If you’ve shopped for network equipment lately, you’ve most likely noticed that many new network devices are now available with dual Ethernet ports. While the presence of an additional Ethernet port can obviously serve to improve the reliability of communication with critical network elements, many network users often are unaware of other advantages that can potentially be provided by a dual Ethernet device.
Although there are literally dozens of possible uses for dual Ethernet capabilities in small office and home office applications, this article will focus mainly on common applications for dual Ethernet in the IT industry. When dual Ethernet devices are deployed in a large data center or network equipment facility, the most popular applications are as follows:
- Network Failover - Provides network failover/fallback capabilities to ensure that critical network elements will still be accessible in the event that the primary network fails
- Network Redundancy - Allows communication with the dual Ethernet device via both a production network and a maintenance network, thereby reducing traffic/load on your production network and providing two separate avenues by which the device can be accessed
- Access via Cell Network - Enables administrators to communicate with a remote network element via cell network (providing that a router and 3G/4G modem have been installed at one of the Ethernet ports)
Network Failover Applications
In IT industry applications, the most commonly encountered implementation for dual Ethernet devices is to provide automatic failover/fallback capabilities for critical network elements. In this case, a dual Ethernet device such as a WTI DSM-40-E Console Server is connected to both a primary network connection and a secondary network connection; the same IP addresses and other network protocol are then assigned to each of the two available Ethernet ports. If either network connection fails or becomes temporarily unavailable, this allows the dual Ethernet console server to automatically fallback to the other Ethernet port, ensuring that the device is always accessible when needed; even when the primary network is not available.
For example, if your network includes a console server or terminal server in order to allow console port access to maintenance and configuration functions on various devices within your network, it’s important that the console server is always available; especially in the event that network communication problems arise. A Dual Ethernet console server can be connected to both the primary network and secondary network in order to provide an alternate route to command functions when the primary network is down, ensuring that critical command and configuration capabilities are available when they’re needed the most. This means that when the primary network fails, the Dual Ethernet console server will automatically, seamlessly switch over to the secondary network, allowing technicians to access the console server and then communicate with various connected remote devices via the secondary network in order to check status, change configuration parameters or attempt to rectify the problem that caused the primary network to fail in the first place.
Network Redundancy Applications
In a network redundancy application, a dual Ethernet device is connected to two separate networks in order to reduce traffic or load on one of these networks. This capability can be extremely handy in any case where two networks are present and there is a need to reserve one of those networks for maintenance and service functions. Typically, a network redundancy application will include both a production network that is generally employed by only end users and a maintenance network that is primarily used for configuration purposes, firmware upgrades and other network maintenance related tasks.
In Network Redundancy applications, each of the two available Ethernet ports on the dual Ethernet unit is connected to a separate network, and unique IP addresses are assigned to each Ethernet port. This effectively allows users on both networks to easily access the dual Ethernet device in order to communicate with devices on either of the two networks.
This type of network configuration provides end users with prompt access to various devices and services on the production network while simultaneously providing technicians and service personnel with a maintenance network which allows them to upload firmware, diagnose problems with network elements and tweak configuration parameters without overburdening or slowing the production network.
In this case, a network element such as a WTI DSM-40-E Dual Ethernet Console Server can be connected to both the production network and maintenance network in order to provide end users with access to various devices on the production network, while also allowing network techs to access these devices in order to reboot unresponsive units or access console port functions on remote units without putting undue load on the production network.
Cell Network Access Applications
As land-line phone applications continue to rapidly disappear and VOIP becomes more and more prevalent, the need to communicate with critical network elements via cell network has also grown. Dual Ethernet capabilities enable network administrators to install a router and 3G/4G cell modem at the secondary Ethernet port on their DSM-40-E Console Server in order to provide cell network accessibility without sacrificing network communication or devoting a valuable serial port for cell modem installation.
In this type of application, the primary Ethernet port supports direct network access to the dual Ethernet console server, while the secondary Ethernet port is used to host a router and 3G/4G cell modem. This provides cell network users with secure, reliable out-of-band communication with the dual Ethernet console server (as well as other devices on the network,) preserves the ability to communicate via normal Ethernet connection and avoids the need to forfeit a much-needed serial console port for cell modem installation.
In addition to providing cell network access to the dual Ethernet console server, some users have alternatively employed the second Ethernet port to host an Iridium satellite modem. In situations where equipment location does not provide easy access to a land line or cell tower signal, an Iridium satellite modem often provides the only practical means to establish an out-of-band access to console server functions.
Dual Ethernet Console Server Application with Enterprise Management Software
In out-of-band management applications that require communication with a large number of console server units spread across an extensive network, the task of finding the desired console server unit can often pose a challenge. WTI WMU Enterprise Management Software can simplify this process by providing administrators with a single, centralized interface that can be used to quickly find and address specific console servers within the network.
The Enterprise Management Software allows administrators to identify each individual DSM-40-E unit on the network, organize units into groups based on location or functionality and quickly invoke console port command functions on network elements that are connected to the console server. In addition to providing quick access to console port command functions, the Enterprise Management Software also enables administrators to perform firmware updates and manage passwords for multiple or individual WTI units.
Although the examples discussed here probably represent the most commonly encountered applications for dual Ethernet capabilities in an IT environment, there are also dozens of other possible applications for dual Ethernet units that differ from one industry segment to the next. In the near future creative IT professionals will inevitably find many other innovative ways to employ dual Ethernet network devices in a corporate network environment in order to cut costs, simplify communication and add functionality and flexibility for their network users.