before installing the device, verify that the site selected for the device meets the following site requirements:. If the device has two power supplies, the site should have two power outlets with different power feeders. Allow clearance for cabling, power connections, and ventilation. Verify that water or moisture cannot enter the device case. NOTE: Before unpacking the device, inspect the packaging and report any evidence of damage. Report any damage immediately.
The following figure illustrates where to mount the brackets. Fasten the lower pair of screws before the upper pair of screws. Ensure that the ventilation holes are not obstructed. The device must be installed on a flat surface if it is not installed on a rack. The surface must be able to support the weight of the device and the device cables. Standard straight-through twisted-pair cables can be used to connect to any other Ethernet network systems, servers, switches or routers that supports auto-negotiation.
This will damage the Ethernet device. NOTE: If auto negotiation is turned off on the ports, a straight through cable must be used. As each connection is made, the link LED corresponding to each port on the device is illuminated green or amber indicating that the connection is valid.
The console port enables a connection to a terminal desktop system running terminal emulation software for monitoring and configuring the device. Ensure that the setting is for Terminal keys not Windows keys.
Go to www. The Console port is located on the back panel. Connect the device to a power source in the steps detailed in Starting and Configuring the Device. Connector types, ports and cables are summarized in Ports, Connectors, and Cables. Copper Cable and Optical Transceiver Diagnostics are supported.
To establish a link for the twisted-pair ports, Tx pair on one cable end must be connected to the Rx pair on the other cable end, and vice versa. If the cabling is done such that Tx on one end is wired to Tx on the other end, and Rx is wired to Rx, a link is not established. When selecting cables to connect the device ports to their networking peers, straight through cables must be used to connect the device to a station, and crossover cables must be used to connect one transmission device switch or hub to another.
Both the straight through and crossover cables are category 5. The general information for configuring the device ports includes the short description of the autonegotiation mechanism and the default settings for switching ports. Auto-negotiation is enabled per port by default.
Auto-negotiation is a mechanism established between two link partners to enable a port to advertise its transmission rate, duplex mode and flow control the flow control by default is enabled abilities to its partner. The ports then both operate at the highest common denominator between them. If connecting a NIC that does not support auto-negotiation or is not set to auto-negotiation, both the device switching port and the NIC must be manually set to the same speed and duplex mode.
The feature is part of the Auto-negotiation and is enabled when Auto-negotiation is enabled. The device supports By default, this feature is enabled. It can be enabled per port. The flow control mechanism allows the receiving side to signal to the transmitting side that transmission must temporarily be halted to prevent buffer overflow. The device supports back pressure for ports configured to half duplex mode.
By default, this feature is disabled. The back pressure mechanism prevents the transmitting side from transmitting additional traffic temporarily.
The receiving side may occupy a link so it becomes unavailable for additional traffic. After completing all external connections, the device must be configured. This section describes various methods of configuring the device. NOTE: Before proceeding, read the release notes for this product. NOTE: If the device is to be used as an unmanaged switch, there is no need for a terminal connection.
A terminal connection is only required if the device is to be used in Managed mode. See "Management Modes" on page 40 for a description of these modes.
Figure provides an overview of the device initialization process. This section covers the following topics:. The device can be run in Managed or Unmanaged mode. By default, the device is in Unmanaged mode. These modes are described below:. All modes are maintained throughout power cycles. Figure shows the transition between Managed, Secure and Unmanaged operating modes:. There is no management interface available in Secure or Unmanaged mode to enable the user to modify, save or restore configurations.
After the system is in Secure mode, it retains its last running configuration, but does not have a management IP address cannot be managed from the web interface. This page can be used to retrieve a saved configuration. You can also change the device IP address using the following page:. When restoring a saved configuration, this option uses the IP address, user name and password inside the saved configuration.
The procedure described in this section refers to the device when set to Managed mode. See Figure for a description of how to enter the Managed mode.
In managed mode, the boot procedure can be monitored on the connected terminal as follows:. POST runs every time the device is initialized and checks hardware components to determine if the device is fully operational before completely booting. If a critical problem is detected, the program flow stops. POST messages are displayed on the terminal and indicate test success or failure.
To set the switch to Managed mode, press the Mode button for up to 7 seconds. NOTE: The initial simple configuration uses the following assumptions:. The system prompts you to use the Set-up wizard when the device boots up for the first time or if the configuration file is empty. The Setup Wizard provides guidance through the initial device configuration, and gets the device up and running as quickly as possible.
NOTE: Obtain the following information from your network administrator before configuring the device:. The Setup Wizard guides you through the initial switch configuration, and gets you up and running as quickly as possible. You can skip the setup wizard, and enter CLI mode to manually configure the switch. The system will prompt you with a default answer; by pressing enter, you accept the default.
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